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/home/tahkoom/public_html/wp-includes/sodium_compat/src/Core/AES.php
<?php
if (class_exists('ParagonIE_Sodium_Core_AES', false)) {
return;
}
/**
* Bitsliced implementation of the AES block cipher.
*
* Based on the implementation provided by BearSSL.
*
* @internal This should only be used by sodium_compat
*/
class ParagonIE_Sodium_Core_AES extends ParagonIE_Sodium_Core_Util
{
/**
* @var int[] AES round constants
*/
private static $Rcon = array(
0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1B, 0x36
);
/**
* Mutates the values of $q!
*
* @param ParagonIE_Sodium_Core_AES_Block $q
* @return void
*/
public static function sbox(ParagonIE_Sodium_Core_AES_Block $q)
{
/**
* @var int $x0
* @var int $x1
* @var int $x2
* @var int $x3
* @var int $x4
* @var int $x5
* @var int $x6
* @var int $x7
*/
$x0 = $q[7] & self::U32_MAX;
$x1 = $q[6] & self::U32_MAX;
$x2 = $q[5] & self::U32_MAX;
$x3 = $q[4] & self::U32_MAX;
$x4 = $q[3] & self::U32_MAX;
$x5 = $q[2] & self::U32_MAX;
$x6 = $q[1] & self::U32_MAX;
$x7 = $q[0] & self::U32_MAX;
$y14 = $x3 ^ $x5;
$y13 = $x0 ^ $x6;
$y9 = $x0 ^ $x3;
$y8 = $x0 ^ $x5;
$t0 = $x1 ^ $x2;
$y1 = $t0 ^ $x7;
$y4 = $y1 ^ $x3;
$y12 = $y13 ^ $y14;
$y2 = $y1 ^ $x0;
$y5 = $y1 ^ $x6;
$y3 = $y5 ^ $y8;
$t1 = $x4 ^ $y12;
$y15 = $t1 ^ $x5;
$y20 = $t1 ^ $x1;
$y6 = $y15 ^ $x7;
$y10 = $y15 ^ $t0;
$y11 = $y20 ^ $y9;
$y7 = $x7 ^ $y11;
$y17 = $y10 ^ $y11;
$y19 = $y10 ^ $y8;
$y16 = $t0 ^ $y11;
$y21 = $y13 ^ $y16;
$y18 = $x0 ^ $y16;
/*
* Non-linear section.
*/
$t2 = $y12 & $y15;
$t3 = $y3 & $y6;
$t4 = $t3 ^ $t2;
$t5 = $y4 & $x7;
$t6 = $t5 ^ $t2;
$t7 = $y13 & $y16;
$t8 = $y5 & $y1;
$t9 = $t8 ^ $t7;
$t10 = $y2 & $y7;
$t11 = $t10 ^ $t7;
$t12 = $y9 & $y11;
$t13 = $y14 & $y17;
$t14 = $t13 ^ $t12;
$t15 = $y8 & $y10;
$t16 = $t15 ^ $t12;
$t17 = $t4 ^ $t14;
$t18 = $t6 ^ $t16;
$t19 = $t9 ^ $t14;
$t20 = $t11 ^ $t16;
$t21 = $t17 ^ $y20;
$t22 = $t18 ^ $y19;
$t23 = $t19 ^ $y21;
$t24 = $t20 ^ $y18;
$t25 = $t21 ^ $t22;
$t26 = $t21 & $t23;
$t27 = $t24 ^ $t26;
$t28 = $t25 & $t27;
$t29 = $t28 ^ $t22;
$t30 = $t23 ^ $t24;
$t31 = $t22 ^ $t26;
$t32 = $t31 & $t30;
$t33 = $t32 ^ $t24;
$t34 = $t23 ^ $t33;
$t35 = $t27 ^ $t33;
$t36 = $t24 & $t35;
$t37 = $t36 ^ $t34;
$t38 = $t27 ^ $t36;
$t39 = $t29 & $t38;
$t40 = $t25 ^ $t39;
$t41 = $t40 ^ $t37;
$t42 = $t29 ^ $t33;
$t43 = $t29 ^ $t40;
$t44 = $t33 ^ $t37;
$t45 = $t42 ^ $t41;
$z0 = $t44 & $y15;
$z1 = $t37 & $y6;
$z2 = $t33 & $x7;
$z3 = $t43 & $y16;
$z4 = $t40 & $y1;
$z5 = $t29 & $y7;
$z6 = $t42 & $y11;
$z7 = $t45 & $y17;
$z8 = $t41 & $y10;
$z9 = $t44 & $y12;
$z10 = $t37 & $y3;
$z11 = $t33 & $y4;
$z12 = $t43 & $y13;
$z13 = $t40 & $y5;
$z14 = $t29 & $y2;
$z15 = $t42 & $y9;
$z16 = $t45 & $y14;
$z17 = $t41 & $y8;
/*
* Bottom linear transformation.
*/
$t46 = $z15 ^ $z16;
$t47 = $z10 ^ $z11;
$t48 = $z5 ^ $z13;
$t49 = $z9 ^ $z10;
$t50 = $z2 ^ $z12;
$t51 = $z2 ^ $z5;
$t52 = $z7 ^ $z8;
$t53 = $z0 ^ $z3;
$t54 = $z6 ^ $z7;
$t55 = $z16 ^ $z17;
$t56 = $z12 ^ $t48;
$t57 = $t50 ^ $t53;
$t58 = $z4 ^ $t46;
$t59 = $z3 ^ $t54;
$t60 = $t46 ^ $t57;
$t61 = $z14 ^ $t57;
$t62 = $t52 ^ $t58;
$t63 = $t49 ^ $t58;
$t64 = $z4 ^ $t59;
$t65 = $t61 ^ $t62;
$t66 = $z1 ^ $t63;
$s0 = $t59 ^ $t63;
$s6 = $t56 ^ ~$t62;
$s7 = $t48 ^ ~$t60;
$t67 = $t64 ^ $t65;
$s3 = $t53 ^ $t66;
$s4 = $t51 ^ $t66;
$s5 = $t47 ^ $t65;
$s1 = $t64 ^ ~$s3;
$s2 = $t55 ^ ~$t67;
$q[7] = $s0 & self::U32_MAX;
$q[6] = $s1 & self::U32_MAX;
$q[5] = $s2 & self::U32_MAX;
$q[4] = $s3 & self::U32_MAX;
$q[3] = $s4 & self::U32_MAX;
$q[2] = $s5 & self::U32_MAX;
$q[1] = $s6 & self::U32_MAX;
$q[0] = $s7 & self::U32_MAX;
}
/**
* Mutates the values of $q!
*
* @param ParagonIE_Sodium_Core_AES_Block $q
* @return void
*/
public static function invSbox(ParagonIE_Sodium_Core_AES_Block $q)
{
self::processInversion($q);
self::sbox($q);
self::processInversion($q);
}
/**
* This is some boilerplate code needed to invert an S-box. Rather than repeat the code
* twice, I moved it to a protected method.
*
* Mutates $q
*
* @param ParagonIE_Sodium_Core_AES_Block $q
* @return void
*/
protected static function processInversion(ParagonIE_Sodium_Core_AES_Block $q)
{
$q0 = (~$q[0]) & self::U32_MAX;
$q1 = (~$q[1]) & self::U32_MAX;
$q2 = $q[2] & self::U32_MAX;
$q3 = $q[3] & self::U32_MAX;
$q4 = $q[4] & self::U32_MAX;
$q5 = (~$q[5]) & self::U32_MAX;
$q6 = (~$q[6]) & self::U32_MAX;
$q7 = $q[7] & self::U32_MAX;
$q[7] = ($q1 ^ $q4 ^ $q6) & self::U32_MAX;
$q[6] = ($q0 ^ $q3 ^ $q5) & self::U32_MAX;
$q[5] = ($q7 ^ $q2 ^ $q4) & self::U32_MAX;
$q[4] = ($q6 ^ $q1 ^ $q3) & self::U32_MAX;
$q[3] = ($q5 ^ $q0 ^ $q2) & self::U32_MAX;
$q[2] = ($q4 ^ $q7 ^ $q1) & self::U32_MAX;
$q[1] = ($q3 ^ $q6 ^ $q0) & self::U32_MAX;
$q[0] = ($q2 ^ $q5 ^ $q7) & self::U32_MAX;
}
/**
* @param int $x
* @return int
*/
public static function subWord($x)
{
$q = ParagonIE_Sodium_Core_AES_Block::fromArray(
array($x, $x, $x, $x, $x, $x, $x, $x)
);
$q->orthogonalize();
self::sbox($q);
$q->orthogonalize();
return $q[0] & self::U32_MAX;
}
/**
* Calculate the key schedule from a given random key
*
* @param string $key
* @return ParagonIE_Sodium_Core_AES_KeySchedule
* @throws SodiumException
*/
public static function keySchedule($key)
{
$key_len = self::strlen($key);
switch ($key_len) {
case 16:
$num_rounds = 10;
break;
case 24:
$num_rounds = 12;
break;
case 32:
$num_rounds = 14;
break;
default:
throw new SodiumException('Invalid key length: ' . $key_len);
}
$skey = array();
$comp_skey = array();
$nk = $key_len >> 2;
$nkf = ($num_rounds + 1) << 2;
$tmp = 0;
for ($i = 0; $i < $nk; ++$i) {
$tmp = self::load_4(self::substr($key, $i << 2, 4));
$skey[($i << 1)] = $tmp;
$skey[($i << 1) + 1] = $tmp;
}
for ($i = $nk, $j = 0, $k = 0; $i < $nkf; ++$i) {
if ($j === 0) {
$tmp = (($tmp & 0xff) << 24) | ($tmp >> 8);
$tmp = (self::subWord($tmp) ^ self::$Rcon[$k]) & self::U32_MAX;
} elseif ($nk > 6 && $j === 4) {
$tmp = self::subWord($tmp);
}
$tmp ^= $skey[($i - $nk) << 1];
$skey[($i << 1)] = $tmp & self::U32_MAX;
$skey[($i << 1) + 1] = $tmp & self::U32_MAX;
if (++$j === $nk) {
/** @psalm-suppress LoopInvalidation */
$j = 0;
++$k;
}
}
for ($i = 0; $i < $nkf; $i += 4) {
$q = ParagonIE_Sodium_Core_AES_Block::fromArray(
array_slice($skey, $i << 1, 8)
);
$q->orthogonalize();
// We have to overwrite $skey since we're not using C pointers like BearSSL did
for ($j = 0; $j < 8; ++$j) {
$skey[($i << 1) + $j] = $q[$j];
}
}
for ($i = 0, $j = 0; $i < $nkf; ++$i, $j += 2) {
$comp_skey[$i] = ($skey[$j] & 0x55555555)
| ($skey[$j + 1] & 0xAAAAAAAA);
}
return new ParagonIE_Sodium_Core_AES_KeySchedule($comp_skey, $num_rounds);
}
/**
* Mutates $q
*
* @param ParagonIE_Sodium_Core_AES_KeySchedule $skey
* @param ParagonIE_Sodium_Core_AES_Block $q
* @param int $offset
* @return void
*/
public static function addRoundKey(
ParagonIE_Sodium_Core_AES_Block $q,
ParagonIE_Sodium_Core_AES_KeySchedule $skey,
$offset = 0
) {
$block = $skey->getRoundKey($offset);
for ($j = 0; $j < 8; ++$j) {
$q[$j] = ($q[$j] ^ $block[$j]) & ParagonIE_Sodium_Core_Util::U32_MAX;
}
}
/**
* This mainly exists for testing, as we need the round key features for AEGIS.
*
* @param string $message
* @param string $key
* @return string
* @throws SodiumException
*/
public static function decryptBlockECB($message, $key)
{
if (self::strlen($message) !== 16) {
throw new SodiumException('decryptBlockECB() expects a 16 byte message');
}
$skey = self::keySchedule($key)->expand();
$q = ParagonIE_Sodium_Core_AES_Block::init();
$q[0] = self::load_4(self::substr($message, 0, 4));
$q[2] = self::load_4(self::substr($message, 4, 4));
$q[4] = self::load_4(self::substr($message, 8, 4));
$q[6] = self::load_4(self::substr($message, 12, 4));
$q->orthogonalize();
self::bitsliceDecryptBlock($skey, $q);
$q->orthogonalize();
return self::store32_le($q[0]) .
self::store32_le($q[2]) .
self::store32_le($q[4]) .
self::store32_le($q[6]);
}
/**
* This mainly exists for testing, as we need the round key features for AEGIS.
*
* @param string $message
* @param string $key
* @return string
* @throws SodiumException
*/
public static function encryptBlockECB($message, $key)
{
if (self::strlen($message) !== 16) {
throw new SodiumException('encryptBlockECB() expects a 16 byte message');
}
$comp_skey = self::keySchedule($key);
$skey = $comp_skey->expand();
$q = ParagonIE_Sodium_Core_AES_Block::init();
$q[0] = self::load_4(self::substr($message, 0, 4));
$q[2] = self::load_4(self::substr($message, 4, 4));
$q[4] = self::load_4(self::substr($message, 8, 4));
$q[6] = self::load_4(self::substr($message, 12, 4));
$q->orthogonalize();
self::bitsliceEncryptBlock($skey, $q);
$q->orthogonalize();
return self::store32_le($q[0]) .
self::store32_le($q[2]) .
self::store32_le($q[4]) .
self::store32_le($q[6]);
}
/**
* Mutates $q
*
* @param ParagonIE_Sodium_Core_AES_Expanded $skey
* @param ParagonIE_Sodium_Core_AES_Block $q
* @return void
*/
public static function bitsliceEncryptBlock(
ParagonIE_Sodium_Core_AES_Expanded $skey,
ParagonIE_Sodium_Core_AES_Block $q
) {
self::addRoundKey($q, $skey);
for ($u = 1; $u < $skey->getNumRounds(); ++$u) {
self::sbox($q);
$q->shiftRows();
$q->mixColumns();
self::addRoundKey($q, $skey, ($u << 3));
}
self::sbox($q);
$q->shiftRows();
self::addRoundKey($q, $skey, ($skey->getNumRounds() << 3));
}
/**
* @param string $x
* @param string $y
* @return string
*/
public static function aesRound($x, $y)
{
$q = ParagonIE_Sodium_Core_AES_Block::init();
$q[0] = self::load_4(self::substr($x, 0, 4));
$q[2] = self::load_4(self::substr($x, 4, 4));
$q[4] = self::load_4(self::substr($x, 8, 4));
$q[6] = self::load_4(self::substr($x, 12, 4));
$rk = ParagonIE_Sodium_Core_AES_Block::init();
$rk[0] = $rk[1] = self::load_4(self::substr($y, 0, 4));
$rk[2] = $rk[3] = self::load_4(self::substr($y, 4, 4));
$rk[4] = $rk[5] = self::load_4(self::substr($y, 8, 4));
$rk[6] = $rk[7] = self::load_4(self::substr($y, 12, 4));
$q->orthogonalize();
self::sbox($q);
$q->shiftRows();
$q->mixColumns();
$q->orthogonalize();
// add round key without key schedule:
for ($i = 0; $i < 8; ++$i) {
$q[$i] ^= $rk[$i];
}
return self::store32_le($q[0]) .
self::store32_le($q[2]) .
self::store32_le($q[4]) .
self::store32_le($q[6]);
}
/**
* Process two AES blocks in one shot.
*
* @param string $b0 First AES block
* @param string $rk0 First round key
* @param string $b1 Second AES block
* @param string $rk1 Second round key
* @return string[]
*/
public static function doubleRound($b0, $rk0, $b1, $rk1)
{
$q = ParagonIE_Sodium_Core_AES_Block::init();
// First block
$q[0] = self::load_4(self::substr($b0, 0, 4));
$q[2] = self::load_4(self::substr($b0, 4, 4));
$q[4] = self::load_4(self::substr($b0, 8, 4));
$q[6] = self::load_4(self::substr($b0, 12, 4));
// Second block
$q[1] = self::load_4(self::substr($b1, 0, 4));
$q[3] = self::load_4(self::substr($b1, 4, 4));
$q[5] = self::load_4(self::substr($b1, 8, 4));
$q[7] = self::load_4(self::substr($b1, 12, 4));;
$rk = ParagonIE_Sodium_Core_AES_Block::init();
// First round key
$rk[0] = self::load_4(self::substr($rk0, 0, 4));
$rk[2] = self::load_4(self::substr($rk0, 4, 4));
$rk[4] = self::load_4(self::substr($rk0, 8, 4));
$rk[6] = self::load_4(self::substr($rk0, 12, 4));
// Second round key
$rk[1] = self::load_4(self::substr($rk1, 0, 4));
$rk[3] = self::load_4(self::substr($rk1, 4, 4));
$rk[5] = self::load_4(self::substr($rk1, 8, 4));
$rk[7] = self::load_4(self::substr($rk1, 12, 4));
$q->orthogonalize();
self::sbox($q);
$q->shiftRows();
$q->mixColumns();
$q->orthogonalize();
// add round key without key schedule:
for ($i = 0; $i < 8; ++$i) {
$q[$i] ^= $rk[$i];
}
return array(
self::store32_le($q[0]) . self::store32_le($q[2]) . self::store32_le($q[4]) . self::store32_le($q[6]),
self::store32_le($q[1]) . self::store32_le($q[3]) . self::store32_le($q[5]) . self::store32_le($q[7]),
);
}
/**
* @param ParagonIE_Sodium_Core_AES_Expanded $skey
* @param ParagonIE_Sodium_Core_AES_Block $q
* @return void
*/
public static function bitsliceDecryptBlock(
ParagonIE_Sodium_Core_AES_Expanded $skey,
ParagonIE_Sodium_Core_AES_Block $q
) {
self::addRoundKey($q, $skey, ($skey->getNumRounds() << 3));
for ($u = $skey->getNumRounds() - 1; $u > 0; --$u) {
$q->inverseShiftRows();
self::invSbox($q);
self::addRoundKey($q, $skey, ($u << 3));
$q->inverseMixColumns();
}
$q->inverseShiftRows();
self::invSbox($q);
self::addRoundKey($q, $skey, ($u << 3));
}
}
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