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<?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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