ParagonIE_Sodium_Core_AES::aesRound( string $x, string $y ): string

419    public static function aesRound($x, $y)420    {421        $q = ParagonIE_Sodium_Core_AES_Block::init();422        $q[0] = self::load_4(self::substr($x, 0, 4));423        $q[2] = self::load_4(self::substr($x, 4, 4));424        $q[4] = self::load_4(self::substr($x, 8, 4));425        $q[6] = self::load_4(self::substr($x, 12, 4));426 427        $rk = ParagonIE_Sodium_Core_AES_Block::init();428        $rk[0] = $rk[1] = self::load_4(self::substr($y, 0, 4));429        $rk[2] = $rk[3] = self::load_4(self::substr($y, 4, 4));430        $rk[4] = $rk[5] = self::load_4(self::substr($y, 8, 4));431        $rk[6] = $rk[7] = self::load_4(self::substr($y, 12, 4));432 433        $q->orthogonalize();434        self::sbox($q);435        $q->shiftRows();436        $q->mixColumns();437        $q->orthogonalize();438        // add round key without key schedule:439        for ($i = 0; $i < 8; ++$i) {440            $q[$i] ^= $rk[$i];441        }442        return self::store32_le($q[0]) .443            self::store32_le($q[2]) .444            self::store32_le($q[4]) .445            self::store32_le($q[6]);446    }