AESMath Class Reference

Class providing some mathematical functions needed for AES. More...

#include <aesMath.h>

Collaboration diagram for AESMath:

Static Public Member Functions
static void	reverseArray (uint8_t arr[], uint8_t low, uint8_t high)
	Reverse an array by swapping the lowest and highest element.
static void	swap (uint8_t &a, uint8_t &b)
	Swap the values of 2 integers.
static void	rightRotateArray (uint8_t arr[], uint8_t n, uint8_t k)
	Rotate an array arr of length n by k to the right.
static uint8_t	ffMul (uint8_t x, uint8_t y)
	Multiply x and y in GF(2^8) Implemented after https://en.wikipedia.org/wiki/Finite_field_arithmetic.

Private Member Functions
	AESMath ()=default
	Construct a new AESMath object.

Static Private Attributes
static constexpr uint8_t	IRREDUCIBLE_POLYNOMIAL = 0x1B
	Irreducible polynomial: x^8 + x^4 + x^3 + x + 1.

Detailed Description

Class providing some mathematical functions needed for AES.

Authors

Philipp Karg (phili.nosp@m.pp.k.nosp@m.arg@t.nosp@m.um.d.nosp@m.e)

Date

02.07.2022

Copyright

Philipp Karg 2022

Member Function Documentation

ffMul()

static uint8_t AESMath::ffMul ( uint8_t  x, uint8_t  y  )

static

Multiply x and y in GF(2^8) Implemented after https://en.wikipedia.org/wiki/Finite_field_arithmetic.

Parameters

[in]	x	(uint8_t): Left parameter to multiply.
[in]	y	(uint8_t): Right parameter to multiply.

Returns

(uint8_t): The result of the Finite-Field multiplication.

reverseArray()

static void AESMath::reverseArray ( uint8_t  arr[], uint8_t  low, uint8_t  high  )

static

Reverse an array by swapping the lowest and highest element.

Parameters

[in,out]	arr	(uint8_t[]): Array to reverse.
[in]	low	(uint8_t): Index of the lowest element.
[in]	high	(uint8_t): Index of the highest element.

rightRotateArray()

static void AESMath::rightRotateArray ( uint8_t  arr[], uint8_t  n, uint8_t  k  )

static

Rotate an array arr of length n by k to the right.

Parameters

[in]	arr	(uint8_t*): Array to rotate.
[in]	n	(uint8_t): Length of the array.
[in]	k	(uint8_t): Amount to rotate.

swap()

static void AESMath::swap ( uint8_t &  a, uint8_t &  b  )

static

Swap the values of 2 integers.

Parameters

[in,out]	a	(uint8_t): First element to swap.
[in,out]	b	(uint8_t): Second element to swap.

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The documentation for this class was generated from the following file:

• aesMath.h