eq_x_params_t Struct Reference

#include <rc5-eq.hh>

Data Fields
pair_t	cp_pair
WORD_T	dx
WORD_T	y
WORD_T	yy
uint32_t	rot_const
uint32_t	rot_const_prev
bool	b_aux_data
uint64_t	nvariants

Detailed Description

Parameters for the last round equation in x: (y - x) = (y - (x ^ dx))

The Boolean variable b_aux_data indicated the presence of auxiliray data such as e.g. the values of the rotation constants from this and the previous rounds resp. rot_const_prev and rot_const . If the latter are known then the following log2(w) bits of x can be computed, where w is the word size in bits:

x[(rot_const + log2(w)) : rot_const] = (rot_const_prev ^ rot_const).

Example: x[(r6 + 5) : r6] = (r6 ^ r7) = (X[6] & 0x1F) ^ (X[7] & 0x1F).

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

• include/rc5-eq.hh