simon.cc File Reference

Analysis of block cipher Simon [ePrint 2013/404]. More...

#include "common.hh"
#include "xdp-rot-and.hh"
#include "simon.hh"

Functions
uint32_t	simon_compute_nkeywords (uint32_t word_size, uint32_t key_size)
uint32_t	simon_get_keysize (uint32_t word_size)
uint32_t	simon_compute_nrounds (uint32_t word_size, uint32_t nkey_words, uint32_t *zseq_j)
void	simon_key_expansion (uint32_t key[SIMON_MAX_NROUNDS], uint32_t Z[5][62], uint32_t zseq_j, uint32_t nrounds, uint32_t nkey_words)
void	simon_encrypt (uint32_t key[SIMON_MAX_NROUNDS], uint32_t nrounds, uint32_t *x_in, uint32_t *y_in)
void	simon_diff_graph_check_edge (std::vector< simon_diff_graph_edge_t > *E, const simon_diff_graph_edge_t new_edge)
void	simon_encrypt_pairs (uint32_t key[SIMON_MAX_NROUNDS], uint32_t nrounds, uint32_t *x_in, uint32_t *y_in, uint32_t *xx_in, uint32_t *yy_in, std::vector< simon_diff_graph_edge_t > *E)

Variables
uint32_t	g_simon_zseq [5][62]

Detailed Description

Analysis of block cipher Simon [ePrint 2013/404].

Author

V.Velichkov, vesse.nosp@m.lin..nosp@m.velic.nosp@m.hkov.nosp@m.@uni..nosp@m.lu

Date

2012-2013

Function Documentation

uint32_t simon_compute_nkeywords	(	uint32_t	word_size,
		uint32_t	key_size
	)

Compute the number of key words depending on the word size

Parameters

word_size	word size
key_size	key size in bits

uint32_t simon_compute_nrounds	(	uint32_t	word_size,
		uint32_t	nkey_words,
		uint32_t *	zseq_j
	)

Compute the number of rounds for Simon and the index of the z-sequence

Parameters

word_size	word size
nkey_words	number of key words
zseq_j	index of the z-sequence g_simon_zseq

Returns

number of rounds

void simon_encrypt	(	uint32_t	key[SIMON_MAX_NROUNDS],
		uint32_t	nrounds,
		uint32_t *	x_in,
		uint32_t *	y_in
	)

Simon encryption procedure.

Parameters

key	expanded key
nrounds	number of rounds
x_in	first plaintext word
y_in	second plaintext word

uint32_t simon_get_keysize

(

uint32_t

word_size

)

Get the size of the key in bits depending on the word size

Parameters

word_size

word size in bits

void simon_key_expansion	(	uint32_t	key[SIMON_MAX_NROUNDS],
		uint32_t	Z[5][62],
		uint32_t	zseq_j,
		uint32_t	nrounds,
		uint32_t	nkey_words
	)

Simon key expansion procedure.

Parameters

key	original key (with enough space for the expanded key)
Z	the z-sequence ( g_simon_zseq)
zseq_j	index of the z-seqence
nrounds	number of rounds
nkey_words	number of key words

Variable Documentation

uint32_t g_simon_zseq[5][62]

Initial value:

=  {
  
  {1,1,1,1,1,0,1,0,0,0,1,0,0,1,0,1,0,1,1,0,0,0,0,1,1,1,0,0,1,1,0,  
        1,1,1,1,1,0,1,0,0,0,1,0,0,1,0,1,0,1,1,0,0,0,0,1,1,1,0,0,1,1,0},
  
  {1,0,0,0,1,1,1,0,1,1,1,1,1,0,0,1,0,0,1,1,0,0,0,0,1,0,1,1,0,1,0,
        1,0,0,0,1,1,1,0,1,1,1,1,1,0,0,1,0,0,1,1,0,0,0,0,1,0,1,1,0,1,0},
  
  {1,0,1,0,1,1,1,1,0,1,1,1,0,0,0,0,0,0,1,1,0,1,0,0,1,0,0,1,1,0,0,
        0,1,0,1,0,0,0,0,1,0,0,0,1,1,1,1,1,1,0,0,1,0,1,1,0,1,1,0,0,1,1},
  
  {1,1,0,1,1,0,1,1,1,0,1,0,1,1,0,0,0,1,1,0,0,1,0,1,1,1,1,0,0,0,0,
        0,0,1,0,0,1,0,0,0,1,0,1,0,0,1,1,1,0,0,1,1,0,1,0,0,0,0,1,1,1,1},
  
  {1,1,0,1,0,0,0,1,1,1,1,0,0,1,1,0,1,0,1,1,0,1,1,0,0,0,1,0,0,0,0,
        0,0,1,0,1,1,1,0,0,0,0,1,1,0,0,1,0,1,0,0,1,0,0,1,1,1,0,1,1,1,1}
}

Pre-computed z_j sequences (o <= j < 5) used in the key schedule of Simon.