speck.cc File Reference

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

#include "common.hh"
#include "speck.hh"

Functions
uint32_t	speck_compute_nkeywords (uint32_t word_size, uint32_t key_size)
uint32_t	speck_get_keysize (uint32_t word_size)
void	speck_get_rot_const (uint32_t word_size, uint32_t *alpha, uint32_t *beta)
uint32_t	speck_compute_nrounds (uint32_t word_size, uint32_t nkey_words)
void	speck_key_expansion (WORD_T key[SPECK_MAX_NROUNDS], uint32_t nrounds, uint32_t nkey_words, uint32_t alpha, uint32_t beta)
void	speck_encrypt (WORD_T key[SPECK_MAX_NROUNDS], uint32_t nrounds, uint32_t alpha, uint32_t beta, WORD_T *x_in, WORD_T *y_in)
void	speck_decrypt (WORD_T key[SPECK_MAX_NROUNDS], uint32_t nrounds, uint32_t alpha, uint32_t beta, WORD_T *x_in, WORD_T *y_in)

Detailed Description

Analysis of block cipher Speck [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 speck_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 speck_compute_nrounds	(	uint32_t	word_size,
		uint32_t	nkey_words
	)

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

Parameters

word_size	word size
nkey_words	number of key words

Returns

number of rounds

void speck_encrypt	(	WORD_T	key[SPECK_MAX_NROUNDS],
		uint32_t	nrounds,
		uint32_t	alpha,
		uint32_t	beta,
		WORD_T *	x_in,
		WORD_T *	y_in
	)

Speck encryption procedure.

Parameters

key	expanded key
nrounds	number of rounds
alpha	right rotation constant
beta	left rotation constant
x_in	first plaintext word
y_in	second plaintext word

uint32_t speck_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 speck_get_rot_const	(	uint32_t	word_size,
		uint32_t *	alpha,
		uint32_t *	beta
	)

Get the rotation constants.

void speck_key_expansion	(	WORD_T	key[SPECK_MAX_NROUNDS],
		uint32_t	nrounds,
		uint32_t	nkey_words,
		uint32_t	alpha,
		uint32_t	beta
	)

Speck key expansion procedure.

Parameters

key	original key (with enough space for the expanded key)
nrounds	number of rounds
nkey_words	number of key words
alpha	right rotation constant
beta	left rotation constant