tc_sha256.c File Reference

#include "tc_sha256.h"
#include "tc_constants.h"
#include "tc_utils.h"
#include <stdio.h>

Macros
#define	Sigma0(a)   (ROTR((a), 2) ^ ROTR((a), 13) ^ ROTR((a), 22))
#define	Sigma1(a)   (ROTR((a), 6) ^ ROTR((a), 11) ^ ROTR((a), 25))
#define	sigma0(a)   (ROTR((a), 7) ^ ROTR((a), 18) ^ ((a) >> 3))
#define	sigma1(a)   (ROTR((a), 17) ^ ROTR((a), 19) ^ ((a) >> 10))
#define	Ch(a, b, c)   (((a) & (b)) ^ ((~(a)) & (c)))
#define	Maj(a, b, c)   (((a) & (b)) ^ ((a) & (c)) ^ ((b) & (c)))

Functions
static void	compress (unsigned int *iv, const uint8_t *data)
int	tc_sha256_init (TCSha256State_t s)
	SHA256 initialization procedure Initializes s. More...
int	tc_sha256_update (TCSha256State_t s, const uint8_t *data, size_t datalen)
	SHA256 update procedure Hashes data_length bytes addressed by data into state s. More...
int	tc_sha256_final (uint8_t *digest, TCSha256State_t s)
	SHA256 final procedure Inserts the completed hash computation into digest. More...
static unsigned int	ROTR (unsigned int a, unsigned int n)
static unsigned int	BigEndian (const uint8_t **c)

Variables
static const unsigned int	k256 [64]

Macro Definition Documentation

Ch

#define Ch	(		a,
			b,
			c
	)		(((a) & (b)) ^ ((~(a)) & (c)))

Maj

#define Maj	(		a,
			b,
			c
	)		(((a) & (b)) ^ ((a) & (c)) ^ ((b) & (c)))

Sigma0

#define Sigma0

(

a

)

(ROTR((a), 2) ^ ROTR((a), 13) ^ ROTR((a), 22))

sigma0

#define sigma0

(

a

)

(ROTR((a), 7) ^ ROTR((a), 18) ^ ((a) >> 3))

Sigma1

#define Sigma1

(

a

)

(ROTR((a), 6) ^ ROTR((a), 11) ^ ROTR((a), 25))

sigma1

#define sigma1

(

a

)

(ROTR((a), 17) ^ ROTR((a), 19) ^ ((a) >> 10))

Function Documentation

BigEndian()

static unsigned int BigEndian ( const uint8_t **  c )

inlinestatic

compress()

static void compress ( unsigned int *  iv, const uint8_t *  data  )

static

ROTR()

static unsigned int ROTR ( unsigned int  a, unsigned int  n  )

inlinestatic

tc_sha256_final()

int tc_sha256_final	(	uint8_t *	digest,
		TCSha256State_t	s
	)

SHA256 final procedure Inserts the completed hash computation into digest.

Returns

returns TC_CRYPTO_SUCCESS (1) returns TC_CRYPTO_FAIL (0) if: s == NULL, s->iv == NULL, digest == NULL

Note

Assumes: s has been initialized by tc_sha256_init digest points to at least TC_SHA256_DIGEST_SIZE bytes

Warning

The state buffer 'leftover' is left in memory after processing If your application intends to have sensitive data in this buffer, remind to erase it after the data has been processed

Parameters

digest	unsigned eight bit integer
Sha256	state struct

tc_sha256_init()

int tc_sha256_init

(

TCSha256State_t

s

)

SHA256 initialization procedure Initializes s.

Returns

returns TC_CRYPTO_SUCCESS (1) returns TC_CRYPTO_FAIL (0) if s == NULL

Parameters

s	Sha256 state struct

tc_sha256_update()

int tc_sha256_update	(	TCSha256State_t	s,
		const uint8_t *	data,
		size_t	datalen
	)

SHA256 update procedure Hashes data_length bytes addressed by data into state s.

Returns

returns TC_CRYPTO_SUCCESS (1) returns TC_CRYPTO_FAIL (0) if: s == NULL, s->iv == NULL, data == NULL

Note

Assumes s has been initialized by tc_sha256_init

Warning

The state buffer 'leftover' is left in memory after processing If your application intends to have sensitive data in this buffer, remind to erase it after the data has been processed

Parameters

s	Sha256 state struct
data	message to hash
datalen	length of message to hash

Variable Documentation

k256

const unsigned int k256[64]

static

Initial value:

= {
  0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1,
  0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
  0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 0xe49b69c1, 0xefbe4786,
  0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
  0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147,
  0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
  0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, 0xa2bfe8a1, 0xa81a664b,
  0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
  0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a,
  0x5b9cca4f, 0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
  0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
}