sha256-internal.c File Reference

SHA-256 hash implementation and interface functions. More...

#include "includes.h"
#include "common.h"
#include "sha256.h"
#include "sha256_i.h"
#include "crypto.h"

Macros
#define	RORc(x, y)
#define	Ch(x, y, z)   (z ^ (x & (y ^ z)))
#define	Maj(x, y, z)   (((x | y) & z) | (x & y))
#define	S(x, n)   RORc((x), (n))
#define	R(x, n)   (((x)&0xFFFFFFFFUL)>>(n))
#define	Sigma0(x)   (S(x, 2) ^ S(x, 13) ^ S(x, 22))
#define	Sigma1(x)   (S(x, 6) ^ S(x, 11) ^ S(x, 25))
#define	Gamma0(x)   (S(x, 7) ^ S(x, 18) ^ R(x, 3))
#define	Gamma1(x)   (S(x, 17) ^ S(x, 19) ^ R(x, 10))
#define	MIN(x, y)   (((x) < (y)) ? (x) : (y))
#define	RND(a, b, c, d, e, f, g, h, i)

Functions
int	sha256_vector (size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
	SHA256 hash for data vector. More...
void	sha256_init (struct sha256_state *md)
int	sha256_process (struct sha256_state *md, const unsigned char *in, unsigned long inlen)
int	sha256_done (struct sha256_state *md, unsigned char *out)

Detailed Description

SHA-256 hash implementation and interface functions.

Macro Definition Documentation

#define RND	(		a,
			b,
			c,
			d,
			e,
			f,
			g,
			h,
			i
	)

Value:

t0 = h + Sigma1(e) + Ch(e, f, g) + K[i] + W[i]; \
        t1 = Sigma0(a) + Maj(a, b, c);                  \
        d += t0;                                        \
        h  = t0 + t1;

#define RORc	(		x,
			y
	)

Value:

( ((((unsigned long) (x) & 0xFFFFFFFFUL) >> (unsigned long) ((y) & 31)) | \
   ((unsigned long) (x) << (unsigned long) (32 - ((y) & 31)))) & 0xFFFFFFFFUL)

Function Documentation

int sha256_done	(	struct sha256_state *	md,
		unsigned char *	out
	)

Terminate the hash to get the digest

Parameters

md	The hash state
out	[out] The destination of the hash (32 bytes)

Returns

CRYPT_OK if successful

int sha256_process	(	struct sha256_state *	md,
		const unsigned char *	in,
		unsigned long	inlen
	)

Process a block of memory though the hash

Parameters

md	The hash state
in	The data to hash
inlen	The length of the data (octets)

Returns

CRYPT_OK if successful

int sha256_vector	(	size_t	num_elem,
		const u8 *	addr[],
		const size_t *	len,
		u8 *	mac
	)

SHA256 hash for data vector.

Parameters

num_elem	Number of elements in the data vector
addr	Pointers to the data areas
len	Lengths of the data blocks
mac	Buffer for the hash

Returns

0 on success, -1 of failure