sha256.c File Reference

Data Structures
struct	sha256_state
Defines
#define	CRYPT_OK   0
#define	CRYPT_NOP   -1
#define	CRYPT_INVALID_ARG   -2
#define	LOAD32H(x, y)   STMT_BEGIN x = ntohl(get_uint32((const char*)y)); STMT_END
#define	STORE32H(x, y)   STMT_BEGIN set_uint32((char*)y, htonl(x)); STMT_END
#define	STORE64H(x, y)
#define	RORc(x, y)   ( ((((unsigned long)(x)&0xFFFFFFFFUL)>>(unsigned long)((y)&31)) | ((unsigned long)(x)<<(unsigned long)(32-((y)&31)))) & 0xFFFFFFFFUL)
#define	MIN(x, y)   ( ((x)<(y))?(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	RND(a, b, c, d, e, f, g, h, i, ki)
Functions
static int	sha256_compress (sha256_state *md, unsigned char *buf)
static int	sha256_init (sha256_state *md)
static int	sha256_process (sha256_state *md, const unsigned char *in, unsigned long inlen)
static int	sha256_done (sha256_state *md, unsigned char *out)

---

Detailed Description

SHA256 by Tom St Denis

---

Define Documentation

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

Value:

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

#define STORE64H	(	x,
		y		)

Value:

STMT_BEGIN                                \
  set_uint32((char*)y, htonl((uint32_t)((x)>>32)));             \
  set_uint32(((char*)y)+4, htonl((uint32_t)((x)&0xffffffff)));  \
  STMT_END

---

Function Documentation

static int sha256_done	(	sha256_state *	md,
		unsigned char *	out
	)			[static]

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

static int sha256_init

(

sha256_state *

md

)

[static]

Initialize the hash state

Parameters:

md

The hash state you wish to initialize

Returns:

CRYPT_OK if successful

static int sha256_process	(	sha256_state *	md,
		const unsigned char *	in,
		unsigned long	inlen
	)			[static]

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