Referencia del Archivo src/libdigidoc/openssl/crypto/sha/sha256.c

#include <openssl/opensslconf.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/crypto.h>
#include <openssl/sha.h>
#include <openssl/opensslv.h>
#include "md32_common.h"

'defines'
#define	DATA_ORDER_IS_BIG_ENDIAN
#define	HASH_LONG   SHA_LONG
#define	HASH_CTX   SHA256_CTX
#define	HASH_CBLOCK   SHA_CBLOCK
#define	HASH_MAKE_STRING(c, s)
#define	HASH_UPDATE   SHA256_Update
#define	HASH_TRANSFORM   SHA256_Transform
#define	HASH_FINAL   SHA256_Final
#define	HASH_BLOCK_DATA_ORDER   sha256_block_data_order
#define	Sigma0(x)   (ROTATE((x),30) ^ ROTATE((x),19) ^ ROTATE((x),10))
#define	Sigma1(x)   (ROTATE((x),26) ^ ROTATE((x),21) ^ ROTATE((x),7))
#define	sigma0(x)   (ROTATE((x),25) ^ ROTATE((x),14) ^ ((x)>>3))
#define	sigma1(x)   (ROTATE((x),15) ^ ROTATE((x),13) ^ ((x)>>10))
#define	Ch(x, y, z)   (((x) & (y)) ^ ((~(x)) & (z)))
#define	Maj(x, y, z)   (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
#define	ROUND_00_15(i, a, b, c, d, e, f, g, h)
#define	ROUND_16_63(i, a, b, c, d, e, f, g, h, X)
Funciones
int	SHA224_Init (SHA256_CTX *c)
int	SHA256_Init (SHA256_CTX *c)
unsigned char *	SHA224 (const unsigned char *d, size_t n, unsigned char *md)
unsigned char *	SHA256 (const unsigned char *d, size_t n, unsigned char *md)
int	SHA224_Update (SHA256_CTX *c, const void *data, size_t len)
int	SHA224_Final (unsigned char *md, SHA256_CTX *c)
Variables
const char	SHA256_version [] = "SHA-256" OPENSSL_VERSION_PTEXT

---

Documentación de los 'defines'

#define Ch	(		x,
			y,
			z
	)		(((x) & (y)) ^ ((~(x)) & (z)))

#define DATA_ORDER_IS_BIG_ENDIAN

#define HASH_BLOCK_DATA_ORDER   sha256_block_data_order

#define HASH_CBLOCK   SHA_CBLOCK

#define HASH_CTX   SHA256_CTX

#define HASH_FINAL   SHA256_Final

#define HASH_LONG   SHA_LONG

#define HASH_MAKE_STRING	(		c,
			s
	)

Valor:

do {    \
        unsigned long ll;               \
        unsigned int  xn;               \
        switch ((c)->md_len)            \
        {   case SHA224_DIGEST_LENGTH:  \
                for (xn=0;xn<SHA224_DIGEST_LENGTH/4;xn++)       \
                {   ll=(c)->h[xn]; HOST_l2c(ll,(s));   }        \
                break;                  \
            case SHA256_DIGEST_LENGTH:  \
                for (xn=0;xn<SHA256_DIGEST_LENGTH/4;xn++)       \
                {   ll=(c)->h[xn]; HOST_l2c(ll,(s));   }        \
                break;                  \
            default:                    \
                if ((c)->md_len > SHA256_DIGEST_LENGTH) \
                    return 0;                           \
                for (xn=0;xn<(c)->md_len/4;xn++)                \
                {   ll=(c)->h[xn]; HOST_l2c(ll,(s));   }        \
                break;                  \
        }                               \
        } while (0)

#define HASH_TRANSFORM   SHA256_Transform

#define HASH_UPDATE   SHA256_Update

#define Maj	(		x,
			y,
			z
	)		(((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))

#define ROUND_00_15	(		i,
			a,
			b,
			c,
			d,
			e,
			f,
			g,
			h
	)

Valor:

do {    \
        T1 += h + Sigma1(e) + Ch(e,f,g) + K256[i];      \
        h = Sigma0(a) + Maj(a,b,c);                     \
        d += T1;        h += T1;                } while (0)

#define ROUND_16_63	(		i,
			a,
			b,
			c,
			d,
			e,
			f,
			g,
			h,
			X
	)

Valor:

do {    \
        s0 = X[(i+1)&0x0f];     s0 = sigma0(s0);        \
        s1 = X[(i+14)&0x0f];    s1 = sigma1(s1);        \
        T1 = X[(i)&0x0f] += s0 + s1 + X[(i+9)&0x0f];    \
        ROUND_00_15(i,a,b,c,d,e,f,g,h);         } while (0)

#define sigma0

(

x

)

(ROTATE((x),25) ^ ROTATE((x),14) ^ ((x)>>3))

#define Sigma0

(

x

)

(ROTATE((x),30) ^ ROTATE((x),19) ^ ROTATE((x),10))

#define sigma1

(

x

)

(ROTATE((x),15) ^ ROTATE((x),13) ^ ((x)>>10))

#define Sigma1

(

x

)

(ROTATE((x),26) ^ ROTATE((x),21) ^ ROTATE((x),7))

---

Documentación de las funciones

unsigned char* SHA224	(	const unsigned char *	d,
		size_t	n,
		unsigned char *	md
	)

int SHA224_Final	(	unsigned char *	md,
		SHA256_CTX *	c
	)

int SHA224_Init

(

SHA256_CTX *

c

)

int SHA224_Update	(	SHA256_CTX *	c,
		const void *	data,
		size_t	len
	)

unsigned char* SHA256	(	const unsigned char *	d,
		size_t	n,
		unsigned char *	md
	)

int SHA256_Init

(

SHA256_CTX *

c

)

---

Documentación de las variables

const char SHA256_version[] = "SHA-256" OPENSSL_VERSION_PTEXT