求助，SHA256代码转换-jiming5233的回答

求助，SHA256代码转换

2020-01-30 13:46发布

小弟一直只会汇编，C不是很懂，近期有个项目老板要用atmel的A88SA102S加密，atmel官方提供的SHA256算法是AVR的，我想用在51上（STC的89或者12系列都可以），但是一直不成功，网上关于SHA256的介绍很少，在论坛上也找到了win2kddk 大哥的帖子，但是里面是非标的，似乎不合用，下面贴上atmel给的AVR的源代码，求高手帮忙指点，不胜感激！

SHA256.H文件：
#ifndef SHA2_H
#define SHA2_H

#define SHA224_DIGEST_SIZE ( 224 / 8)
#define SHA256_DIGEST_SIZE ( 256 / 8)

#define SHA256_BLOCK_SIZE  ( 512 / 8)
#define SHA224_BLOCK_SIZE  SHA256_BLOCK_SIZE

#ifndef SHA2_TYPES
#define SHA2_TYPES
typedef unsigned char uint8;
typedef unsigned int  uint16;
typedef unsigned long uint32;
#endif

#ifdef __cplusplus
extern "C" {
#endif

typedef struct {
uint32 tot_len;
uint32 len;
uint8 block[2 * SHA256_BLOCK_SIZE];
uint32 h[8];
} sha256_ctx;

void sha256_init(sha256_ctx * ctx);
void sha256_update(sha256_ctx *ctx, const uint8 *message, uint32 len);
void sha256_final(sha256_ctx *ctx, uint8 *digest);

void sha256_noPad(sha256_ctx *ctx, uint8 *digest);

void sha256(const uint8 *message, uint32 len, uint8 *digest);

#ifdef __cplusplus
}
#endif

#endif /* !SHA2_H */

SHA256.C 文件：
#if 0
#define UNROLL_LOOPS /* Enable loops unrolling */
#endif

#include <string.h>

#include "sha256.h"

#define SHFR(x, n) (x >> n)
#define ROTR(x, n) ((x >> n) | (x << ((sizeof(x) << 3) - n)))
#define ROTL(x, n) ((x << n) | (x >> ((sizeof(x) << 3) - n)))
#define CH(x, y, z)  ((x & y) ^ (~x & z))
#define MAJ(x, y, z) ((x & y) ^ (x & z) ^ (y & z))

#define SHA256_F1(x) (ROTR(x,  2) ^ ROTR(x, 13) ^ ROTR(x, 22))
#define SHA256_F2(x) (ROTR(x,  6) ^ ROTR(x, 11) ^ ROTR(x, 25))
#define SHA256_F3(x) (ROTR(x,  7) ^ ROTR(x, 18) ^ SHFR(x,  3))
#define SHA256_F4(x) (ROTR(x, 17) ^ ROTR(x, 19) ^ SHFR(x, 10))

#define UNPACK32(x, str)
{
*((str) + 3) = (uint8) ((x)    );
*((str) + 2) = (uint8) ((x) >>  8);
*((str) + 1) = (uint8) ((x) >> 16);
*((str) + 0) = (uint8) ((x) >> 24);
}

#define PACK32(str, x)
{
*(x) = ((uint32) *((str) + 3)    )
         | ((uint32) *((str) + 2) <<  8)
         | ((uint32) *((str) + 1) << 16)
         | ((uint32) *((str) + 0) << 24);
}

/* Macros used for loops unrolling */

#define SHA256_SCR(i)
{
w =  SHA256_F4(w[i -  2]) + w[i -  7]
      + SHA256_F3(w[i - 15]) + w[i - 16];
}

#define SHA256_EXP(a, b, c, d, e, f, g, h, j)
{
t1 = wv[h] + SHA256_F2(wv[e]) + CH(wv[e], wv[f], wv[g])
      + sha256_k[j] + w[j];
t2 = SHA256_F1(wv[a]) + MAJ(wv[a], wv, wv[c]);
wv[d] += t1;
wv[h] = t1 + t2;
}

uint32 sha256_h0[8] =
         {0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
         0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19};

uint32 sha256_k[64] =
         {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};

/* SHA-256 functions */

void sha256_transf(sha256_ctx *ctx, const uint8 *message,
               uint32 block_nb)
{
uint32 w[64];
uint32 wv[8];

uint32 t1, t2;
const uint8 *sub_block;
int i;

#ifndef UNROLL_LOOPS
int j;
#endif

for (i = 0; i < (int) block_nb; i++) {
      sub_block = message + (i << 6);

#ifndef UNROLL_LOOPS
      for (j = 0; j < 16; j++) {
         PACK32(&sub_block[j << 2], &w[j]);
      }

      for (j = 16; j < 64; j++) {
         SHA256_SCR(j);
      }

      for (j = 0; j < 8; j++) {
         wv[j] = ctx->h[j];
      }

      for (j = 0; j < 64; j++) {
         t1 = wv[7] + SHA256_F2(wv[4]) + CH(wv[4], wv[5], wv[6])
            + sha256_k[j] + w[j];
         t2 = SHA256_F1(wv[0]) + MAJ(wv[0], wv[1], wv[2]);
         wv[7] = wv[6];
         wv[6] = wv[5];
         wv[5] = wv[4];
         wv[4] = wv[3] + t1;
         wv[3] = wv[2];
         wv[2] = wv[1];
         wv[1] = wv[0];
         wv[0] = t1 + t2;
      }

      for (j = 0; j < 8; j++) {
         ctx->h[j] += wv[j];
      }
#else
      PACK32(&sub_block[ 0], &w[ 0]); PACK32(&sub_block[ 4], &w[ 1]);
      PACK32(&sub_block[ 8], &w[ 2]); PACK32(&sub_block[12], &w[ 3]);
      PACK32(&sub_block[16], &w[ 4]); PACK32(&sub_block[20], &w[ 5]);
      PACK32(&sub_block[24], &w[ 6]); PACK32(&sub_block[28], &w[ 7]);
      PACK32(&sub_block[32], &w[ 8]); PACK32(&sub_block[36], &w[ 9]);
      PACK32(&sub_block[40], &w[10]); PACK32(&sub_block[44], &w[11]);
      PACK32(&sub_block[48], &w[12]); PACK32(&sub_block[52], &w[13]);
      PACK32(&sub_block[56], &w[14]); PACK32(&sub_block[60], &w[15]);

      SHA256_SCR(16); SHA256_SCR(17); SHA256_SCR(18); SHA256_SCR(19);
      SHA256_SCR(20); SHA256_SCR(21); SHA256_SCR(22); SHA256_SCR(23);
      SHA256_SCR(24); SHA256_SCR(25); SHA256_SCR(26); SHA256_SCR(27);
      SHA256_SCR(28); SHA256_SCR(29); SHA256_SCR(30); SHA256_SCR(31);
      SHA256_SCR(32); SHA256_SCR(33); SHA256_SCR(34); SHA256_SCR(35);
      SHA256_SCR(36); SHA256_SCR(37); SHA256_SCR(38); SHA256_SCR(39);
      SHA256_SCR(40); SHA256_SCR(41); SHA256_SCR(42); SHA256_SCR(43);
      SHA256_SCR(44); SHA256_SCR(45); SHA256_SCR(46); SHA256_SCR(47);
      SHA256_SCR(48); SHA256_SCR(49); SHA256_SCR(50); SHA256_SCR(51);
      SHA256_SCR(52); SHA256_SCR(53); SHA256_SCR(54); SHA256_SCR(55);
      SHA256_SCR(56); SHA256_SCR(57); SHA256_SCR(58); SHA256_SCR(59);
      SHA256_SCR(60); SHA256_SCR(61); SHA256_SCR(62); SHA256_SCR(63);

      wv[0] = ctx->h[0]; wv[1] = ctx->h[1];
      wv[2] = ctx->h[2]; wv[3] = ctx->h[3];
      wv[4] = ctx->h[4]; wv[5] = ctx->h[5];
      wv[6] = ctx->h[6]; wv[7] = ctx->h[7];

      SHA256_EXP(0,1,2,3,4,5,6,7, 0); SHA256_EXP(7,0,1,2,3,4,5,6, 1);
      SHA256_EXP(6,7,0,1,2,3,4,5, 2); SHA256_EXP(5,6,7,0,1,2,3,4, 3);
      SHA256_EXP(4,5,6,7,0,1,2,3, 4); SHA256_EXP(3,4,5,6,7,0,1,2, 5);
      SHA256_EXP(2,3,4,5,6,7,0,1, 6); SHA256_EXP(1,2,3,4,5,6,7,0, 7);
      SHA256_EXP(0,1,2,3,4,5,6,7, 8); SHA256_EXP(7,0,1,2,3,4,5,6, 9);
      SHA256_EXP(6,7,0,1,2,3,4,5,10); SHA256_EXP(5,6,7,0,1,2,3,4,11);
      SHA256_EXP(4,5,6,7,0,1,2,3,12); SHA256_EXP(3,4,5,6,7,0,1,2,13);
      SHA256_EXP(2,3,4,5,6,7,0,1,14); SHA256_EXP(1,2,3,4,5,6,7,0,15);
      SHA256_EXP(0,1,2,3,4,5,6,7,16); SHA256_EXP(7,0,1,2,3,4,5,6,17);
      SHA256_EXP(6,7,0,1,2,3,4,5,18); SHA256_EXP(5,6,7,0,1,2,3,4,19);
      SHA256_EXP(4,5,6,7,0,1,2,3,20); SHA256_EXP(3,4,5,6,7,0,1,2,21);
      SHA256_EXP(2,3,4,5,6,7,0,1,22); SHA256_EXP(1,2,3,4,5,6,7,0,23);
      SHA256_EXP(0,1,2,3,4,5,6,7,24); SHA256_EXP(7,0,1,2,3,4,5,6,25);
      SHA256_EXP(6,7,0,1,2,3,4,5,26); SHA256_EXP(5,6,7,0,1,2,3,4,27);
      SHA256_EXP(4,5,6,7,0,1,2,3,28); SHA256_EXP(3,4,5,6,7,0,1,2,29);
      SHA256_EXP(2,3,4,5,6,7,0,1,30); SHA256_EXP(1,2,3,4,5,6,7,0,31);
      SHA256_EXP(0,1,2,3,4,5,6,7,32); SHA256_EXP(7,0,1,2,3,4,5,6,33);
      SHA256_EXP(6,7,0,1,2,3,4,5,34); SHA256_EXP(5,6,7,0,1,2,3,4,35);
      SHA256_EXP(4,5,6,7,0,1,2,3,36); SHA256_EXP(3,4,5,6,7,0,1,2,37);
      SHA256_EXP(2,3,4,5,6,7,0,1,38); SHA256_EXP(1,2,3,4,5,6,7,0,39);
      SHA256_EXP(0,1,2,3,4,5,6,7,40); SHA256_EXP(7,0,1,2,3,4,5,6,41);
      SHA256_EXP(6,7,0,1,2,3,4,5,42); SHA256_EXP(5,6,7,0,1,2,3,4,43);
      SHA256_EXP(4,5,6,7,0,1,2,3,44); SHA256_EXP(3,4,5,6,7,0,1,2,45);
      SHA256_EXP(2,3,4,5,6,7,0,1,46); SHA256_EXP(1,2,3,4,5,6,7,0,47);
      SHA256_EXP(0,1,2,3,4,5,6,7,48); SHA256_EXP(7,0,1,2,3,4,5,6,49);
      SHA256_EXP(6,7,0,1,2,3,4,5,50); SHA256_EXP(5,6,7,0,1,2,3,4,51);
      SHA256_EXP(4,5,6,7,0,1,2,3,52); SHA256_EXP(3,4,5,6,7,0,1,2,53);
      SHA256_EXP(2,3,4,5,6,7,0,1,54); SHA256_EXP(1,2,3,4,5,6,7,0,55);
      SHA256_EXP(0,1,2,3,4,5,6,7,56); SHA256_EXP(7,0,1,2,3,4,5,6,57);
      SHA256_EXP(6,7,0,1,2,3,4,5,58); SHA256_EXP(5,6,7,0,1,2,3,4,59);
      SHA256_EXP(4,5,6,7,0,1,2,3,60); SHA256_EXP(3,4,5,6,7,0,1,2,61);
      SHA256_EXP(2,3,4,5,6,7,0,1,62); SHA256_EXP(1,2,3,4,5,6,7,0,63);

      ctx->h[0] += wv[0]; ctx->h[1] += wv[1];
      ctx->h[2] += wv[2]; ctx->h[3] += wv[3];
      ctx->h[4] += wv[4]; ctx->h[5] += wv[5];
      ctx->h[6] += wv[6]; ctx->h[7] += wv[7];
#endif /* !UNROLL_LOOPS */
}
}

void sha256(const uint8 *message, uint32 len, uint8 *digest)
{
sha256_ctx ctx;

sha256_init(&ctx);
sha256_update(&ctx, message, len);
sha256_final(&ctx, digest);
}

void sha256_init(sha256_ctx *ctx)
{
#ifndef UNROLL_LOOPS
int i;
for (i = 0; i < 8; i++) {
      ctx->h = sha256_h0;
}
#else
ctx->h[0] = sha256_h0[0]; ctx->h[1] = sha256_h0[1];
ctx->h[2] = sha256_h0[2]; ctx->h[3] = sha256_h0[3];
ctx->h[4] = sha256_h0[4]; ctx->h[5] = sha256_h0[5];
ctx->h[6] = sha256_h0[6]; ctx->h[7] = sha256_h0[7];
#endif /* !UNROLL_LOOPS */

ctx->len = 0;
ctx->tot_len = 0;
}

void sha256_update(sha256_ctx *ctx, const uint8 *message,
               uint32 len)
{
uint32 block_nb;
uint32 new_len, rem_len, tmp_len;
const uint8 *shifted_message;

tmp_len = SHA256_BLOCK_SIZE - ctx->len;
rem_len = len < tmp_len ? len : tmp_len;

memcpy(&ctx->block[ctx->len], message, rem_len);

if (ctx->len + len < SHA256_BLOCK_SIZE) {
      ctx->len += len;
      return;
}

new_len = len - rem_len;
block_nb = new_len / SHA256_BLOCK_SIZE;

shifted_message = message + rem_len;

sha256_transf(ctx, ctx->block, 1);
sha256_transf(ctx, shifted_message, block_nb);

rem_len = new_len % SHA256_BLOCK_SIZE;

memcpy(ctx->block, &shifted_message[block_nb << 6],
         rem_len);

ctx->len = rem_len;
ctx->tot_len += (block_nb + 1) << 6;
}

void sha256_final(sha256_ctx *ctx, uint8 *digest)
{
uint32 block_nb;
uint32 pm_len;
uint32 len_b;

#ifndef UNROLL_LOOPS
int i;
#endif

block_nb = (1 + ((SHA256_BLOCK_SIZE - 9)
                  < (ctx->len % SHA256_BLOCK_SIZE)));

len_b = (ctx->tot_len + ctx->len) << 3;
pm_len = block_nb << 6;

memset(ctx->block + ctx->len, 0, pm_len - ctx->len);
ctx->block[ctx->len] = 0x80;
UNPACK32(len_b, ctx->block + pm_len - 4);

sha256_transf(ctx, ctx->block, block_nb);

#ifndef UNROLL_LOOPS
for (i = 0 ; i < 8; i++) {
      UNPACK32(ctx->h, &digest[i << 2]);
}
#else
UNPACK32(ctx->h[0], &digest[ 0]);
UNPACK32(ctx->h[1], &digest[ 4]);
UNPACK32(ctx->h[2], &digest[ 8]);
UNPACK32(ctx->h[3], &digest[12]);
UNPACK32(ctx->h[4], &digest[16]);
UNPACK32(ctx->h[5], &digest[20]);
UNPACK32(ctx->h[6], &digest[24]);
UNPACK32(ctx->h[7], &digest[28]);
#endif /* !UNROLL_LOOPS */
}

void sha256_noPad(sha256_ctx *ctx, uint8 *digest)
{
int i;

for (i = 0 ; i < 8; i++) {
      UNPACK32(ctx->h, &digest[i << 2]);
}
}

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4条回答

jiming5233
2020-01-30 17:06

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