0,0 → 1,158 |
/********************************************************************* |
* Filename: sha256.c |
* Author: Brad Conte (brad AT bradconte.com) |
* Copyright: |
* Disclaimer: This code is presented "as is" without any guarantees. |
* Details: Implementation of the SHA-256 hashing algorithm. |
SHA-256 is one of the three algorithms in the SHA2 |
specification. The others, SHA-384 and SHA-512, are not |
offered in this implementation. |
Algorithm specification can be found here: |
* http://csrc.nist.gov/publications/fips/fips180-2/fips180-2withchangenotice.pdf |
This implementation uses little endian byte order. |
*********************************************************************/ |
|
/*************************** HEADER FILES ***************************/ |
#include <stdlib.h> |
#include <string.h> |
#include "sha256.h" |
|
/****************************** MACROS ******************************/ |
#define ROTLEFT(a,b) (((a) << (b)) | ((a) >> (32-(b)))) |
#define ROTRIGHT(a,b) (((a) >> (b)) | ((a) << (32-(b)))) |
|
#define CH(x,y,z) (((x) & (y)) ^ (~(x) & (z))) |
#define MAJ(x,y,z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z))) |
#define EP0(x) (ROTRIGHT(x,2) ^ ROTRIGHT(x,13) ^ ROTRIGHT(x,22)) |
#define EP1(x) (ROTRIGHT(x,6) ^ ROTRIGHT(x,11) ^ ROTRIGHT(x,25)) |
#define SIG0(x) (ROTRIGHT(x,7) ^ ROTRIGHT(x,18) ^ ((x) >> 3)) |
#define SIG1(x) (ROTRIGHT(x,17) ^ ROTRIGHT(x,19) ^ ((x) >> 10)) |
|
/**************************** VARIABLES *****************************/ |
static const WORD 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 |
}; |
|
/*********************** FUNCTION DEFINITIONS ***********************/ |
void sha256_transform(SHA256_CTX *ctx, const BYTE data[]) |
{ |
WORD a, b, c, d, e, f, g, h, i, j, t1, t2, m[64]; |
|
for (i = 0, j = 0; i < 16; ++i, j += 4) |
m[i] = (data[j] << 24) | (data[j + 1] << 16) | (data[j + 2] << 8) | (data[j + 3]); |
for ( ; i < 64; ++i) |
m[i] = SIG1(m[i - 2]) + m[i - 7] + SIG0(m[i - 15]) + m[i - 16]; |
|
a = ctx->state[0]; |
b = ctx->state[1]; |
c = ctx->state[2]; |
d = ctx->state[3]; |
e = ctx->state[4]; |
f = ctx->state[5]; |
g = ctx->state[6]; |
h = ctx->state[7]; |
|
for (i = 0; i < 64; ++i) { |
t1 = h + EP1(e) + CH(e,f,g) + k[i] + m[i]; |
t2 = EP0(a) + MAJ(a,b,c); |
h = g; |
g = f; |
f = e; |
e = d + t1; |
d = c; |
c = b; |
b = a; |
a = t1 + t2; |
} |
|
ctx->state[0] += a; |
ctx->state[1] += b; |
ctx->state[2] += c; |
ctx->state[3] += d; |
ctx->state[4] += e; |
ctx->state[5] += f; |
ctx->state[6] += g; |
ctx->state[7] += h; |
} |
|
void sha256_init(SHA256_CTX *ctx) |
{ |
ctx->datalen = 0; |
ctx->bitlen = 0; |
ctx->state[0] = 0x6a09e667; |
ctx->state[1] = 0xbb67ae85; |
ctx->state[2] = 0x3c6ef372; |
ctx->state[3] = 0xa54ff53a; |
ctx->state[4] = 0x510e527f; |
ctx->state[5] = 0x9b05688c; |
ctx->state[6] = 0x1f83d9ab; |
ctx->state[7] = 0x5be0cd19; |
} |
|
void sha256_update(SHA256_CTX *ctx, const BYTE data[], size_t len) |
{ |
WORD i; |
|
for (i = 0; i < len; ++i) { |
ctx->data[ctx->datalen] = data[i]; |
ctx->datalen++; |
if (ctx->datalen == 64) { |
sha256_transform(ctx, ctx->data); |
ctx->bitlen += 512; |
ctx->datalen = 0; |
} |
} |
} |
|
void sha256_final(SHA256_CTX *ctx, BYTE hash[]) |
{ |
WORD i; |
|
i = ctx->datalen; |
|
// Pad whatever data is left in the buffer. |
if (ctx->datalen < 56) { |
ctx->data[i++] = 0x80; |
while (i < 56) |
ctx->data[i++] = 0x00; |
} |
else { |
ctx->data[i++] = 0x80; |
while (i < 64) |
ctx->data[i++] = 0x00; |
sha256_transform(ctx, ctx->data); |
memset(ctx->data, 0, 56); |
} |
|
// Append to the padding the total message's length in bits and transform. |
ctx->bitlen += ctx->datalen * 8; |
ctx->data[63] = ctx->bitlen; |
ctx->data[62] = ctx->bitlen >> 8; |
ctx->data[61] = ctx->bitlen >> 16; |
ctx->data[60] = ctx->bitlen >> 24; |
ctx->data[59] = ctx->bitlen >> 32; |
ctx->data[58] = ctx->bitlen >> 40; |
ctx->data[57] = ctx->bitlen >> 48; |
ctx->data[56] = ctx->bitlen >> 56; |
sha256_transform(ctx, ctx->data); |
|
// Since this implementation uses little endian byte ordering and SHA uses big endian, |
// reverse all the bytes when copying the final state to the output hash. |
for (i = 0; i < 4; ++i) { |
hash[i] = (ctx->state[0] >> (24 - i * 8)) & 0x000000ff; |
hash[i + 4] = (ctx->state[1] >> (24 - i * 8)) & 0x000000ff; |
hash[i + 8] = (ctx->state[2] >> (24 - i * 8)) & 0x000000ff; |
hash[i + 12] = (ctx->state[3] >> (24 - i * 8)) & 0x000000ff; |
hash[i + 16] = (ctx->state[4] >> (24 - i * 8)) & 0x000000ff; |
hash[i + 20] = (ctx->state[5] >> (24 - i * 8)) & 0x000000ff; |
hash[i + 24] = (ctx->state[6] >> (24 - i * 8)) & 0x000000ff; |
hash[i + 28] = (ctx->state[7] >> (24 - i * 8)) & 0x000000ff; |
} |
} |