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executable file 133 lines (118 sloc) 3.936 kb
#include "sha256.h"
#define SHA256_DIGEST_SIZE 32
typedef struct {
uint32_t state[8];
uint64_t count;
uint8_t buffer[64];
} CSha256;
#define rotlFixed(x, n) (((x) << (n)) | ((x) >> (32 - (n))))
#define rotrFixed(x, n) (((x) >> (n)) | ((x) << (32 - (n))))
#define S0(x) (rotrFixed(x, 2) ^ rotrFixed(x,13) ^ rotrFixed(x, 22))
#define S1(x) (rotrFixed(x, 6) ^ rotrFixed(x,11) ^ rotrFixed(x, 25))
#define s0(x) (rotrFixed(x, 7) ^ rotrFixed(x,18) ^ (x >> 3))
#define s1(x) (rotrFixed(x,17) ^ rotrFixed(x,19) ^ (x >> 10))
#define blk0(i) (W[i] = data[i])
#define blk2(i) (W[i&15] += s1(W[(i-2)&15]) + W[(i-7)&15] + s0(W[(i-15)&15]))
#define Ch(x,y,z) (z^(x&(y^z)))
#define Maj(x,y,z) ((x&y)|(z&(x|y)))
#define a(i) T[(0-(i))&7]
#define b(i) T[(1-(i))&7]
#define c(i) T[(2-(i))&7]
#define d(i) T[(3-(i))&7]
#define e(i) T[(4-(i))&7]
#define f(i) T[(5-(i))&7]
#define g(i) T[(6-(i))&7]
#define h(i) T[(7-(i))&7]
#define R(i) h(i) += S1(e(i)) + Ch(e(i),f(i),g(i)) + K[i+j] + (j?blk2(i):blk0(i));\
d(i) += h(i); h(i) += S0(a(i)) + Maj(a(i), b(i), c(i))
#define RX_8(i) R(i+0); R(i+1); R(i+2); R(i+3); R(i+4); R(i+5); R(i+6); R(i+7);
static const uint32_t 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
};
static void Sha256_Transform(uint32_t *state, const uint32_t *data) {
uint32_t W[16];
unsigned j;
uint32_t T[8];
for (j = 0; j < 8; j++)
T[j] = state[j];
for (j = 0; j < 64; j += 16) {
RX_8(0); RX_8(8);
}
for (j = 0; j < 8; j++)
state[j] += T[j];
}
#undef S0
#undef S1
#undef s0
#undef s1
static void Sha256_WriteByteBlock(CSha256 *p) {
uint32_t data32[16];
unsigned i;
for (i = 0; i < 16; i++)
data32[i] =
((uint32_t)(p->buffer[i * 4 ]) << 24) +
((uint32_t)(p->buffer[i * 4 + 1]) << 16) +
((uint32_t)(p->buffer[i * 4 + 2]) << 8) +
((uint32_t)(p->buffer[i * 4 + 3]));
Sha256_Transform(p->state, data32);
}
std::string compute_sha256(const uint8_t* data, size_t size) {
CSha256 p;
p.state[0] = 0x6a09e667;
p.state[1] = 0xbb67ae85;
p.state[2] = 0x3c6ef372;
p.state[3] = 0xa54ff53a;
p.state[4] = 0x510e527f;
p.state[5] = 0x9b05688c;
p.state[6] = 0x1f83d9ab;
p.state[7] = 0x5be0cd19;
p.count = 0;
uint32_t curBufferPos = (uint32_t)p.count & 0x3F;
while (size) {
p.buffer[curBufferPos++] = *data++;
p.count++;
size--;
if (curBufferPos == 64) {
curBufferPos = 0;
Sha256_WriteByteBlock(&p);
}
}
uint8_t digest[32];
uint64_t lenInBits = (p.count << 3);
curBufferPos = (uint32_t)p.count & 0x3F;
unsigned i;
p.buffer[curBufferPos++] = 0x80;
while (curBufferPos != (64 - 8)) {
curBufferPos &= 0x3F;
if (curBufferPos == 0)
Sha256_WriteByteBlock(&p);
p.buffer[curBufferPos++] = 0;
}
for (i = 0; i < 8; i++) {
p.buffer[curBufferPos++] = (uint8_t)(lenInBits >> 56);
lenInBits <<= 8;
}
Sha256_WriteByteBlock(&p);
for (i = 0; i < 8; i++) {
digest[i*4 ] = (uint8_t)(p.state[i] >> 24);
digest[i*4+1] = (uint8_t)(p.state[i] >> 16);
digest[i*4+2] = (uint8_t)(p.state[i] >> 8);
digest[i*4+3] = (uint8_t)(p.state[i]);
}
return std::string((const char*) &digest[0], 32);
}
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