/* Crypto/Sha256.c -- SHA-256 Hash | |
2017-04-03 : Igor Pavlov : Public domain | |
This code is based on public domain code from Wei Dai's Crypto++ library. */ | |
#include "Precomp.h" | |
#include <string.h> | |
#include "CpuArch.h" | |
#include "RotateDefs.h" | |
#include "Sha256.h" | |
/* define it for speed optimization */ | |
#ifndef _SFX | |
#define _SHA256_UNROLL | |
#define _SHA256_UNROLL2 | |
#endif | |
/* #define _SHA256_UNROLL2 */ | |
void Sha256_Init(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; | |
} | |
#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]) | |
#define blk2(i) (W[i] += 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))) | |
#ifdef _SHA256_UNROLL2 | |
#define R(a,b,c,d,e,f,g,h, i) \ | |
h += S1(e) + Ch(e,f,g) + K[(i)+(size_t)(j)] + (j ? blk2(i) : blk0(i)); \ | |
d += h; \ | |
h += S0(a) + Maj(a, b, c) | |
#define RX_8(i) \ | |
R(a,b,c,d,e,f,g,h, i); \ | |
R(h,a,b,c,d,e,f,g, i+1); \ | |
R(g,h,a,b,c,d,e,f, i+2); \ | |
R(f,g,h,a,b,c,d,e, i+3); \ | |
R(e,f,g,h,a,b,c,d, i+4); \ | |
R(d,e,f,g,h,a,b,c, i+5); \ | |
R(c,d,e,f,g,h,a,b, i+6); \ | |
R(b,c,d,e,f,g,h,a, i+7) | |
#define RX_16 RX_8(0); RX_8(8); | |
#else | |
#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)+(size_t)(j)] + (j ? blk2(i) : blk0(i)); \ | |
d(i) += h(i); \ | |
h(i) += S0(a(i)) + Maj(a(i), b(i), c(i)) \ | |
#ifdef _SHA256_UNROLL | |
#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); | |
#define RX_16 RX_8(0); RX_8(8); | |
#else | |
#define RX_16 unsigned i; for (i = 0; i < 16; i++) { R(i); } | |
#endif | |
#endif | |
static const UInt32 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_WriteByteBlock(CSha256 *p) | |
{ | |
UInt32 W[16]; | |
unsigned j; | |
UInt32 *state; | |
#ifdef _SHA256_UNROLL2 | |
UInt32 a,b,c,d,e,f,g,h; | |
#else | |
UInt32 T[8]; | |
#endif | |
for (j = 0; j < 16; j += 4) | |
{ | |
const Byte *ccc = p->buffer + j * 4; | |
W[j ] = GetBe32(ccc); | |
W[j + 1] = GetBe32(ccc + 4); | |
W[j + 2] = GetBe32(ccc + 8); | |
W[j + 3] = GetBe32(ccc + 12); | |
} | |
state = p->state; | |
#ifdef _SHA256_UNROLL2 | |
a = state[0]; | |
b = state[1]; | |
c = state[2]; | |
d = state[3]; | |
e = state[4]; | |
f = state[5]; | |
g = state[6]; | |
h = state[7]; | |
#else | |
for (j = 0; j < 8; j++) | |
T[j] = state[j]; | |
#endif | |
for (j = 0; j < 64; j += 16) | |
{ | |
RX_16 | |
} | |
#ifdef _SHA256_UNROLL2 | |
state[0] += a; | |
state[1] += b; | |
state[2] += c; | |
state[3] += d; | |
state[4] += e; | |
state[5] += f; | |
state[6] += g; | |
state[7] += h; | |
#else | |
for (j = 0; j < 8; j++) | |
state[j] += T[j]; | |
#endif | |
/* Wipe variables */ | |
/* memset(W, 0, sizeof(W)); */ | |
/* memset(T, 0, sizeof(T)); */ | |
} | |
#undef S0 | |
#undef S1 | |
#undef s0 | |
#undef s1 | |
void Sha256_Update(CSha256 *p, const Byte *data, size_t size) | |
{ | |
if (size == 0) | |
return; | |
{ | |
unsigned pos = (unsigned)p->count & 0x3F; | |
unsigned num; | |
p->count += size; | |
num = 64 - pos; | |
if (num > size) | |
{ | |
memcpy(p->buffer + pos, data, size); | |
return; | |
} | |
size -= num; | |
memcpy(p->buffer + pos, data, num); | |
data += num; | |
} | |
for (;;) | |
{ | |
Sha256_WriteByteBlock(p); | |
if (size < 64) | |
break; | |
size -= 64; | |
memcpy(p->buffer, data, 64); | |
data += 64; | |
} | |
if (size != 0) | |
memcpy(p->buffer, data, size); | |
} | |
void Sha256_Final(CSha256 *p, Byte *digest) | |
{ | |
unsigned pos = (unsigned)p->count & 0x3F; | |
unsigned i; | |
p->buffer[pos++] = 0x80; | |
while (pos != (64 - 8)) | |
{ | |
pos &= 0x3F; | |
if (pos == 0) | |
Sha256_WriteByteBlock(p); | |
p->buffer[pos++] = 0; | |
} | |
{ | |
UInt64 numBits = (p->count << 3); | |
SetBe32(p->buffer + 64 - 8, (UInt32)(numBits >> 32)); | |
SetBe32(p->buffer + 64 - 4, (UInt32)(numBits)); | |
} | |
Sha256_WriteByteBlock(p); | |
for (i = 0; i < 8; i += 2) | |
{ | |
UInt32 v0 = p->state[i]; | |
UInt32 v1 = p->state[i + 1]; | |
SetBe32(digest , v0); | |
SetBe32(digest + 4, v1); | |
digest += 8; | |
} | |
Sha256_Init(p); | |
} |