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/* 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↩
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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);↩
}↩