Merge pull request #511 from negativeExponent/updates

[pcsx_rearmed.git] / deps / lzma-16.04 / C / Sha256.c

/* Crypto/Sha256.c -- SHA-256 Hash\r
2015-11-14 : Igor Pavlov : Public domain\r
This code is based on public domain code from Wei Dai's Crypto++ library. */\r
\r
#include "Precomp.h"\r
\r
#include <string.h>\r
\r
#include "CpuArch.h"\r
#include "RotateDefs.h"\r
#include "Sha256.h"\r
\r
/* define it for speed optimization */\r
#ifndef _SFX\r
#define _SHA256_UNROLL\r
#define _SHA256_UNROLL2\r
#endif\r
\r
/* #define _SHA256_UNROLL2 */\r
\r
void Sha256_Init(CSha256 *p)\r
{\r
  p->state[0] = 0x6a09e667;\r
  p->state[1] = 0xbb67ae85;\r
  p->state[2] = 0x3c6ef372;\r
  p->state[3] = 0xa54ff53a;\r
  p->state[4] = 0x510e527f;\r
  p->state[5] = 0x9b05688c;\r
  p->state[6] = 0x1f83d9ab;\r
  p->state[7] = 0x5be0cd19;\r
  p->count = 0;\r
}\r
\r
#define S0(x) (rotrFixed(x, 2) ^ rotrFixed(x,13) ^ rotrFixed(x, 22))\r
#define S1(x) (rotrFixed(x, 6) ^ rotrFixed(x,11) ^ rotrFixed(x, 25))\r
#define s0(x) (rotrFixed(x, 7) ^ rotrFixed(x,18) ^ (x >> 3))\r
#define s1(x) (rotrFixed(x,17) ^ rotrFixed(x,19) ^ (x >> 10))\r
\r
#define blk0(i) (W[i])\r
#define blk2(i) (W[i] += s1(W[((i)-2)&15]) + W[((i)-7)&15] + s0(W[((i)-15)&15]))\r
\r
#define Ch(x,y,z) (z^(x&(y^z)))\r
#define Maj(x,y,z) ((x&y)|(z&(x|y)))\r
\r
#ifdef _SHA256_UNROLL2\r
\r
#define R(a,b,c,d,e,f,g,h, i) \\r
    h += S1(e) + Ch(e,f,g) + K[(i)+(j)] + (j ? blk2(i) : blk0(i)); \\r
    d += h; \\r
    h += S0(a) + Maj(a, b, c)\r
\r
#define RX_8(i) \\r
  R(a,b,c,d,e,f,g,h, i); \\r
  R(h,a,b,c,d,e,f,g, i+1); \\r
  R(g,h,a,b,c,d,e,f, i+2); \\r
  R(f,g,h,a,b,c,d,e, i+3); \\r
  R(e,f,g,h,a,b,c,d, i+4); \\r
  R(d,e,f,g,h,a,b,c, i+5); \\r
  R(c,d,e,f,g,h,a,b, i+6); \\r
  R(b,c,d,e,f,g,h,a, i+7)\r
\r
#define RX_16  RX_8(0); RX_8(8);\r
\r
#else\r
\r
#define a(i) T[(0-(i))&7]\r
#define b(i) T[(1-(i))&7]\r
#define c(i) T[(2-(i))&7]\r
#define d(i) T[(3-(i))&7]\r
#define e(i) T[(4-(i))&7]\r
#define f(i) T[(5-(i))&7]\r
#define g(i) T[(6-(i))&7]\r
#define h(i) T[(7-(i))&7]\r
\r
#define R(i) \\r
    h(i) += S1(e(i)) + Ch(e(i),f(i),g(i)) + K[(i)+(j)] + (j ? blk2(i) : blk0(i)); \\r
    d(i) += h(i); \\r
    h(i) += S0(a(i)) + Maj(a(i), b(i), c(i)) \\r
\r
#ifdef _SHA256_UNROLL\r
\r
#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);\r
#define RX_16  RX_8(0); RX_8(8);\r
\r
#else\r
\r
#define RX_16  unsigned i; for (i = 0; i < 16; i++) { R(i); }\r
\r
#endif\r
\r
#endif\r
\r
static const UInt32 K[64] = {\r
  0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,\r
  0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,\r
  0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,\r
  0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,\r
  0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,\r
  0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,\r
  0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,\r
  0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,\r
  0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,\r
  0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,\r
  0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,\r
  0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,\r
  0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,\r
  0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,\r
  0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,\r
  0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2\r
};\r
\r
static void Sha256_WriteByteBlock(CSha256 *p)\r
{\r
  UInt32 W[16];\r
  unsigned j;\r
  UInt32 *state;\r
\r
  #ifdef _SHA256_UNROLL2\r
  UInt32 a,b,c,d,e,f,g,h;\r
  #else\r
  UInt32 T[8];\r
  #endif\r
\r
  for (j = 0; j < 16; j += 4)\r
  {\r
    const Byte *ccc = p->buffer + j * 4;\r
    W[j    ] = GetBe32(ccc);\r
    W[j + 1] = GetBe32(ccc + 4);\r
    W[j + 2] = GetBe32(ccc + 8);\r
    W[j + 3] = GetBe32(ccc + 12);\r
  }\r
\r
  state = p->state;\r
\r
  #ifdef _SHA256_UNROLL2\r
  a = state[0];\r
  b = state[1];\r
  c = state[2];\r
  d = state[3];\r
  e = state[4];\r
  f = state[5];\r
  g = state[6];\r
  h = state[7];\r
  #else\r
  for (j = 0; j < 8; j++)\r
    T[j] = state[j];\r
  #endif\r
\r
  for (j = 0; j < 64; j += 16)\r
  {\r
    RX_16\r
  }\r
\r
  #ifdef _SHA256_UNROLL2\r
  state[0] += a;\r
  state[1] += b;\r
  state[2] += c;\r
  state[3] += d;\r
  state[4] += e;\r
  state[5] += f;\r
  state[6] += g;\r
  state[7] += h;\r
  #else\r
  for (j = 0; j < 8; j++)\r
    state[j] += T[j];\r
  #endif\r
  \r
  /* Wipe variables */\r
  /* memset(W, 0, sizeof(W)); */\r
  /* memset(T, 0, sizeof(T)); */\r
}\r
\r
#undef S0\r
#undef S1\r
#undef s0\r
#undef s1\r
\r
void Sha256_Update(CSha256 *p, const Byte *data, size_t size)\r
{\r
  if (size == 0)\r
    return;\r
\r
  {\r
    unsigned pos = (unsigned)p->count & 0x3F;\r
    unsigned num;\r
    \r
    p->count += size;\r
    \r
    num = 64 - pos;\r
    if (num > size)\r
    {\r
      memcpy(p->buffer + pos, data, size);\r
      return;\r
    }\r
    \r
    size -= num;\r
    memcpy(p->buffer + pos, data, num);\r
    data += num;\r
  }\r
\r
  for (;;)\r
  {\r
    Sha256_WriteByteBlock(p);\r
    if (size < 64)\r
      break;\r
    size -= 64;\r
    memcpy(p->buffer, data, 64);\r
    data += 64;\r
  }\r
\r
  if (size != 0)\r
    memcpy(p->buffer, data, size);\r
}\r
\r
void Sha256_Final(CSha256 *p, Byte *digest)\r
{\r
  unsigned pos = (unsigned)p->count & 0x3F;\r
  unsigned i;\r
  \r
  p->buffer[pos++] = 0x80;\r
  \r
  while (pos != (64 - 8))\r
  {\r
    pos &= 0x3F;\r
    if (pos == 0)\r
      Sha256_WriteByteBlock(p);\r
    p->buffer[pos++] = 0;\r
  }\r
\r
  {\r
    UInt64 numBits = (p->count << 3);\r
    SetBe32(p->buffer + 64 - 8, (UInt32)(numBits >> 32));\r
    SetBe32(p->buffer + 64 - 4, (UInt32)(numBits));\r
  }\r
  \r
  Sha256_WriteByteBlock(p);\r
\r
  for (i = 0; i < 8; i += 2)\r
  {\r
    UInt32 v0 = p->state[i];\r
    UInt32 v1 = p->state[i + 1];\r
    SetBe32(digest    , v0);\r
    SetBe32(digest + 4, v1);\r
    digest += 8;\r
  }\r
  \r
  Sha256_Init(p);\r
}\r