1/* Crypto/Sha256.c -- SHA-256 Hash
  22010-06-11 : Igor Pavlov : Public domain
  3This code is based on public domain code from Wei Dai's Crypto++ library. */
  4
  5#include "Precomp.h"
  6
  7#include "RotateDefs.h"
  8#include "Sha256.h"
  9
 10/* define it for speed optimization */
 11/* #define _SHA256_UNROLL */
 12/* #define _SHA256_UNROLL2 */
 13
 14void Sha256_Init(CSha256 *p)
 15{
 16  p->state[0] = 0x6a09e667;
 17  p->state[1] = 0xbb67ae85;
 18  p->state[2] = 0x3c6ef372;
 19  p->state[3] = 0xa54ff53a;
 20  p->state[4] = 0x510e527f;
 21  p->state[5] = 0x9b05688c;
 22  p->state[6] = 0x1f83d9ab;
 23  p->state[7] = 0x5be0cd19;
 24  p->count = 0;
 25}
 26
 27#define S0(x) (rotrFixed(x, 2) ^ rotrFixed(x,13) ^ rotrFixed(x, 22))
 28#define S1(x) (rotrFixed(x, 6) ^ rotrFixed(x,11) ^ rotrFixed(x, 25))
 29#define s0(x) (rotrFixed(x, 7) ^ rotrFixed(x,18) ^ (x >> 3))
 30#define s1(x) (rotrFixed(x,17) ^ rotrFixed(x,19) ^ (x >> 10))
 31
 32#define blk0(i) (W[i] = data[i])
 33#define blk2(i) (W[i&15] += s1(W[(i-2)&15]) + W[(i-7)&15] + s0(W[(i-15)&15]))
 34
 35#define Ch(x,y,z) (z^(x&(y^z)))
 36#define Maj(x,y,z) ((x&y)|(z&(x|y)))
 37
 38#define a(i) T[(0-(i))&7]
 39#define b(i) T[(1-(i))&7]
 40#define c(i) T[(2-(i))&7]
 41#define d(i) T[(3-(i))&7]
 42#define e(i) T[(4-(i))&7]
 43#define f(i) T[(5-(i))&7]
 44#define g(i) T[(6-(i))&7]
 45#define h(i) T[(7-(i))&7]
 46
 47
 48#ifdef _SHA256_UNROLL2
 49
 50#define R(a,b,c,d,e,f,g,h, i) h += S1(e) + Ch(e,f,g) + K[i+j] + (j?blk2(i):blk0(i));\
 51  d += h; h += S0(a) + Maj(a, b, c)
 52
 53#define RX_8(i) \
 54  R(a,b,c,d,e,f,g,h, i); \
 55  R(h,a,b,c,d,e,f,g, i+1); \
 56  R(g,h,a,b,c,d,e,f, i+2); \
 57  R(f,g,h,a,b,c,d,e, i+3); \
 58  R(e,f,g,h,a,b,c,d, i+4); \
 59  R(d,e,f,g,h,a,b,c, i+5); \
 60  R(c,d,e,f,g,h,a,b, i+6); \
 61  R(b,c,d,e,f,g,h,a, i+7)
 62
 63#else
 64
 65#define R(i) h(i) += S1(e(i)) + Ch(e(i),f(i),g(i)) + K[i+j] + (j?blk2(i):blk0(i));\
 66  d(i) += h(i); h(i) += S0(a(i)) + Maj(a(i), b(i), c(i))
 67
 68#ifdef _SHA256_UNROLL
 69
 70#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);
 71
 72#endif
 73
 74#endif
 75
 76static const UInt32 K[64] = {
 77  0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
 78  0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
 79  0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
 80  0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
 81  0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
 82  0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
 83  0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
 84  0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
 85  0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
 86  0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
 87  0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
 88  0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
 89  0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
 90  0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
 91  0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
 92  0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
 93};
 94
 95static void Sha256_Transform(UInt32 *state, const UInt32 *data)
 96{
 97  UInt32 W[16];
 98  unsigned j;
 99  #ifdef _SHA256_UNROLL2
100  UInt32 a,b,c,d,e,f,g,h;
101  a = state[0];
102  b = state[1];
103  c = state[2];
104  d = state[3];
105  e = state[4];
106  f = state[5];
107  g = state[6];
108  h = state[7];
109  #else
110  UInt32 T[8];
111  for (j = 0; j < 8; j++)
112    T[j] = state[j];
113  #endif
114
115  for (j = 0; j < 64; j += 16)
116  {
117    #if defined(_SHA256_UNROLL) || defined(_SHA256_UNROLL2)
118    RX_8(0); RX_8(8);
119    #else
120    unsigned i;
121    for (i = 0; i < 16; i++) { R(i); }
122    #endif
123  }
124
125  #ifdef _SHA256_UNROLL2
126  state[0] += a;
127  state[1] += b;
128  state[2] += c;
129  state[3] += d;
130  state[4] += e;
131  state[5] += f;
132  state[6] += g;
133  state[7] += h;
134  #else
135  for (j = 0; j < 8; j++)
136    state[j] += T[j];
137  #endif
138  
139  /* Wipe variables */
140  /* memset(W, 0, sizeof(W)); */
141  /* memset(T, 0, sizeof(T)); */
142}
143
144#undef S0
145#undef S1
146#undef s0
147#undef s1
148
149static void Sha256_WriteByteBlock(CSha256 *p)
150{
151  UInt32 data32[16];
152  unsigned i;
153  for (i = 0; i < 16; i++)
154    data32[i] =
155      ((UInt32)(p->buffer[i * 4    ]) << 24) +
156      ((UInt32)(p->buffer[i * 4 + 1]) << 16) +
157      ((UInt32)(p->buffer[i * 4 + 2]) <<  8) +
158      ((UInt32)(p->buffer[i * 4 + 3]));
159  Sha256_Transform(p->state, data32);
160}
161
162void Sha256_Update(CSha256 *p, const Byte *data, size_t size)
163{
164  UInt32 curBufferPos = (UInt32)p->count & 0x3F;
165  while (size > 0)
166  {
167    p->buffer[curBufferPos++] = *data++;
168    p->count++;
169    size--;
170    if (curBufferPos == 64)
171    {
172      curBufferPos = 0;
173      Sha256_WriteByteBlock(p);
174    }
175  }
176}
177
178void Sha256_Final(CSha256 *p, Byte *digest)
179{
180  UInt64 lenInBits = (p->count << 3);
181  UInt32 curBufferPos = (UInt32)p->count & 0x3F;
182  unsigned i;
183  p->buffer[curBufferPos++] = 0x80;
184  while (curBufferPos != (64 - 8))
185  {
186    curBufferPos &= 0x3F;
187    if (curBufferPos == 0)
188      Sha256_WriteByteBlock(p);
189    p->buffer[curBufferPos++] = 0;
190  }
191  for (i = 0; i < 8; i++)
192  {
193    p->buffer[curBufferPos++] = (Byte)(lenInBits >> 56);
194    lenInBits <<= 8;
195  }
196  Sha256_WriteByteBlock(p);
197
198  for (i = 0; i < 8; i++)
199  {
200    *digest++ = (Byte)(p->state[i] >> 24);
201    *digest++ = (Byte)(p->state[i] >> 16);
202    *digest++ = (Byte)(p->state[i] >> 8);
203    *digest++ = (Byte)(p->state[i]);
204  }
205  Sha256_Init(p);
206}