Sha256.c revision baa3858d3f5d128a5c8466b700098109edcad5f2 
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 "RotateDefs.h"
6#include "Sha256.h"
7
8/* define it for speed optimization */
9/* #define _SHA256_UNROLL */
10/* #define _SHA256_UNROLL2 */
11
12void Sha256_Init(CSha256 *p)
13{
14  p->state[0] = 0x6a09e667;
15  p->state[1] = 0xbb67ae85;
16  p->state[2] = 0x3c6ef372;
17  p->state[3] = 0xa54ff53a;
18  p->state[4] = 0x510e527f;
19  p->state[5] = 0x9b05688c;
20  p->state[6] = 0x1f83d9ab;
21  p->state[7] = 0x5be0cd19;
22  p->count = 0;
23}
24
25#define S0(x) (rotrFixed(x, 2) ^ rotrFixed(x,13) ^ rotrFixed(x, 22))
26#define S1(x) (rotrFixed(x, 6) ^ rotrFixed(x,11) ^ rotrFixed(x, 25))
27#define s0(x) (rotrFixed(x, 7) ^ rotrFixed(x,18) ^ (x >> 3))
28#define s1(x) (rotrFixed(x,17) ^ rotrFixed(x,19) ^ (x >> 10))
29
30#define blk0(i) (W[i] = data[i])
31#define blk2(i) (W[i&15] += s1(W[(i-2)&15]) + W[(i-7)&15] + s0(W[(i-15)&15]))
32
33#define Ch(x,y,z) (z^(x&(y^z)))
34#define Maj(x,y,z) ((x&y)|(z&(x|y)))
35
36#define a(i) T[(0-(i))&7]
37#define b(i) T[(1-(i))&7]
38#define c(i) T[(2-(i))&7]
39#define d(i) T[(3-(i))&7]
40#define e(i) T[(4-(i))&7]
41#define f(i) T[(5-(i))&7]
42#define g(i) T[(6-(i))&7]
43#define h(i) T[(7-(i))&7]
44
45
46#ifdef _SHA256_UNROLL2
47
48#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));\
49  d += h; h += S0(a) + Maj(a, b, c)
50
51#define RX_8(i) \
52  R(a,b,c,d,e,f,g,h, i); \
53  R(h,a,b,c,d,e,f,g, i+1); \
54  R(g,h,a,b,c,d,e,f, i+2); \
55  R(f,g,h,a,b,c,d,e, i+3); \
56  R(e,f,g,h,a,b,c,d, i+4); \
57  R(d,e,f,g,h,a,b,c, i+5); \
58  R(c,d,e,f,g,h,a,b, i+6); \
59  R(b,c,d,e,f,g,h,a, i+7)
60
61#else
62
63#define R(i) h(i) += S1(e(i)) + Ch(e(i),f(i),g(i)) + K[i+j] + (j?blk2(i):blk0(i));\
64  d(i) += h(i); h(i) += S0(a(i)) + Maj(a(i), b(i), c(i))
65
66#ifdef _SHA256_UNROLL
67
68#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);
69
70#endif
71
72#endif
73
74static const UInt32 K[64] = {
75  0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
76  0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
77  0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
78  0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
79  0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
80  0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
81  0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
82  0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
83  0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
84  0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
85  0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
86  0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
87  0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
88  0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
89  0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
90  0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
91};
92
93static void Sha256_Transform(UInt32 *state, const UInt32 *data)
94{
95  UInt32 W[16];
96  unsigned j;
97  #ifdef _SHA256_UNROLL2
98  UInt32 a,b,c,d,e,f,g,h;
99  a = state[0];
100  b = state[1];
101  c = state[2];
102  d = state[3];
103  e = state[4];
104  f = state[5];
105  g = state[6];
106  h = state[7];
107  #else
108  UInt32 T[8];
109  for (j = 0; j < 8; j++)
110    T[j] = state[j];
111  #endif
112
113  for (j = 0; j < 64; j += 16)
114  {
115    #if defined(_SHA256_UNROLL) || defined(_SHA256_UNROLL2)
116    RX_8(0); RX_8(8);
117    #else
118    unsigned i;
119    for (i = 0; i < 16; i++) { R(i); }
120    #endif
121  }
122
123  #ifdef _SHA256_UNROLL2
124  state[0] += a;
125  state[1] += b;
126  state[2] += c;
127  state[3] += d;
128  state[4] += e;
129  state[5] += f;
130  state[6] += g;
131  state[7] += h;
132  #else
133  for (j = 0; j < 8; j++)
134    state[j] += T[j];
135  #endif
136
137  /* Wipe variables */
138  /* memset(W, 0, sizeof(W)); */
139  /* memset(T, 0, sizeof(T)); */
140}
141
142#undef S0
143#undef S1
144#undef s0
145#undef s1
146
147static void Sha256_WriteByteBlock(CSha256 *p)
148{
149  UInt32 data32[16];
150  unsigned i;
151  for (i = 0; i < 16; i++)
152    data32[i] =
153      ((UInt32)(p->buffer[i * 4    ]) << 24) +
154      ((UInt32)(p->buffer[i * 4 + 1]) << 16) +
155      ((UInt32)(p->buffer[i * 4 + 2]) <<  8) +
156      ((UInt32)(p->buffer[i * 4 + 3]));
157  Sha256_Transform(p->state, data32);
158}
159
160void Sha256_Update(CSha256 *p, const Byte *data, size_t size)
161{
162  UInt32 curBufferPos = (UInt32)p->count & 0x3F;
163  while (size > 0)
164  {
165    p->buffer[curBufferPos++] = *data++;
166    p->count++;
167    size--;
168    if (curBufferPos == 64)
169    {
170      curBufferPos = 0;
171      Sha256_WriteByteBlock(p);
172    }
173  }
174}
175
176void Sha256_Final(CSha256 *p, Byte *digest)
177{
178  UInt64 lenInBits = (p->count << 3);
179  UInt32 curBufferPos = (UInt32)p->count & 0x3F;
180  unsigned i;
181  p->buffer[curBufferPos++] = 0x80;
182  while (curBufferPos != (64 - 8))
183  {
184    curBufferPos &= 0x3F;
185    if (curBufferPos == 0)
186      Sha256_WriteByteBlock(p);
187    p->buffer[curBufferPos++] = 0;
188  }
189  for (i = 0; i < 8; i++)
190  {
191    p->buffer[curBufferPos++] = (Byte)(lenInBits >> 56);
192    lenInBits <<= 8;
193  }
194  Sha256_WriteByteBlock(p);
195
196  for (i = 0; i < 8; i++)
197  {
198    *digest++ = (Byte)(p->state[i] >> 24);
199    *digest++ = (Byte)(p->state[i] >> 16);
200    *digest++ = (Byte)(p->state[i] >> 8);
201    *digest++ = (Byte)(p->state[i]);
202  }
203  Sha256_Init(p);
204}
205