1 /* Crypto/Sha256.c -- SHA-256 Hash
2 2010-06-11 : Igor Pavlov : Public domain
3 This 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
Sha256_Init(CSha256 * p)14 void 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
76 static 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
Sha256_Transform(UInt32 * state,const UInt32 * data)95 static 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
Sha256_WriteByteBlock(CSha256 * p)149 static 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
Sha256_Update(CSha256 * p,const Byte * data,size_t size)162 void 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
Sha256_Final(CSha256 * p,Byte * digest)178 void 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 }
207