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 "RotateDefs.h"
6 #include "Sha256.h"
7
8 /* define it for speed optimization */
9 /* #define _SHA256_UNROLL */
10 /* #define _SHA256_UNROLL2 */
11
Sha256_Init(CSha256 * p)12 void 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
74 static 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
Sha256_Transform(UInt32 * state,const UInt32 * data)93 static 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
Sha256_WriteByteBlock(CSha256 * p)147 static 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
Sha256_Update(CSha256 * p,const Byte * data,size_t size)160 void 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
Sha256_Final(CSha256 * p,Byte * digest)176 void 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