repo sync | baa3858 | 2013-07-26 17:53:31 -0700 | [diff] [blame] | 1 | /* Crypto/Sha256.c -- SHA-256 Hash
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| 2 | 2010-06-11 : Igor Pavlov : Public domain
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| 3 | This code is based on public domain code from Wei Dai's Crypto++ library. */
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| 4 |
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| 5 | #include "RotateDefs.h"
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| 6 | #include "Sha256.h"
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| 7 |
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| 8 | /* define it for speed optimization */
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| 9 | /* #define _SHA256_UNROLL */
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| 10 | /* #define _SHA256_UNROLL2 */
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| 11 |
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| 12 | void Sha256_Init(CSha256 *p)
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| 13 | {
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| 14 | p->state[0] = 0x6a09e667;
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| 15 | p->state[1] = 0xbb67ae85;
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| 16 | p->state[2] = 0x3c6ef372;
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| 17 | p->state[3] = 0xa54ff53a;
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| 18 | p->state[4] = 0x510e527f;
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| 19 | p->state[5] = 0x9b05688c;
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| 20 | p->state[6] = 0x1f83d9ab;
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| 21 | p->state[7] = 0x5be0cd19;
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| 22 | p->count = 0;
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| 23 | }
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| 24 |
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| 25 | #define S0(x) (rotrFixed(x, 2) ^ rotrFixed(x,13) ^ rotrFixed(x, 22))
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| 26 | #define S1(x) (rotrFixed(x, 6) ^ rotrFixed(x,11) ^ rotrFixed(x, 25))
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| 27 | #define s0(x) (rotrFixed(x, 7) ^ rotrFixed(x,18) ^ (x >> 3))
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| 28 | #define s1(x) (rotrFixed(x,17) ^ rotrFixed(x,19) ^ (x >> 10))
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| 29 |
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| 30 | #define blk0(i) (W[i] = data[i])
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| 31 | #define blk2(i) (W[i&15] += s1(W[(i-2)&15]) + W[(i-7)&15] + s0(W[(i-15)&15]))
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| 32 |
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| 33 | #define Ch(x,y,z) (z^(x&(y^z)))
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| 34 | #define Maj(x,y,z) ((x&y)|(z&(x|y)))
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| 35 |
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| 36 | #define a(i) T[(0-(i))&7]
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| 37 | #define b(i) T[(1-(i))&7]
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| 38 | #define c(i) T[(2-(i))&7]
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| 39 | #define d(i) T[(3-(i))&7]
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| 40 | #define e(i) T[(4-(i))&7]
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| 41 | #define f(i) T[(5-(i))&7]
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| 42 | #define g(i) T[(6-(i))&7]
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| 43 | #define h(i) T[(7-(i))&7]
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| 44 |
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| 45 |
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| 46 | #ifdef _SHA256_UNROLL2
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| 47 |
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| 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));\
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| 49 | d += h; h += S0(a) + Maj(a, b, c)
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| 50 |
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| 51 | #define RX_8(i) \
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| 52 | R(a,b,c,d,e,f,g,h, i); \
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| 53 | R(h,a,b,c,d,e,f,g, i+1); \
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| 54 | R(g,h,a,b,c,d,e,f, i+2); \
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| 55 | R(f,g,h,a,b,c,d,e, i+3); \
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| 56 | R(e,f,g,h,a,b,c,d, i+4); \
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| 57 | R(d,e,f,g,h,a,b,c, i+5); \
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| 58 | R(c,d,e,f,g,h,a,b, i+6); \
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| 59 | R(b,c,d,e,f,g,h,a, i+7)
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| 60 |
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| 61 | #else
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| 62 |
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| 63 | #define R(i) h(i) += S1(e(i)) + Ch(e(i),f(i),g(i)) + K[i+j] + (j?blk2(i):blk0(i));\
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| 64 | d(i) += h(i); h(i) += S0(a(i)) + Maj(a(i), b(i), c(i))
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| 65 |
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| 66 | #ifdef _SHA256_UNROLL
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| 67 |
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| 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);
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| 69 |
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| 70 | #endif
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| 71 |
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| 72 | #endif
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| 73 |
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| 74 | static const UInt32 K[64] = {
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| 75 | 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
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| 76 | 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
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| 77 | 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
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| 78 | 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
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| 79 | 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
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| 80 | 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
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| 81 | 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
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| 82 | 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
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| 83 | 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
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| 84 | 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
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| 85 | 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
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| 86 | 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
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| 87 | 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
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| 88 | 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
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| 89 | 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
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| 90 | 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
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| 91 | };
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| 92 |
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| 93 | static void Sha256_Transform(UInt32 *state, const UInt32 *data)
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| 94 | {
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| 95 | UInt32 W[16];
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| 96 | unsigned j;
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| 97 | #ifdef _SHA256_UNROLL2
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| 98 | UInt32 a,b,c,d,e,f,g,h;
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| 99 | a = state[0];
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| 100 | b = state[1];
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| 101 | c = state[2];
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| 102 | d = state[3];
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| 103 | e = state[4];
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| 104 | f = state[5];
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| 105 | g = state[6];
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| 106 | h = state[7];
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| 107 | #else
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| 108 | UInt32 T[8];
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| 109 | for (j = 0; j < 8; j++)
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| 110 | T[j] = state[j];
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| 111 | #endif
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| 112 |
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| 113 | for (j = 0; j < 64; j += 16)
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| 114 | {
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| 115 | #if defined(_SHA256_UNROLL) || defined(_SHA256_UNROLL2)
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| 116 | RX_8(0); RX_8(8);
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| 117 | #else
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| 118 | unsigned i;
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| 119 | for (i = 0; i < 16; i++) { R(i); }
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| 120 | #endif
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| 121 | }
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| 122 |
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| 123 | #ifdef _SHA256_UNROLL2
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| 124 | state[0] += a;
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| 125 | state[1] += b;
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| 126 | state[2] += c;
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| 127 | state[3] += d;
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| 128 | state[4] += e;
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| 129 | state[5] += f;
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| 130 | state[6] += g;
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| 131 | state[7] += h;
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| 132 | #else
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| 133 | for (j = 0; j < 8; j++)
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| 134 | state[j] += T[j];
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| 135 | #endif
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| 136 |
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| 137 | /* Wipe variables */
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| 138 | /* memset(W, 0, sizeof(W)); */
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| 139 | /* memset(T, 0, sizeof(T)); */
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| 140 | }
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| 141 |
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| 142 | #undef S0
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| 143 | #undef S1
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| 144 | #undef s0
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| 145 | #undef s1
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| 146 |
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| 147 | static void Sha256_WriteByteBlock(CSha256 *p)
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| 148 | {
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| 149 | UInt32 data32[16];
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| 150 | unsigned i;
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| 151 | for (i = 0; i < 16; i++)
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| 152 | data32[i] =
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| 153 | ((UInt32)(p->buffer[i * 4 ]) << 24) +
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| 154 | ((UInt32)(p->buffer[i * 4 + 1]) << 16) +
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| 155 | ((UInt32)(p->buffer[i * 4 + 2]) << 8) +
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| 156 | ((UInt32)(p->buffer[i * 4 + 3]));
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| 157 | Sha256_Transform(p->state, data32);
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| 158 | }
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| 159 |
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| 160 | void Sha256_Update(CSha256 *p, const Byte *data, size_t size)
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| 161 | {
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| 162 | UInt32 curBufferPos = (UInt32)p->count & 0x3F;
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| 163 | while (size > 0)
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| 164 | {
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| 165 | p->buffer[curBufferPos++] = *data++;
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| 166 | p->count++;
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| 167 | size--;
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| 168 | if (curBufferPos == 64)
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| 169 | {
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| 170 | curBufferPos = 0;
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| 171 | Sha256_WriteByteBlock(p);
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| 172 | }
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| 173 | }
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| 174 | }
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| 175 |
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| 176 | void Sha256_Final(CSha256 *p, Byte *digest)
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| 177 | {
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| 178 | UInt64 lenInBits = (p->count << 3);
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| 179 | UInt32 curBufferPos = (UInt32)p->count & 0x3F;
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| 180 | unsigned i;
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| 181 | p->buffer[curBufferPos++] = 0x80;
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| 182 | while (curBufferPos != (64 - 8))
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| 183 | {
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| 184 | curBufferPos &= 0x3F;
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| 185 | if (curBufferPos == 0)
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| 186 | Sha256_WriteByteBlock(p);
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| 187 | p->buffer[curBufferPos++] = 0;
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| 188 | }
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| 189 | for (i = 0; i < 8; i++)
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| 190 | {
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| 191 | p->buffer[curBufferPos++] = (Byte)(lenInBits >> 56);
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| 192 | lenInBits <<= 8;
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| 193 | }
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| 194 | Sha256_WriteByteBlock(p);
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| 195 |
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| 196 | for (i = 0; i < 8; i++)
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| 197 | {
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| 198 | *digest++ = (Byte)(p->state[i] >> 24);
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| 199 | *digest++ = (Byte)(p->state[i] >> 16);
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| 200 | *digest++ = (Byte)(p->state[i] >> 8);
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| 201 | *digest++ = (Byte)(p->state[i]);
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| 202 | }
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| 203 | Sha256_Init(p);
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| 204 | }
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