This library implements some hash and cryptographic algorithms.
Dependents: ES_CW2_Starter_JIN EMBEDDED_CW2 EMBEDDED_CW2_Final Spinnybois ... more
Fork of Crypto by
SHA2_32.cpp@2:473bac39ae7c, 2013-09-09 (annotated)
- Committer:
- feb11
- Date:
- Mon Sep 09 16:16:24 2013 +0000
- Revision:
- 2:473bac39ae7c
- Parent:
- 0:7a1237bd2d13
- Child:
- 3:85c6ee25cf3e
improved performance of MD2
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
feb11 | 0:7a1237bd2d13 | 1 | #include "SHA2_32.h" |
feb11 | 0:7a1237bd2d13 | 2 | #include <string.h> |
feb11 | 0:7a1237bd2d13 | 3 | #include <stdio.h> |
feb11 | 0:7a1237bd2d13 | 4 | #include <stdlib.h> |
feb11 | 0:7a1237bd2d13 | 5 | |
feb11 | 0:7a1237bd2d13 | 6 | static const uint32_t K[] = |
feb11 | 0:7a1237bd2d13 | 7 | { |
feb11 | 0:7a1237bd2d13 | 8 | 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, |
feb11 | 0:7a1237bd2d13 | 9 | 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, |
feb11 | 0:7a1237bd2d13 | 10 | 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, |
feb11 | 0:7a1237bd2d13 | 11 | 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, |
feb11 | 0:7a1237bd2d13 | 12 | 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, |
feb11 | 0:7a1237bd2d13 | 13 | 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, |
feb11 | 0:7a1237bd2d13 | 14 | 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, |
feb11 | 0:7a1237bd2d13 | 15 | 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967, |
feb11 | 0:7a1237bd2d13 | 16 | 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, |
feb11 | 0:7a1237bd2d13 | 17 | 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, |
feb11 | 0:7a1237bd2d13 | 18 | 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, |
feb11 | 0:7a1237bd2d13 | 19 | 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, |
feb11 | 0:7a1237bd2d13 | 20 | 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, |
feb11 | 0:7a1237bd2d13 | 21 | 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3, |
feb11 | 0:7a1237bd2d13 | 22 | 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, |
feb11 | 0:7a1237bd2d13 | 23 | 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2 |
feb11 | 0:7a1237bd2d13 | 24 | }; |
feb11 | 0:7a1237bd2d13 | 25 | |
feb11 | 0:7a1237bd2d13 | 26 | static uint32_t rotLeft(uint32_t w, uint8_t n) |
feb11 | 0:7a1237bd2d13 | 27 | { |
feb11 | 0:7a1237bd2d13 | 28 | return (w << n) | (w >> (32-n)); |
feb11 | 0:7a1237bd2d13 | 29 | } |
feb11 | 0:7a1237bd2d13 | 30 | |
feb11 | 0:7a1237bd2d13 | 31 | static uint32_t rotRight(uint32_t w, uint8_t n) |
feb11 | 0:7a1237bd2d13 | 32 | { |
feb11 | 0:7a1237bd2d13 | 33 | return rotLeft(w,32-n); |
feb11 | 0:7a1237bd2d13 | 34 | } |
feb11 | 0:7a1237bd2d13 | 35 | |
feb11 | 0:7a1237bd2d13 | 36 | static uint32_t CH(uint32_t x, uint32_t y, uint32_t z) |
feb11 | 0:7a1237bd2d13 | 37 | { |
feb11 | 0:7a1237bd2d13 | 38 | return (x & y) ^ ((~x) & z); |
feb11 | 0:7a1237bd2d13 | 39 | } |
feb11 | 0:7a1237bd2d13 | 40 | |
feb11 | 0:7a1237bd2d13 | 41 | static uint32_t MAJ(uint32_t x, uint32_t y, uint32_t z) |
feb11 | 0:7a1237bd2d13 | 42 | { |
feb11 | 0:7a1237bd2d13 | 43 | return (x & y) ^ (x & z) ^ (y & z); |
feb11 | 0:7a1237bd2d13 | 44 | } |
feb11 | 0:7a1237bd2d13 | 45 | |
feb11 | 0:7a1237bd2d13 | 46 | static uint32_t BSIG0(uint32_t x) |
feb11 | 0:7a1237bd2d13 | 47 | { |
feb11 | 0:7a1237bd2d13 | 48 | return rotRight(x,2) ^ rotRight(x,13) ^ rotRight(x,22); |
feb11 | 0:7a1237bd2d13 | 49 | } |
feb11 | 0:7a1237bd2d13 | 50 | |
feb11 | 0:7a1237bd2d13 | 51 | static uint32_t BSIG1(uint32_t x) |
feb11 | 0:7a1237bd2d13 | 52 | { |
feb11 | 0:7a1237bd2d13 | 53 | return rotRight(x,6) ^ rotRight(x,11) ^ rotRight(x,25); |
feb11 | 0:7a1237bd2d13 | 54 | } |
feb11 | 0:7a1237bd2d13 | 55 | |
feb11 | 0:7a1237bd2d13 | 56 | static uint32_t SSIG0(uint32_t x) |
feb11 | 0:7a1237bd2d13 | 57 | { |
feb11 | 0:7a1237bd2d13 | 58 | return rotRight(x,7) ^ rotRight(x,18) ^ (x >> 3); |
feb11 | 0:7a1237bd2d13 | 59 | } |
feb11 | 0:7a1237bd2d13 | 60 | |
feb11 | 0:7a1237bd2d13 | 61 | static uint32_t SSIG1(uint32_t x) |
feb11 | 0:7a1237bd2d13 | 62 | { |
feb11 | 0:7a1237bd2d13 | 63 | return rotRight(x,17) ^ rotRight(x,19) ^ (x >> 10); |
feb11 | 0:7a1237bd2d13 | 64 | } |
feb11 | 0:7a1237bd2d13 | 65 | |
feb11 | 0:7a1237bd2d13 | 66 | |
feb11 | 0:7a1237bd2d13 | 67 | static const uint32_t H[] = |
feb11 | 0:7a1237bd2d13 | 68 | { |
feb11 | 0:7a1237bd2d13 | 69 | // SHA-224 |
feb11 | 0:7a1237bd2d13 | 70 | 0xc1059ed8, 0x367cd507, 0x3070dd17, 0xf70e5939, |
feb11 | 0:7a1237bd2d13 | 71 | 0xffc00b31, 0x68581511, 0x64f98fa7, 0xbefa4fa4, |
feb11 | 0:7a1237bd2d13 | 72 | |
feb11 | 0:7a1237bd2d13 | 73 | // SHA-256 |
feb11 | 0:7a1237bd2d13 | 74 | 0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, |
feb11 | 0:7a1237bd2d13 | 75 | 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19 |
feb11 | 0:7a1237bd2d13 | 76 | }; |
feb11 | 0:7a1237bd2d13 | 77 | |
feb11 | 0:7a1237bd2d13 | 78 | SHA2_32::SHA2_32(SHA_32_TYPE t): |
feb11 | 0:7a1237bd2d13 | 79 | type(t), |
feb11 | 0:7a1237bd2d13 | 80 | totalBufferLength(0), |
feb11 | 0:7a1237bd2d13 | 81 | bufferLength(0) |
feb11 | 0:7a1237bd2d13 | 82 | { |
feb11 | 0:7a1237bd2d13 | 83 | switch(type) |
feb11 | 0:7a1237bd2d13 | 84 | { |
feb11 | 0:7a1237bd2d13 | 85 | case SHA_224: |
feb11 | 0:7a1237bd2d13 | 86 | h0 = H[0]; |
feb11 | 0:7a1237bd2d13 | 87 | h1 = H[1]; |
feb11 | 0:7a1237bd2d13 | 88 | h2 = H[2]; |
feb11 | 0:7a1237bd2d13 | 89 | h3 = H[3]; |
feb11 | 0:7a1237bd2d13 | 90 | h4 = H[4]; |
feb11 | 0:7a1237bd2d13 | 91 | h5 = H[5]; |
feb11 | 0:7a1237bd2d13 | 92 | h6 = H[6]; |
feb11 | 0:7a1237bd2d13 | 93 | h7 = H[7]; |
feb11 | 0:7a1237bd2d13 | 94 | break; |
feb11 | 0:7a1237bd2d13 | 95 | |
feb11 | 0:7a1237bd2d13 | 96 | case SHA_256: |
feb11 | 0:7a1237bd2d13 | 97 | h0 = H[8]; |
feb11 | 0:7a1237bd2d13 | 98 | h1 = H[9]; |
feb11 | 0:7a1237bd2d13 | 99 | h2 = H[10]; |
feb11 | 0:7a1237bd2d13 | 100 | h3 = H[11]; |
feb11 | 0:7a1237bd2d13 | 101 | h4 = H[12]; |
feb11 | 0:7a1237bd2d13 | 102 | h5 = H[13]; |
feb11 | 0:7a1237bd2d13 | 103 | h6 = H[14]; |
feb11 | 0:7a1237bd2d13 | 104 | h7 = H[15]; |
feb11 | 0:7a1237bd2d13 | 105 | break; |
feb11 | 0:7a1237bd2d13 | 106 | } |
feb11 | 0:7a1237bd2d13 | 107 | } |
feb11 | 0:7a1237bd2d13 | 108 | |
feb11 | 0:7a1237bd2d13 | 109 | void SHA2_32::add(uint8_t *in, uint32_t length) |
feb11 | 0:7a1237bd2d13 | 110 | { |
feb11 | 0:7a1237bd2d13 | 111 | if(length < 64-bufferLength) |
feb11 | 0:7a1237bd2d13 | 112 | { |
feb11 | 0:7a1237bd2d13 | 113 | memcpy(&buffer[bufferLength], in, length); |
feb11 | 0:7a1237bd2d13 | 114 | bufferLength += length; |
feb11 | 0:7a1237bd2d13 | 115 | totalBufferLength += length; |
feb11 | 0:7a1237bd2d13 | 116 | return; |
feb11 | 0:7a1237bd2d13 | 117 | } |
feb11 | 0:7a1237bd2d13 | 118 | int offset = 64-bufferLength; |
feb11 | 0:7a1237bd2d13 | 119 | memcpy(&buffer[bufferLength], in, offset); |
feb11 | 0:7a1237bd2d13 | 120 | computeBlock(&h0,&h1,&h2,&h3,&h4,&h5,&h6,&h7,buffer); |
feb11 | 0:7a1237bd2d13 | 121 | while(length-offset > 64) |
feb11 | 0:7a1237bd2d13 | 122 | { |
feb11 | 0:7a1237bd2d13 | 123 | memcpy(buffer, &in[offset], 64); |
feb11 | 0:7a1237bd2d13 | 124 | computeBlock(&h0,&h1,&h2,&h3,&h4,&h5,&h6,&h7,buffer); |
feb11 | 0:7a1237bd2d13 | 125 | offset += 64; |
feb11 | 0:7a1237bd2d13 | 126 | } |
feb11 | 0:7a1237bd2d13 | 127 | if(offset > length) |
feb11 | 0:7a1237bd2d13 | 128 | offset -= 64; |
feb11 | 0:7a1237bd2d13 | 129 | bufferLength = length - offset; |
feb11 | 0:7a1237bd2d13 | 130 | memcpy(buffer, &in[offset], bufferLength); |
feb11 | 0:7a1237bd2d13 | 131 | totalBufferLength += length; |
feb11 | 0:7a1237bd2d13 | 132 | } |
feb11 | 0:7a1237bd2d13 | 133 | |
feb11 | 0:7a1237bd2d13 | 134 | void SHA2_32::computeDigest(uint8_t *digest) |
feb11 | 0:7a1237bd2d13 | 135 | { |
feb11 | 0:7a1237bd2d13 | 136 | uint16_t padding; |
feb11 | 0:7a1237bd2d13 | 137 | if(totalBufferLength % 64 < 56) |
feb11 | 0:7a1237bd2d13 | 138 | padding = 56 - (totalBufferLength % 64); |
feb11 | 0:7a1237bd2d13 | 139 | else |
feb11 | 0:7a1237bd2d13 | 140 | padding = 56 + (64 - (totalBufferLength % 64)); |
feb11 | 0:7a1237bd2d13 | 141 | uint8_t val = 0x80; |
feb11 | 0:7a1237bd2d13 | 142 | add(&val, 1); |
feb11 | 0:7a1237bd2d13 | 143 | val = 0; |
feb11 | 0:7a1237bd2d13 | 144 | for(int i = 0; i < padding-1; ++i) |
feb11 | 0:7a1237bd2d13 | 145 | add(&val,1); |
feb11 | 0:7a1237bd2d13 | 146 | totalBufferLength -= padding; |
feb11 | 0:7a1237bd2d13 | 147 | uint64_t lengthBit = totalBufferLength * 8; |
feb11 | 0:7a1237bd2d13 | 148 | uint32_t lengthBitLow = lengthBit; |
feb11 | 0:7a1237bd2d13 | 149 | uint32_t lengthBitHigh = lengthBit >> 32; |
feb11 | 0:7a1237bd2d13 | 150 | uint8_t tmp[4]; |
feb11 | 0:7a1237bd2d13 | 151 | tmp[0] = lengthBitHigh >> 24; |
feb11 | 0:7a1237bd2d13 | 152 | tmp[1] = lengthBitHigh >> 16; |
feb11 | 0:7a1237bd2d13 | 153 | tmp[2] = lengthBitHigh >> 8; |
feb11 | 0:7a1237bd2d13 | 154 | tmp[3] = lengthBitHigh; |
feb11 | 0:7a1237bd2d13 | 155 | add(tmp, 4); |
feb11 | 0:7a1237bd2d13 | 156 | tmp[0] = lengthBitLow >> 24; |
feb11 | 0:7a1237bd2d13 | 157 | tmp[1] = lengthBitLow >> 16; |
feb11 | 0:7a1237bd2d13 | 158 | tmp[2] = lengthBitLow >> 8; |
feb11 | 0:7a1237bd2d13 | 159 | tmp[3] = lengthBitLow; |
feb11 | 0:7a1237bd2d13 | 160 | add(tmp, 4); |
feb11 | 0:7a1237bd2d13 | 161 | |
feb11 | 0:7a1237bd2d13 | 162 | digest[0] = h0 >> 24; |
feb11 | 0:7a1237bd2d13 | 163 | digest[1] = h0 >> 16; |
feb11 | 0:7a1237bd2d13 | 164 | digest[2] = h0 >> 8; |
feb11 | 0:7a1237bd2d13 | 165 | digest[3] = h0; |
feb11 | 0:7a1237bd2d13 | 166 | digest[4] = h1 >> 24; |
feb11 | 0:7a1237bd2d13 | 167 | digest[5] = h1 >> 16; |
feb11 | 0:7a1237bd2d13 | 168 | digest[6] = h1 >> 8; |
feb11 | 0:7a1237bd2d13 | 169 | digest[7] = h1; |
feb11 | 0:7a1237bd2d13 | 170 | digest[8] = h2 >> 24; |
feb11 | 0:7a1237bd2d13 | 171 | digest[9] = h2 >> 16; |
feb11 | 0:7a1237bd2d13 | 172 | digest[10] = h2 >> 8; |
feb11 | 0:7a1237bd2d13 | 173 | digest[11] = h2; |
feb11 | 0:7a1237bd2d13 | 174 | digest[12] = h3 >> 24; |
feb11 | 0:7a1237bd2d13 | 175 | digest[13] = h3 >> 16; |
feb11 | 0:7a1237bd2d13 | 176 | digest[14] = h3 >> 8; |
feb11 | 0:7a1237bd2d13 | 177 | digest[15] = h3; |
feb11 | 0:7a1237bd2d13 | 178 | digest[16] = h4 >> 24; |
feb11 | 0:7a1237bd2d13 | 179 | digest[17] = h4 >> 16; |
feb11 | 0:7a1237bd2d13 | 180 | digest[18] = h4 >> 8; |
feb11 | 0:7a1237bd2d13 | 181 | digest[19] = h4; |
feb11 | 0:7a1237bd2d13 | 182 | digest[20] = h5 >> 24; |
feb11 | 0:7a1237bd2d13 | 183 | digest[21] = h5 >> 16; |
feb11 | 0:7a1237bd2d13 | 184 | digest[22] = h5 >> 8; |
feb11 | 0:7a1237bd2d13 | 185 | digest[23] = h5; |
feb11 | 0:7a1237bd2d13 | 186 | digest[24] = h6 >> 24; |
feb11 | 0:7a1237bd2d13 | 187 | digest[25] = h6 >> 16; |
feb11 | 0:7a1237bd2d13 | 188 | digest[26] = h6 >> 8; |
feb11 | 0:7a1237bd2d13 | 189 | digest[27] = h6; |
feb11 | 0:7a1237bd2d13 | 190 | |
feb11 | 0:7a1237bd2d13 | 191 | if(type == SHA_256) |
feb11 | 0:7a1237bd2d13 | 192 | { |
feb11 | 0:7a1237bd2d13 | 193 | digest[28] = h7 >> 24; |
feb11 | 0:7a1237bd2d13 | 194 | digest[29] = h7 >> 16; |
feb11 | 0:7a1237bd2d13 | 195 | digest[30] = h7 >> 8; |
feb11 | 0:7a1237bd2d13 | 196 | digest[31] = h7; |
feb11 | 0:7a1237bd2d13 | 197 | } |
feb11 | 0:7a1237bd2d13 | 198 | |
feb11 | 0:7a1237bd2d13 | 199 | // reset state |
feb11 | 0:7a1237bd2d13 | 200 | switch(type) |
feb11 | 0:7a1237bd2d13 | 201 | { |
feb11 | 0:7a1237bd2d13 | 202 | case SHA_224: |
feb11 | 0:7a1237bd2d13 | 203 | h0 = H[0]; |
feb11 | 0:7a1237bd2d13 | 204 | h1 = H[1]; |
feb11 | 0:7a1237bd2d13 | 205 | h2 = H[2]; |
feb11 | 0:7a1237bd2d13 | 206 | h3 = H[3]; |
feb11 | 0:7a1237bd2d13 | 207 | h4 = H[4]; |
feb11 | 0:7a1237bd2d13 | 208 | h5 = H[5]; |
feb11 | 0:7a1237bd2d13 | 209 | h6 = H[6]; |
feb11 | 0:7a1237bd2d13 | 210 | h7 = H[7]; |
feb11 | 0:7a1237bd2d13 | 211 | break; |
feb11 | 0:7a1237bd2d13 | 212 | |
feb11 | 0:7a1237bd2d13 | 213 | case SHA_256: |
feb11 | 0:7a1237bd2d13 | 214 | h0 = H[8]; |
feb11 | 0:7a1237bd2d13 | 215 | h1 = H[9]; |
feb11 | 0:7a1237bd2d13 | 216 | h2 = H[10]; |
feb11 | 0:7a1237bd2d13 | 217 | h3 = H[11]; |
feb11 | 0:7a1237bd2d13 | 218 | h4 = H[12]; |
feb11 | 0:7a1237bd2d13 | 219 | h5 = H[13]; |
feb11 | 0:7a1237bd2d13 | 220 | h6 = H[14]; |
feb11 | 0:7a1237bd2d13 | 221 | h7 = H[15]; |
feb11 | 0:7a1237bd2d13 | 222 | break; |
feb11 | 0:7a1237bd2d13 | 223 | } |
feb11 | 0:7a1237bd2d13 | 224 | totalBufferLength = 0; |
feb11 | 0:7a1237bd2d13 | 225 | bufferLength = 0; |
feb11 | 0:7a1237bd2d13 | 226 | } |
feb11 | 0:7a1237bd2d13 | 227 | |
feb11 | 0:7a1237bd2d13 | 228 | void SHA2_32::computeBlock(uint32_t *h02, |
feb11 | 0:7a1237bd2d13 | 229 | uint32_t *h12, |
feb11 | 0:7a1237bd2d13 | 230 | uint32_t *h22, |
feb11 | 0:7a1237bd2d13 | 231 | uint32_t *h32, |
feb11 | 0:7a1237bd2d13 | 232 | uint32_t *h42, |
feb11 | 0:7a1237bd2d13 | 233 | uint32_t *h52, |
feb11 | 0:7a1237bd2d13 | 234 | uint32_t *h62, |
feb11 | 0:7a1237bd2d13 | 235 | uint32_t *h72, |
feb11 | 0:7a1237bd2d13 | 236 | uint8_t *buffer) |
feb11 | 0:7a1237bd2d13 | 237 | { |
feb11 | 0:7a1237bd2d13 | 238 | uint32_t w[64]; |
feb11 | 0:7a1237bd2d13 | 239 | for(int t = 0; t < 16; ++t) |
feb11 | 2:473bac39ae7c | 240 | { |
feb11 | 0:7a1237bd2d13 | 241 | w[t] = (buffer[t*4] << 24) | (buffer[t*4+1] << 16) | (buffer[t*4+2] << 8) | buffer[t*4+3]; |
feb11 | 2:473bac39ae7c | 242 | } |
feb11 | 0:7a1237bd2d13 | 243 | for(int t = 16; t < 64; ++t) |
feb11 | 0:7a1237bd2d13 | 244 | w[t] = SSIG1(w[t-2]) + w[t-7] + SSIG0(w[t-15]) + w[t-16]; |
feb11 | 0:7a1237bd2d13 | 245 | |
feb11 | 0:7a1237bd2d13 | 246 | uint32_t a = *h02, b = *h12, c = *h22, d = *h32, e = *h42, f = *h52, g = *h62, h = *h72; |
feb11 | 0:7a1237bd2d13 | 247 | for(int t = 0; t < 64; ++t) |
feb11 | 0:7a1237bd2d13 | 248 | { |
feb11 | 0:7a1237bd2d13 | 249 | uint32_t T1 = h + BSIG1(e) + CH(e,f,g) + K[t] + w[t]; |
feb11 | 0:7a1237bd2d13 | 250 | uint32_t T2 = BSIG0(a) + MAJ(a,b,c); |
feb11 | 0:7a1237bd2d13 | 251 | h = g; |
feb11 | 0:7a1237bd2d13 | 252 | g = f; |
feb11 | 0:7a1237bd2d13 | 253 | f = e; |
feb11 | 0:7a1237bd2d13 | 254 | e = d + T1; |
feb11 | 0:7a1237bd2d13 | 255 | d = c; |
feb11 | 0:7a1237bd2d13 | 256 | c = b; |
feb11 | 0:7a1237bd2d13 | 257 | b = a; |
feb11 | 0:7a1237bd2d13 | 258 | a = T1 + T2; |
feb11 | 0:7a1237bd2d13 | 259 | } |
feb11 | 0:7a1237bd2d13 | 260 | |
feb11 | 0:7a1237bd2d13 | 261 | *h02 += a; |
feb11 | 0:7a1237bd2d13 | 262 | *h12 += b; |
feb11 | 0:7a1237bd2d13 | 263 | *h22 += c; |
feb11 | 0:7a1237bd2d13 | 264 | *h32 += d; |
feb11 | 0:7a1237bd2d13 | 265 | *h42 += e; |
feb11 | 0:7a1237bd2d13 | 266 | *h52 += f; |
feb11 | 0:7a1237bd2d13 | 267 | *h62 += g; |
feb11 | 0:7a1237bd2d13 | 268 | *h72 += h; |
feb11 | 0:7a1237bd2d13 | 269 | } |
feb11 | 0:7a1237bd2d13 | 270 | |
feb11 | 0:7a1237bd2d13 | 271 | void SHA2_32::computeDigest(SHA_32_TYPE type, uint8_t *digest, uint8_t *in, uint32_t length) |
feb11 | 0:7a1237bd2d13 | 272 | { |
feb11 | 0:7a1237bd2d13 | 273 | uint32_t h0 = H[type*8], h1 = H[type*8+1], h2 = H[type*8+2], h3 = H[type*8+3]; |
feb11 | 0:7a1237bd2d13 | 274 | uint32_t h4 = H[type*8+4], h5 = H[type*8+5], h6 = H[type*8+6], h7 = H[type*8+7]; |
feb11 | 0:7a1237bd2d13 | 275 | int offset = 0; |
feb11 | 0:7a1237bd2d13 | 276 | while(length - offset >= 64) |
feb11 | 0:7a1237bd2d13 | 277 | { |
feb11 | 0:7a1237bd2d13 | 278 | computeBlock(&h0, &h1, &h2, &h3, &h4, &h5, &h6, &h7, &in[offset]); |
feb11 | 0:7a1237bd2d13 | 279 | offset += 64; |
feb11 | 0:7a1237bd2d13 | 280 | } |
feb11 | 0:7a1237bd2d13 | 281 | uint8_t bufferLength = length-offset; |
feb11 | 0:7a1237bd2d13 | 282 | uint8_t buffer[64]; |
feb11 | 0:7a1237bd2d13 | 283 | memcpy(buffer, &in[offset],bufferLength); |
feb11 | 0:7a1237bd2d13 | 284 | uint16_t padding; |
feb11 | 0:7a1237bd2d13 | 285 | if(length % 64 < 56) |
feb11 | 0:7a1237bd2d13 | 286 | padding = 56 - (length % 64); |
feb11 | 0:7a1237bd2d13 | 287 | else |
feb11 | 0:7a1237bd2d13 | 288 | padding = 56 + (64 - (length % 64)); |
feb11 | 0:7a1237bd2d13 | 289 | buffer[bufferLength] = 0x80; |
feb11 | 0:7a1237bd2d13 | 290 | bufferLength++; |
feb11 | 0:7a1237bd2d13 | 291 | padding--; |
feb11 | 0:7a1237bd2d13 | 292 | while(padding > 0) |
feb11 | 0:7a1237bd2d13 | 293 | { |
feb11 | 0:7a1237bd2d13 | 294 | if(bufferLength == 64) |
feb11 | 0:7a1237bd2d13 | 295 | { |
feb11 | 0:7a1237bd2d13 | 296 | computeBlock(&h0, &h1, &h2, &h3, &h4, &h5, &h6, &h7, buffer); |
feb11 | 0:7a1237bd2d13 | 297 | bufferLength = 0; |
feb11 | 0:7a1237bd2d13 | 298 | } |
feb11 | 0:7a1237bd2d13 | 299 | buffer[bufferLength] = 0; |
feb11 | 0:7a1237bd2d13 | 300 | bufferLength++; |
feb11 | 0:7a1237bd2d13 | 301 | padding--; |
feb11 | 0:7a1237bd2d13 | 302 | } |
feb11 | 0:7a1237bd2d13 | 303 | uint64_t lengthBit = length * 8; |
feb11 | 0:7a1237bd2d13 | 304 | uint32_t lengthBitLow = lengthBit; |
feb11 | 0:7a1237bd2d13 | 305 | uint32_t lengthBitHigh = lengthBit >> 32; |
feb11 | 2:473bac39ae7c | 306 | lengthBitLow = __rev(lengthBitLow); |
feb11 | 2:473bac39ae7c | 307 | memcpy(&buffer[60], &lengthBitLow, 4); |
feb11 | 2:473bac39ae7c | 308 | lengthBitHigh = __rev(lengthBitHigh); |
feb11 | 2:473bac39ae7c | 309 | memcpy(&buffer[56], &lengthBitHigh, 4); |
feb11 | 0:7a1237bd2d13 | 310 | computeBlock(&h0, &h1, &h2, &h3, &h4, &h5, &h6, &h7, buffer); |
feb11 | 0:7a1237bd2d13 | 311 | |
feb11 | 2:473bac39ae7c | 312 | h0 = __rev(h0); |
feb11 | 2:473bac39ae7c | 313 | h1 = __rev(h1); |
feb11 | 2:473bac39ae7c | 314 | h2 = __rev(h2); |
feb11 | 2:473bac39ae7c | 315 | h3 = __rev(h3); |
feb11 | 2:473bac39ae7c | 316 | h4 = __rev(h4); |
feb11 | 2:473bac39ae7c | 317 | h5 = __rev(h5); |
feb11 | 2:473bac39ae7c | 318 | h6 = __rev(h6); |
feb11 | 2:473bac39ae7c | 319 | |
feb11 | 2:473bac39ae7c | 320 | memcpy(digest, &h0, 4); |
feb11 | 2:473bac39ae7c | 321 | memcpy(&digest[4], &h1, 4); |
feb11 | 2:473bac39ae7c | 322 | memcpy(&digest[8], &h2, 4); |
feb11 | 2:473bac39ae7c | 323 | memcpy(&digest[12], &h3, 4); |
feb11 | 2:473bac39ae7c | 324 | memcpy(&digest[16], &h4, 4); |
feb11 | 2:473bac39ae7c | 325 | memcpy(&digest[20], &h5, 4); |
feb11 | 2:473bac39ae7c | 326 | memcpy(&digest[24], &h6, 4); |
feb11 | 2:473bac39ae7c | 327 | |
feb11 | 0:7a1237bd2d13 | 328 | |
feb11 | 0:7a1237bd2d13 | 329 | if(type == SHA_256) |
feb11 | 0:7a1237bd2d13 | 330 | { |
feb11 | 2:473bac39ae7c | 331 | h7 = __rev(h7); |
feb11 | 2:473bac39ae7c | 332 | memcpy(&digest[28], &h7, 4); |
feb11 | 0:7a1237bd2d13 | 333 | } |
feb11 | 0:7a1237bd2d13 | 334 | } |