Slightly modified MD5 lib. Allows access to raw binary instead of hexadecimal ascii.
md5.c@0:56e31f50f1e0, 2011-06-19 (annotated)
- Committer:
- Remco
- Date:
- Sun Jun 19 16:26:54 2011 +0000
- Revision:
- 0:56e31f50f1e0
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
Remco | 0:56e31f50f1e0 | 1 | /* MD5 |
Remco | 0:56e31f50f1e0 | 2 | converted to C++ class by Frank Thilo (thilo@unix-ag.org) |
Remco | 0:56e31f50f1e0 | 3 | for bzflag (http://www.bzflag.org) |
Remco | 0:56e31f50f1e0 | 4 | |
Remco | 0:56e31f50f1e0 | 5 | based on: |
Remco | 0:56e31f50f1e0 | 6 | |
Remco | 0:56e31f50f1e0 | 7 | md5.h and md5.c |
Remco | 0:56e31f50f1e0 | 8 | reference implemantion of RFC 1321 |
Remco | 0:56e31f50f1e0 | 9 | |
Remco | 0:56e31f50f1e0 | 10 | Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All |
Remco | 0:56e31f50f1e0 | 11 | rights reserved. |
Remco | 0:56e31f50f1e0 | 12 | |
Remco | 0:56e31f50f1e0 | 13 | License to copy and use this software is granted provided that it |
Remco | 0:56e31f50f1e0 | 14 | is identified as the "RSA Data Security, Inc. MD5 Message-Digest |
Remco | 0:56e31f50f1e0 | 15 | Algorithm" in all material mentioning or referencing this software |
Remco | 0:56e31f50f1e0 | 16 | or this function. |
Remco | 0:56e31f50f1e0 | 17 | |
Remco | 0:56e31f50f1e0 | 18 | License is also granted to make and use derivative works provided |
Remco | 0:56e31f50f1e0 | 19 | that such works are identified as "derived from the RSA Data |
Remco | 0:56e31f50f1e0 | 20 | Security, Inc. MD5 Message-Digest Algorithm" in all material |
Remco | 0:56e31f50f1e0 | 21 | mentioning or referencing the derived work. |
Remco | 0:56e31f50f1e0 | 22 | |
Remco | 0:56e31f50f1e0 | 23 | RSA Data Security, Inc. makes no representations concerning either |
Remco | 0:56e31f50f1e0 | 24 | the merchantability of this software or the suitability of this |
Remco | 0:56e31f50f1e0 | 25 | software for any particular purpose. It is provided "as is" |
Remco | 0:56e31f50f1e0 | 26 | without express or implied warranty of any kind. |
Remco | 0:56e31f50f1e0 | 27 | |
Remco | 0:56e31f50f1e0 | 28 | These notices must be retained in any copies of any part of this |
Remco | 0:56e31f50f1e0 | 29 | documentation and/or software. |
Remco | 0:56e31f50f1e0 | 30 | |
Remco | 0:56e31f50f1e0 | 31 | */ |
Remco | 0:56e31f50f1e0 | 32 | |
Remco | 0:56e31f50f1e0 | 33 | /* interface header */ |
Remco | 0:56e31f50f1e0 | 34 | #include "md5.h" |
Remco | 0:56e31f50f1e0 | 35 | |
Remco | 0:56e31f50f1e0 | 36 | /* system implementation headers */ |
Remco | 0:56e31f50f1e0 | 37 | #include <stdio.h> |
Remco | 0:56e31f50f1e0 | 38 | #include <string.h> |
Remco | 0:56e31f50f1e0 | 39 | |
Remco | 0:56e31f50f1e0 | 40 | |
Remco | 0:56e31f50f1e0 | 41 | // Constants for MD5Transform routine. |
Remco | 0:56e31f50f1e0 | 42 | #define S11 7 |
Remco | 0:56e31f50f1e0 | 43 | #define S12 12 |
Remco | 0:56e31f50f1e0 | 44 | #define S13 17 |
Remco | 0:56e31f50f1e0 | 45 | #define S14 22 |
Remco | 0:56e31f50f1e0 | 46 | #define S21 5 |
Remco | 0:56e31f50f1e0 | 47 | #define S22 9 |
Remco | 0:56e31f50f1e0 | 48 | #define S23 14 |
Remco | 0:56e31f50f1e0 | 49 | #define S24 20 |
Remco | 0:56e31f50f1e0 | 50 | #define S31 4 |
Remco | 0:56e31f50f1e0 | 51 | #define S32 11 |
Remco | 0:56e31f50f1e0 | 52 | #define S33 16 |
Remco | 0:56e31f50f1e0 | 53 | #define S34 23 |
Remco | 0:56e31f50f1e0 | 54 | #define S41 6 |
Remco | 0:56e31f50f1e0 | 55 | #define S42 10 |
Remco | 0:56e31f50f1e0 | 56 | #define S43 15 |
Remco | 0:56e31f50f1e0 | 57 | #define S44 21 |
Remco | 0:56e31f50f1e0 | 58 | |
Remco | 0:56e31f50f1e0 | 59 | /////////////////////////////////////////////// |
Remco | 0:56e31f50f1e0 | 60 | |
Remco | 0:56e31f50f1e0 | 61 | // F, G, H and I are basic MD5 functions. |
Remco | 0:56e31f50f1e0 | 62 | inline MD5::uint4 MD5::F(uint4 x, uint4 y, uint4 z) { |
Remco | 0:56e31f50f1e0 | 63 | return x&y | ~x&z; |
Remco | 0:56e31f50f1e0 | 64 | } |
Remco | 0:56e31f50f1e0 | 65 | |
Remco | 0:56e31f50f1e0 | 66 | inline MD5::uint4 MD5::G(uint4 x, uint4 y, uint4 z) { |
Remco | 0:56e31f50f1e0 | 67 | return x&z | y&~z; |
Remco | 0:56e31f50f1e0 | 68 | } |
Remco | 0:56e31f50f1e0 | 69 | |
Remco | 0:56e31f50f1e0 | 70 | inline MD5::uint4 MD5::H(uint4 x, uint4 y, uint4 z) { |
Remco | 0:56e31f50f1e0 | 71 | return x^y^z; |
Remco | 0:56e31f50f1e0 | 72 | } |
Remco | 0:56e31f50f1e0 | 73 | |
Remco | 0:56e31f50f1e0 | 74 | inline MD5::uint4 MD5::I(uint4 x, uint4 y, uint4 z) { |
Remco | 0:56e31f50f1e0 | 75 | return y ^ (x | ~z); |
Remco | 0:56e31f50f1e0 | 76 | } |
Remco | 0:56e31f50f1e0 | 77 | |
Remco | 0:56e31f50f1e0 | 78 | // rotate_left rotates x left n bits. |
Remco | 0:56e31f50f1e0 | 79 | inline MD5::uint4 MD5::rotate_left(uint4 x, int n) { |
Remco | 0:56e31f50f1e0 | 80 | return (x << n) | (x >> (32-n)); |
Remco | 0:56e31f50f1e0 | 81 | } |
Remco | 0:56e31f50f1e0 | 82 | |
Remco | 0:56e31f50f1e0 | 83 | // FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4. |
Remco | 0:56e31f50f1e0 | 84 | // Rotation is separate from addition to prevent recomputation. |
Remco | 0:56e31f50f1e0 | 85 | inline void MD5::FF(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) { |
Remco | 0:56e31f50f1e0 | 86 | a = rotate_left(a+ F(b,c,d) + x + ac, s) + b; |
Remco | 0:56e31f50f1e0 | 87 | } |
Remco | 0:56e31f50f1e0 | 88 | |
Remco | 0:56e31f50f1e0 | 89 | inline void MD5::GG(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) { |
Remco | 0:56e31f50f1e0 | 90 | a = rotate_left(a + G(b,c,d) + x + ac, s) + b; |
Remco | 0:56e31f50f1e0 | 91 | } |
Remco | 0:56e31f50f1e0 | 92 | |
Remco | 0:56e31f50f1e0 | 93 | inline void MD5::HH(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) { |
Remco | 0:56e31f50f1e0 | 94 | a = rotate_left(a + H(b,c,d) + x + ac, s) + b; |
Remco | 0:56e31f50f1e0 | 95 | } |
Remco | 0:56e31f50f1e0 | 96 | |
Remco | 0:56e31f50f1e0 | 97 | inline void MD5::II(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) { |
Remco | 0:56e31f50f1e0 | 98 | a = rotate_left(a + I(b,c,d) + x + ac, s) + b; |
Remco | 0:56e31f50f1e0 | 99 | } |
Remco | 0:56e31f50f1e0 | 100 | |
Remco | 0:56e31f50f1e0 | 101 | ////////////////////////////////////////////// |
Remco | 0:56e31f50f1e0 | 102 | |
Remco | 0:56e31f50f1e0 | 103 | // default ctor, just initailize |
Remco | 0:56e31f50f1e0 | 104 | MD5::MD5() |
Remco | 0:56e31f50f1e0 | 105 | { |
Remco | 0:56e31f50f1e0 | 106 | init(); |
Remco | 0:56e31f50f1e0 | 107 | } |
Remco | 0:56e31f50f1e0 | 108 | |
Remco | 0:56e31f50f1e0 | 109 | ////////////////////////////////////////////// |
Remco | 0:56e31f50f1e0 | 110 | |
Remco | 0:56e31f50f1e0 | 111 | // nifty shortcut ctor, compute MD5 for string and finalize it right away |
Remco | 0:56e31f50f1e0 | 112 | MD5::MD5(const std::string &text) |
Remco | 0:56e31f50f1e0 | 113 | { |
Remco | 0:56e31f50f1e0 | 114 | init(); |
Remco | 0:56e31f50f1e0 | 115 | update(text.c_str(), text.length()); |
Remco | 0:56e31f50f1e0 | 116 | finalize(); |
Remco | 0:56e31f50f1e0 | 117 | } |
Remco | 0:56e31f50f1e0 | 118 | |
Remco | 0:56e31f50f1e0 | 119 | ////////////////////////////// |
Remco | 0:56e31f50f1e0 | 120 | |
Remco | 0:56e31f50f1e0 | 121 | void MD5::init() |
Remco | 0:56e31f50f1e0 | 122 | { |
Remco | 0:56e31f50f1e0 | 123 | finalized=false; |
Remco | 0:56e31f50f1e0 | 124 | |
Remco | 0:56e31f50f1e0 | 125 | count[0] = 0; |
Remco | 0:56e31f50f1e0 | 126 | count[1] = 0; |
Remco | 0:56e31f50f1e0 | 127 | |
Remco | 0:56e31f50f1e0 | 128 | // load magic initialization constants. |
Remco | 0:56e31f50f1e0 | 129 | state[0] = 0x67452301; |
Remco | 0:56e31f50f1e0 | 130 | state[1] = 0xefcdab89; |
Remco | 0:56e31f50f1e0 | 131 | state[2] = 0x98badcfe; |
Remco | 0:56e31f50f1e0 | 132 | state[3] = 0x10325476; |
Remco | 0:56e31f50f1e0 | 133 | } |
Remco | 0:56e31f50f1e0 | 134 | |
Remco | 0:56e31f50f1e0 | 135 | ////////////////////////////// |
Remco | 0:56e31f50f1e0 | 136 | |
Remco | 0:56e31f50f1e0 | 137 | // decodes input (unsigned char) into output (uint4). Assumes len is a multiple of 4. |
Remco | 0:56e31f50f1e0 | 138 | void MD5::decode(uint4 output[], const uint1 input[], size_type len) |
Remco | 0:56e31f50f1e0 | 139 | { |
Remco | 0:56e31f50f1e0 | 140 | for (unsigned int i = 0, j = 0; j < len; i++, j += 4) |
Remco | 0:56e31f50f1e0 | 141 | output[i] = ((uint4)input[j]) | (((uint4)input[j+1]) << 8) | |
Remco | 0:56e31f50f1e0 | 142 | (((uint4)input[j+2]) << 16) | (((uint4)input[j+3]) << 24); |
Remco | 0:56e31f50f1e0 | 143 | } |
Remco | 0:56e31f50f1e0 | 144 | |
Remco | 0:56e31f50f1e0 | 145 | ////////////////////////////// |
Remco | 0:56e31f50f1e0 | 146 | |
Remco | 0:56e31f50f1e0 | 147 | // encodes input (uint4) into output (unsigned char). Assumes len is |
Remco | 0:56e31f50f1e0 | 148 | // a multiple of 4. |
Remco | 0:56e31f50f1e0 | 149 | void MD5::encode(uint1 output[], const uint4 input[], size_type len) |
Remco | 0:56e31f50f1e0 | 150 | { |
Remco | 0:56e31f50f1e0 | 151 | for (size_type i = 0, j = 0; j < len; i++, j += 4) { |
Remco | 0:56e31f50f1e0 | 152 | output[j] = input[i] & 0xff; |
Remco | 0:56e31f50f1e0 | 153 | output[j+1] = (input[i] >> 8) & 0xff; |
Remco | 0:56e31f50f1e0 | 154 | output[j+2] = (input[i] >> 16) & 0xff; |
Remco | 0:56e31f50f1e0 | 155 | output[j+3] = (input[i] >> 24) & 0xff; |
Remco | 0:56e31f50f1e0 | 156 | } |
Remco | 0:56e31f50f1e0 | 157 | } |
Remco | 0:56e31f50f1e0 | 158 | |
Remco | 0:56e31f50f1e0 | 159 | ////////////////////////////// |
Remco | 0:56e31f50f1e0 | 160 | |
Remco | 0:56e31f50f1e0 | 161 | // apply MD5 algo on a block |
Remco | 0:56e31f50f1e0 | 162 | void MD5::transform(const uint1 block[blocksize]) |
Remco | 0:56e31f50f1e0 | 163 | { |
Remco | 0:56e31f50f1e0 | 164 | uint4 a = state[0], b = state[1], c = state[2], d = state[3], x[16]; |
Remco | 0:56e31f50f1e0 | 165 | decode (x, block, blocksize); |
Remco | 0:56e31f50f1e0 | 166 | |
Remco | 0:56e31f50f1e0 | 167 | /* Round 1 */ |
Remco | 0:56e31f50f1e0 | 168 | FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */ |
Remco | 0:56e31f50f1e0 | 169 | FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */ |
Remco | 0:56e31f50f1e0 | 170 | FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */ |
Remco | 0:56e31f50f1e0 | 171 | FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */ |
Remco | 0:56e31f50f1e0 | 172 | FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */ |
Remco | 0:56e31f50f1e0 | 173 | FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */ |
Remco | 0:56e31f50f1e0 | 174 | FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */ |
Remco | 0:56e31f50f1e0 | 175 | FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */ |
Remco | 0:56e31f50f1e0 | 176 | FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */ |
Remco | 0:56e31f50f1e0 | 177 | FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */ |
Remco | 0:56e31f50f1e0 | 178 | FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */ |
Remco | 0:56e31f50f1e0 | 179 | FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */ |
Remco | 0:56e31f50f1e0 | 180 | FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */ |
Remco | 0:56e31f50f1e0 | 181 | FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */ |
Remco | 0:56e31f50f1e0 | 182 | FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */ |
Remco | 0:56e31f50f1e0 | 183 | FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */ |
Remco | 0:56e31f50f1e0 | 184 | |
Remco | 0:56e31f50f1e0 | 185 | /* Round 2 */ |
Remco | 0:56e31f50f1e0 | 186 | GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */ |
Remco | 0:56e31f50f1e0 | 187 | GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */ |
Remco | 0:56e31f50f1e0 | 188 | GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */ |
Remco | 0:56e31f50f1e0 | 189 | GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */ |
Remco | 0:56e31f50f1e0 | 190 | GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */ |
Remco | 0:56e31f50f1e0 | 191 | GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */ |
Remco | 0:56e31f50f1e0 | 192 | GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */ |
Remco | 0:56e31f50f1e0 | 193 | GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */ |
Remco | 0:56e31f50f1e0 | 194 | GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */ |
Remco | 0:56e31f50f1e0 | 195 | GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */ |
Remco | 0:56e31f50f1e0 | 196 | GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */ |
Remco | 0:56e31f50f1e0 | 197 | GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */ |
Remco | 0:56e31f50f1e0 | 198 | GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */ |
Remco | 0:56e31f50f1e0 | 199 | GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */ |
Remco | 0:56e31f50f1e0 | 200 | GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */ |
Remco | 0:56e31f50f1e0 | 201 | GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */ |
Remco | 0:56e31f50f1e0 | 202 | |
Remco | 0:56e31f50f1e0 | 203 | /* Round 3 */ |
Remco | 0:56e31f50f1e0 | 204 | HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */ |
Remco | 0:56e31f50f1e0 | 205 | HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */ |
Remco | 0:56e31f50f1e0 | 206 | HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */ |
Remco | 0:56e31f50f1e0 | 207 | HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */ |
Remco | 0:56e31f50f1e0 | 208 | HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */ |
Remco | 0:56e31f50f1e0 | 209 | HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */ |
Remco | 0:56e31f50f1e0 | 210 | HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */ |
Remco | 0:56e31f50f1e0 | 211 | HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */ |
Remco | 0:56e31f50f1e0 | 212 | HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */ |
Remco | 0:56e31f50f1e0 | 213 | HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */ |
Remco | 0:56e31f50f1e0 | 214 | HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */ |
Remco | 0:56e31f50f1e0 | 215 | HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */ |
Remco | 0:56e31f50f1e0 | 216 | HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */ |
Remco | 0:56e31f50f1e0 | 217 | HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */ |
Remco | 0:56e31f50f1e0 | 218 | HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */ |
Remco | 0:56e31f50f1e0 | 219 | HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */ |
Remco | 0:56e31f50f1e0 | 220 | |
Remco | 0:56e31f50f1e0 | 221 | /* Round 4 */ |
Remco | 0:56e31f50f1e0 | 222 | II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */ |
Remco | 0:56e31f50f1e0 | 223 | II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */ |
Remco | 0:56e31f50f1e0 | 224 | II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */ |
Remco | 0:56e31f50f1e0 | 225 | II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */ |
Remco | 0:56e31f50f1e0 | 226 | II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */ |
Remco | 0:56e31f50f1e0 | 227 | II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */ |
Remco | 0:56e31f50f1e0 | 228 | II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */ |
Remco | 0:56e31f50f1e0 | 229 | II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */ |
Remco | 0:56e31f50f1e0 | 230 | II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */ |
Remco | 0:56e31f50f1e0 | 231 | II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */ |
Remco | 0:56e31f50f1e0 | 232 | II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */ |
Remco | 0:56e31f50f1e0 | 233 | II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */ |
Remco | 0:56e31f50f1e0 | 234 | II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */ |
Remco | 0:56e31f50f1e0 | 235 | II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */ |
Remco | 0:56e31f50f1e0 | 236 | II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */ |
Remco | 0:56e31f50f1e0 | 237 | II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */ |
Remco | 0:56e31f50f1e0 | 238 | |
Remco | 0:56e31f50f1e0 | 239 | state[0] += a; |
Remco | 0:56e31f50f1e0 | 240 | state[1] += b; |
Remco | 0:56e31f50f1e0 | 241 | state[2] += c; |
Remco | 0:56e31f50f1e0 | 242 | state[3] += d; |
Remco | 0:56e31f50f1e0 | 243 | |
Remco | 0:56e31f50f1e0 | 244 | // Zeroize sensitive information. |
Remco | 0:56e31f50f1e0 | 245 | memset(x, 0, sizeof x); |
Remco | 0:56e31f50f1e0 | 246 | } |
Remco | 0:56e31f50f1e0 | 247 | |
Remco | 0:56e31f50f1e0 | 248 | ////////////////////////////// |
Remco | 0:56e31f50f1e0 | 249 | |
Remco | 0:56e31f50f1e0 | 250 | // MD5 block update operation. Continues an MD5 message-digest |
Remco | 0:56e31f50f1e0 | 251 | // operation, processing another message block |
Remco | 0:56e31f50f1e0 | 252 | void MD5::update(const unsigned char input[], size_type length) |
Remco | 0:56e31f50f1e0 | 253 | { |
Remco | 0:56e31f50f1e0 | 254 | // compute number of bytes mod 64 |
Remco | 0:56e31f50f1e0 | 255 | size_type index = count[0] / 8 % blocksize; |
Remco | 0:56e31f50f1e0 | 256 | |
Remco | 0:56e31f50f1e0 | 257 | // Update number of bits |
Remco | 0:56e31f50f1e0 | 258 | if ((count[0] += (length << 3)) < (length << 3)) |
Remco | 0:56e31f50f1e0 | 259 | count[1]++; |
Remco | 0:56e31f50f1e0 | 260 | count[1] += (length >> 29); |
Remco | 0:56e31f50f1e0 | 261 | |
Remco | 0:56e31f50f1e0 | 262 | // number of bytes we need to fill in buffer |
Remco | 0:56e31f50f1e0 | 263 | size_type firstpart = 64 - index; |
Remco | 0:56e31f50f1e0 | 264 | |
Remco | 0:56e31f50f1e0 | 265 | size_type i; |
Remco | 0:56e31f50f1e0 | 266 | |
Remco | 0:56e31f50f1e0 | 267 | // transform as many times as possible. |
Remco | 0:56e31f50f1e0 | 268 | if (length >= firstpart) |
Remco | 0:56e31f50f1e0 | 269 | { |
Remco | 0:56e31f50f1e0 | 270 | // fill buffer first, transform |
Remco | 0:56e31f50f1e0 | 271 | memcpy(&buffer[index], input, firstpart); |
Remco | 0:56e31f50f1e0 | 272 | transform(buffer); |
Remco | 0:56e31f50f1e0 | 273 | |
Remco | 0:56e31f50f1e0 | 274 | // transform chunks of blocksize (64 bytes) |
Remco | 0:56e31f50f1e0 | 275 | for (i = firstpart; i + blocksize <= length; i += blocksize) |
Remco | 0:56e31f50f1e0 | 276 | transform(&input[i]); |
Remco | 0:56e31f50f1e0 | 277 | |
Remco | 0:56e31f50f1e0 | 278 | index = 0; |
Remco | 0:56e31f50f1e0 | 279 | } |
Remco | 0:56e31f50f1e0 | 280 | else |
Remco | 0:56e31f50f1e0 | 281 | i = 0; |
Remco | 0:56e31f50f1e0 | 282 | |
Remco | 0:56e31f50f1e0 | 283 | // buffer remaining input |
Remco | 0:56e31f50f1e0 | 284 | memcpy(&buffer[index], &input[i], length-i); |
Remco | 0:56e31f50f1e0 | 285 | } |
Remco | 0:56e31f50f1e0 | 286 | |
Remco | 0:56e31f50f1e0 | 287 | ////////////////////////////// |
Remco | 0:56e31f50f1e0 | 288 | |
Remco | 0:56e31f50f1e0 | 289 | // for convenience provide a verson with signed char |
Remco | 0:56e31f50f1e0 | 290 | void MD5::update(const char input[], size_type length) |
Remco | 0:56e31f50f1e0 | 291 | { |
Remco | 0:56e31f50f1e0 | 292 | update((const unsigned char*)input, length); |
Remco | 0:56e31f50f1e0 | 293 | } |
Remco | 0:56e31f50f1e0 | 294 | |
Remco | 0:56e31f50f1e0 | 295 | ////////////////////////////// |
Remco | 0:56e31f50f1e0 | 296 | |
Remco | 0:56e31f50f1e0 | 297 | // MD5 finalization. Ends an MD5 message-digest operation, writing the |
Remco | 0:56e31f50f1e0 | 298 | // the message digest and zeroizing the context. |
Remco | 0:56e31f50f1e0 | 299 | MD5& MD5::finalize() |
Remco | 0:56e31f50f1e0 | 300 | { |
Remco | 0:56e31f50f1e0 | 301 | static unsigned char padding[64] = { |
Remco | 0:56e31f50f1e0 | 302 | 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
Remco | 0:56e31f50f1e0 | 303 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
Remco | 0:56e31f50f1e0 | 304 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 |
Remco | 0:56e31f50f1e0 | 305 | }; |
Remco | 0:56e31f50f1e0 | 306 | |
Remco | 0:56e31f50f1e0 | 307 | if (!finalized) { |
Remco | 0:56e31f50f1e0 | 308 | // Save number of bits |
Remco | 0:56e31f50f1e0 | 309 | unsigned char bits[8]; |
Remco | 0:56e31f50f1e0 | 310 | encode(bits, count, 8); |
Remco | 0:56e31f50f1e0 | 311 | |
Remco | 0:56e31f50f1e0 | 312 | // pad out to 56 mod 64. |
Remco | 0:56e31f50f1e0 | 313 | size_type index = count[0] / 8 % 64; |
Remco | 0:56e31f50f1e0 | 314 | size_type padLen = (index < 56) ? (56 - index) : (120 - index); |
Remco | 0:56e31f50f1e0 | 315 | update(padding, padLen); |
Remco | 0:56e31f50f1e0 | 316 | |
Remco | 0:56e31f50f1e0 | 317 | // Append length (before padding) |
Remco | 0:56e31f50f1e0 | 318 | update(bits, 8); |
Remco | 0:56e31f50f1e0 | 319 | |
Remco | 0:56e31f50f1e0 | 320 | // Store state in digest |
Remco | 0:56e31f50f1e0 | 321 | encode(digest, state, 16); |
Remco | 0:56e31f50f1e0 | 322 | |
Remco | 0:56e31f50f1e0 | 323 | // Zeroize sensitive information. |
Remco | 0:56e31f50f1e0 | 324 | memset(buffer, 0, sizeof buffer); |
Remco | 0:56e31f50f1e0 | 325 | memset(count, 0, sizeof count); |
Remco | 0:56e31f50f1e0 | 326 | |
Remco | 0:56e31f50f1e0 | 327 | finalized=true; |
Remco | 0:56e31f50f1e0 | 328 | } |
Remco | 0:56e31f50f1e0 | 329 | |
Remco | 0:56e31f50f1e0 | 330 | return *this; |
Remco | 0:56e31f50f1e0 | 331 | } |
Remco | 0:56e31f50f1e0 | 332 | |
Remco | 0:56e31f50f1e0 | 333 | ////////////////////////////// |
Remco | 0:56e31f50f1e0 | 334 | |
Remco | 0:56e31f50f1e0 | 335 | // return hex representation of digest as string |
Remco | 0:56e31f50f1e0 | 336 | std::string MD5::hexdigest() const |
Remco | 0:56e31f50f1e0 | 337 | { |
Remco | 0:56e31f50f1e0 | 338 | if (!finalized) |
Remco | 0:56e31f50f1e0 | 339 | return ""; |
Remco | 0:56e31f50f1e0 | 340 | |
Remco | 0:56e31f50f1e0 | 341 | char buf[33]; |
Remco | 0:56e31f50f1e0 | 342 | for (int i=0; i<16; i++) |
Remco | 0:56e31f50f1e0 | 343 | sprintf(buf+i*2, "%02x", digest[i]); |
Remco | 0:56e31f50f1e0 | 344 | buf[32]=0; |
Remco | 0:56e31f50f1e0 | 345 | |
Remco | 0:56e31f50f1e0 | 346 | return std::string(buf); |
Remco | 0:56e31f50f1e0 | 347 | } |
Remco | 0:56e31f50f1e0 | 348 | |
Remco | 0:56e31f50f1e0 | 349 | ////////////////////////////// |
Remco | 0:56e31f50f1e0 | 350 | |
Remco | 0:56e31f50f1e0 | 351 | std::string md5(const std::string str) |
Remco | 0:56e31f50f1e0 | 352 | { |
Remco | 0:56e31f50f1e0 | 353 | MD5 md5 = MD5(str); |
Remco | 0:56e31f50f1e0 | 354 | |
Remco | 0:56e31f50f1e0 | 355 | return md5.hexdigest(); |
Remco | 0:56e31f50f1e0 | 356 | } |