Mercurial > masqmail-0.2

annotate src/md5/hmac_md5.c @ 170:0f0e4e7cd762

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added misc/list-versions This script helps to check if the versions numbers in the project are the same as the one for the release. This script is motivated by the 0.2.27 release in which masqmail introduces itself as being version 0.2.26.
author meillo@marmaro.de
date Mon, 19 Jul 2010 14:01:13 +0200
parents b8c358b2e242
children
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1 /*
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2 hmac_md5 -- implements RFC 2104
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3
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4 Copyright 2010, markus schnalke <meillo@marmaro.de>
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5
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6 Permission to use, copy, modify, and/or distribute this software for any
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7 purpose with or without fee is hereby granted, provided that the above
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8 copyright notice and this permission notice appear in all copies.
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9
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10 THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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11 WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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12 MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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13 ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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14 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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15 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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16 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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17
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18
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19 My motivation to write this code was the lack of a nicely licensed
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20 hmac_md5 function in C. I programmed it following the RFC's text.
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21 Obviously this code is highly similar to the sample code of the RFC.
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22 The code is tested against the test vectors of the RFC. Wikipedia's
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23 HMAC page helped me to understand the algorithm better.
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24
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25 This hmac_md5 function requires an OpenSSL-compatible MD5
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26 implementation. There are Public Domain MD5 implementations by Colin
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27 Plumb and by Solar Designer. You probably want to use one of these.
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28 */
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30 #include <string.h>
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31 #include "md5.h"
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34 const int blocksize = 64;
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35 const int hashsize = 16;
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38 /*
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39 The computed HMAC will be written to `digest'.
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40 Ensure digest points to hashsize bytes of allocated memory.
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41 */
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42 void
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43 hmac_md5(unsigned char* text, int textlen, unsigned char* key, int keylen, unsigned char* digest)
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44 {
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45 int i;
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46 MD5_CTX context;
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47 unsigned char ipad[blocksize];
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48 unsigned char opad[blocksize];
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49
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50 /* too long keys are replaced by their hash value */
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51 if (keylen > blocksize) {
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52 MD5_Init(&context);
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53 MD5_Update(&context, key, keylen);
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54 MD5_Final(digest, &context);
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55 key = digest;
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56 keylen = hashsize;
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57 }
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59 /* copy the key into the pads */
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60 memset(ipad, 0, sizeof(ipad));
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61 memcpy(ipad, key, keylen);
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62
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63 memset(opad, 0, sizeof(opad));
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64 memcpy(opad, key, keylen);
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65
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66 /* xor the pads with their ``basic'' value */
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67 for (i=0; i<blocksize; i++) {
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68 ipad[i] ^= 0x36;
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69 opad[i] ^= 0x5c;
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70 }
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72 /* inner pass (ipad ++ message) */
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73 MD5_Init(&context);
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74 MD5_Update(&context, ipad, sizeof(ipad));
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75 MD5_Update(&context, text, textlen);
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76 MD5_Final(digest, &context);
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77
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78 /* outer pass (opad ++ result of inner pass) */
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79 MD5_Init(&context);
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80 MD5_Update(&context, opad, sizeof(opad));
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81 MD5_Update(&context, digest, hashsize);
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82 MD5_Final(digest, &context);
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83 }