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annotate src/md5/hmac_md5.c @ 269:fd1d77e5a5da

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comment: problems with `To: alice, bob' and -t
author markus schnalke <meillo@marmaro.de>
date Fri, 03 Dec 2010 12:55:44 -0300
parents 0f36c0a46f82
children 41958685480d
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08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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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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29
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30 #include <string.h>
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31 #include "md5.h"
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33
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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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58
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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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71
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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 }