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annotate src/md5/hmac_md5.c @ 304:d5ce2ba71e7b

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manual formating of Received: hdrs; changed hdr for local receival Now the Received: headers are much friendlier to read. About folding: We must fold any line at 998 chars before transfer. We should fold the lines we produce at 78 chars. That is what RFC 2821 requests. We should think about it, somewhen. The header for locally (i.e. non-SMTP) received mail is changed to the format postfix uses. This matches RFC 2821 better. The `from' clause should contain a domain or IP, not a user name. Also, the `with' clause should contain a registered standard protocol name, which ``local'' is not.
author markus schnalke <meillo@marmaro.de>
date Thu, 09 Dec 2010 18:28:11 -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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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 }