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Removes Freshmeat.net from the docs The site, which was later renamed to freecode.com, is no longer maintained (contains only a static copy).
author markus schnalke <meillo@marmaro.de>
date Sat, 07 Feb 2015 11:45:07 +0100
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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,
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44 unsigned char *digest)
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45 {
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46 int i;
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47 MD5_CTX context;
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48 unsigned char ipad[blocksize];
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49 unsigned char opad[blocksize];
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51 /* too long keys are replaced by their hash value */
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52 if (keylen > blocksize) {
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53 MD5_Init(&context);
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54 MD5_Update(&context, key, keylen);
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55 MD5_Final(digest, &context);
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56 key = digest;
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57 keylen = hashsize;
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58 }
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60 /* copy the key into the pads */
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61 memset(ipad, 0, sizeof(ipad));
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62 memcpy(ipad, key, keylen);
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64 memset(opad, 0, sizeof(opad));
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65 memcpy(opad, key, keylen);
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67 /* xor the pads with their ``basic'' value */
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68 for (i=0; i<blocksize; i++) {
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69 ipad[i] ^= 0x36;
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70 opad[i] ^= 0x5c;
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71 }
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73 /* inner pass (ipad ++ message) */
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74 MD5_Init(&context);
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75 MD5_Update(&context, ipad, sizeof(ipad));
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76 MD5_Update(&context, text, textlen);
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77 MD5_Final(digest, &context);
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78
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79 /* outer pass (opad ++ result of inner pass) */
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80 MD5_Init(&context);
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81 MD5_Update(&context, opad, sizeof(opad));
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82 MD5_Update(&context, digest, hashsize);
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83 MD5_Final(digest, &context);
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84 }