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1 /* hmac-md5.c -- hashed message authentication codes |
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2 Copyright (C) 2005 Free Software Foundation, Inc. |
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3 |
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4 This program is free software; you can redistribute it and/or modify |
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5 it under the terms of the GNU General Public License as published by |
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6 the Free Software Foundation; either version 2, or (at your option) |
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7 any later version. |
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8 |
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9 This program is distributed in the hope that it will be useful, |
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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12 GNU General Public License for more details. |
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13 |
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14 You should have received a copy of the GNU General Public License |
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15 along with this program; if not, write to the Free Software Foundation, |
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16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ |
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17 |
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18 /* Written by Simon Josefsson. */ |
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19 |
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20 #ifdef HAVE_CONFIG_H |
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21 # include <config.h> |
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22 #endif |
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23 |
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24 #include "hmac.h" |
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25 |
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26 #include "md5.h" |
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27 |
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28 #include <string.h> |
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29 |
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30 #define IPAD 0x36 |
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31 #define OPAD 0x5c |
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32 |
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33 int |
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34 hmac_md5 (const void *key, size_t keylen, |
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35 const void *in, size_t inlen, void *resbuf) |
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36 { |
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37 struct md5_ctx inner; |
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38 struct md5_ctx outer; |
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39 char optkeybuf[16]; |
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40 char block[64]; |
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41 char innerhash[16]; |
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42 |
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43 if (keylen > 64) |
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44 { |
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45 struct md5_ctx keyhash; |
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46 |
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47 md5_init_ctx (&keyhash); |
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48 md5_process_bytes (key, keylen, &keyhash); |
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49 md5_finish_ctx (&keyhash, optkeybuf); |
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50 |
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51 key = optkeybuf; |
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52 keylen = 16; |
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53 } |
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54 |
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55 md5_init_ctx (&inner); |
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56 |
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57 memset (block, IPAD, sizeof (block)); |
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58 memxor (block, key, keylen); |
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59 |
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60 md5_process_block (block, 64, &inner); |
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61 md5_process_bytes (in, inlen, &inner); |
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62 |
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63 md5_finish_ctx (&inner, innerhash); |
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64 |
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65 md5_init_ctx (&outer); |
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66 |
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67 memset (block, OPAD, sizeof (block)); |
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68 memxor (block, key, keylen); |
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69 |
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70 md5_process_block (block, 64, &outer); |
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71 md5_process_bytes (innerhash, 16, &outer); |
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72 |
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73 md5_finish_ctx (&outer, resbuf); |
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74 |
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75 return 0; |
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76 } |
