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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis |
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2 * |
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3 * LibTomCrypt is a library that provides various cryptographic |
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4 * algorithms in a highly modular and flexible manner. |
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5 * |
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6 * The library is free for all purposes without any express |
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7 * guarantee it works. |
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8 * |
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9 * Tom St Denis, [email protected], http://libtomcrypt.org |
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10 */ |
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11 /* Submited by Dobes Vandermeer ([email protected]) */ |
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12 |
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13 #include "mycrypt.h" |
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14 |
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15 #ifdef HMAC |
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16 |
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17 /* hmac_file added by Tom St Denis */ |
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18 int hmac_file(int hash, const char *fname, |
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19 const unsigned char *key, unsigned long keylen, |
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20 unsigned char *dst, unsigned long *dstlen) |
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21 { |
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22 #ifdef NO_FILE |
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23 return CRYPT_NOP; |
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24 #else |
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25 hmac_state hmac; |
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26 FILE *in; |
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27 unsigned char buf[512]; |
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28 size_t x; |
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29 int err; |
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30 |
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31 _ARGCHK(fname != NULL); |
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32 _ARGCHK(key != NULL); |
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33 _ARGCHK(dst != NULL); |
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34 _ARGCHK(dstlen != NULL); |
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35 |
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36 if((err = hash_is_valid(hash)) != CRYPT_OK) { |
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37 return err; |
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38 } |
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39 |
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40 if ((err = hmac_init(&hmac, hash, key, keylen)) != CRYPT_OK) { |
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41 return err; |
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42 } |
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43 |
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44 in = fopen(fname, "rb"); |
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45 if (in == NULL) { |
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46 return CRYPT_FILE_NOTFOUND; |
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47 } |
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48 |
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49 /* process the file contents */ |
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50 do { |
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51 x = fread(buf, 1, sizeof(buf), in); |
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52 if ((err = hmac_process(&hmac, buf, (unsigned long)x)) != CRYPT_OK) { |
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53 /* we don't trap this error since we're already returning an error! */ |
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54 fclose(in); |
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55 return err; |
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56 } |
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57 } while (x == sizeof(buf)); |
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58 |
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59 if (fclose(in) != 0) { |
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60 return CRYPT_ERROR; |
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61 } |
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62 |
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63 /* get final hmac */ |
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64 if ((err = hmac_done(&hmac, dst, dstlen)) != CRYPT_OK) { |
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65 return err; |
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66 } |
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67 |
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68 #ifdef CLEAN_STACK |
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69 /* clear memory */ |
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70 zeromem(buf, sizeof(buf)); |
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71 #endif |
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72 return CRYPT_OK; |
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73 #endif |
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74 } |
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75 |
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76 #endif |
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77 |
