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annotate hmac_file.c @ 211:f01f0400314d libtomcrypt

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disapproval of revision 6a39eb8b36778460fca83b8149df2a8b6d3327fd
author Matt Johnston <matt@ucc.asn.au>
date Wed, 06 Jul 2005 13:23:45 +0000
parents d7da3b1e1540
children 5d99163f7e32
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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 /*
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16 (1) append zeros to the end of K to create a B byte string
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17 (e.g., if K is of length 20 bytes and B=64, then K will be
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18 appended with 44 zero bytes 0x00)
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19 (2) XOR (bitwise exclusive-OR) the B byte string computed in step
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20 (1) with ipad (ipad = the byte 0x36 repeated B times)
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21 (3) append the stream of data 'text' to the B byte string resulting
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22 from step (2)
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23 (4) apply H to the stream generated in step (3)
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24 (5) XOR (bitwise exclusive-OR) the B byte string computed in
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25 step (1) with opad (opad = the byte 0x5C repeated B times.)
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26 (6) append the H result from step (4) to the B byte string
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27 resulting from step (5)
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28 (7) apply H to the stream generated in step (6) and output
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29 the result
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30 */
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31
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32 #ifdef HMAC
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33
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34 #define HMAC_BLOCKSIZE hash_descriptor[hash].blocksize
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35
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36 /* hmac_file added by Tom St Denis */
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37 int hmac_file(int hash, const char *fname,
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38 const unsigned char *key, unsigned long keylen,
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39 unsigned char *dst, unsigned long *dstlen)
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40 {
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41 #ifdef NO_FILE
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42 return CRYPT_NOP;
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43 #else
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44 hmac_state hmac;
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45 FILE *in;
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46 unsigned char buf[512];
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47 size_t x;
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48 int err;
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49
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50 _ARGCHK(fname != NULL);
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51 _ARGCHK(key != NULL);
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52 _ARGCHK(dst != NULL);
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53 _ARGCHK(dstlen != NULL);
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54
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55 if((err = hash_is_valid(hash)) != CRYPT_OK) {
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56 return err;
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57 }
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58
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59 if ((err = hmac_init(&hmac, hash, key, keylen)) != CRYPT_OK) {
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60 return err;
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61 }
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62
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63 in = fopen(fname, "rb");
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64 if (in == NULL) {
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65 return CRYPT_FILE_NOTFOUND;
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66 }
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67
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68 /* process the file contents */
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69 do {
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70 x = fread(buf, 1, sizeof(buf), in);
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71 if ((err = hmac_process(&hmac, buf, (unsigned long)x)) != CRYPT_OK) {
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72 /* we don't trap this error since we're already returning an error! */
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73 fclose(in);
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74 return err;
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75 }
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76 } while (x == sizeof(buf));
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77
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78 if (fclose(in) != 0) {
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79 return CRYPT_ERROR;
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80 }
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81
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82 /* get final hmac */
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83 if ((err = hmac_done(&hmac, dst, dstlen)) != CRYPT_OK) {
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84 return err;
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85 }
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86
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87 #ifdef CLEAN_STACK
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88 /* clear memory */
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89 zeromem(buf, sizeof(buf));
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90 #endif
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91 return CRYPT_OK;
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92 #endif
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93 }
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94
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95 #endif
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96