Mercurial > dropbear

annotate libtomcrypt/src/mac/omac/omac_file.c @ 556:ccdc4c6183c0

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- Payload length doesn't include macsize.
author Matt Johnston <matt@ucc.asn.au>
date Sun, 26 Jul 2009 16:11:27 +0000
parents 0cbe8f6dbf9e
children f849a5ca2efc
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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.com
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10 */
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11 #include "tomcrypt.h"
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12
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13 /**
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14 @file omac_file.c
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15 OMAC1 support, process a file, Tom St Denis
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16 */
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17
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18 #ifdef LTC_OMAC
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19
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20 /**
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21 OMAC a file
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22 @param cipher The index of the cipher desired
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23 @param key The secret key
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24 @param keylen The length of the secret key (octets)
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25 @param filename The name of the file you wish to OMAC
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26 @param out [out] Where the authentication tag is to be stored
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27 @param outlen [in/out] The max size and resulting size of the authentication tag
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28 @return CRYPT_OK if successful, CRYPT_NOP if file support has been disabled
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29 */
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30 int omac_file(int cipher,
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31 const unsigned char *key, unsigned long keylen,
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32 const char *filename,
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33 unsigned char *out, unsigned long *outlen)
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34 {
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35 #ifdef LTC_NO_FILE
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36 return CRYPT_NOP;
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37 #else
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38 int err, x;
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39 omac_state omac;
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40 FILE *in;
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41 unsigned char buf[512];
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42
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43 LTC_ARGCHK(key != NULL);
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44 LTC_ARGCHK(filename != NULL);
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45 LTC_ARGCHK(out != NULL);
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46 LTC_ARGCHK(outlen != NULL);
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47
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48 in = fopen(filename, "rb");
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49 if (in == NULL) {
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50 return CRYPT_FILE_NOTFOUND;
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51 }
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52
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53 if ((err = omac_init(&omac, cipher, key, keylen)) != CRYPT_OK) {
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54 fclose(in);
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55 return err;
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56 }
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57
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58 do {
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59 x = fread(buf, 1, sizeof(buf), in);
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60 if ((err = omac_process(&omac, buf, x)) != CRYPT_OK) {
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61 fclose(in);
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62 return err;
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63 }
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64 } while (x == sizeof(buf));
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65 fclose(in);
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66
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67 if ((err = omac_done(&omac, out, outlen)) != CRYPT_OK) {
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68 return err;
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69 }
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70
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71 #ifdef LTC_CLEAN_STACK
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72 zeromem(buf, sizeof(buf));
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73 #endif
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74
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75 return CRYPT_OK;
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76 #endif
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77 }
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78
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79 #endif
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80
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81 /* $Source: /cvs/libtom/libtomcrypt/src/mac/omac/omac_file.c,v $ */
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82 /* $Revision: 1.5 $ */
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83 /* $Date: 2006/11/03 00:39:49 $ */