1/* LibTomCrypt, modular cryptographic library -- Tom St Denis
2 *
3 * LibTomCrypt is a library that provides various cryptographic
4 * algorithms in a highly modular and flexible manner.
5 *
6 * The library is free for all purposes without any express
7 * guarantee it works.
8 *
9 * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.com
10 */
11#include "tomcrypt.h"
12
13/**
14   @file pmac_file.c
15   PMAC implementation, process a file, by Tom St Denis
16*/
17
18#ifdef LTC_PMAC
19
20/**
21   PMAC a file
22   @param cipher       The index of the cipher desired
23   @param key          The secret key
24   @param keylen       The length of the secret key (octets)
25   @param filename     The name of the file to send through PMAC
26   @param out          [out] Destination for the authentication tag
27   @param outlen       [in/out] Max size and resulting size of the authentication tag
28   @return CRYPT_OK if successful, CRYPT_NOP if file support has been disabled
29*/
30int pmac_file(int cipher,
31              const unsigned char *key, unsigned long keylen,
32              const char *filename,
33                    unsigned char *out, unsigned long *outlen)
34{
35#ifdef LTC_NO_FILE
36   return CRYPT_NOP;
37#else
38   int err, x;
39   pmac_state pmac;
40   FILE *in;
41   unsigned char buf[512];
42
43
44   LTC_ARGCHK(key      != NULL);
45   LTC_ARGCHK(filename != NULL);
46   LTC_ARGCHK(out      != NULL);
47   LTC_ARGCHK(outlen   != NULL);
48
49   in = fopen(filename, "rb");
50   if (in == NULL) {
51      return CRYPT_FILE_NOTFOUND;
52   }
53
54   if ((err = pmac_init(&pmac, cipher, key, keylen)) != CRYPT_OK) {
55      fclose(in);
56      return err;
57   }
58
59   do {
60      x = fread(buf, 1, sizeof(buf), in);
61      if ((err = pmac_process(&pmac, buf, x)) != CRYPT_OK) {
62         fclose(in);
63         return err;
64      }
65   } while (x == sizeof(buf));
66   fclose(in);
67
68   if ((err = pmac_done(&pmac, out, outlen)) != CRYPT_OK) {
69      return err;
70   }
71
72#ifdef LTC_CLEAN_STACK
73   zeromem(buf, sizeof(buf));
74#endif
75
76   return CRYPT_OK;
77#endif
78}
79
80#endif
81
82/* $Source: /cvs/libtom/libtomcrypt/src/mac/pmac/pmac_file.c,v $ */
83/* $Revision: 1.5 $ */
84/* $Date: 2006/11/03 00:39:49 $ */
85