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 */
pmac_file(int cipher,const unsigned char * key,unsigned long keylen,const char * filename,unsigned char * out,unsigned long * outlen)30 int 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