1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis */
2 /* SPDX-License-Identifier: Unlicense */
3
4 #include "tomcrypt_private.h"
5
6 #ifdef LTC_BLAKE2SMAC
7
8 /**
9 BLAKE2S MAC a file
10 @param fname The name of the file you wish to BLAKE2S MAC
11 @param key The secret key
12 @param keylen The length of the secret key
13 @param mac [out] The BLAKE2S MAC authentication tag
14 @param maclen [in/out] The max size and resulting size of the authentication tag
15 @return CRYPT_OK if successful, CRYPT_NOP if file support has been disabled
16 */
blake2smac_file(const char * fname,const unsigned char * key,unsigned long keylen,unsigned char * mac,unsigned long * maclen)17 int blake2smac_file(const char *fname, const unsigned char *key, unsigned long keylen, unsigned char *mac, unsigned long *maclen)
18 {
19 #ifdef LTC_NO_FILE
20 LTC_UNUSED_PARAM(fname);
21 LTC_UNUSED_PARAM(key);
22 LTC_UNUSED_PARAM(keylen);
23 LTC_UNUSED_PARAM(mac);
24 LTC_UNUSED_PARAM(maclen);
25 return CRYPT_NOP;
26 #else
27 blake2smac_state st;
28 FILE *in;
29 unsigned char *buf;
30 size_t x;
31 int err;
32
33 LTC_ARGCHK(fname != NULL);
34 LTC_ARGCHK(key != NULL);
35 LTC_ARGCHK(mac != NULL);
36 LTC_ARGCHK(maclen != NULL);
37
38 if ((buf = XMALLOC(LTC_FILE_READ_BUFSIZE)) == NULL) {
39 return CRYPT_MEM;
40 }
41
42 if ((err = blake2smac_init(&st, *maclen, key, keylen)) != CRYPT_OK) {
43 goto LBL_ERR;
44 }
45
46 in = fopen(fname, "rb");
47 if (in == NULL) {
48 err = CRYPT_FILE_NOTFOUND;
49 goto LBL_ERR;
50 }
51
52 do {
53 x = fread(buf, 1, LTC_FILE_READ_BUFSIZE, in);
54 if ((err = blake2smac_process(&st, buf, (unsigned long)x)) != CRYPT_OK) {
55 fclose(in);
56 goto LBL_CLEANBUF;
57 }
58 } while (x == LTC_FILE_READ_BUFSIZE);
59
60 if (fclose(in) != 0) {
61 err = CRYPT_ERROR;
62 goto LBL_CLEANBUF;
63 }
64
65 err = blake2smac_done(&st, mac, maclen);
66
67 LBL_CLEANBUF:
68 zeromem(buf, LTC_FILE_READ_BUFSIZE);
69 LBL_ERR:
70 #ifdef LTC_CLEAN_STACK
71 zeromem(&st, sizeof(blake2smac_state));
72 #endif
73 XFREE(buf);
74 return err;
75 #endif
76 }
77
78 #endif
79