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comparison libtomcrypt/src/mac/blake2/blake2bmac_file.c @ 1471:6dba84798cd5

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Update to libtomcrypt 1.18.1, merged with Dropbear changes
author Matt Johnston <matt@ucc.asn.au>
date Fri, 09 Feb 2018 21:44:05 +0800
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children e9dba7abd939
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1470:8bba51a55704 1471:6dba84798cd5
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
10 #include "tomcrypt.h"
11
12 #ifdef LTC_BLAKE2BMAC
13
14 /**
15 BLAKE2B MAC a file
16 @param fname The name of the file you wish to BLAKE2B MAC
17 @param key The secret key
18 @param keylen The length of the secret key
19 @param mac [out] The BLAKE2B MAC authentication tag
20 @param maclen [in/out] The max size and resulting size of the authentication tag
21 @return CRYPT_OK if successful, CRYPT_NOP if file support has been disabled
22 */
23 int blake2bmac_file(const char *fname, const unsigned char *key, unsigned long keylen, unsigned char *mac, unsigned long *maclen)
24 {
25 #ifdef LTC_NO_FILE
26 return CRYPT_NOP;
27 #else
28 blake2bmac_state st;
29 FILE *in;
30 unsigned char *buf;
31 size_t x;
32 int err;
33
34 LTC_ARGCHK(fname != NULL);
35 LTC_ARGCHK(key != NULL);
36 LTC_ARGCHK(mac != NULL);
37 LTC_ARGCHK(maclen != NULL);
38
39 if ((buf = XMALLOC(LTC_FILE_READ_BUFSIZE)) == NULL) {
40 return CRYPT_MEM;
41 }
42
43 if ((err = blake2bmac_init(&st, *maclen, key, keylen)) != CRYPT_OK) {
44 goto LBL_ERR;
45 }
46
47 in = fopen(fname, "rb");
48 if (in == NULL) {
49 err = CRYPT_FILE_NOTFOUND;
50 goto LBL_ERR;
51 }
52
53 do {
54 x = fread(buf, 1, LTC_FILE_READ_BUFSIZE, in);
55 if ((err = blake2bmac_process(&st, buf, (unsigned long)x)) != CRYPT_OK) {
56 fclose(in);
57 goto LBL_CLEANBUF;
58 }
59 } while (x == LTC_FILE_READ_BUFSIZE);
60
61 if (fclose(in) != 0) {
62 err = CRYPT_ERROR;
63 goto LBL_CLEANBUF;
64 }
65
66 err = blake2bmac_done(&st, mac, maclen);
67
68 LBL_CLEANBUF:
69 zeromem(buf, LTC_FILE_READ_BUFSIZE);
70 LBL_ERR:
71 #ifdef LTC_CLEAN_STACK
72 zeromem(&st, sizeof(blake2bmac_state));
73 #endif
74 XFREE(buf);
75 return err;
76 #endif
77 }
78
79 #endif
80
81 /* ref: $Format:%D$ */
82 /* git commit: $Format:%H$ */
83 /* commit time: $Format:%ai$ */