1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
#ifndef _HMAC_GENERIC_H
#define _HMAC_GENERIC_H
/*
* HMAC macro helpers
*
* Author: JuanJo Ciarlante <jjo-ipsec@mendoza.gov.ar>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
*/
#ifndef DIVUP
#define DIVUP(x,y) ((x + y -1) / y) /* divide, rounding upwards */
#endif
#ifndef HMAC_IPAD
#define HMAC_IPAD 0x36
#define HMAC_OPAD 0x5C
#endif
#define HMAC_SET_KEY_IMPL(func_name, hctx_t, blocksize, func_init, func_update) \
void func_name(hctx_t *hctx, const u_int8_t * key, int keylen) { \
int i;\
u_int8_t kb[blocksize]; \
for (i = 0; i < DIVUP(keylen*8, 8); i++) { \
kb[i] = key[i] ^ HMAC_IPAD; \
} \
for (; i < blocksize; i++) { \
kb[i] = HMAC_IPAD; \
} \
func_init(&hctx->ictx); \
func_update(&hctx->ictx, kb, blocksize); \
for (i = 0; i < blocksize; i++) { \
kb[i] ^= (HMAC_IPAD ^ HMAC_OPAD); \
} \
func_init(&hctx->octx); \
func_update(&hctx->octx, kb, blocksize); \
}
#define HMAC_HASH_IMPL(func_name, hctx_t, ctx_t, ahlen, func_update, func_result ) \
void func_name(hctx_t *hctx, const u_int8_t * dat, int len, u_int8_t * hash, int hashlen) { \
ctx_t ctx; \
ctx=hctx->ictx; \
if (dat) func_update(&ctx, dat, len); \
if (hash) { \
u_int8_t hash_buf[ahlen]; \
func_result(&ctx, hash_buf, ahlen); \
ctx=hctx->octx; \
func_update(&ctx, hash_buf, ahlen); \
func_result(&ctx, hash, hashlen); \
memset(&ctx, 0, sizeof (ctx)); \
memset(&hash_buf, 0, sizeof (hash_buf));\
} \
}
#endif /* _HMAC_GENERIC_H */
|
