store plain skd, not the prf
[strongswan.git] / src / libcrypto / include / hmac_generic.h
1 #ifndef _HMAC_GENERIC_H
2 #define _HMAC_GENERIC_H
3 /*
4 * HMAC macro helpers
5 *
6 * Author: JuanJo Ciarlante <jjo-ipsec@mendoza.gov.ar>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 * for more details.
17 *
18 */
19
20 #ifndef DIVUP
21 #define DIVUP(x,y) ((x + y -1) / y) /* divide, rounding upwards */
22 #endif
23 #ifndef HMAC_IPAD
24 #define HMAC_IPAD 0x36
25 #define HMAC_OPAD 0x5C
26 #endif
27 #define HMAC_SET_KEY_IMPL(func_name, hctx_t, blocksize, func_init, func_update) \
28 void func_name(hctx_t *hctx, const u_int8_t * key, int keylen) { \
29 int i;\
30 u_int8_t kb[blocksize]; \
31 for (i = 0; i < DIVUP(keylen*8, 8); i++) { \
32 kb[i] = key[i] ^ HMAC_IPAD; \
33 } \
34 for (; i < blocksize; i++) { \
35 kb[i] = HMAC_IPAD; \
36 } \
37 func_init(&hctx->ictx); \
38 func_update(&hctx->ictx, kb, blocksize); \
39 for (i = 0; i < blocksize; i++) { \
40 kb[i] ^= (HMAC_IPAD ^ HMAC_OPAD); \
41 } \
42 func_init(&hctx->octx); \
43 func_update(&hctx->octx, kb, blocksize); \
44 }
45 #define HMAC_HASH_IMPL(func_name, hctx_t, ctx_t, ahlen, func_update, func_result ) \
46 void func_name(hctx_t *hctx, const u_int8_t * dat, int len, u_int8_t * hash, int hashlen) { \
47 ctx_t ctx; \
48 ctx=hctx->ictx; \
49 if (dat) func_update(&ctx, dat, len); \
50 if (hash) { \
51 u_int8_t hash_buf[ahlen]; \
52 func_result(&ctx, hash_buf, ahlen); \
53 ctx=hctx->octx; \
54 func_update(&ctx, hash_buf, ahlen); \
55 func_result(&ctx, hash, hashlen); \
56 memset(&ctx, 0, sizeof (ctx)); \
57 memset(&hash_buf, 0, sizeof (hash_buf));\
58 } \
59 }
60 #endif /* _HMAC_GENERIC_H */