diff options
Diffstat (limited to 'src/libfreeswan/libcrypto/include/hmac_generic.h')
| -rw-r--r-- | src/libfreeswan/libcrypto/include/hmac_generic.h | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/src/libfreeswan/libcrypto/include/hmac_generic.h b/src/libfreeswan/libcrypto/include/hmac_generic.h new file mode 100644 index 000000000..a749228e3 --- /dev/null +++ b/src/libfreeswan/libcrypto/include/hmac_generic.h @@ -0,0 +1,60 @@ +#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 */ |