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/* crypto interfaces
* Copyright (C) 1998, 1999 D. Hugh Redelmeier.
*
* 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.
*
* RCSID $Id: crypto.h,v 1.14 2002/04/24 07:35:47 mcr Exp $
*/
#include <gmp.h> /* GNU MP library */
extern void init_crypto(void);
/* Oakley group descriptions */
extern MP_INT groupgenerator; /* MODP group generator (2) */
struct oakley_group_desc {
u_int16_t group;
MP_INT *modulus;
size_t bytes;
};
extern const struct oakley_group_desc unset_group; /* magic signifier */
extern const struct oakley_group_desc *lookup_group(u_int16_t group);
/* unification of cryptographic encoding/decoding algorithms
* The IV is taken from and returned to st->st_new_iv.
* This allows the old IV to be retained.
* Use update_iv to commit to the new IV (for example, once a packet has
* been validated).
*/
#define MAX_OAKLEY_KEY_LEN (3 * DES_CBC_BLOCK_SIZE)
struct state; /* forward declaration, dammit */
struct encrypt_desc {
size_t blocksize;
size_t keysize;
void (*crypt)(bool enc, void *buf, size_t buf_len, struct state *st);
};
const struct encrypt_desc oakley_encrypter[OAKLEY_CAST_CBC + 1];
#define update_iv(st) memcpy((st)->st_iv, (st)->st_new_iv \
, (st)->st_iv_len = (st)->st_new_iv_len)
/* unification of cryptographic hashing mechanisms */
union hash_ctx {
MD5_CTX ctx_md5;
SHA1_CTX ctx_sha1;
};
struct hash_desc {
size_t hash_digest_len; /* length of digest */
void (*hash_init)(union hash_ctx *); /* initialize context */
void (*hash_update)(union hash_ctx *, const u_char *input, unsigned int len); /* add input to hash */
void (*hash_final)(u_char *output, union hash_ctx *); /* finalize hash */
};
extern const struct hash_desc oakley_hasher[OAKLEY_TIGER+1];
/* HMAC package
* Note that hmac_ctx can be (and is) copied since there are
* no persistent pointers into it.
*/
struct hmac_ctx {
const struct hash_desc *h; /* underlying hash function */
size_t hmac_digest_len; /* copy of h->hash_digest_len */
union hash_ctx hash_ctx; /* ctx for hash function */
u_char buf1[HMAC_BUFSIZE], buf2[HMAC_BUFSIZE];
};
extern void hmac_init(
struct hmac_ctx *ctx,
const struct hash_desc *h,
const u_char *key,
size_t key_len);
#define hmac_init_chunk(ctx, h, ch) hmac_init((ctx), (h), (ch).ptr, (ch).len)
extern void hmac_reinit(struct hmac_ctx *ctx); /* saves recreating pads */
extern void hmac_update(
struct hmac_ctx *ctx,
const u_char *data,
size_t data_len);
#define hmac_update_chunk(ctx, ch) hmac_update((ctx), (ch).ptr, (ch).len)
extern void hmac_final(u_char *output, struct hmac_ctx *ctx);
#define hmac_final_chunk(ch, name, ctx) { \
pfreeany((ch).ptr); \
(ch).len = (ctx)->hmac_digest_len; \
(ch).ptr = alloc_bytes((ch).len, name); \
hmac_final((ch).ptr, (ctx)); \
}
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