hmac.h revision 295367 
1/* $OpenBSD: hmac.h,v 1.9 2014/06/24 01:13:21 djm Exp $ */
2/*
3 * Copyright (c) 2014 Markus Friedl.  All rights reserved.
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18#ifndef _HMAC_H
19#define _HMAC_H
20
21/* Returns the algorithm's digest length in bytes or 0 for invalid algorithm */
22size_t ssh_hmac_bytes(int alg);
23
24struct sshbuf;
25struct ssh_hmac_ctx;
26struct ssh_hmac_ctx *ssh_hmac_start(int alg);
27
28/* Sets the state of the HMAC or resets the state if key == NULL */
29int ssh_hmac_init(struct ssh_hmac_ctx *ctx, const void *key, size_t klen)
30	__attribute__((__bounded__(__buffer__, 2, 3)));
31int ssh_hmac_update(struct ssh_hmac_ctx *ctx, const void *m, size_t mlen)
32	__attribute__((__bounded__(__buffer__, 2, 3)));
33int ssh_hmac_update_buffer(struct ssh_hmac_ctx *ctx, const struct sshbuf *b);
34int ssh_hmac_final(struct ssh_hmac_ctx *ctx, u_char *d, size_t dlen)
35	__attribute__((__bounded__(__buffer__, 2, 3)));
36void ssh_hmac_free(struct ssh_hmac_ctx *ctx);
37
38#endif /* _HMAC_H */
39