1/*	$NetBSD: hmac.h,v 1.2 2018/04/06 18:59:00 christos Exp $	*/
2/* $OpenBSD: hmac.h,v 1.9 2014/06/24 01:13:21 djm Exp $ */
3/*
4 * Copyright (c) 2014 Markus Friedl.  All rights reserved.
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19#ifndef _HMAC_H
20#define _HMAC_H
21
22/* Returns the algorithm's digest length in bytes or 0 for invalid algorithm */
23size_t ssh_hmac_bytes(int alg);
24
25struct sshbuf;
26struct ssh_hmac_ctx;
27struct ssh_hmac_ctx *ssh_hmac_start(int alg);
28
29/* Sets the state of the HMAC or resets the state if key == NULL */
30int ssh_hmac_init(struct ssh_hmac_ctx *ctx, const void *key, size_t klen)
31	__attribute__((__bounded__(__buffer__, 2, 3)));
32int ssh_hmac_update(struct ssh_hmac_ctx *ctx, const void *m, size_t mlen)
33	__attribute__((__bounded__(__buffer__, 2, 3)));
34int ssh_hmac_update_buffer(struct ssh_hmac_ctx *ctx, const struct sshbuf *b);
35int ssh_hmac_final(struct ssh_hmac_ctx *ctx, u_char *d, size_t dlen)
36	__attribute__((__bounded__(__buffer__, 2, 3)));
37void ssh_hmac_free(struct ssh_hmac_ctx *ctx);
38
39#endif /* _HMAC_H */
40