digest.h revision 262566 
1/* $OpenBSD: digest.h,v 1.1 2014/01/09 23:20:00 djm Exp $ */
2/*
3 * Copyright (c) 2013 Damien Miller <djm@mindrot.org>
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 _DIGEST_H
19#define _DIGEST_H
20
21/* Maximum digest output length */
22#define SSH_DIGEST_MAX_LENGTH	64
23
24/* Digest algorithms */
25#define SSH_DIGEST_MD5		0
26#define SSH_DIGEST_RIPEMD160	1
27#define SSH_DIGEST_SHA1		2
28#define SSH_DIGEST_SHA256	3
29#define SSH_DIGEST_SHA384	4
30#define SSH_DIGEST_SHA512	5
31#define SSH_DIGEST_MAX		6
32
33/* Returns the algorithm's digest length in bytes or 0 for invalid algorithm */
34size_t ssh_digest_bytes(int alg);
35
36/* One-shot API */
37int ssh_digest_memory(int alg, const void *m, size_t mlen,
38    u_char *d, size_t dlen)
39	__attribute__((__bounded__(__buffer__, 2, 3)))
40	__attribute__((__bounded__(__buffer__, 4, 5)));
41int ssh_digest_buffer(int alg, const Buffer *b, u_char *d, size_t dlen)
42	__attribute__((__bounded__(__buffer__, 3, 4)));
43
44/* Update API */
45struct ssh_digest_ctx;
46struct ssh_digest_ctx *ssh_digest_start(int alg);
47int ssh_digest_update(struct ssh_digest_ctx *ctx, const void *m, size_t mlen)
48	__attribute__((__bounded__(__buffer__, 2, 3)));
49int ssh_digest_update_buffer(struct ssh_digest_ctx *ctx, const Buffer *b);
50int ssh_digest_final(struct ssh_digest_ctx *ctx, u_char *d, size_t dlen)
51	__attribute__((__bounded__(__buffer__, 2, 3)));
52void ssh_digest_free(struct ssh_digest_ctx *ctx);
53
54#endif /* _DIGEST_H */
55
56