1/*	$NetBSD: md-sha256.c,v 1.5 2017/04/18 18:41:46 christos Exp $	*/
2/* $OpenBSD: md-sha256.c,v 1.5 2006/08/03 03:34:42 deraadt Exp $ */
3/*
4 * Copyright (c) 2005 Damien Miller <djm@openbsd.org>
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/* EVP wrapper for SHA256 */
20#include "includes.h"
21__RCSID("$NetBSD: md-sha256.c,v 1.5 2017/04/18 18:41:46 christos Exp $");
22
23#include <sys/types.h>
24
25#include <openssl/evp.h>
26
27#include <sys/sha2.h>
28#include <string.h>
29
30const EVP_MD *evp_ssh_sha256(void);
31
32static int
33ssh_sha256_init(EVP_MD_CTX *ctxt)
34{
35	SHA256_Init(ctxt->md_data);
36	return (1);
37}
38
39static int
40ssh_sha256_update(EVP_MD_CTX *ctxt, const void *data, size_t len)
41{
42	SHA256_Update(ctxt->md_data, data, len);
43	return (1);
44}
45
46static int
47ssh_sha256_final(EVP_MD_CTX *ctxt, unsigned char *digest)
48{
49	SHA256_Final(digest, ctxt->md_data);
50	return (1);
51}
52
53static int
54ssh_sha256_cleanup(EVP_MD_CTX *ctxt)
55{
56	memset(ctxt->md_data, 0, sizeof(SHA256_CTX));
57	return (1);
58}
59
60const EVP_MD *
61evp_ssh_sha256(void)
62{
63	static EVP_MD ssh_sha256;
64
65	memset(&ssh_sha256, 0, sizeof(ssh_sha256));
66	ssh_sha256.type = NID_undef;
67	ssh_sha256.md_size = SHA256_DIGEST_LENGTH;
68	ssh_sha256.init = ssh_sha256_init;
69	ssh_sha256.update = ssh_sha256_update;
70	ssh_sha256.final = ssh_sha256_final;
71	ssh_sha256.cleanup = ssh_sha256_cleanup;
72	ssh_sha256.block_size = SHA256_BLOCK_LENGTH;
73	ssh_sha256.ctx_size = sizeof(SHA256_CTX);
74
75	return (&ssh_sha256);
76}
77