1/* $OpenBSD: md-sha256.c,v 1.5 2006/08/03 03:34:42 deraadt Exp $ */
2/*
3 * Copyright (c) 2005 Damien Miller <djm@openbsd.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/* EVP wrapper for SHA256 */
19
20#include "includes.h"
21
22#include <sys/types.h>
23#include <openssl/opensslv.h>
24
25#if !defined(HAVE_EVP_SHA256) && (OPENSSL_VERSION_NUMBER >= 0x00907000L)
26
27#include <string.h>
28#include <openssl/evp.h>
29#ifdef HAVE_SHA256_UPDATE
30# ifdef HAVE_SHA2_H
31#  include <sha2.h>
32# elif defined(HAVE_CRYPTO_SHA2_H)
33#  include <crypto/sha2.h>
34# endif
35#endif
36
37const EVP_MD *evp_ssh_sha256(void);
38
39static int
40ssh_sha256_init(EVP_MD_CTX *ctxt)
41{
42	SHA256_Init(ctxt->md_data);
43	return (1);
44}
45
46static int
47ssh_sha256_update(EVP_MD_CTX *ctxt, const void *data, unsigned long len)
48{
49	SHA256_Update(ctxt->md_data, data, len);
50	return (1);
51}
52
53static int
54ssh_sha256_final(EVP_MD_CTX *ctxt, unsigned char *digest)
55{
56	SHA256_Final(digest, ctxt->md_data);
57	return (1);
58}
59
60static int
61ssh_sha256_cleanup(EVP_MD_CTX *ctxt)
62{
63	memset(ctxt->md_data, 0, sizeof(SHA256_CTX));
64	return (1);
65}
66
67const EVP_MD *
68evp_ssh_sha256(void)
69{
70	static EVP_MD ssh_sha256;
71
72	memset(&ssh_sha256, 0, sizeof(ssh_sha256));
73	ssh_sha256.type = NID_undef;
74	ssh_sha256.md_size = SHA256_DIGEST_LENGTH;
75	ssh_sha256.init = ssh_sha256_init;
76	ssh_sha256.update = ssh_sha256_update;
77	ssh_sha256.final = ssh_sha256_final;
78	ssh_sha256.cleanup = ssh_sha256_cleanup;
79	ssh_sha256.block_size = SHA256_BLOCK_LENGTH;
80	ssh_sha256.ctx_size = sizeof(SHA256_CTX);
81
82	return (&ssh_sha256);
83}
84
85#endif /* !defined(HAVE_EVP_SHA256) && (OPENSSL_VERSION_NUMBER >= 0x00907000L) */
86
87