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#ifdef __APPLE_CRYPTO__
24#include "ossl-crypto.h"
25#else
26#include <openssl/opensslv.h>
27#endif
28
29#if !defined(HAVE_EVP_SHA256) && (OPENSSL_VERSION_NUMBER >= 0x00907000L)
30
31#include <string.h>
32#ifdef __APPLE_CRYPTO__
33#error "HAVE_EVP_SHA256 should be defined"
34#else
35#include <openssl/evp.h>
36#ifdef HAVE_SHA256_UPDATE
37# ifdef HAVE_SHA2_H
38#  include <sha2.h>
39# elif defined(HAVE_CRYPTO_SHA2_H)
40#  include <crypto/sha2.h>
41# endif
42#endif /* HAVE_SHA256_UPDATE */
43#endif /* __APPLE_CRYPTO__ */
44
45const EVP_MD *evp_ssh_sha256(void);
46
47static int
48ssh_sha256_init(EVP_MD_CTX *ctxt)
49{
50	SHA256_Init(ctxt->md_data);
51	return (1);
52}
53
54static int
55ssh_sha256_update(EVP_MD_CTX *ctxt, const void *data, unsigned long len)
56{
57	SHA256_Update(ctxt->md_data, data, len);
58	return (1);
59}
60
61static int
62ssh_sha256_final(EVP_MD_CTX *ctxt, unsigned char *digest)
63{
64	SHA256_Final(digest, ctxt->md_data);
65	return (1);
66}
67
68static int
69ssh_sha256_cleanup(EVP_MD_CTX *ctxt)
70{
71	memset(ctxt->md_data, 0, sizeof(SHA256_CTX));
72	return (1);
73}
74
75const EVP_MD *
76evp_ssh_sha256(void)
77{
78	static EVP_MD ssh_sha256;
79
80	memset(&ssh_sha256, 0, sizeof(ssh_sha256));
81	ssh_sha256.type = NID_undef;
82	ssh_sha256.md_size = SHA256_DIGEST_LENGTH;
83	ssh_sha256.init = ssh_sha256_init;
84	ssh_sha256.update = ssh_sha256_update;
85	ssh_sha256.final = ssh_sha256_final;
86	ssh_sha256.cleanup = ssh_sha256_cleanup;
87	ssh_sha256.block_size = SHA256_BLOCK_LENGTH;
88	ssh_sha256.ctx_size = sizeof(SHA256_CTX);
89
90	return (&ssh_sha256);
91}
92
93#endif /* !defined(HAVE_EVP_SHA256) && (OPENSSL_VERSION_NUMBER >= 0x00907000L) */
94
95