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
37 const EVP_MD *evp_ssh_sha256(void);
38
39 static int
ssh_sha256_init(EVP_MD_CTX * ctxt)40 ssh_sha256_init(EVP_MD_CTX *ctxt)
41 {
42 SHA256_Init(ctxt->md_data);
43 return (1);
44 }
45
46 static int
ssh_sha256_update(EVP_MD_CTX * ctxt,const void * data,unsigned long len)47 ssh_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
53 static int
ssh_sha256_final(EVP_MD_CTX * ctxt,unsigned char * digest)54 ssh_sha256_final(EVP_MD_CTX *ctxt, unsigned char *digest)
55 {
56 SHA256_Final(digest, ctxt->md_data);
57 return (1);
58 }
59
60 static int
ssh_sha256_cleanup(EVP_MD_CTX * ctxt)61 ssh_sha256_cleanup(EVP_MD_CTX *ctxt)
62 {
63 memset(ctxt->md_data, 0, sizeof(SHA256_CTX));
64 return (1);
65 }
66
67 const EVP_MD *
evp_ssh_sha256(void)68 evp_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