1 /* $OpenBSD: md-sha256.c,v 1.3 2006/03/25 13:17:02 djm 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 <openssl/evp.h>
21 #include <sha2.h>
22 #include <string.h>
23
24 /* helper until OpenSSL 0.9.8h+ upgrade */
25 __RCSID("$MirOS: src/usr.bin/ssh/md-sha256.c,v 1.3 2008/12/16 22:09:56 tg Exp $");
26
27 const EVP_MD *evp_ssh_sha256(void);
28
29 static int
ssh_sha256_init(EVP_MD_CTX * ctxt)30 ssh_sha256_init(EVP_MD_CTX *ctxt)
31 {
32 SHA256_Init(ctxt->md_data);
33 return (1);
34 }
35
36 static int
ssh_sha256_update(EVP_MD_CTX * ctxt,const void * data,unsigned long len)37 ssh_sha256_update(EVP_MD_CTX *ctxt, const void *data, unsigned long len)
38 {
39 SHA256_Update(ctxt->md_data, data, len);
40 return (1);
41 }
42
43 static int
ssh_sha256_final(EVP_MD_CTX * ctxt,unsigned char * digest)44 ssh_sha256_final(EVP_MD_CTX *ctxt, unsigned char *digest)
45 {
46 SHA256_Final(digest, ctxt->md_data);
47 return (1);
48 }
49
50 static int
ssh_sha256_cleanup(EVP_MD_CTX * ctxt)51 ssh_sha256_cleanup(EVP_MD_CTX *ctxt)
52 {
53 memset(ctxt->md_data, 0, sizeof(SHA256_CTX));
54 return (1);
55 }
56
57 const EVP_MD *
evp_ssh_sha256(void)58 evp_ssh_sha256(void)
59 {
60 static EVP_MD ssh_sha256;
61
62 memset(&ssh_sha256, 0, sizeof(ssh_sha256));
63 ssh_sha256.type = NID_undef;
64 ssh_sha256.md_size = SHA256_DIGEST_LENGTH;
65 ssh_sha256.init = ssh_sha256_init;
66 ssh_sha256.update = ssh_sha256_update;
67 ssh_sha256.final = ssh_sha256_final;
68 ssh_sha256.cleanup = ssh_sha256_cleanup;
69 ssh_sha256.block_size = SHA256_BLOCK_LENGTH;
70 ssh_sha256.ctx_size = sizeof(SHA256_CTX);
71
72 return (&ssh_sha256);
73 }
74