1 /* $OpenBSD: kexdh.c,v 1.26 2016/05/02 10:26:04 djm Exp $ */
3 * Copyright (c) 2001 Markus Friedl. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 #include <sys/types.h>
34 #include <openssl/evp.h>
36 #include "openbsd-compat/openssl-compat.h"
49 const char *client_version_string,
50 const char *server_version_string,
51 const u_char *ckexinit, size_t ckexinitlen,
52 const u_char *skexinit, size_t skexinitlen,
53 const u_char *serverhostkeyblob, size_t sbloblen,
54 const BIGNUM *client_dh_pub,
55 const BIGNUM *server_dh_pub,
56 const BIGNUM *shared_secret,
57 u_char *hash, size_t *hashlen)
62 if (*hashlen < ssh_digest_bytes(hash_alg))
63 return SSH_ERR_INVALID_ARGUMENT;
64 if ((b = sshbuf_new()) == NULL)
65 return SSH_ERR_ALLOC_FAIL;
66 if ((r = sshbuf_put_cstring(b, client_version_string)) != 0 ||
67 (r = sshbuf_put_cstring(b, server_version_string)) != 0 ||
68 /* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */
69 (r = sshbuf_put_u32(b, ckexinitlen+1)) != 0 ||
70 (r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 ||
71 (r = sshbuf_put(b, ckexinit, ckexinitlen)) != 0 ||
72 (r = sshbuf_put_u32(b, skexinitlen+1)) != 0 ||
73 (r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 ||
74 (r = sshbuf_put(b, skexinit, skexinitlen)) != 0 ||
75 (r = sshbuf_put_string(b, serverhostkeyblob, sbloblen)) != 0 ||
76 (r = sshbuf_put_bignum2(b, client_dh_pub)) != 0 ||
77 (r = sshbuf_put_bignum2(b, server_dh_pub)) != 0 ||
78 (r = sshbuf_put_bignum2(b, shared_secret)) != 0) {
83 sshbuf_dump(b, stderr);
85 if (ssh_digest_buffer(hash_alg, b, hash, *hashlen) != 0) {
87 return SSH_ERR_LIBCRYPTO_ERROR;
90 *hashlen = ssh_digest_bytes(hash_alg);
92 dump_digest("hash", hash, *hashlen);
96 #endif /* WITH_OPENSSL */