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0bc35151 | 1 | /* |
2 | * Copyright (c) 2001 Markus Friedl. All rights reserved. | |
3 | * | |
4 | * Redistribution and use in source and binary forms, with or without | |
5 | * modification, are permitted provided that the following conditions | |
6 | * are met: | |
7 | * 1. Redistributions of source code must retain the above copyright | |
8 | * notice, this list of conditions and the following disclaimer. | |
9 | * 2. Redistributions in binary form must reproduce the above copyright | |
10 | * notice, this list of conditions and the following disclaimer in the | |
11 | * documentation and/or other materials provided with the distribution. | |
12 | * | |
13 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
15 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
16 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
17 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
18 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
19 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
20 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
21 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
22 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
23 | */ | |
24 | ||
25 | #include "includes.h" | |
47e5dc72 | 26 | RCSID("$OpenBSD: kexdh.c,v 1.20 2005/11/04 05:15:59 djm Exp $"); |
0bc35151 | 27 | |
98a58eda | 28 | #include <openssl/evp.h> |
0bc35151 | 29 | |
0bc35151 | 30 | #include "buffer.h" |
31 | #include "bufaux.h" | |
0bc35151 | 32 | #include "ssh2.h" |
98a58eda | 33 | #include "kex.h" |
0bc35151 | 34 | |
47e5dc72 | 35 | void |
0bc35151 | 36 | kex_dh_hash( |
37 | char *client_version_string, | |
38 | char *server_version_string, | |
39 | char *ckexinit, int ckexinitlen, | |
40 | char *skexinit, int skexinitlen, | |
cf54363d | 41 | u_char *serverhostkeyblob, int sbloblen, |
0bc35151 | 42 | BIGNUM *client_dh_pub, |
43 | BIGNUM *server_dh_pub, | |
47e5dc72 | 44 | BIGNUM *shared_secret, |
45 | u_char **hash, u_int *hashlen) | |
0bc35151 | 46 | { |
47 | Buffer b; | |
48 | static u_char digest[EVP_MAX_MD_SIZE]; | |
714954dc | 49 | const EVP_MD *evp_md = EVP_sha1(); |
0bc35151 | 50 | EVP_MD_CTX md; |
51 | ||
52 | buffer_init(&b); | |
449c5ba5 | 53 | buffer_put_cstring(&b, client_version_string); |
54 | buffer_put_cstring(&b, server_version_string); | |
0bc35151 | 55 | |
56 | /* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */ | |
57 | buffer_put_int(&b, ckexinitlen+1); | |
58 | buffer_put_char(&b, SSH2_MSG_KEXINIT); | |
59 | buffer_append(&b, ckexinit, ckexinitlen); | |
60 | buffer_put_int(&b, skexinitlen+1); | |
61 | buffer_put_char(&b, SSH2_MSG_KEXINIT); | |
62 | buffer_append(&b, skexinit, skexinitlen); | |
63 | ||
64 | buffer_put_string(&b, serverhostkeyblob, sbloblen); | |
65 | buffer_put_bignum2(&b, client_dh_pub); | |
66 | buffer_put_bignum2(&b, server_dh_pub); | |
67 | buffer_put_bignum2(&b, shared_secret); | |
68 | ||
69 | #ifdef DEBUG_KEX | |
70 | buffer_dump(&b); | |
71 | #endif | |
72 | EVP_DigestInit(&md, evp_md); | |
73 | EVP_DigestUpdate(&md, buffer_ptr(&b), buffer_len(&b)); | |
74 | EVP_DigestFinal(&md, digest, NULL); | |
75 | ||
76 | buffer_free(&b); | |
77 | ||
78 | #ifdef DEBUG_KEX | |
a209a158 | 79 | dump_digest("hash", digest, EVP_MD_size(evp_md)); |
0bc35151 | 80 | #endif |
47e5dc72 | 81 | *hash = digest; |
82 | *hashlen = EVP_MD_size(evp_md); | |
0bc35151 | 83 | } |