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1 | /* | |
2 | * Copyright (c) 2000 Niels Provos. All rights reserved. | |
3 | * Copyright (c) 2001 Markus Friedl. All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
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. | |
13 | * | |
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. | |
24 | */ | |
25 | ||
26 | #include "includes.h" | |
27 | RCSID("$OpenBSD: kexgex.c,v 1.23 2003/02/16 17:09:57 markus Exp $"); | |
28 | ||
29 | #include <openssl/evp.h> | |
30 | ||
31 | #include "buffer.h" | |
32 | #include "bufaux.h" | |
33 | #include "kex.h" | |
34 | #include "ssh2.h" | |
35 | ||
36 | u_char * | |
37 | kexgex_hash( | |
38 | char *client_version_string, | |
39 | char *server_version_string, | |
40 | char *ckexinit, int ckexinitlen, | |
41 | char *skexinit, int skexinitlen, | |
42 | u_char *serverhostkeyblob, int sbloblen, | |
43 | int min, int wantbits, int max, BIGNUM *prime, BIGNUM *gen, | |
44 | BIGNUM *client_dh_pub, | |
45 | BIGNUM *server_dh_pub, | |
46 | BIGNUM *shared_secret) | |
47 | { | |
48 | Buffer b; | |
49 | static u_char digest[EVP_MAX_MD_SIZE]; | |
50 | const EVP_MD *evp_md = EVP_sha1(); | |
51 | EVP_MD_CTX md; | |
52 | ||
53 | buffer_init(&b); | |
54 | buffer_put_cstring(&b, client_version_string); | |
55 | buffer_put_cstring(&b, server_version_string); | |
56 | ||
57 | /* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */ | |
58 | buffer_put_int(&b, ckexinitlen+1); | |
59 | buffer_put_char(&b, SSH2_MSG_KEXINIT); | |
60 | buffer_append(&b, ckexinit, ckexinitlen); | |
61 | buffer_put_int(&b, skexinitlen+1); | |
62 | buffer_put_char(&b, SSH2_MSG_KEXINIT); | |
63 | buffer_append(&b, skexinit, skexinitlen); | |
64 | ||
65 | buffer_put_string(&b, serverhostkeyblob, sbloblen); | |
66 | if (min == -1 || max == -1) | |
67 | buffer_put_int(&b, wantbits); | |
68 | else { | |
69 | buffer_put_int(&b, min); | |
70 | buffer_put_int(&b, wantbits); | |
71 | buffer_put_int(&b, max); | |
72 | } | |
73 | buffer_put_bignum2(&b, prime); | |
74 | buffer_put_bignum2(&b, gen); | |
75 | buffer_put_bignum2(&b, client_dh_pub); | |
76 | buffer_put_bignum2(&b, server_dh_pub); | |
77 | buffer_put_bignum2(&b, shared_secret); | |
78 | ||
79 | #ifdef DEBUG_KEXDH | |
80 | buffer_dump(&b); | |
81 | #endif | |
82 | EVP_DigestInit(&md, evp_md); | |
83 | EVP_DigestUpdate(&md, buffer_ptr(&b), buffer_len(&b)); | |
84 | EVP_DigestFinal(&md, digest, NULL); | |
85 | ||
86 | buffer_free(&b); | |
87 | ||
88 | #ifdef DEBUG_KEXDH | |
89 | dump_digest("hash", digest, EVP_MD_size(evp_md)); | |
90 | #endif | |
91 | return digest; | |
92 | } |