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31652869 | 1 | /* $OpenBSD: kexgex.c,v 1.27 2006/08/03 03:34:42 deraadt Exp $ */ |
0bc35151 | 2 | /* |
3 | * Copyright (c) 2000 Niels Provos. All rights reserved. | |
4 | * Copyright (c) 2001 Markus Friedl. All rights reserved. | |
5 | * | |
6 | * Redistribution and use in source and binary forms, with or without | |
7 | * modification, are permitted provided that the following conditions | |
8 | * are met: | |
9 | * 1. Redistributions of source code must retain the above copyright | |
10 | * notice, this list of conditions and the following disclaimer. | |
11 | * 2. Redistributions in binary form must reproduce the above copyright | |
12 | * notice, this list of conditions and the following disclaimer in the | |
13 | * documentation and/or other materials provided with the distribution. | |
14 | * | |
15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
16 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
17 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
18 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
19 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
20 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
21 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
22 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
23 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
24 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
25 | */ | |
26 | ||
27 | #include "includes.h" | |
0bc35151 | 28 | |
31652869 | 29 | #include <sys/types.h> |
30 | ||
98a58eda | 31 | #include <openssl/evp.h> |
31652869 | 32 | #include <signal.h> |
0bc35151 | 33 | |
0bc35151 | 34 | #include "buffer.h" |
31652869 | 35 | #include "key.h" |
36 | #include "cipher.h" | |
0bc35151 | 37 | #include "kex.h" |
0bc35151 | 38 | #include "ssh2.h" |
0bc35151 | 39 | |
47e5dc72 | 40 | void |
0bc35151 | 41 | kexgex_hash( |
47e5dc72 | 42 | const EVP_MD *evp_md, |
0bc35151 | 43 | char *client_version_string, |
44 | char *server_version_string, | |
45 | char *ckexinit, int ckexinitlen, | |
46 | char *skexinit, int skexinitlen, | |
cf54363d | 47 | u_char *serverhostkeyblob, int sbloblen, |
0bc35151 | 48 | int min, int wantbits, int max, BIGNUM *prime, BIGNUM *gen, |
49 | BIGNUM *client_dh_pub, | |
50 | BIGNUM *server_dh_pub, | |
47e5dc72 | 51 | BIGNUM *shared_secret, |
52 | u_char **hash, u_int *hashlen) | |
0bc35151 | 53 | { |
54 | Buffer b; | |
55 | static u_char digest[EVP_MAX_MD_SIZE]; | |
0bc35151 | 56 | EVP_MD_CTX md; |
57 | ||
58 | buffer_init(&b); | |
449c5ba5 | 59 | buffer_put_cstring(&b, client_version_string); |
60 | buffer_put_cstring(&b, server_version_string); | |
0bc35151 | 61 | |
62 | /* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */ | |
63 | buffer_put_int(&b, ckexinitlen+1); | |
64 | buffer_put_char(&b, SSH2_MSG_KEXINIT); | |
65 | buffer_append(&b, ckexinit, ckexinitlen); | |
66 | buffer_put_int(&b, skexinitlen+1); | |
67 | buffer_put_char(&b, SSH2_MSG_KEXINIT); | |
68 | buffer_append(&b, skexinit, skexinitlen); | |
69 | ||
70 | buffer_put_string(&b, serverhostkeyblob, sbloblen); | |
cd332296 | 71 | if (min == -1 || max == -1) |
0bc35151 | 72 | buffer_put_int(&b, wantbits); |
73 | else { | |
74 | buffer_put_int(&b, min); | |
75 | buffer_put_int(&b, wantbits); | |
76 | buffer_put_int(&b, max); | |
77 | } | |
78 | buffer_put_bignum2(&b, prime); | |
79 | buffer_put_bignum2(&b, gen); | |
80 | buffer_put_bignum2(&b, client_dh_pub); | |
81 | buffer_put_bignum2(&b, server_dh_pub); | |
82 | buffer_put_bignum2(&b, shared_secret); | |
83 | ||
84 | #ifdef DEBUG_KEXDH | |
85 | buffer_dump(&b); | |
86 | #endif | |
47e5dc72 | 87 | |
0bc35151 | 88 | EVP_DigestInit(&md, evp_md); |
89 | EVP_DigestUpdate(&md, buffer_ptr(&b), buffer_len(&b)); | |
90 | EVP_DigestFinal(&md, digest, NULL); | |
91 | ||
92 | buffer_free(&b); | |
47e5dc72 | 93 | *hash = digest; |
94 | *hashlen = EVP_MD_size(evp_md); | |
0bc35151 | 95 | #ifdef DEBUG_KEXDH |
47e5dc72 | 96 | dump_digest("hash", digest, *hashlen); |
0bc35151 | 97 | #endif |
0bc35151 | 98 | } |