Annotation of src/usr.bin/ssh/kexgex.c, Revision 1.23.12.1
1.1 markus 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"
1.23.12.1! brad 27: RCSID("$OpenBSD: kexgex.c,v 1.24 2005/11/04 05:15:59 djm Exp $");
1.1 markus 28:
1.23 markus 29: #include <openssl/evp.h>
1.1 markus 30:
31: #include "buffer.h"
32: #include "bufaux.h"
33: #include "kex.h"
34: #include "ssh2.h"
35:
1.23.12.1! brad 36: void
1.1 markus 37: kexgex_hash(
1.23.12.1! brad 38: const EVP_MD *evp_md,
1.1 markus 39: char *client_version_string,
40: char *server_version_string,
41: char *ckexinit, int ckexinitlen,
42: char *skexinit, int skexinitlen,
1.9 stevesk 43: u_char *serverhostkeyblob, int sbloblen,
1.1 markus 44: int min, int wantbits, int max, BIGNUM *prime, BIGNUM *gen,
45: BIGNUM *client_dh_pub,
46: BIGNUM *server_dh_pub,
1.23.12.1! brad 47: BIGNUM *shared_secret,
! 48: u_char **hash, u_int *hashlen)
1.1 markus 49: {
50: Buffer b;
51: static u_char digest[EVP_MAX_MD_SIZE];
52: EVP_MD_CTX md;
53:
54: buffer_init(&b);
1.6 markus 55: buffer_put_cstring(&b, client_version_string);
56: buffer_put_cstring(&b, server_version_string);
1.1 markus 57:
58: /* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */
59: buffer_put_int(&b, ckexinitlen+1);
60: buffer_put_char(&b, SSH2_MSG_KEXINIT);
61: buffer_append(&b, ckexinit, ckexinitlen);
62: buffer_put_int(&b, skexinitlen+1);
63: buffer_put_char(&b, SSH2_MSG_KEXINIT);
64: buffer_append(&b, skexinit, skexinitlen);
65:
66: buffer_put_string(&b, serverhostkeyblob, sbloblen);
1.5 markus 67: if (min == -1 || max == -1)
1.1 markus 68: buffer_put_int(&b, wantbits);
69: else {
70: buffer_put_int(&b, min);
71: buffer_put_int(&b, wantbits);
72: buffer_put_int(&b, max);
73: }
74: buffer_put_bignum2(&b, prime);
75: buffer_put_bignum2(&b, gen);
76: buffer_put_bignum2(&b, client_dh_pub);
77: buffer_put_bignum2(&b, server_dh_pub);
78: buffer_put_bignum2(&b, shared_secret);
79:
80: #ifdef DEBUG_KEXDH
81: buffer_dump(&b);
82: #endif
1.23.12.1! brad 83:
1.1 markus 84: EVP_DigestInit(&md, evp_md);
85: EVP_DigestUpdate(&md, buffer_ptr(&b), buffer_len(&b));
86: EVP_DigestFinal(&md, digest, NULL);
87:
88: buffer_free(&b);
1.23.12.1! brad 89: *hash = digest;
! 90: *hashlen = EVP_MD_size(evp_md);
1.1 markus 91: #ifdef DEBUG_KEXDH
1.23.12.1! brad 92: dump_digest("hash", digest, *hashlen);
1.1 markus 93: #endif
94: }