Annotation of src/usr.bin/ssh/kexgex.c, Revision 1.28
1.28 ! djm 1: /* $OpenBSD: kexgex.c,v 1.27 2006/08/03 03:34:42 deraadt Exp $ */
1.1 markus 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:
1.27 deraadt 27: #include <sys/types.h>
1.1 markus 28:
1.23 markus 29: #include <openssl/evp.h>
1.27 deraadt 30: #include <signal.h>
1.1 markus 31:
32: #include "buffer.h"
1.27 deraadt 33: #include "key.h"
34: #include "cipher.h"
1.1 markus 35: #include "kex.h"
36: #include "ssh2.h"
1.28 ! djm 37: #include "digest.h"
! 38: #include "log.h"
1.1 markus 39:
1.24 djm 40: void
1.1 markus 41: kexgex_hash(
1.28 ! djm 42: int hash_alg,
1.1 markus 43: char *client_version_string,
44: char *server_version_string,
45: char *ckexinit, int ckexinitlen,
46: char *skexinit, int skexinitlen,
1.9 stevesk 47: u_char *serverhostkeyblob, int sbloblen,
1.1 markus 48: int min, int wantbits, int max, BIGNUM *prime, BIGNUM *gen,
49: BIGNUM *client_dh_pub,
50: BIGNUM *server_dh_pub,
1.24 djm 51: BIGNUM *shared_secret,
52: u_char **hash, u_int *hashlen)
1.1 markus 53: {
54: Buffer b;
1.28 ! djm 55: static u_char digest[SSH_DIGEST_MAX_LENGTH];
1.1 markus 56:
57: buffer_init(&b);
1.6 markus 58: buffer_put_cstring(&b, client_version_string);
59: buffer_put_cstring(&b, server_version_string);
1.1 markus 60:
61: /* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */
62: buffer_put_int(&b, ckexinitlen+1);
63: buffer_put_char(&b, SSH2_MSG_KEXINIT);
64: buffer_append(&b, ckexinit, ckexinitlen);
65: buffer_put_int(&b, skexinitlen+1);
66: buffer_put_char(&b, SSH2_MSG_KEXINIT);
67: buffer_append(&b, skexinit, skexinitlen);
68:
69: buffer_put_string(&b, serverhostkeyblob, sbloblen);
1.5 markus 70: if (min == -1 || max == -1)
1.1 markus 71: buffer_put_int(&b, wantbits);
72: else {
73: buffer_put_int(&b, min);
74: buffer_put_int(&b, wantbits);
75: buffer_put_int(&b, max);
76: }
77: buffer_put_bignum2(&b, prime);
78: buffer_put_bignum2(&b, gen);
79: buffer_put_bignum2(&b, client_dh_pub);
80: buffer_put_bignum2(&b, server_dh_pub);
81: buffer_put_bignum2(&b, shared_secret);
82:
83: #ifdef DEBUG_KEXDH
84: buffer_dump(&b);
85: #endif
1.28 ! djm 86: if (ssh_digest_buffer(hash_alg, &b, digest, sizeof(digest)) != 0)
! 87: fatal("%s: ssh_digest_buffer failed", __func__);
1.24 djm 88:
1.28 ! djm 89: buffer_free(&b);
1.1 markus 90:
1.28 ! djm 91: #ifdef DEBUG_KEX
! 92: dump_digest("hash", digest, ssh_digest_bytes(hash_alg));
! 93: #endif
1.24 djm 94: *hash = digest;
1.28 ! djm 95: *hashlen = ssh_digest_bytes(hash_alg);
1.1 markus 96: }