Annotation of src/usr.bin/ssh/kexdh.c, Revision 1.24
1.24 ! djm 1: /* $OpenBSD: kexdh.c,v 1.23 2006/08/03 03:34:42 deraadt Exp $ */
1.1 markus 2: /*
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:
1.23 deraadt 26: #include <sys/types.h>
27:
28: #include <signal.h>
1.1 markus 29:
1.19 markus 30: #include <openssl/evp.h>
1.1 markus 31:
32: #include "buffer.h"
1.19 markus 33: #include "ssh2.h"
1.23 deraadt 34: #include "key.h"
35: #include "cipher.h"
1.1 markus 36: #include "kex.h"
1.24 ! djm 37: #include "digest.h"
! 38: #include "log.h"
1.1 markus 39:
1.20 djm 40: void
1.1 markus 41: kex_dh_hash(
42: char *client_version_string,
43: char *server_version_string,
44: char *ckexinit, int ckexinitlen,
45: char *skexinit, int skexinitlen,
1.7 stevesk 46: u_char *serverhostkeyblob, int sbloblen,
1.1 markus 47: BIGNUM *client_dh_pub,
48: BIGNUM *server_dh_pub,
1.20 djm 49: BIGNUM *shared_secret,
50: u_char **hash, u_int *hashlen)
1.1 markus 51: {
52: Buffer b;
1.24 ! djm 53: static u_char digest[SSH_DIGEST_MAX_LENGTH];
1.1 markus 54:
55: buffer_init(&b);
1.4 markus 56: buffer_put_cstring(&b, client_version_string);
57: buffer_put_cstring(&b, server_version_string);
1.1 markus 58:
59: /* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */
60: buffer_put_int(&b, ckexinitlen+1);
61: buffer_put_char(&b, SSH2_MSG_KEXINIT);
62: buffer_append(&b, ckexinit, ckexinitlen);
63: buffer_put_int(&b, skexinitlen+1);
64: buffer_put_char(&b, SSH2_MSG_KEXINIT);
65: buffer_append(&b, skexinit, skexinitlen);
66:
67: buffer_put_string(&b, serverhostkeyblob, sbloblen);
68: buffer_put_bignum2(&b, client_dh_pub);
69: buffer_put_bignum2(&b, server_dh_pub);
70: buffer_put_bignum2(&b, shared_secret);
71:
72: #ifdef DEBUG_KEX
73: buffer_dump(&b);
74: #endif
1.24 ! djm 75: if (ssh_digest_buffer(SSH_DIGEST_SHA1, &b, digest, sizeof(digest)) != 0)
! 76: fatal("%s: ssh_digest_buffer failed", __func__);
1.1 markus 77:
78: buffer_free(&b);
79:
80: #ifdef DEBUG_KEX
1.24 ! djm 81: dump_digest("hash", digest, ssh_digest_bytes(SSH_DIGEST_SHA1));
1.1 markus 82: #endif
1.20 djm 83: *hash = digest;
1.24 ! djm 84: *hashlen = ssh_digest_bytes(SSH_DIGEST_SHA1);
1.1 markus 85: }