Annotation of src/usr.bin/ssh/kexdh.c, Revision 1.23
1.23 ! deraadt 1: /* $OpenBSD: kexdh.c,v 1.22 2006/03/25 13:17:02 djm 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"
37:
1.20 djm 38: void
1.1 markus 39: kex_dh_hash(
40: char *client_version_string,
41: char *server_version_string,
42: char *ckexinit, int ckexinitlen,
43: char *skexinit, int skexinitlen,
1.7 stevesk 44: u_char *serverhostkeyblob, int sbloblen,
1.1 markus 45: BIGNUM *client_dh_pub,
46: BIGNUM *server_dh_pub,
1.20 djm 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];
1.17 markus 52: const EVP_MD *evp_md = EVP_sha1();
1.1 markus 53: EVP_MD_CTX md;
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
75: EVP_DigestInit(&md, evp_md);
76: EVP_DigestUpdate(&md, buffer_ptr(&b), buffer_len(&b));
77: EVP_DigestFinal(&md, digest, NULL);
78:
79: buffer_free(&b);
80:
81: #ifdef DEBUG_KEX
1.13 markus 82: dump_digest("hash", digest, EVP_MD_size(evp_md));
1.1 markus 83: #endif
1.20 djm 84: *hash = digest;
85: *hashlen = EVP_MD_size(evp_md);
1.1 markus 86: }