Annotation of src/usr.bin/ssh/kexgex.c, Revision 1.25
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"
27:
1.23 markus 28: #include <openssl/evp.h>
1.1 markus 29:
30: #include "buffer.h"
31: #include "bufaux.h"
32: #include "kex.h"
33: #include "ssh2.h"
34:
1.24 djm 35: void
1.1 markus 36: kexgex_hash(
1.24 djm 37: const EVP_MD *evp_md,
1.1 markus 38: char *client_version_string,
39: char *server_version_string,
40: char *ckexinit, int ckexinitlen,
41: char *skexinit, int skexinitlen,
1.9 stevesk 42: u_char *serverhostkeyblob, int sbloblen,
1.1 markus 43: int min, int wantbits, int max, BIGNUM *prime, BIGNUM *gen,
44: BIGNUM *client_dh_pub,
45: BIGNUM *server_dh_pub,
1.24 djm 46: BIGNUM *shared_secret,
47: u_char **hash, u_int *hashlen)
1.1 markus 48: {
49: Buffer b;
50: static u_char digest[EVP_MAX_MD_SIZE];
51: EVP_MD_CTX md;
52:
53: buffer_init(&b);
1.6 markus 54: buffer_put_cstring(&b, client_version_string);
55: buffer_put_cstring(&b, server_version_string);
1.1 markus 56:
57: /* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */
58: buffer_put_int(&b, ckexinitlen+1);
59: buffer_put_char(&b, SSH2_MSG_KEXINIT);
60: buffer_append(&b, ckexinit, ckexinitlen);
61: buffer_put_int(&b, skexinitlen+1);
62: buffer_put_char(&b, SSH2_MSG_KEXINIT);
63: buffer_append(&b, skexinit, skexinitlen);
64:
65: buffer_put_string(&b, serverhostkeyblob, sbloblen);
1.5 markus 66: if (min == -1 || max == -1)
1.1 markus 67: buffer_put_int(&b, wantbits);
68: else {
69: buffer_put_int(&b, min);
70: buffer_put_int(&b, wantbits);
71: buffer_put_int(&b, max);
72: }
73: buffer_put_bignum2(&b, prime);
74: buffer_put_bignum2(&b, gen);
75: buffer_put_bignum2(&b, client_dh_pub);
76: buffer_put_bignum2(&b, server_dh_pub);
77: buffer_put_bignum2(&b, shared_secret);
78:
79: #ifdef DEBUG_KEXDH
80: buffer_dump(&b);
81: #endif
1.24 djm 82:
1.1 markus 83: EVP_DigestInit(&md, evp_md);
84: EVP_DigestUpdate(&md, buffer_ptr(&b), buffer_len(&b));
85: EVP_DigestFinal(&md, digest, NULL);
86:
87: buffer_free(&b);
1.24 djm 88: *hash = digest;
89: *hashlen = EVP_MD_size(evp_md);
1.1 markus 90: #ifdef DEBUG_KEXDH
1.24 djm 91: dump_digest("hash", digest, *hashlen);
1.1 markus 92: #endif
93: }