1 /* ====================================================================
2 * Copyright (c) 1998-2002 The OpenSSL Project. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in
13 * the documentation and/or other materials provided with the
14 * distribution.
15 *
16 * 3. All advertising materials mentioning features or use of this
17 * software must display the following acknowledgment:
18 * "This product includes software developed by the OpenSSL Project
19 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
20 *
21 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
22 * endorse or promote products derived from this software without
23 * prior written permission. For written permission, please contact
24 * openssl-core@openssl.org.
25 *
26 * 5. Products derived from this software may not be called "OpenSSL"
27 * nor may "OpenSSL" appear in their names without prior written
28 * permission of the OpenSSL Project.
29 *
30 * 6. Redistributions of any form whatsoever must retain the following
31 * acknowledgment:
32 * "This product includes software developed by the OpenSSL Project
33 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
34 *
35 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
36 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
37 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
38 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
39 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
41 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
42 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
43 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
44 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
45 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
46 * OF THE POSSIBILITY OF SUCH DAMAGE.
47 * ====================================================================
48 *
49 * This product includes cryptographic software written by Eric Young
50 * (eay@cryptsoft.com). This product includes software written by Tim
51 * Hudson (tjh@cryptsoft.com). */
52
53 #include <openssl/bn.h>
54 #include <openssl/dh.h>
55
56
57 struct wrapped_callback {
58 void (*callback)(int, int, void *);
59 void *arg;
60 };
61
62 // callback_wrapper converts an “old” style generation callback to the newer
63 // |BN_GENCB| form.
callback_wrapper(int event,int n,BN_GENCB * gencb)64 static int callback_wrapper(int event, int n, BN_GENCB *gencb) {
65 struct wrapped_callback *wrapped = (struct wrapped_callback *) gencb->arg;
66 wrapped->callback(event, n, wrapped->arg);
67 return 1;
68 }
69
DH_generate_parameters(int prime_len,int generator,void (* callback)(int,int,void *),void * cb_arg)70 DH *DH_generate_parameters(int prime_len, int generator,
71 void (*callback)(int, int, void *), void *cb_arg) {
72 if (prime_len < 0 || generator < 0) {
73 return NULL;
74 }
75
76 DH *ret = DH_new();
77 if (ret == NULL) {
78 return NULL;
79 }
80
81 BN_GENCB gencb_storage;
82 BN_GENCB *cb = NULL;
83
84 struct wrapped_callback wrapped;
85
86 if (callback != NULL) {
87 wrapped.callback = callback;
88 wrapped.arg = cb_arg;
89
90 cb = &gencb_storage;
91 BN_GENCB_set(cb, callback_wrapper, &wrapped);
92 }
93
94 if (!DH_generate_parameters_ex(ret, prime_len, generator, cb)) {
95 goto err;
96 }
97
98 return ret;
99
100 err:
101 DH_free(ret);
102 return NULL;
103 }
104