1 /* $OpenBSD: gendh.c,v 1.6 2015/10/10 22:28:51 doug Exp $ */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
59 #include <openssl/opensslconf.h>
61 /* Until the key-gen callbacks are modified to use newer prototypes, we allow
62 * deprecated functions for openssl-internal code */
63 #ifdef OPENSSL_NO_DEPRECATED
64 #undef OPENSSL_NO_DEPRECATED
69 #include <sys/types.h>
78 #include <openssl/bio.h>
79 #include <openssl/bn.h>
80 #include <openssl/dh.h>
81 #include <openssl/err.h>
82 #include <openssl/pem.h>
83 #include <openssl/x509.h>
87 static int dh_cb(int p, int n, BN_GENCB * cb);
94 static struct option gendh_options[] = {
97 .desc = "Generate DH parameters with a generator value of 2 "
101 .opt.value = &gendh_config.g,
105 .desc = "Generate DH parameters with a generator value of 5",
106 .type = OPTION_VALUE,
108 .opt.value = &gendh_config.g,
113 .desc = "Output file (default stdout)",
115 .opt.arg = &gendh_config.outfile,
124 "usage: gendh [-2 | -5] [-out file] [numbits]\n\n");
125 options_usage(gendh_options);
129 gendh_main(int argc, char **argv)
133 int ret = 1, numbits = DEFBITS;
135 char *strbits = NULL;
137 if (single_execution) {
138 if (pledge("stdio rpath wpath cpath", NULL) == -1) {
144 BN_GENCB_set(&cb, dh_cb, bio_err);
146 memset(&gendh_config, 0, sizeof(gendh_config));
150 if (options_parse(argc, argv, gendh_options, &strbits, NULL) != 0) {
155 if (strbits != NULL) {
157 numbits = strtonum(strbits, 0, INT_MAX, &errstr);
159 fprintf(stderr, "Invalid number of bits: %s\n", errstr);
164 out = BIO_new(BIO_s_file());
166 ERR_print_errors(bio_err);
169 if (gendh_config.outfile == NULL) {
170 BIO_set_fp(out, stdout, BIO_NOCLOSE);
172 if (BIO_write_filename(out, gendh_config.outfile) <= 0) {
173 perror(gendh_config.outfile);
178 BIO_printf(bio_err, "Generating DH parameters, %d bit long safe prime,"
179 " generator %d\n", numbits, gendh_config.g);
180 BIO_printf(bio_err, "This is going to take a long time\n");
182 if (((dh = DH_new()) == NULL) ||
183 !DH_generate_parameters_ex(dh, numbits, gendh_config.g, &cb))
186 if (!PEM_write_bio_DHparams(out, dh))
191 ERR_print_errors(bio_err);
201 dh_cb(int p, int n, BN_GENCB * cb)
213 BIO_write(cb->arg, &c, 1);
214 (void) BIO_flush(cb->arg);