1/* apps/gendh.c */
2/* obsoleted by dhparam.c */
3/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
4 * All rights reserved.
5 *
6 * This package is an SSL implementation written
7 * by Eric Young (eay@cryptsoft.com).
8 * The implementation was written so as to conform with Netscapes SSL.
9 *
10 * This library is free for commercial and non-commercial use as long as
11 * the following conditions are aheared to.  The following conditions
12 * apply to all code found in this distribution, be it the RC4, RSA,
13 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
14 * included with this distribution is covered by the same copyright terms
15 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
16 *
17 * Copyright remains Eric Young's, and as such any Copyright notices in
18 * the code are not to be removed.
19 * If this package is used in a product, Eric Young should be given attribution
20 * as the author of the parts of the library used.
21 * This can be in the form of a textual message at program startup or
22 * in documentation (online or textual) provided with the package.
23 *
24 * Redistribution and use in source and binary forms, with or without
25 * modification, are permitted provided that the following conditions
26 * are met:
27 * 1. Redistributions of source code must retain the copyright
28 *    notice, this list of conditions and the following disclaimer.
29 * 2. Redistributions in binary form must reproduce the above copyright
30 *    notice, this list of conditions and the following disclaimer in the
31 *    documentation and/or other materials provided with the distribution.
32 * 3. All advertising materials mentioning features or use of this software
33 *    must display the following acknowledgement:
34 *    "This product includes cryptographic software written by
35 *     Eric Young (eay@cryptsoft.com)"
36 *    The word 'cryptographic' can be left out if the rouines from the library
37 *    being used are not cryptographic related :-).
38 * 4. If you include any Windows specific code (or a derivative thereof) from
39 *    the apps directory (application code) you must include an acknowledgement:
40 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
41 *
42 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
43 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
44 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
45 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
46 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
47 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
48 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
49 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
50 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
51 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
52 * SUCH DAMAGE.
53 *
54 * The licence and distribution terms for any publically available version or
55 * derivative of this code cannot be changed.  i.e. this code cannot simply be
56 * copied and put under another distribution licence
57 * [including the GNU Public Licence.]
58 */
59
60#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
65#endif
66
67#ifndef OPENSSL_NO_DH
68#include <stdio.h>
69#include <string.h>
70#include <sys/types.h>
71#include <sys/stat.h>
72#include "apps.h"
73#include <openssl/bio.h>
74#include <openssl/rand.h>
75#include <openssl/err.h>
76#include <openssl/bn.h>
77#include <openssl/dh.h>
78#include <openssl/x509.h>
79#include <openssl/pem.h>
80
81#define DEFBITS	512
82#undef PROG
83#define PROG gendh_main
84
85static int MS_CALLBACK dh_cb(int p, int n, BN_GENCB *cb);
86
87int MAIN(int, char **);
88
89int MAIN(int argc, char **argv)
90	{
91	BN_GENCB cb;
92	DH *dh=NULL;
93	int ret=1,num=DEFBITS;
94	int g=2;
95	char *outfile=NULL;
96	char *inrand=NULL;
97#ifndef OPENSSL_NO_ENGINE
98	char *engine=NULL;
99#endif
100	BIO *out=NULL;
101
102	apps_startup();
103
104	BN_GENCB_set(&cb, dh_cb, bio_err);
105	if (bio_err == NULL)
106		if ((bio_err=BIO_new(BIO_s_file())) != NULL)
107			BIO_set_fp(bio_err,stderr,BIO_NOCLOSE|BIO_FP_TEXT);
108
109	if (!load_config(bio_err, NULL))
110		goto end;
111
112	argv++;
113	argc--;
114	for (;;)
115		{
116		if (argc <= 0) break;
117		if (strcmp(*argv,"-out") == 0)
118			{
119			if (--argc < 1) goto bad;
120			outfile= *(++argv);
121			}
122		else if (strcmp(*argv,"-2") == 0)
123			g=2;
124	/*	else if (strcmp(*argv,"-3") == 0)
125			g=3; */
126		else if (strcmp(*argv,"-5") == 0)
127			g=5;
128#ifndef OPENSSL_NO_ENGINE
129		else if (strcmp(*argv,"-engine") == 0)
130			{
131			if (--argc < 1) goto bad;
132			engine= *(++argv);
133			}
134#endif
135		else if (strcmp(*argv,"-rand") == 0)
136			{
137			if (--argc < 1) goto bad;
138			inrand= *(++argv);
139			}
140		else
141			break;
142		argv++;
143		argc--;
144		}
145	if ((argc >= 1) && ((sscanf(*argv,"%d",&num) == 0) || (num < 0)))
146		{
147bad:
148		BIO_printf(bio_err,"usage: gendh [args] [numbits]\n");
149		BIO_printf(bio_err," -out file - output the key to 'file\n");
150		BIO_printf(bio_err," -2        - use 2 as the generator value\n");
151	/*	BIO_printf(bio_err," -3        - use 3 as the generator value\n"); */
152		BIO_printf(bio_err," -5        - use 5 as the generator value\n");
153#ifndef OPENSSL_NO_ENGINE
154		BIO_printf(bio_err," -engine e - use engine e, possibly a hardware device.\n");
155#endif
156		BIO_printf(bio_err," -rand file%cfile%c...\n", LIST_SEPARATOR_CHAR, LIST_SEPARATOR_CHAR);
157		BIO_printf(bio_err,"           - load the file (or the files in the directory) into\n");
158		BIO_printf(bio_err,"             the random number generator\n");
159		goto end;
160		}
161
162#ifndef OPENSSL_NO_ENGINE
163        setup_engine(bio_err, engine, 0);
164#endif
165
166	out=BIO_new(BIO_s_file());
167	if (out == NULL)
168		{
169		ERR_print_errors(bio_err);
170		goto end;
171		}
172
173	if (outfile == NULL)
174		{
175		BIO_set_fp(out,stdout,BIO_NOCLOSE);
176#ifdef OPENSSL_SYS_VMS
177		{
178		BIO *tmpbio = BIO_new(BIO_f_linebuffer());
179		out = BIO_push(tmpbio, out);
180		}
181#endif
182		}
183	else
184		{
185		if (BIO_write_filename(out,outfile) <= 0)
186			{
187			perror(outfile);
188			goto end;
189			}
190		}
191
192	if (!app_RAND_load_file(NULL, bio_err, 1) && inrand == NULL)
193		{
194		BIO_printf(bio_err,"warning, not much extra random data, consider using the -rand option\n");
195		}
196	if (inrand != NULL)
197		BIO_printf(bio_err,"%ld semi-random bytes loaded\n",
198			app_RAND_load_files(inrand));
199
200	BIO_printf(bio_err,"Generating DH parameters, %d bit long safe prime, generator %d\n",num,g);
201	BIO_printf(bio_err,"This is going to take a long time\n");
202
203	if(((dh = DH_new()) == NULL) || !DH_generate_parameters_ex(dh, num, g, &cb))
204		goto end;
205
206	app_RAND_write_file(NULL, bio_err);
207
208	if (!PEM_write_bio_DHparams(out,dh))
209		goto end;
210	ret=0;
211end:
212	if (ret != 0)
213		ERR_print_errors(bio_err);
214	if (out != NULL) BIO_free_all(out);
215	if (dh != NULL) DH_free(dh);
216	apps_shutdown();
217	OPENSSL_EXIT(ret);
218	}
219
220static int MS_CALLBACK dh_cb(int p, int n, BN_GENCB *cb)
221	{
222	char c='*';
223
224	if (p == 0) c='.';
225	if (p == 1) c='+';
226	if (p == 2) c='*';
227	if (p == 3) c='\n';
228	BIO_write(cb->arg,&c,1);
229	(void)BIO_flush(cb->arg);
230#ifdef LINT
231	p=n;
232#endif
233	return 1;
234	}
235#else /* !OPENSSL_NO_DH */
236
237# if PEDANTIC
238static void *dummy=&dummy;
239# endif
240
241#endif
242