gendh.c revision 312826 
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/*
62 * Until the key-gen callbacks are modified to use newer prototypes, we allow
63 * deprecated functions for openssl-internal code
64 */
65#ifdef OPENSSL_NO_DEPRECATED
66# undef OPENSSL_NO_DEPRECATED
67#endif
68
69#ifndef OPENSSL_NO_DH
70# include <stdio.h>
71# include <string.h>
72# include <sys/types.h>
73# include <sys/stat.h>
74# include "apps.h"
75# include <openssl/bio.h>
76# include <openssl/rand.h>
77# include <openssl/err.h>
78# include <openssl/bn.h>
79# include <openssl/dh.h>
80# include <openssl/x509.h>
81# include <openssl/pem.h>
82
83# define DEFBITS 2048
84# undef PROG
85# define PROG gendh_main
86
87static int MS_CALLBACK dh_cb(int p, int n, BN_GENCB *cb);
88
89int MAIN(int, char **);
90
91int MAIN(int argc, char **argv)
92{
93    BN_GENCB cb;
94    DH *dh = NULL;
95    int ret = 1, num = DEFBITS;
96    int g = 2;
97    char *outfile = NULL;
98    char *inrand = NULL;
99    char *engine = NULL;
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        if (argc <= 0)
116            break;
117        if (strcmp(*argv, "-out") == 0) {
118            if (--argc < 1)
119                goto bad;
120            outfile = *(++argv);
121        } else if (strcmp(*argv, "-2") == 0)
122            g = 2;
123/*-     else if (strcmp(*argv,"-3") == 0)
124                g=3; */
125        else if (strcmp(*argv, "-5") == 0)
126            g = 5;
127# ifndef OPENSSL_NO_ENGINE
128        else if (strcmp(*argv, "-engine") == 0) {
129            if (--argc < 1)
130                goto bad;
131            engine = *(++argv);
132        }
133# endif
134        else if (strcmp(*argv, "-rand") == 0) {
135            if (--argc < 1)
136                goto bad;
137            inrand = *(++argv);
138        } else
139            break;
140        argv++;
141        argc--;
142    }
143    if ((argc >= 1) && ((sscanf(*argv, "%d", &num) == 0) || (num < 0))) {
144 bad:
145        BIO_printf(bio_err, "usage: gendh [args] [numbits]\n");
146        BIO_printf(bio_err, " -out file - output the key to 'file\n");
147        BIO_printf(bio_err, " -2        - use 2 as the generator value\n");
148        /*
149         * BIO_printf(bio_err," -3 - use 3 as the generator value\n");
150         */
151        BIO_printf(bio_err, " -5        - use 5 as the generator value\n");
152# ifndef OPENSSL_NO_ENGINE
153        BIO_printf(bio_err,
154                   " -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,
157                   LIST_SEPARATOR_CHAR);
158        BIO_printf(bio_err,
159                   "           - load the file (or the files in the directory) into\n");
160        BIO_printf(bio_err, "             the random number generator\n");
161        goto end;
162    }
163    setup_engine(bio_err, engine, 0);
164
165    out = BIO_new(BIO_s_file());
166    if (out == NULL) {
167        ERR_print_errors(bio_err);
168        goto end;
169    }
170
171    if (outfile == NULL) {
172        BIO_set_fp(out, stdout, BIO_NOCLOSE);
173# ifdef OPENSSL_SYS_VMS
174        {
175            BIO *tmpbio = BIO_new(BIO_f_linebuffer());
176            out = BIO_push(tmpbio, out);
177        }
178# endif
179    } else {
180        if (BIO_write_filename(out, outfile) <= 0) {
181            perror(outfile);
182            goto end;
183        }
184    }
185
186    if (!app_RAND_load_file(NULL, bio_err, 1) && inrand == NULL) {
187        BIO_printf(bio_err,
188                   "warning, not much extra random data, consider using the -rand option\n");
189    }
190    if (inrand != NULL)
191        BIO_printf(bio_err, "%ld semi-random bytes loaded\n",
192                   app_RAND_load_files(inrand));
193
194    BIO_printf(bio_err,
195               "Generating DH parameters, %d bit long safe prime, generator %d\n",
196               num, g);
197    BIO_printf(bio_err, "This is going to take a long time\n");
198
199    if (((dh = DH_new()) == NULL)
200        || !DH_generate_parameters_ex(dh, num, g, &cb))
201        goto end;
202
203    app_RAND_write_file(NULL, bio_err);
204
205    if (!PEM_write_bio_DHparams(out, dh))
206        goto end;
207    ret = 0;
208 end:
209    if (ret != 0)
210        ERR_print_errors(bio_err);
211    if (out != NULL)
212        BIO_free_all(out);
213    if (dh != NULL)
214        DH_free(dh);
215    apps_shutdown();
216    OPENSSL_EXIT(ret);
217}
218
219static int MS_CALLBACK dh_cb(int p, int n, BN_GENCB *cb)
220{
221    char c = '*';
222
223    if (p == 0)
224        c = '.';
225    if (p == 1)
226        c = '+';
227    if (p == 2)
228        c = '*';
229    if (p == 3)
230        c = '\n';
231    BIO_write(cb->arg, &c, 1);
232    (void)BIO_flush(cb->arg);
233# ifdef LINT
234    p = n;
235# endif
236    return 1;
237}
238#else                           /* !OPENSSL_NO_DH */
239
240# if PEDANTIC
241static void *dummy = &dummy;
242# endif
243
244#endif
245