gendh.c revision 296465 
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 512
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# ifndef OPENSSL_NO_ENGINE
100    char *engine = NULL;
101# endif
102    BIO *out = NULL;
103
104    apps_startup();
105
106    BN_GENCB_set(&cb, dh_cb, bio_err);
107    if (bio_err == NULL)
108        if ((bio_err = BIO_new(BIO_s_file())) != NULL)
109            BIO_set_fp(bio_err, stderr, BIO_NOCLOSE | BIO_FP_TEXT);
110
111    if (!load_config(bio_err, NULL))
112        goto end;
113
114    argv++;
115    argc--;
116    for (;;) {
117        if (argc <= 0)
118            break;
119        if (strcmp(*argv, "-out") == 0) {
120            if (--argc < 1)
121                goto bad;
122            outfile = *(++argv);
123        } else if (strcmp(*argv, "-2") == 0)
124            g = 2;
125/*-     else if (strcmp(*argv,"-3") == 0)
126                g=3; */
127        else if (strcmp(*argv, "-5") == 0)
128            g = 5;
129# ifndef OPENSSL_NO_ENGINE
130        else if (strcmp(*argv, "-engine") == 0) {
131            if (--argc < 1)
132                goto bad;
133            engine = *(++argv);
134        }
135# endif
136        else if (strcmp(*argv, "-rand") == 0) {
137            if (--argc < 1)
138                goto bad;
139            inrand = *(++argv);
140        } else
141            break;
142        argv++;
143        argc--;
144    }
145    if ((argc >= 1) && ((sscanf(*argv, "%d", &num) == 0) || (num < 0))) {
146 bad:
147        BIO_printf(bio_err, "usage: gendh [args] [numbits]\n");
148        BIO_printf(bio_err, " -out file - output the key to 'file\n");
149        BIO_printf(bio_err, " -2        - use 2 as the generator value\n");
150        /*
151         * BIO_printf(bio_err," -3 - use 3 as the generator value\n");
152         */
153        BIO_printf(bio_err, " -5        - use 5 as the generator value\n");
154# ifndef OPENSSL_NO_ENGINE
155        BIO_printf(bio_err,
156                   " -engine e - use engine e, possibly a hardware device.\n");
157# endif
158        BIO_printf(bio_err, " -rand file%cfile%c...\n", LIST_SEPARATOR_CHAR,
159                   LIST_SEPARATOR_CHAR);
160        BIO_printf(bio_err,
161                   "           - load the file (or the files in the directory) into\n");
162        BIO_printf(bio_err, "             the random number generator\n");
163        goto end;
164    }
165# ifndef OPENSSL_NO_ENGINE
166    setup_engine(bio_err, engine, 0);
167# endif
168
169    out = BIO_new(BIO_s_file());
170    if (out == NULL) {
171        ERR_print_errors(bio_err);
172        goto end;
173    }
174
175    if (outfile == NULL) {
176        BIO_set_fp(out, stdout, BIO_NOCLOSE);
177# ifdef OPENSSL_SYS_VMS
178        {
179            BIO *tmpbio = BIO_new(BIO_f_linebuffer());
180            out = BIO_push(tmpbio, out);
181        }
182# endif
183    } else {
184        if (BIO_write_filename(out, outfile) <= 0) {
185            perror(outfile);
186            goto end;
187        }
188    }
189
190    if (!app_RAND_load_file(NULL, bio_err, 1) && inrand == NULL) {
191        BIO_printf(bio_err,
192                   "warning, not much extra random data, consider using the -rand option\n");
193    }
194    if (inrand != NULL)
195        BIO_printf(bio_err, "%ld semi-random bytes loaded\n",
196                   app_RAND_load_files(inrand));
197
198    BIO_printf(bio_err,
199               "Generating DH parameters, %d bit long safe prime, generator %d\n",
200               num, g);
201    BIO_printf(bio_err, "This is going to take a long time\n");
202
203    if (((dh = DH_new()) == NULL)
204        || !DH_generate_parameters_ex(dh, num, g, &cb))
205        goto end;
206
207    app_RAND_write_file(NULL, bio_err);
208
209    if (!PEM_write_bio_DHparams(out, dh))
210        goto end;
211    ret = 0;
212 end:
213    if (ret != 0)
214        ERR_print_errors(bio_err);
215    if (out != NULL)
216        BIO_free_all(out);
217    if (dh != NULL)
218        DH_free(dh);
219    apps_shutdown();
220    OPENSSL_EXIT(ret);
221}
222
223static int MS_CALLBACK dh_cb(int p, int n, BN_GENCB *cb)
224{
225    char c = '*';
226
227    if (p == 0)
228        c = '.';
229    if (p == 1)
230        c = '+';
231    if (p == 2)
232        c = '*';
233    if (p == 3)
234        c = '\n';
235    BIO_write(cb->arg, &c, 1);
236    (void)BIO_flush(cb->arg);
237# ifdef LINT
238    p = n;
239# endif
240    return 1;
241}
242#endif
243