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1/* $OpenBSD: dhparam.c,v 1.19 2025/01/19 10:24:17 tb Exp $ */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
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.
8 *
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).
15 *
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.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
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)"
40 *
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
51 * SUCH DAMAGE.
52 *
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.]
57 */
58/* ====================================================================
59 * Copyright (c) 1998-2000 The OpenSSL Project. All rights reserved.
60 *
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
63 * are met:
64 *
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
67 *
68 * 2. Redistributions in binary form must reproduce the above copyright
69 * notice, this list of conditions and the following disclaimer in
70 * the documentation and/or other materials provided with the
71 * distribution.
72 *
73 * 3. All advertising materials mentioning features or use of this
74 * software must display the following acknowledgment:
75 * "This product includes software developed by the OpenSSL Project
76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77 *
78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79 * endorse or promote products derived from this software without
80 * prior written permission. For written permission, please contact
81 * openssl-core@openssl.org.
82 *
83 * 5. Products derived from this software may not be called "OpenSSL"
84 * nor may "OpenSSL" appear in their names without prior written
85 * permission of the OpenSSL Project.
86 *
87 * 6. Redistributions of any form whatsoever must retain the following
88 * acknowledgment:
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91 *
92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103 * OF THE POSSIBILITY OF SUCH DAMAGE.
104 * ====================================================================
105 *
106 * This product includes cryptographic software written by Eric Young
107 * (eay@cryptsoft.com). This product includes software written by Tim
108 * Hudson (tjh@cryptsoft.com).
109 *
110 */
111
112#include <openssl/opensslconf.h> /* for OPENSSL_NO_DH */
113
114#ifndef OPENSSL_NO_DH
115
116#include <stdio.h>
117#include <stdlib.h>
118#include <string.h>
119#include <time.h>
120
121#include "apps.h"
122
123#include <openssl/bio.h>
124#include <openssl/bn.h>
125#include <openssl/err.h>
126#include <openssl/dh.h>
127#include <openssl/pem.h>
128#include <openssl/x509.h>
129
130#include <openssl/dsa.h>
131
132#define DEFBITS 2048
133
134static struct {
135 int check;
136 int dsaparam;
137 int g;
138 char *infile;
139 int informat;
140 int noout;
141 char *outfile;
142 int outformat;
143 int text;
144} cfg;
145
146static const struct option dhparam_options[] = {
147 {
148 .name = "2",
149 .desc = "Generate DH parameters with a generator value of 2 "
150 "(default)",
151 .type = OPTION_VALUE,
152 .opt.value = &cfg.g,
153 .value = 2,
154 },
155 {
156 .name = "5",
157 .desc = "Generate DH parameters with a generator value of 5",
158 .type = OPTION_VALUE,
159 .opt.value = &cfg.g,
160 .value = 5,
161 },
162 {
163 .name = "check",
164 .desc = "Check the DH parameters",
165 .type = OPTION_FLAG,
166 .opt.flag = &cfg.check,
167 },
168 {
169 .name = "dsaparam",
170 .desc = "Read or generate DSA parameters and convert to DH",
171 .type = OPTION_FLAG,
172 .opt.flag = &cfg.dsaparam,
173 },
174 {
175 .name = "in",
176 .argname = "file",
177 .desc = "Input file (default stdin)",
178 .type = OPTION_ARG,
179 .opt.arg = &cfg.infile,
180 },
181 {
182 .name = "inform",
183 .argname = "format",
184 .desc = "Input format (DER or PEM (default))",
185 .type = OPTION_ARG_FORMAT,
186 .opt.value = &cfg.informat,
187 },
188 {
189 .name = "noout",
190 .desc = "Do not output encoded version of DH parameters",
191 .type = OPTION_FLAG,
192 .opt.flag = &cfg.noout,
193 },
194 {
195 .name = "out",
196 .argname = "file",
197 .desc = "Output file (default stdout)",
198 .type = OPTION_ARG,
199 .opt.arg = &cfg.outfile,
200 },
201 {
202 .name = "outform",
203 .argname = "format",
204 .desc = "Output format (DER or PEM (default))",
205 .type = OPTION_ARG_FORMAT,
206 .opt.value = &cfg.outformat,
207 },
208 {
209 .name = "text",
210 .desc = "Print DH parameters in plain text",
211 .type = OPTION_FLAG,
212 .opt.flag = &cfg.text,
213 },
214 { NULL },
215};
216
217static void
218dhparam_usage(void)
219{
220 fprintf(stderr,
221 "usage: dhparam [-2 | -5] [-check] [-dsaparam]\n"
222 " [-in file] [-inform DER | PEM] [-noout] [-out file]\n"
223 " [-outform DER | PEM] [-text] [numbits]\n\n");
224 options_usage(dhparam_options);
225}
226
227static int dh_cb(int p, int n, BN_GENCB *cb);
228
229int
230dhparam_main(int argc, char **argv)
231{
232 BIO *in = NULL, *out = NULL;
233 BN_GENCB *cb = NULL;
234 char *num_bits = NULL;
235 DH *dh = NULL;
236 int num = 0;
237 int ret = 1;
238 int i;
239
240 if (pledge("stdio cpath wpath rpath", NULL) == -1) {
241 perror("pledge");
242 exit(1);
243 }
244
245 memset(&cfg, 0, sizeof(cfg));
246
247 cfg.informat = FORMAT_PEM;
248 cfg.outformat = FORMAT_PEM;
249
250 if (options_parse(argc, argv, dhparam_options, &num_bits, NULL) != 0) {
251 dhparam_usage();
252 return (1);
253 }
254
255 if (num_bits != NULL) {
256 if(sscanf(num_bits, "%d", &num) == 0 || num <= 0) {
257 BIO_printf(bio_err, "invalid number of bits: %s\n",
258 num_bits);
259 return (1);
260 }
261 }
262
263 if (cfg.g && !num)
264 num = DEFBITS;
265
266 if (cfg.dsaparam) {
267 if (cfg.g) {
268 BIO_printf(bio_err, "generator may not be chosen for DSA parameters\n");
269 goto end;
270 }
271 } else {
272 /* DH parameters */
273 if (num && !cfg.g)
274 cfg.g = 2;
275 }
276
277 if (num) {
278 if ((cb = BN_GENCB_new()) == NULL) {
279 BIO_printf(bio_err,
280 "Error allocating BN_GENCB object\n");
281 goto end;
282 }
283
284 BN_GENCB_set(cb, dh_cb, bio_err);
285 if (cfg.dsaparam) {
286 DSA *dsa = DSA_new();
287
288 BIO_printf(bio_err, "Generating DSA parameters, %d bit long prime\n", num);
289 if (!dsa || !DSA_generate_parameters_ex(dsa, num,
290 NULL, 0, NULL, NULL, cb)) {
291 DSA_free(dsa);
292 ERR_print_errors(bio_err);
293 goto end;
294 }
295 dh = DSA_dup_DH(dsa);
296 DSA_free(dsa);
297 if (dh == NULL) {
298 ERR_print_errors(bio_err);
299 goto end;
300 }
301 } else {
302 dh = DH_new();
303 BIO_printf(bio_err, "Generating DH parameters, %d bit long safe prime, generator %d\n", num, cfg.g);
304 BIO_printf(bio_err, "This is going to take a long time\n");
305 if (!dh || !DH_generate_parameters_ex(dh, num, cfg.g, cb)) {
306 ERR_print_errors(bio_err);
307 goto end;
308 }
309 }
310 } else {
311
312 in = BIO_new(BIO_s_file());
313 if (in == NULL) {
314 ERR_print_errors(bio_err);
315 goto end;
316 }
317 if (cfg.infile == NULL)
318 BIO_set_fp(in, stdin, BIO_NOCLOSE);
319 else {
320 if (BIO_read_filename(in, cfg.infile) <= 0) {
321 perror(cfg.infile);
322 goto end;
323 }
324 }
325
326 if (cfg.informat != FORMAT_ASN1 &&
327 cfg.informat != FORMAT_PEM) {
328 BIO_printf(bio_err, "bad input format specified\n");
329 goto end;
330 }
331 if (cfg.dsaparam) {
332 DSA *dsa;
333
334 if (cfg.informat == FORMAT_ASN1)
335 dsa = d2i_DSAparams_bio(in, NULL);
336 else /* informat == FORMAT_PEM */
337 dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL);
338
339 if (dsa == NULL) {
340 BIO_printf(bio_err, "unable to load DSA parameters\n");
341 ERR_print_errors(bio_err);
342 goto end;
343 }
344 dh = DSA_dup_DH(dsa);
345 DSA_free(dsa);
346 if (dh == NULL) {
347 ERR_print_errors(bio_err);
348 goto end;
349 }
350 } else
351 {
352 if (cfg.informat == FORMAT_ASN1)
353 dh = d2i_DHparams_bio(in, NULL);
354 else /* informat == FORMAT_PEM */
355 dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
356
357 if (dh == NULL) {
358 BIO_printf(bio_err, "unable to load DH parameters\n");
359 ERR_print_errors(bio_err);
360 goto end;
361 }
362 }
363
364 /* dh != NULL */
365 }
366
367 out = BIO_new(BIO_s_file());
368 if (out == NULL) {
369 ERR_print_errors(bio_err);
370 goto end;
371 }
372 if (cfg.outfile == NULL) {
373 BIO_set_fp(out, stdout, BIO_NOCLOSE);
374 } else {
375 if (BIO_write_filename(out, cfg.outfile) <= 0) {
376 perror(cfg.outfile);
377 goto end;
378 }
379 }
380
381
382 if (cfg.text) {
383 DHparams_print(out, dh);
384 }
385 if (cfg.check) {
386 if (!DH_check(dh, &i)) {
387 ERR_print_errors(bio_err);
388 goto end;
389 }
390 if (i & DH_CHECK_P_NOT_PRIME)
391 printf("p value is not prime\n");
392 if (i & DH_CHECK_P_NOT_SAFE_PRIME)
393 printf("p value is not a safe prime\n");
394 if (i & DH_UNABLE_TO_CHECK_GENERATOR)
395 printf("unable to check the generator value\n");
396 if (i & DH_NOT_SUITABLE_GENERATOR)
397 printf("the g value is not a generator\n");
398 if (i == 0)
399 printf("DH parameters appear to be ok.\n");
400 }
401 if (!cfg.noout) {
402 if (cfg.outformat == FORMAT_ASN1)
403 i = i2d_DHparams_bio(out, dh);
404 else if (cfg.outformat == FORMAT_PEM)
405 i = PEM_write_bio_DHparams(out, dh);
406 else {
407 BIO_printf(bio_err, "bad output format specified for outfile\n");
408 goto end;
409 }
410 if (!i) {
411 BIO_printf(bio_err, "unable to write DH parameters\n");
412 ERR_print_errors(bio_err);
413 goto end;
414 }
415 }
416 ret = 0;
417
418 end:
419 BIO_free(in);
420 BIO_free_all(out);
421 BN_GENCB_free(cb);
422 DH_free(dh);
423
424 return (ret);
425}
426
427/* dh_cb is identical to dsa_cb in apps/dsaparam.c */
428static int
429dh_cb(int p, int n, BN_GENCB *cb)
430{
431 char c = '*';
432
433 if (p == 0)
434 c = '.';
435 if (p == 1)
436 c = '+';
437 if (p == 2)
438 c = '*';
439 if (p == 3)
440 c = '\n';
441 BIO_write(BN_GENCB_get_arg(cb), &c, 1);
442 (void) BIO_flush(BN_GENCB_get_arg(cb));
443 return 1;
444}
445
446#endif
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