xref: /openbsd-src/usr.bin/openssl/dsaparam.c (revision a9d90585ca40c280201dda70d6b331b26701653a)
1 /* $OpenBSD: dsaparam.c,v 1.16 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 #include <openssl/opensslconf.h>	/* for OPENSSL_NO_DSA */
60 
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 #include <limits.h>
68 #include <stdio.h>
69 #include <stdlib.h>
70 #include <string.h>
71 #include <time.h>
72 
73 #include "apps.h"
74 
75 #include <openssl/bio.h>
76 #include <openssl/bn.h>
77 #include <openssl/err.h>
78 #include <openssl/dsa.h>
79 #include <openssl/pem.h>
80 #include <openssl/x509.h>
81 
82 static struct {
83 	int genkey;
84 	char *infile;
85 	int informat;
86 	int noout;
87 	char *outfile;
88 	int outformat;
89 	int text;
90 } cfg;
91 
92 static const struct option dsaparam_options[] = {
93 	{
94 		.name = "genkey",
95 		.desc = "Generate a DSA key",
96 		.type = OPTION_FLAG,
97 		.opt.flag = &cfg.genkey,
98 	},
99 	{
100 		.name = "in",
101 		.argname = "file",
102 		.desc = "Input file (default stdin)",
103 		.type = OPTION_ARG,
104 		.opt.arg = &cfg.infile,
105 	},
106 	{
107 		.name = "inform",
108 		.argname = "format",
109 		.desc = "Input format (DER or PEM (default))",
110 		.type = OPTION_ARG_FORMAT,
111 		.opt.value = &cfg.informat,
112 	},
113 	{
114 		.name = "noout",
115 		.desc = "No output",
116 		.type = OPTION_FLAG,
117 		.opt.flag = &cfg.noout,
118 	},
119 	{
120 		.name = "out",
121 		.argname = "file",
122 		.desc = "Output file (default stdout)",
123 		.type = OPTION_ARG,
124 		.opt.arg = &cfg.outfile,
125 	},
126 	{
127 		.name = "outform",
128 		.argname = "format",
129 		.desc = "Output format (DER or PEM (default))",
130 		.type = OPTION_ARG_FORMAT,
131 		.opt.value = &cfg.outformat,
132 	},
133 	{
134 		.name = "text",
135 		.desc = "Print as text",
136 		.type = OPTION_FLAG,
137 		.opt.flag = &cfg.text,
138 	},
139 	{ NULL },
140 };
141 
142 static void
143 dsaparam_usage(void)
144 {
145 	fprintf(stderr,
146 	    "usage: dsaparam [-genkey] [-in file]\n"
147 	    "    [-inform format] [-noout] [-out file] [-outform format]\n"
148 	    "    [-text] [numbits]\n\n");
149 	options_usage(dsaparam_options);
150 }
151 
152 static int dsa_cb(int p, int n, BN_GENCB *cb);
153 
154 int
155 dsaparam_main(int argc, char **argv)
156 {
157 	DSA *dsa = NULL;
158 	int i;
159 	BIO *in = NULL, *out = NULL;
160 	BN_GENCB *cb = NULL;
161 	int ret = 1;
162 	int numbits = -1;
163 	char *strbits = NULL;
164 
165 	if (pledge("stdio cpath wpath rpath", NULL) == -1) {
166 		perror("pledge");
167 		exit(1);
168 	}
169 
170 	memset(&cfg, 0, sizeof(cfg));
171 
172 	cfg.informat = FORMAT_PEM;
173 	cfg.outformat = FORMAT_PEM;
174 
175 	if (options_parse(argc, argv, dsaparam_options, &strbits, NULL) != 0) {
176 		dsaparam_usage();
177 		goto end;
178 	}
179 
180 	if (strbits != NULL) {
181 		const char *errstr;
182 		numbits = strtonum(strbits, 0, INT_MAX, &errstr);
183 		if (errstr) {
184 			fprintf(stderr, "Invalid number of bits: %s", errstr);
185 			goto end;
186 		}
187 	}
188 
189 	in = BIO_new(BIO_s_file());
190 	out = BIO_new(BIO_s_file());
191 	if (in == NULL || out == NULL) {
192 		ERR_print_errors(bio_err);
193 		goto end;
194 	}
195 	if (cfg.infile == NULL)
196 		BIO_set_fp(in, stdin, BIO_NOCLOSE);
197 	else {
198 		if (BIO_read_filename(in, cfg.infile) <= 0) {
199 			perror(cfg.infile);
200 			goto end;
201 		}
202 	}
203 	if (cfg.outfile == NULL) {
204 		BIO_set_fp(out, stdout, BIO_NOCLOSE);
205 	} else {
206 		if (BIO_write_filename(out, cfg.outfile) <= 0) {
207 			perror(cfg.outfile);
208 			goto end;
209 		}
210 	}
211 
212 	if (numbits > 0) {
213 		if ((cb = BN_GENCB_new()) == NULL) {
214 			BIO_printf(bio_err,
215 			    "Error allocating BN_GENCB object\n");
216 			goto end;
217 		}
218 
219 		BN_GENCB_set(cb, dsa_cb, bio_err);
220 
221 		dsa = DSA_new();
222 		if (!dsa) {
223 			BIO_printf(bio_err, "Error allocating DSA object\n");
224 			goto end;
225 		}
226 		BIO_printf(bio_err, "Generating DSA parameters, %d bit long prime\n", numbits);
227 		BIO_printf(bio_err, "This could take some time\n");
228 		if (!DSA_generate_parameters_ex(dsa, numbits, NULL, 0, NULL, NULL, cb)) {
229 			ERR_print_errors(bio_err);
230 			BIO_printf(bio_err, "Error, DSA key generation failed\n");
231 			goto end;
232 		}
233 	} else if (cfg.informat == FORMAT_ASN1)
234 		dsa = d2i_DSAparams_bio(in, NULL);
235 	else if (cfg.informat == FORMAT_PEM)
236 		dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL);
237 	else {
238 		BIO_printf(bio_err, "bad input format specified\n");
239 		goto end;
240 	}
241 	if (dsa == NULL) {
242 		BIO_printf(bio_err, "unable to load DSA parameters\n");
243 		ERR_print_errors(bio_err);
244 		goto end;
245 	}
246 	if (cfg.text) {
247 		DSAparams_print(out, dsa);
248 	}
249 	if (!cfg.noout) {
250 		if (cfg.outformat == FORMAT_ASN1)
251 			i = i2d_DSAparams_bio(out, dsa);
252 		else if (cfg.outformat == FORMAT_PEM)
253 			i = PEM_write_bio_DSAparams(out, dsa);
254 		else {
255 			BIO_printf(bio_err, "bad output format specified for outfile\n");
256 			goto end;
257 		}
258 		if (!i) {
259 			BIO_printf(bio_err, "unable to write DSA parameters\n");
260 			ERR_print_errors(bio_err);
261 			goto end;
262 		}
263 	}
264 	if (cfg.genkey) {
265 		DSA *dsakey;
266 
267 		if ((dsakey = DSAparams_dup(dsa)) == NULL)
268 			goto end;
269 		if (!DSA_generate_key(dsakey)) {
270 			ERR_print_errors(bio_err);
271 			DSA_free(dsakey);
272 			goto end;
273 		}
274 		if (cfg.outformat == FORMAT_ASN1)
275 			i = i2d_DSAPrivateKey_bio(out, dsakey);
276 		else if (cfg.outformat == FORMAT_PEM)
277 			i = PEM_write_bio_DSAPrivateKey(out, dsakey, NULL, NULL, 0, NULL, NULL);
278 		else {
279 			BIO_printf(bio_err, "bad output format specified for outfile\n");
280 			DSA_free(dsakey);
281 			goto end;
282 		}
283 		DSA_free(dsakey);
284 	}
285 	ret = 0;
286 
287  end:
288 	BIO_free(in);
289 	BIO_free_all(out);
290 	BN_GENCB_free(cb);
291 	DSA_free(dsa);
292 
293 	return (ret);
294 }
295 
296 static int
297 dsa_cb(int p, int n, BN_GENCB *cb)
298 {
299 	char c = '*';
300 
301 	if (p == 0)
302 		c = '.';
303 	if (p == 1)
304 		c = '+';
305 	if (p == 2)
306 		c = '*';
307 	if (p == 3)
308 		c = '\n';
309 	BIO_write(BN_GENCB_get_arg(cb), &c, 1);
310 	(void) BIO_flush(BN_GENCB_get_arg(cb));
311 #ifdef GENCB_TEST
312 	if (stop_keygen_flag)
313 		return 0;
314 #endif
315 	return 1;
316 }
317