1 /* $OpenBSD: dsaparam.c,v 1.13 2022/01/14 09:24:20 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 C;
84 	int genkey;
85 	char *infile;
86 	int informat;
87 	int noout;
88 	char *outfile;
89 	int outformat;
90 	int text;
91 } dsaparam_config;
92 
93 static const struct option dsaparam_options[] = {
94 	{
95 		.name = "C",
96 		.desc = "Convert DSA parameters into C code",
97 		.type = OPTION_FLAG,
98 		.opt.flag = &dsaparam_config.C,
99 	},
100 	{
101 		.name = "genkey",
102 		.desc = "Generate a DSA key",
103 		.type = OPTION_FLAG,
104 		.opt.flag = &dsaparam_config.genkey,
105 	},
106 	{
107 		.name = "in",
108 		.argname = "file",
109 		.desc = "Input file (default stdin)",
110 		.type = OPTION_ARG,
111 		.opt.arg = &dsaparam_config.infile,
112 	},
113 	{
114 		.name = "inform",
115 		.argname = "format",
116 		.desc = "Input format (DER or PEM (default))",
117 		.type = OPTION_ARG_FORMAT,
118 		.opt.value = &dsaparam_config.informat,
119 	},
120 	{
121 		.name = "noout",
122 		.desc = "No output",
123 		.type = OPTION_FLAG,
124 		.opt.flag = &dsaparam_config.noout,
125 	},
126 	{
127 		.name = "out",
128 		.argname = "file",
129 		.desc = "Output file (default stdout)",
130 		.type = OPTION_ARG,
131 		.opt.arg = &dsaparam_config.outfile,
132 	},
133 	{
134 		.name = "outform",
135 		.argname = "format",
136 		.desc = "Output format (DER or PEM (default))",
137 		.type = OPTION_ARG_FORMAT,
138 		.opt.value = &dsaparam_config.outformat,
139 	},
140 	{
141 		.name = "text",
142 		.desc = "Print as text",
143 		.type = OPTION_FLAG,
144 		.opt.flag = &dsaparam_config.text,
145 	},
146 	{ NULL },
147 };
148 
149 static void
150 dsaparam_usage(void)
151 {
152 	fprintf(stderr,
153 	    "usage: dsaparam [-C] [-genkey] [-in file]\n"
154 	    "    [-inform format] [-noout] [-out file] [-outform format]\n"
155 	    "    [-text] [numbits]\n\n");
156 	options_usage(dsaparam_options);
157 }
158 
159 static int dsa_cb(int p, int n, BN_GENCB *cb);
160 
161 int
162 dsaparam_main(int argc, char **argv)
163 {
164 	DSA *dsa = NULL;
165 	int i;
166 	BIO *in = NULL, *out = NULL;
167 	BN_GENCB *cb = NULL;
168 	int ret = 1;
169 	int numbits = -1;
170 	char *strbits = NULL;
171 
172 	if (single_execution) {
173 		if (pledge("stdio cpath wpath rpath", NULL) == -1) {
174 			perror("pledge");
175 			exit(1);
176 		}
177 	}
178 
179 	memset(&dsaparam_config, 0, sizeof(dsaparam_config));
180 
181 	dsaparam_config.informat = FORMAT_PEM;
182 	dsaparam_config.outformat = FORMAT_PEM;
183 
184 	if (options_parse(argc, argv, dsaparam_options, &strbits, NULL) != 0) {
185 		dsaparam_usage();
186 		goto end;
187 	}
188 
189 	if (strbits != NULL) {
190 		const char *errstr;
191 		numbits = strtonum(strbits, 0, INT_MAX, &errstr);
192 		if (errstr) {
193 			fprintf(stderr, "Invalid number of bits: %s", errstr);
194 			goto end;
195 		}
196 	}
197 
198 	in = BIO_new(BIO_s_file());
199 	out = BIO_new(BIO_s_file());
200 	if (in == NULL || out == NULL) {
201 		ERR_print_errors(bio_err);
202 		goto end;
203 	}
204 	if (dsaparam_config.infile == NULL)
205 		BIO_set_fp(in, stdin, BIO_NOCLOSE);
206 	else {
207 		if (BIO_read_filename(in, dsaparam_config.infile) <= 0) {
208 			perror(dsaparam_config.infile);
209 			goto end;
210 		}
211 	}
212 	if (dsaparam_config.outfile == NULL) {
213 		BIO_set_fp(out, stdout, BIO_NOCLOSE);
214 	} else {
215 		if (BIO_write_filename(out, dsaparam_config.outfile) <= 0) {
216 			perror(dsaparam_config.outfile);
217 			goto end;
218 		}
219 	}
220 
221 	if (numbits > 0) {
222 		if ((cb = BN_GENCB_new()) == NULL) {
223 			BIO_printf(bio_err,
224 			    "Error allocating BN_GENCB object\n");
225 			goto end;
226 		}
227 
228 		BN_GENCB_set(cb, dsa_cb, bio_err);
229 
230 		dsa = DSA_new();
231 		if (!dsa) {
232 			BIO_printf(bio_err, "Error allocating DSA object\n");
233 			goto end;
234 		}
235 		BIO_printf(bio_err, "Generating DSA parameters, %d bit long prime\n", numbits);
236 		BIO_printf(bio_err, "This could take some time\n");
237 		if (!DSA_generate_parameters_ex(dsa, numbits, NULL, 0, NULL, NULL, cb)) {
238 			ERR_print_errors(bio_err);
239 			BIO_printf(bio_err, "Error, DSA key generation failed\n");
240 			goto end;
241 		}
242 	} else if (dsaparam_config.informat == FORMAT_ASN1)
243 		dsa = d2i_DSAparams_bio(in, NULL);
244 	else if (dsaparam_config.informat == FORMAT_PEM)
245 		dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL);
246 	else {
247 		BIO_printf(bio_err, "bad input format specified\n");
248 		goto end;
249 	}
250 	if (dsa == NULL) {
251 		BIO_printf(bio_err, "unable to load DSA parameters\n");
252 		ERR_print_errors(bio_err);
253 		goto end;
254 	}
255 	if (dsaparam_config.text) {
256 		DSAparams_print(out, dsa);
257 	}
258 	if (dsaparam_config.C) {
259 		unsigned char *data;
260 		int l, len, bits_p;
261 
262 		len = BN_num_bytes(DSA_get0_p(dsa));
263 		bits_p = BN_num_bits(DSA_get0_p(dsa));
264 		data = malloc(len + 20);
265 		if (data == NULL) {
266 			perror("malloc");
267 			goto end;
268 		}
269 		l = BN_bn2bin(DSA_get0_p(dsa), data);
270 		printf("static unsigned char dsa%d_p[] = {", bits_p);
271 		for (i = 0; i < l; i++) {
272 			if ((i % 12) == 0)
273 				printf("\n\t");
274 			printf("0x%02X, ", data[i]);
275 		}
276 		printf("\n\t};\n");
277 
278 		l = BN_bn2bin(DSA_get0_q(dsa), data);
279 		printf("static unsigned char dsa%d_q[] = {", bits_p);
280 		for (i = 0; i < l; i++) {
281 			if ((i % 12) == 0)
282 				printf("\n\t");
283 			printf("0x%02X, ", data[i]);
284 		}
285 		printf("\n\t};\n");
286 
287 		l = BN_bn2bin(DSA_get0_g(dsa), data);
288 		printf("static unsigned char dsa%d_g[] = {", bits_p);
289 		for (i = 0; i < l; i++) {
290 			if ((i % 12) == 0)
291 				printf("\n\t");
292 			printf("0x%02X, ", data[i]);
293 		}
294 		free(data);
295 		printf("\n\t};\n\n");
296 
297 		printf("DSA *get_dsa%d()\n\t{\n", bits_p);
298 		printf("\tBIGNUM *p = NULL, *q = NULL, *g = NULL;\n");
299 		printf("\tDSA *dsa;\n\n");
300 		printf("\tif ((dsa = DSA_new()) == NULL) return(NULL);\n");
301 		printf("\tp = BN_bin2bn(dsa%d_p, sizeof(dsa%d_p), NULL);\n",
302 		    bits_p, bits_p);
303 		printf("\tq = BN_bin2bn(dsa%d_q, sizeof(dsa%d_q), NULL);\n",
304 		    bits_p, bits_p);
305 		printf("\tg = BN_bin2bn(dsa%d_g, sizeof(dsa%d_g), NULL);\n",
306 		    bits_p, bits_p);
307 		printf("\tif (p == NULL || q == NULL || g == NULL)\n");
308 		printf("\t\t{ BN_free(p); BN_free(q); BN_free(g); DSA_free(dsa); return(NULL); }\n");
309 		printf("\tDSA_set0_pqg(dsa, p, q, g);\n");
310 		printf("\treturn(dsa);\n\t}\n");
311 	}
312 	if (!dsaparam_config.noout) {
313 		if (dsaparam_config.outformat == FORMAT_ASN1)
314 			i = i2d_DSAparams_bio(out, dsa);
315 		else if (dsaparam_config.outformat == FORMAT_PEM)
316 			i = PEM_write_bio_DSAparams(out, dsa);
317 		else {
318 			BIO_printf(bio_err, "bad output format specified for outfile\n");
319 			goto end;
320 		}
321 		if (!i) {
322 			BIO_printf(bio_err, "unable to write DSA parameters\n");
323 			ERR_print_errors(bio_err);
324 			goto end;
325 		}
326 	}
327 	if (dsaparam_config.genkey) {
328 		DSA *dsakey;
329 
330 		if ((dsakey = DSAparams_dup(dsa)) == NULL)
331 			goto end;
332 		if (!DSA_generate_key(dsakey)) {
333 			ERR_print_errors(bio_err);
334 			DSA_free(dsakey);
335 			goto end;
336 		}
337 		if (dsaparam_config.outformat == FORMAT_ASN1)
338 			i = i2d_DSAPrivateKey_bio(out, dsakey);
339 		else if (dsaparam_config.outformat == FORMAT_PEM)
340 			i = PEM_write_bio_DSAPrivateKey(out, dsakey, NULL, NULL, 0, NULL, NULL);
341 		else {
342 			BIO_printf(bio_err, "bad output format specified for outfile\n");
343 			DSA_free(dsakey);
344 			goto end;
345 		}
346 		DSA_free(dsakey);
347 	}
348 	ret = 0;
349 
350  end:
351 	BIO_free(in);
352 	BIO_free_all(out);
353 	BN_GENCB_free(cb);
354 	DSA_free(dsa);
355 
356 	return (ret);
357 }
358 
359 static int
360 dsa_cb(int p, int n, BN_GENCB *cb)
361 {
362 	char c = '*';
363 
364 	if (p == 0)
365 		c = '.';
366 	if (p == 1)
367 		c = '+';
368 	if (p == 2)
369 		c = '*';
370 	if (p == 3)
371 		c = '\n';
372 	BIO_write(BN_GENCB_get_arg(cb), &c, 1);
373 	(void) BIO_flush(BN_GENCB_get_arg(cb));
374 #ifdef GENCB_TEST
375 	if (stop_keygen_flag)
376 		return 0;
377 #endif
378 	return 1;
379 }
380