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
dsaparam_usage(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
dsaparam_main(int argc,char ** argv)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
dsa_cb(int p,int n,BN_GENCB * cb)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