1 /* $OpenBSD: dh.c,v 1.13 2022/01/14 09:21:54 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_DH */
60
61 #ifndef OPENSSL_NO_DH
62
63 #include <stdio.h>
64 #include <stdlib.h>
65 #include <string.h>
66 #include <time.h>
67
68 #include "apps.h"
69
70 #include <openssl/bio.h>
71 #include <openssl/bn.h>
72 #include <openssl/err.h>
73 #include <openssl/dh.h>
74 #include <openssl/pem.h>
75 #include <openssl/x509.h>
76
77 static struct {
78 int C;
79 int check;
80 char *infile;
81 int informat;
82 int noout;
83 char *outfile;
84 int outformat;
85 int text;
86 } dh_config;
87
88 static const struct option dh_options[] = {
89 {
90 .name = "C",
91 .desc = "Convert DH parameters into C code",
92 .type = OPTION_FLAG,
93 .opt.flag = &dh_config.C,
94 },
95 {
96 .name = "check",
97 .desc = "Check the DH parameters",
98 .type = OPTION_FLAG,
99 .opt.flag = &dh_config.check,
100 },
101 {
102 .name = "in",
103 .argname = "file",
104 .desc = "Input file (default stdin)",
105 .type = OPTION_ARG,
106 .opt.arg = &dh_config.infile,
107 },
108 {
109 .name = "inform",
110 .argname = "format",
111 .desc = "Input format (DER or PEM (default))",
112 .type = OPTION_ARG_FORMAT,
113 .opt.value = &dh_config.informat,
114 },
115 {
116 .name = "noout",
117 .desc = "No output",
118 .type = OPTION_FLAG,
119 .opt.flag = &dh_config.noout,
120 },
121 {
122 .name = "out",
123 .argname = "file",
124 .desc = "Output file (default stdout)",
125 .type = OPTION_ARG,
126 .opt.arg = &dh_config.outfile,
127 },
128 {
129 .name = "outform",
130 .argname = "format",
131 .desc = "Output format (DER or PEM (default))",
132 .type = OPTION_ARG_FORMAT,
133 .opt.value = &dh_config.outformat,
134 },
135 {
136 .name = "text",
137 .desc = "Print a text form of the DH parameters",
138 .type = OPTION_FLAG,
139 .opt.flag = &dh_config.text,
140 },
141 { NULL },
142 };
143
144 static void
dh_usage(void)145 dh_usage(void)
146 {
147 fprintf(stderr,
148 "usage: dh [-C] [-check] [-in file] [-inform format]\n"
149 " [-noout] [-out file] [-outform format] [-text]\n\n");
150 options_usage(dh_options);
151 }
152
153 int
dh_main(int argc,char ** argv)154 dh_main(int argc, char **argv)
155 {
156 DH *dh = NULL;
157 int i;
158 BIO *in = NULL, *out = NULL;
159 int ret = 1;
160
161 if (single_execution) {
162 if (pledge("stdio cpath wpath rpath", NULL) == -1) {
163 perror("pledge");
164 exit(1);
165 }
166 }
167
168 memset(&dh_config, 0, sizeof(dh_config));
169
170 dh_config.informat = FORMAT_PEM;
171 dh_config.outformat = FORMAT_PEM;
172
173 if (options_parse(argc, argv, dh_options, NULL, NULL) != 0) {
174 dh_usage();
175 goto end;
176 }
177
178 in = BIO_new(BIO_s_file());
179 out = BIO_new(BIO_s_file());
180 if (in == NULL || out == NULL) {
181 ERR_print_errors(bio_err);
182 goto end;
183 }
184 if (dh_config.infile == NULL)
185 BIO_set_fp(in, stdin, BIO_NOCLOSE);
186 else {
187 if (BIO_read_filename(in, dh_config.infile) <= 0) {
188 perror(dh_config.infile);
189 goto end;
190 }
191 }
192 if (dh_config.outfile == NULL) {
193 BIO_set_fp(out, stdout, BIO_NOCLOSE);
194 } else {
195 if (BIO_write_filename(out, dh_config.outfile) <= 0) {
196 perror(dh_config.outfile);
197 goto end;
198 }
199 }
200
201 if (dh_config.informat == FORMAT_ASN1)
202 dh = d2i_DHparams_bio(in, NULL);
203 else if (dh_config.informat == FORMAT_PEM)
204 dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
205 else {
206 BIO_printf(bio_err, "bad input format specified\n");
207 goto end;
208 }
209 if (dh == NULL) {
210 BIO_printf(bio_err, "unable to load DH parameters\n");
211 ERR_print_errors(bio_err);
212 goto end;
213 }
214 if (dh_config.text) {
215 DHparams_print(out, dh);
216 }
217 if (dh_config.check) {
218 if (!DH_check(dh, &i)) {
219 ERR_print_errors(bio_err);
220 goto end;
221 }
222 if (i & DH_CHECK_P_NOT_PRIME)
223 printf("p value is not prime\n");
224 if (i & DH_CHECK_P_NOT_SAFE_PRIME)
225 printf("p value is not a safe prime\n");
226 if (i & DH_UNABLE_TO_CHECK_GENERATOR)
227 printf("unable to check the generator value\n");
228 if (i & DH_NOT_SUITABLE_GENERATOR)
229 printf("the g value is not a generator\n");
230 if (i == 0)
231 printf("DH parameters appear to be ok.\n");
232 }
233 if (dh_config.C) {
234 unsigned char *data;
235 int len, l, bits;
236
237 len = BN_num_bytes(DH_get0_p(dh));
238 bits = BN_num_bits(DH_get0_p(dh));
239 data = malloc(len);
240 if (data == NULL) {
241 perror("malloc");
242 goto end;
243 }
244 l = BN_bn2bin(DH_get0_p(dh), data);
245 printf("static unsigned char dh%d_p[] = {", bits);
246 for (i = 0; i < l; i++) {
247 if ((i % 12) == 0)
248 printf("\n\t");
249 printf("0x%02X, ", data[i]);
250 }
251 printf("\n\t};\n");
252
253 l = BN_bn2bin(DH_get0_g(dh), data);
254 printf("static unsigned char dh%d_g[] = {", bits);
255 for (i = 0; i < l; i++) {
256 if ((i % 12) == 0)
257 printf("\n\t");
258 printf("0x%02X, ", data[i]);
259 }
260 printf("\n\t};\n\n");
261
262 printf("DH *get_dh%d()\n\t{\n", bits);
263 printf("\tDH *dh;\n");
264 printf("\tBIGNUM *p = NULL, *g = NULL;\n\n");
265 printf("\tif ((dh = DH_new()) == NULL) return(NULL);\n");
266 printf("\tp = BN_bin2bn(dh%d_p, sizeof(dh%d_p), NULL);\n",
267 bits, bits);
268 printf("\tg = BN_bin2bn(dh%d_g, sizeof(dh%d_g), NULL);\n",
269 bits, bits);
270 printf("\tif (p == NULL || g == NULL)\n");
271 printf("\t\t{ BN_free(p); BN_free(q); DH_free(dh); return(NULL); }\n");
272 printf("\tDH_set0_pqg(dh, p, NULL, g);\n");
273 printf("\treturn(dh);\n\t}\n");
274 free(data);
275 }
276 if (!dh_config.noout) {
277 if (dh_config.outformat == FORMAT_ASN1)
278 i = i2d_DHparams_bio(out, dh);
279 else if (dh_config.outformat == FORMAT_PEM)
280 i = PEM_write_bio_DHparams(out, dh);
281 else {
282 BIO_printf(bio_err, "bad output format specified for outfile\n");
283 goto end;
284 }
285 if (!i) {
286 BIO_printf(bio_err, "unable to write DH parameters\n");
287 ERR_print_errors(bio_err);
288 goto end;
289 }
290 }
291 ret = 0;
292
293 end:
294 BIO_free(in);
295 BIO_free_all(out);
296 DH_free(dh);
297
298 return (ret);
299 }
300 #endif
301