Annotation of src/usr.bin/openssl/dhparam.c, Revision 1.18
1.18 ! tb 1: /* $OpenBSD: dhparam.c,v 1.17 2023/03/06 14:32:06 tb Exp $ */
1.1 jsing 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:
1.3 sthen 132: #define DEFBITS 2048
1.1 jsing 133:
1.16 tb 134: static struct {
1.4 jsing 135: int C;
136: int check;
137: int dsaparam;
138: int g;
139: char *infile;
140: int informat;
141: int noout;
142: char *outfile;
143: int outformat;
144: int text;
1.17 tb 145: } cfg;
1.4 jsing 146:
1.12 guenther 147: static const struct option dhparam_options[] = {
1.4 jsing 148: {
149: .name = "2",
150: .desc = "Generate DH parameters with a generator value of 2 "
151: "(default)",
152: .type = OPTION_VALUE,
1.17 tb 153: .opt.value = &cfg.g,
1.4 jsing 154: .value = 2,
155: },
156: {
157: .name = "5",
158: .desc = "Generate DH parameters with a generator value of 5",
159: .type = OPTION_VALUE,
1.17 tb 160: .opt.value = &cfg.g,
1.4 jsing 161: .value = 5,
162: },
163: {
164: .name = "C",
165: .desc = "Convert DH parameters into C code",
166: .type = OPTION_FLAG,
1.17 tb 167: .opt.flag = &cfg.C,
1.4 jsing 168: },
169: {
170: .name = "check",
171: .desc = "Check the DH parameters",
172: .type = OPTION_FLAG,
1.17 tb 173: .opt.flag = &cfg.check,
1.4 jsing 174: },
175: {
176: .name = "dsaparam",
177: .desc = "Read or generate DSA parameters and convert to DH",
178: .type = OPTION_FLAG,
1.17 tb 179: .opt.flag = &cfg.dsaparam,
1.4 jsing 180: },
181: {
182: .name = "in",
183: .argname = "file",
184: .desc = "Input file (default stdin)",
185: .type = OPTION_ARG,
1.17 tb 186: .opt.arg = &cfg.infile,
1.4 jsing 187: },
188: {
189: .name = "inform",
190: .argname = "format",
191: .desc = "Input format (DER or PEM (default))",
192: .type = OPTION_ARG_FORMAT,
1.17 tb 193: .opt.value = &cfg.informat,
1.4 jsing 194: },
195: {
196: .name = "noout",
197: .desc = "Do not output encoded version of DH parameters",
198: .type = OPTION_FLAG,
1.17 tb 199: .opt.flag = &cfg.noout,
1.4 jsing 200: },
201: {
202: .name = "out",
203: .argname = "file",
204: .desc = "Output file (default stdout)",
205: .type = OPTION_ARG,
1.17 tb 206: .opt.arg = &cfg.outfile,
1.4 jsing 207: },
208: {
209: .name = "outform",
210: .argname = "format",
211: .desc = "Output format (DER or PEM (default))",
212: .type = OPTION_ARG_FORMAT,
1.17 tb 213: .opt.value = &cfg.outformat,
1.4 jsing 214: },
215: {
216: .name = "text",
217: .desc = "Print DH parameters in plain text",
218: .type = OPTION_FLAG,
1.17 tb 219: .opt.flag = &cfg.text,
1.4 jsing 220: },
221: { NULL },
222: };
223:
224: static void
1.18 ! tb 225: dhparam_usage(void)
1.4 jsing 226: {
227: fprintf(stderr,
1.6 bcook 228: "usage: dhparam [-2 | -5] [-C] [-check] [-dsaparam]\n"
1.4 jsing 229: " [-in file] [-inform DER | PEM] [-noout] [-out file]\n"
230: " [-outform DER | PEM] [-text] [numbits]\n\n");
231: options_usage(dhparam_options);
232: }
1.1 jsing 233:
1.13 tb 234: static int dh_cb(int p, int n, BN_GENCB *cb);
1.1 jsing 235:
236: int
237: dhparam_main(int argc, char **argv)
238: {
1.4 jsing 239: BIO *in = NULL, *out = NULL;
1.13 tb 240: BN_GENCB *cb = NULL;
1.4 jsing 241: char *num_bits = NULL;
1.1 jsing 242: DH *dh = NULL;
1.4 jsing 243: int num = 0;
244: int ret = 1;
245: int i;
1.7 doug 246:
1.15 joshua 247: if (pledge("stdio cpath wpath rpath", NULL) == -1) {
248: perror("pledge");
249: exit(1);
1.7 doug 250: }
1.4 jsing 251:
1.17 tb 252: memset(&cfg, 0, sizeof(cfg));
1.4 jsing 253:
1.17 tb 254: cfg.informat = FORMAT_PEM;
255: cfg.outformat = FORMAT_PEM;
1.4 jsing 256:
257: if (options_parse(argc, argv, dhparam_options, &num_bits, NULL) != 0) {
258: dhparam_usage();
259: return (1);
260: }
1.1 jsing 261:
1.4 jsing 262: if (num_bits != NULL) {
263: if(sscanf(num_bits, "%d", &num) == 0 || num <= 0) {
264: BIO_printf(bio_err, "invalid number of bits: %s\n",
265: num_bits);
266: return (1);
1.1 jsing 267: }
268: }
269:
1.17 tb 270: if (cfg.g && !num)
1.1 jsing 271: num = DEFBITS;
272:
1.17 tb 273: if (cfg.dsaparam) {
274: if (cfg.g) {
1.1 jsing 275: BIO_printf(bio_err, "generator may not be chosen for DSA parameters\n");
276: goto end;
277: }
1.4 jsing 278: } else {
1.1 jsing 279: /* DH parameters */
1.17 tb 280: if (num && !cfg.g)
281: cfg.g = 2;
1.1 jsing 282: }
283:
284: if (num) {
1.13 tb 285: if ((cb = BN_GENCB_new()) == NULL) {
286: BIO_printf(bio_err,
287: "Error allocating BN_GENCB object\n");
288: goto end;
289: }
1.1 jsing 290:
1.13 tb 291: BN_GENCB_set(cb, dh_cb, bio_err);
1.17 tb 292: if (cfg.dsaparam) {
1.1 jsing 293: DSA *dsa = DSA_new();
294:
295: BIO_printf(bio_err, "Generating DSA parameters, %d bit long prime\n", num);
296: if (!dsa || !DSA_generate_parameters_ex(dsa, num,
1.13 tb 297: NULL, 0, NULL, NULL, cb)) {
1.10 jsing 298: DSA_free(dsa);
1.1 jsing 299: ERR_print_errors(bio_err);
300: goto end;
301: }
302: dh = DSA_dup_DH(dsa);
303: DSA_free(dsa);
304: if (dh == NULL) {
305: ERR_print_errors(bio_err);
306: goto end;
307: }
1.4 jsing 308: } else {
1.1 jsing 309: dh = DH_new();
1.17 tb 310: BIO_printf(bio_err, "Generating DH parameters, %d bit long safe prime, generator %d\n", num, cfg.g);
1.1 jsing 311: BIO_printf(bio_err, "This is going to take a long time\n");
1.17 tb 312: if (!dh || !DH_generate_parameters_ex(dh, num, cfg.g, cb)) {
1.1 jsing 313: ERR_print_errors(bio_err);
314: goto end;
315: }
316: }
317: } else {
318:
319: in = BIO_new(BIO_s_file());
320: if (in == NULL) {
321: ERR_print_errors(bio_err);
322: goto end;
323: }
1.17 tb 324: if (cfg.infile == NULL)
1.1 jsing 325: BIO_set_fp(in, stdin, BIO_NOCLOSE);
326: else {
1.17 tb 327: if (BIO_read_filename(in, cfg.infile) <= 0) {
328: perror(cfg.infile);
1.1 jsing 329: goto end;
330: }
331: }
332:
1.17 tb 333: if (cfg.informat != FORMAT_ASN1 &&
334: cfg.informat != FORMAT_PEM) {
1.1 jsing 335: BIO_printf(bio_err, "bad input format specified\n");
336: goto end;
337: }
1.17 tb 338: if (cfg.dsaparam) {
1.1 jsing 339: DSA *dsa;
340:
1.17 tb 341: if (cfg.informat == FORMAT_ASN1)
1.1 jsing 342: dsa = d2i_DSAparams_bio(in, NULL);
343: else /* informat == FORMAT_PEM */
344: dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL);
345:
346: if (dsa == NULL) {
347: BIO_printf(bio_err, "unable to load DSA parameters\n");
348: ERR_print_errors(bio_err);
349: goto end;
350: }
351: dh = DSA_dup_DH(dsa);
352: DSA_free(dsa);
353: if (dh == NULL) {
354: ERR_print_errors(bio_err);
355: goto end;
356: }
357: } else
358: {
1.17 tb 359: if (cfg.informat == FORMAT_ASN1)
1.1 jsing 360: dh = d2i_DHparams_bio(in, NULL);
361: else /* informat == FORMAT_PEM */
362: dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
363:
364: if (dh == NULL) {
365: BIO_printf(bio_err, "unable to load DH parameters\n");
366: ERR_print_errors(bio_err);
367: goto end;
368: }
369: }
370:
371: /* dh != NULL */
372: }
373:
374: out = BIO_new(BIO_s_file());
375: if (out == NULL) {
376: ERR_print_errors(bio_err);
377: goto end;
378: }
1.17 tb 379: if (cfg.outfile == NULL) {
1.1 jsing 380: BIO_set_fp(out, stdout, BIO_NOCLOSE);
381: } else {
1.17 tb 382: if (BIO_write_filename(out, cfg.outfile) <= 0) {
383: perror(cfg.outfile);
1.1 jsing 384: goto end;
385: }
386: }
387:
388:
1.17 tb 389: if (cfg.text) {
1.1 jsing 390: DHparams_print(out, dh);
391: }
1.17 tb 392: if (cfg.check) {
1.1 jsing 393: if (!DH_check(dh, &i)) {
394: ERR_print_errors(bio_err);
395: goto end;
396: }
397: if (i & DH_CHECK_P_NOT_PRIME)
398: printf("p value is not prime\n");
399: if (i & DH_CHECK_P_NOT_SAFE_PRIME)
400: printf("p value is not a safe prime\n");
401: if (i & DH_UNABLE_TO_CHECK_GENERATOR)
402: printf("unable to check the generator value\n");
403: if (i & DH_NOT_SUITABLE_GENERATOR)
404: printf("the g value is not a generator\n");
405: if (i == 0)
406: printf("DH parameters appear to be ok.\n");
407: }
1.17 tb 408: if (cfg.C) {
1.1 jsing 409: unsigned char *data;
410: int len, l, bits;
411:
1.14 tb 412: len = BN_num_bytes(DH_get0_p(dh));
413: bits = BN_num_bits(DH_get0_p(dh));
1.1 jsing 414: data = malloc(len);
415: if (data == NULL) {
416: perror("malloc");
417: goto end;
418: }
419: printf("#ifndef HEADER_DH_H\n"
420: "#include <openssl/dh.h>\n"
421: "#endif\n");
422: printf("DH *get_dh%d()\n\t{\n", bits);
423:
1.14 tb 424: l = BN_bn2bin(DH_get0_p(dh), data);
1.1 jsing 425: printf("\tstatic unsigned char dh%d_p[] = {", bits);
426: for (i = 0; i < l; i++) {
427: if ((i % 12) == 0)
428: printf("\n\t\t");
429: printf("0x%02X, ", data[i]);
430: }
431: printf("\n\t\t};\n");
432:
1.14 tb 433: l = BN_bn2bin(DH_get0_g(dh), data);
1.1 jsing 434: printf("\tstatic unsigned char dh%d_g[] = {", bits);
435: for (i = 0; i < l; i++) {
436: if ((i % 12) == 0)
437: printf("\n\t\t");
438: printf("0x%02X, ", data[i]);
439: }
440: printf("\n\t\t};\n");
441:
1.14 tb 442: printf("\tDH *dh;\n");
443: printf("\tBIGNUM *p = NULL, *g = NULL;\n\n");
1.1 jsing 444: printf("\tif ((dh = DH_new()) == NULL) return(NULL);\n");
1.14 tb 445: printf("\tp = BN_bin2bn(dh%d_p, sizeof(dh%d_p), NULL);\n",
1.1 jsing 446: bits, bits);
1.14 tb 447: printf("\tg = BN_bin2bn(dh%d_g, sizeof(dh%d_g), NULL);\n",
1.1 jsing 448: bits, bits);
1.14 tb 449: printf("\tif (p == NULL || g == NULL)\n");
450: printf("\t\t{ BN_free(p); BN_free(g); DH_free(dh); return(NULL); }\n");
451: printf("\tDH_set0_pqg(dh, p, NULL, g);\n");
452: if (DH_get_length(dh) > 0)
453: printf("\tDH_set_length(dh, %ld);\n", DH_get_length(dh));
1.1 jsing 454: printf("\treturn(dh);\n\t}\n");
455: free(data);
456: }
1.17 tb 457: if (!cfg.noout) {
458: if (cfg.outformat == FORMAT_ASN1)
1.1 jsing 459: i = i2d_DHparams_bio(out, dh);
1.17 tb 460: else if (cfg.outformat == FORMAT_PEM)
1.1 jsing 461: i = PEM_write_bio_DHparams(out, dh);
462: else {
463: BIO_printf(bio_err, "bad output format specified for outfile\n");
464: goto end;
465: }
466: if (!i) {
467: BIO_printf(bio_err, "unable to write DH parameters\n");
468: ERR_print_errors(bio_err);
469: goto end;
470: }
471: }
472: ret = 0;
473:
1.11 jsing 474: end:
1.1 jsing 475: BIO_free(in);
1.10 jsing 476: BIO_free_all(out);
1.13 tb 477: BN_GENCB_free(cb);
1.10 jsing 478: DH_free(dh);
1.1 jsing 479:
480: return (ret);
481: }
482:
483: /* dh_cb is identical to dsa_cb in apps/dsaparam.c */
484: static int
1.13 tb 485: dh_cb(int p, int n, BN_GENCB *cb)
1.1 jsing 486: {
487: char c = '*';
488:
489: if (p == 0)
490: c = '.';
491: if (p == 1)
492: c = '+';
493: if (p == 2)
494: c = '*';
495: if (p == 3)
496: c = '\n';
1.13 tb 497: BIO_write(BN_GENCB_get_arg(cb), &c, 1);
498: (void) BIO_flush(BN_GENCB_get_arg(cb));
1.1 jsing 499: return 1;
500: }
501:
502: #endif
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