Annotation of src/usr.bin/openssl/dhparam.c, Revision 1.5
1.5 ! jsing 1: /* $OpenBSD: dhparam.c,v 1.4 2015/07/11 15:04:56 jsing 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:
1.4 jsing 134: struct {
135: int C;
136: int check;
137: int dsaparam;
138: #ifndef OPENSSL_NO_ENGINE
139: char *engine;
140: #endif
141: int g;
142: char *infile;
143: int informat;
144: int noout;
145: char *outfile;
146: int outformat;
147: int text;
148: } dhparam_config;
149:
150: struct option dhparam_options[] = {
151: {
152: .name = "2",
153: .desc = "Generate DH parameters with a generator value of 2 "
154: "(default)",
155: .type = OPTION_VALUE,
156: .opt.value = &dhparam_config.g,
157: .value = 2,
158: },
159: {
160: .name = "5",
161: .desc = "Generate DH parameters with a generator value of 5",
162: .type = OPTION_VALUE,
163: .opt.value = &dhparam_config.g,
164: .value = 5,
165: },
166: {
167: .name = "C",
168: .desc = "Convert DH parameters into C code",
169: .type = OPTION_FLAG,
170: .opt.flag = &dhparam_config.C,
171: },
172: {
173: .name = "check",
174: .desc = "Check the DH parameters",
175: .type = OPTION_FLAG,
176: .opt.flag = &dhparam_config.check,
177: },
178: {
179: .name = "dsaparam",
180: .desc = "Read or generate DSA parameters and convert to DH",
181: .type = OPTION_FLAG,
182: .opt.flag = &dhparam_config.dsaparam,
183: },
184: #ifndef OPENSSL_NO_ENGINE
185: {
186: .name = "engine",
187: .argname = "id",
188: .desc = "Use the engine specified by the given identifier",
189: .type = OPTION_ARG,
190: .opt.arg = &dhparam_config.engine,
191: },
192: #endif
193: {
194: .name = "in",
195: .argname = "file",
196: .desc = "Input file (default stdin)",
197: .type = OPTION_ARG,
198: .opt.arg = &dhparam_config.infile,
199: },
200: {
201: .name = "inform",
202: .argname = "format",
203: .desc = "Input format (DER or PEM (default))",
204: .type = OPTION_ARG_FORMAT,
205: .opt.value = &dhparam_config.informat,
206: },
207: {
208: .name = "noout",
209: .desc = "Do not output encoded version of DH parameters",
210: .type = OPTION_FLAG,
211: .opt.flag = &dhparam_config.noout,
212: },
213: {
214: .name = "out",
215: .argname = "file",
216: .desc = "Output file (default stdout)",
217: .type = OPTION_ARG,
218: .opt.arg = &dhparam_config.outfile,
219: },
220: {
221: .name = "outform",
222: .argname = "format",
223: .desc = "Output format (DER or PEM (default))",
224: .type = OPTION_ARG_FORMAT,
225: .opt.value = &dhparam_config.outformat,
226: },
227: {
228: .name = "text",
229: .desc = "Print DH parameters in plain text",
230: .type = OPTION_FLAG,
231: .opt.flag = &dhparam_config.text,
232: },
233: { NULL },
234: };
235:
236: static void
237: dhparam_usage()
238: {
239: fprintf(stderr,
240: "usage: dhparam [-2 | -5] [-C] [-check] [-dsaparam] [-engine id]\n"
241: " [-in file] [-inform DER | PEM] [-noout] [-out file]\n"
242: " [-outform DER | PEM] [-text] [numbits]\n\n");
243: options_usage(dhparam_options);
244: }
1.1 jsing 245:
246: static int dh_cb(int p, int n, BN_GENCB * cb);
247:
248: int
249: dhparam_main(int argc, char **argv)
250: {
1.4 jsing 251: BIO *in = NULL, *out = NULL;
252: char *num_bits = NULL;
1.1 jsing 253: DH *dh = NULL;
1.4 jsing 254: int num = 0;
255: int ret = 1;
256: int i;
257:
258: memset(&dhparam_config, 0, sizeof(dhparam_config));
259:
260: dhparam_config.informat = FORMAT_PEM;
261: dhparam_config.outformat = FORMAT_PEM;
262:
263: if (options_parse(argc, argv, dhparam_options, &num_bits, NULL) != 0) {
264: dhparam_usage();
265: return (1);
266: }
1.1 jsing 267:
1.4 jsing 268: if (num_bits != NULL) {
269: if(sscanf(num_bits, "%d", &num) == 0 || num <= 0) {
270: BIO_printf(bio_err, "invalid number of bits: %s\n",
271: num_bits);
272: return (1);
1.1 jsing 273: }
274: }
275:
276: #ifndef OPENSSL_NO_ENGINE
1.4 jsing 277: setup_engine(bio_err, dhparam_config.engine, 0);
1.1 jsing 278: #endif
279:
1.4 jsing 280: if (dhparam_config.g && !num)
1.1 jsing 281: num = DEFBITS;
282:
1.4 jsing 283: if (dhparam_config.dsaparam) {
284: if (dhparam_config.g) {
1.1 jsing 285: BIO_printf(bio_err, "generator may not be chosen for DSA parameters\n");
286: goto end;
287: }
1.4 jsing 288: } else {
1.1 jsing 289: /* DH parameters */
1.4 jsing 290: if (num && !dhparam_config.g)
291: dhparam_config.g = 2;
1.1 jsing 292: }
293:
294: if (num) {
295:
296: BN_GENCB cb;
297: BN_GENCB_set(&cb, dh_cb, bio_err);
1.4 jsing 298: if (dhparam_config.dsaparam) {
1.1 jsing 299: DSA *dsa = DSA_new();
300:
301: BIO_printf(bio_err, "Generating DSA parameters, %d bit long prime\n", num);
302: if (!dsa || !DSA_generate_parameters_ex(dsa, num,
303: NULL, 0, NULL, NULL, &cb)) {
304: if (dsa)
305: DSA_free(dsa);
306: ERR_print_errors(bio_err);
307: goto end;
308: }
309: dh = DSA_dup_DH(dsa);
310: DSA_free(dsa);
311: if (dh == NULL) {
312: ERR_print_errors(bio_err);
313: goto end;
314: }
1.4 jsing 315: } else {
1.1 jsing 316: dh = DH_new();
1.4 jsing 317: BIO_printf(bio_err, "Generating DH parameters, %d bit long safe prime, generator %d\n", num, dhparam_config.g);
1.1 jsing 318: BIO_printf(bio_err, "This is going to take a long time\n");
1.4 jsing 319: if (!dh || !DH_generate_parameters_ex(dh, num, dhparam_config.g, &cb)) {
1.1 jsing 320: ERR_print_errors(bio_err);
321: goto end;
322: }
323: }
324: } else {
325:
326: in = BIO_new(BIO_s_file());
327: if (in == NULL) {
328: ERR_print_errors(bio_err);
329: goto end;
330: }
1.4 jsing 331: if (dhparam_config.infile == NULL)
1.1 jsing 332: BIO_set_fp(in, stdin, BIO_NOCLOSE);
333: else {
1.4 jsing 334: if (BIO_read_filename(in, dhparam_config.infile) <= 0) {
335: perror(dhparam_config.infile);
1.1 jsing 336: goto end;
337: }
338: }
339:
1.4 jsing 340: if (dhparam_config.informat != FORMAT_ASN1 &&
341: dhparam_config.informat != FORMAT_PEM) {
1.1 jsing 342: BIO_printf(bio_err, "bad input format specified\n");
343: goto end;
344: }
1.4 jsing 345: if (dhparam_config.dsaparam) {
1.1 jsing 346: DSA *dsa;
347:
1.4 jsing 348: if (dhparam_config.informat == FORMAT_ASN1)
1.1 jsing 349: dsa = d2i_DSAparams_bio(in, NULL);
350: else /* informat == FORMAT_PEM */
351: dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL);
352:
353: if (dsa == NULL) {
354: BIO_printf(bio_err, "unable to load DSA parameters\n");
355: ERR_print_errors(bio_err);
356: goto end;
357: }
358: dh = DSA_dup_DH(dsa);
359: DSA_free(dsa);
360: if (dh == NULL) {
361: ERR_print_errors(bio_err);
362: goto end;
363: }
364: } else
365: {
1.4 jsing 366: if (dhparam_config.informat == FORMAT_ASN1)
1.1 jsing 367: dh = d2i_DHparams_bio(in, NULL);
368: else /* informat == FORMAT_PEM */
369: dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
370:
371: if (dh == NULL) {
372: BIO_printf(bio_err, "unable to load DH parameters\n");
373: ERR_print_errors(bio_err);
374: goto end;
375: }
376: }
377:
378: /* dh != NULL */
379: }
380:
381: out = BIO_new(BIO_s_file());
382: if (out == NULL) {
383: ERR_print_errors(bio_err);
384: goto end;
385: }
1.4 jsing 386: if (dhparam_config.outfile == NULL) {
1.1 jsing 387: BIO_set_fp(out, stdout, BIO_NOCLOSE);
388: } else {
1.4 jsing 389: if (BIO_write_filename(out, dhparam_config.outfile) <= 0) {
390: perror(dhparam_config.outfile);
1.1 jsing 391: goto end;
392: }
393: }
394:
395:
1.4 jsing 396: if (dhparam_config.text) {
1.1 jsing 397: DHparams_print(out, dh);
398: }
1.4 jsing 399: if (dhparam_config.check) {
1.1 jsing 400: if (!DH_check(dh, &i)) {
401: ERR_print_errors(bio_err);
402: goto end;
403: }
404: if (i & DH_CHECK_P_NOT_PRIME)
405: printf("p value is not prime\n");
406: if (i & DH_CHECK_P_NOT_SAFE_PRIME)
407: printf("p value is not a safe prime\n");
408: if (i & DH_UNABLE_TO_CHECK_GENERATOR)
409: printf("unable to check the generator value\n");
410: if (i & DH_NOT_SUITABLE_GENERATOR)
411: printf("the g value is not a generator\n");
412: if (i == 0)
413: printf("DH parameters appear to be ok.\n");
414: }
1.4 jsing 415: if (dhparam_config.C) {
1.1 jsing 416: unsigned char *data;
417: int len, l, bits;
418:
419: len = BN_num_bytes(dh->p);
420: bits = BN_num_bits(dh->p);
421: data = malloc(len);
422: if (data == NULL) {
423: perror("malloc");
424: goto end;
425: }
426: printf("#ifndef HEADER_DH_H\n"
427: "#include <openssl/dh.h>\n"
428: "#endif\n");
429: printf("DH *get_dh%d()\n\t{\n", bits);
430:
431: l = BN_bn2bin(dh->p, data);
432: printf("\tstatic unsigned char dh%d_p[] = {", bits);
433: for (i = 0; i < l; i++) {
434: if ((i % 12) == 0)
435: printf("\n\t\t");
436: printf("0x%02X, ", data[i]);
437: }
438: printf("\n\t\t};\n");
439:
440: l = BN_bn2bin(dh->g, data);
441: printf("\tstatic unsigned char dh%d_g[] = {", bits);
442: for (i = 0; i < l; i++) {
443: if ((i % 12) == 0)
444: printf("\n\t\t");
445: printf("0x%02X, ", data[i]);
446: }
447: printf("\n\t\t};\n");
448:
449: printf("\tDH *dh;\n\n");
450: printf("\tif ((dh = DH_new()) == NULL) return(NULL);\n");
451: printf("\tdh->p = BN_bin2bn(dh%d_p, sizeof(dh%d_p), NULL);\n",
452: bits, bits);
453: printf("\tdh->g = BN_bin2bn(dh%d_g, sizeof(dh%d_g), NULL);\n",
454: bits, bits);
455: printf("\tif ((dh->p == NULL) || (dh->g == NULL))\n");
456: printf("\t\t{ DH_free(dh); return(NULL); }\n");
457: if (dh->length)
458: printf("\tdh->length = %ld;\n", dh->length);
459: printf("\treturn(dh);\n\t}\n");
460: free(data);
461: }
1.4 jsing 462: if (!dhparam_config.noout) {
463: if (dhparam_config.outformat == FORMAT_ASN1)
1.1 jsing 464: i = i2d_DHparams_bio(out, dh);
1.4 jsing 465: else if (dhparam_config.outformat == FORMAT_PEM)
1.1 jsing 466: i = PEM_write_bio_DHparams(out, dh);
467: else {
468: BIO_printf(bio_err, "bad output format specified for outfile\n");
469: goto end;
470: }
471: if (!i) {
472: BIO_printf(bio_err, "unable to write DH parameters\n");
473: ERR_print_errors(bio_err);
474: goto end;
475: }
476: }
477: ret = 0;
478:
479: end:
480: BIO_free(in);
481: if (out != NULL)
482: BIO_free_all(out);
483: if (dh != NULL)
484: DH_free(dh);
485:
486: return (ret);
487: }
488:
489: /* dh_cb is identical to dsa_cb in apps/dsaparam.c */
490: static int
491: dh_cb(int p, int n, BN_GENCB * cb)
492: {
493: char c = '*';
494:
495: if (p == 0)
496: c = '.';
497: if (p == 1)
498: c = '+';
499: if (p == 2)
500: c = '*';
501: if (p == 3)
502: c = '\n';
503: BIO_write(cb->arg, &c, 1);
504: (void) BIO_flush(cb->arg);
505: return 1;
506: }
507:
508: #endif
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