Annotation of src/usr.bin/openssl/dhparam.c, Revision 1.8
1.8 ! doug 1: /* $OpenBSD: dhparam.c,v 1.7 2015/10/10 22:28:51 doug 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: int g;
139: char *infile;
140: int informat;
141: int noout;
142: char *outfile;
143: int outformat;
144: int text;
145: } dhparam_config;
146:
147: struct option dhparam_options[] = {
148: {
149: .name = "2",
150: .desc = "Generate DH parameters with a generator value of 2 "
151: "(default)",
152: .type = OPTION_VALUE,
153: .opt.value = &dhparam_config.g,
154: .value = 2,
155: },
156: {
157: .name = "5",
158: .desc = "Generate DH parameters with a generator value of 5",
159: .type = OPTION_VALUE,
160: .opt.value = &dhparam_config.g,
161: .value = 5,
162: },
163: {
164: .name = "C",
165: .desc = "Convert DH parameters into C code",
166: .type = OPTION_FLAG,
167: .opt.flag = &dhparam_config.C,
168: },
169: {
170: .name = "check",
171: .desc = "Check the DH parameters",
172: .type = OPTION_FLAG,
173: .opt.flag = &dhparam_config.check,
174: },
175: {
176: .name = "dsaparam",
177: .desc = "Read or generate DSA parameters and convert to DH",
178: .type = OPTION_FLAG,
179: .opt.flag = &dhparam_config.dsaparam,
180: },
181: {
182: .name = "in",
183: .argname = "file",
184: .desc = "Input file (default stdin)",
185: .type = OPTION_ARG,
186: .opt.arg = &dhparam_config.infile,
187: },
188: {
189: .name = "inform",
190: .argname = "format",
191: .desc = "Input format (DER or PEM (default))",
192: .type = OPTION_ARG_FORMAT,
193: .opt.value = &dhparam_config.informat,
194: },
195: {
196: .name = "noout",
197: .desc = "Do not output encoded version of DH parameters",
198: .type = OPTION_FLAG,
199: .opt.flag = &dhparam_config.noout,
200: },
201: {
202: .name = "out",
203: .argname = "file",
204: .desc = "Output file (default stdout)",
205: .type = OPTION_ARG,
206: .opt.arg = &dhparam_config.outfile,
207: },
208: {
209: .name = "outform",
210: .argname = "format",
211: .desc = "Output format (DER or PEM (default))",
212: .type = OPTION_ARG_FORMAT,
213: .opt.value = &dhparam_config.outformat,
214: },
215: {
216: .name = "text",
217: .desc = "Print DH parameters in plain text",
218: .type = OPTION_FLAG,
219: .opt.flag = &dhparam_config.text,
220: },
221: { NULL },
222: };
223:
224: static void
225: dhparam_usage()
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:
234: static int dh_cb(int p, int n, BN_GENCB * cb);
235:
236: int
237: dhparam_main(int argc, char **argv)
238: {
1.4 jsing 239: BIO *in = NULL, *out = NULL;
240: char *num_bits = NULL;
1.1 jsing 241: DH *dh = NULL;
1.4 jsing 242: int num = 0;
243: int ret = 1;
244: int i;
1.7 doug 245:
246: if (single_execution) {
1.8 ! doug 247: if (pledge("stdio rpath wpath cpath", NULL) == -1) {
1.7 doug 248: perror("pledge");
1.8 ! doug 249: exit(1);
! 250: }
1.7 doug 251: }
1.4 jsing 252:
253: memset(&dhparam_config, 0, sizeof(dhparam_config));
254:
255: dhparam_config.informat = FORMAT_PEM;
256: dhparam_config.outformat = FORMAT_PEM;
257:
258: if (options_parse(argc, argv, dhparam_options, &num_bits, NULL) != 0) {
259: dhparam_usage();
260: return (1);
261: }
1.1 jsing 262:
1.4 jsing 263: if (num_bits != NULL) {
264: if(sscanf(num_bits, "%d", &num) == 0 || num <= 0) {
265: BIO_printf(bio_err, "invalid number of bits: %s\n",
266: num_bits);
267: return (1);
1.1 jsing 268: }
269: }
270:
1.4 jsing 271: if (dhparam_config.g && !num)
1.1 jsing 272: num = DEFBITS;
273:
1.4 jsing 274: if (dhparam_config.dsaparam) {
275: if (dhparam_config.g) {
1.1 jsing 276: BIO_printf(bio_err, "generator may not be chosen for DSA parameters\n");
277: goto end;
278: }
1.4 jsing 279: } else {
1.1 jsing 280: /* DH parameters */
1.4 jsing 281: if (num && !dhparam_config.g)
282: dhparam_config.g = 2;
1.1 jsing 283: }
284:
285: if (num) {
286:
287: BN_GENCB cb;
288: BN_GENCB_set(&cb, dh_cb, bio_err);
1.4 jsing 289: if (dhparam_config.dsaparam) {
1.1 jsing 290: DSA *dsa = DSA_new();
291:
292: BIO_printf(bio_err, "Generating DSA parameters, %d bit long prime\n", num);
293: if (!dsa || !DSA_generate_parameters_ex(dsa, num,
294: NULL, 0, NULL, NULL, &cb)) {
295: if (dsa)
296: DSA_free(dsa);
297: ERR_print_errors(bio_err);
298: goto end;
299: }
300: dh = DSA_dup_DH(dsa);
301: DSA_free(dsa);
302: if (dh == NULL) {
303: ERR_print_errors(bio_err);
304: goto end;
305: }
1.4 jsing 306: } else {
1.1 jsing 307: dh = DH_new();
1.4 jsing 308: BIO_printf(bio_err, "Generating DH parameters, %d bit long safe prime, generator %d\n", num, dhparam_config.g);
1.1 jsing 309: BIO_printf(bio_err, "This is going to take a long time\n");
1.4 jsing 310: if (!dh || !DH_generate_parameters_ex(dh, num, dhparam_config.g, &cb)) {
1.1 jsing 311: ERR_print_errors(bio_err);
312: goto end;
313: }
314: }
315: } else {
316:
317: in = BIO_new(BIO_s_file());
318: if (in == NULL) {
319: ERR_print_errors(bio_err);
320: goto end;
321: }
1.4 jsing 322: if (dhparam_config.infile == NULL)
1.1 jsing 323: BIO_set_fp(in, stdin, BIO_NOCLOSE);
324: else {
1.4 jsing 325: if (BIO_read_filename(in, dhparam_config.infile) <= 0) {
326: perror(dhparam_config.infile);
1.1 jsing 327: goto end;
328: }
329: }
330:
1.4 jsing 331: if (dhparam_config.informat != FORMAT_ASN1 &&
332: dhparam_config.informat != FORMAT_PEM) {
1.1 jsing 333: BIO_printf(bio_err, "bad input format specified\n");
334: goto end;
335: }
1.4 jsing 336: if (dhparam_config.dsaparam) {
1.1 jsing 337: DSA *dsa;
338:
1.4 jsing 339: if (dhparam_config.informat == FORMAT_ASN1)
1.1 jsing 340: dsa = d2i_DSAparams_bio(in, NULL);
341: else /* informat == FORMAT_PEM */
342: dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL);
343:
344: if (dsa == NULL) {
345: BIO_printf(bio_err, "unable to load DSA parameters\n");
346: ERR_print_errors(bio_err);
347: goto end;
348: }
349: dh = DSA_dup_DH(dsa);
350: DSA_free(dsa);
351: if (dh == NULL) {
352: ERR_print_errors(bio_err);
353: goto end;
354: }
355: } else
356: {
1.4 jsing 357: if (dhparam_config.informat == FORMAT_ASN1)
1.1 jsing 358: dh = d2i_DHparams_bio(in, NULL);
359: else /* informat == FORMAT_PEM */
360: dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
361:
362: if (dh == NULL) {
363: BIO_printf(bio_err, "unable to load DH parameters\n");
364: ERR_print_errors(bio_err);
365: goto end;
366: }
367: }
368:
369: /* dh != NULL */
370: }
371:
372: out = BIO_new(BIO_s_file());
373: if (out == NULL) {
374: ERR_print_errors(bio_err);
375: goto end;
376: }
1.4 jsing 377: if (dhparam_config.outfile == NULL) {
1.1 jsing 378: BIO_set_fp(out, stdout, BIO_NOCLOSE);
379: } else {
1.4 jsing 380: if (BIO_write_filename(out, dhparam_config.outfile) <= 0) {
381: perror(dhparam_config.outfile);
1.1 jsing 382: goto end;
383: }
384: }
385:
386:
1.4 jsing 387: if (dhparam_config.text) {
1.1 jsing 388: DHparams_print(out, dh);
389: }
1.4 jsing 390: if (dhparam_config.check) {
1.1 jsing 391: if (!DH_check(dh, &i)) {
392: ERR_print_errors(bio_err);
393: goto end;
394: }
395: if (i & DH_CHECK_P_NOT_PRIME)
396: printf("p value is not prime\n");
397: if (i & DH_CHECK_P_NOT_SAFE_PRIME)
398: printf("p value is not a safe prime\n");
399: if (i & DH_UNABLE_TO_CHECK_GENERATOR)
400: printf("unable to check the generator value\n");
401: if (i & DH_NOT_SUITABLE_GENERATOR)
402: printf("the g value is not a generator\n");
403: if (i == 0)
404: printf("DH parameters appear to be ok.\n");
405: }
1.4 jsing 406: if (dhparam_config.C) {
1.1 jsing 407: unsigned char *data;
408: int len, l, bits;
409:
410: len = BN_num_bytes(dh->p);
411: bits = BN_num_bits(dh->p);
412: data = malloc(len);
413: if (data == NULL) {
414: perror("malloc");
415: goto end;
416: }
417: printf("#ifndef HEADER_DH_H\n"
418: "#include <openssl/dh.h>\n"
419: "#endif\n");
420: printf("DH *get_dh%d()\n\t{\n", bits);
421:
422: l = BN_bn2bin(dh->p, data);
423: printf("\tstatic unsigned char dh%d_p[] = {", bits);
424: for (i = 0; i < l; i++) {
425: if ((i % 12) == 0)
426: printf("\n\t\t");
427: printf("0x%02X, ", data[i]);
428: }
429: printf("\n\t\t};\n");
430:
431: l = BN_bn2bin(dh->g, data);
432: printf("\tstatic unsigned char dh%d_g[] = {", 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: printf("\tDH *dh;\n\n");
441: printf("\tif ((dh = DH_new()) == NULL) return(NULL);\n");
442: printf("\tdh->p = BN_bin2bn(dh%d_p, sizeof(dh%d_p), NULL);\n",
443: bits, bits);
444: printf("\tdh->g = BN_bin2bn(dh%d_g, sizeof(dh%d_g), NULL);\n",
445: bits, bits);
446: printf("\tif ((dh->p == NULL) || (dh->g == NULL))\n");
447: printf("\t\t{ DH_free(dh); return(NULL); }\n");
448: if (dh->length)
449: printf("\tdh->length = %ld;\n", dh->length);
450: printf("\treturn(dh);\n\t}\n");
451: free(data);
452: }
1.4 jsing 453: if (!dhparam_config.noout) {
454: if (dhparam_config.outformat == FORMAT_ASN1)
1.1 jsing 455: i = i2d_DHparams_bio(out, dh);
1.4 jsing 456: else if (dhparam_config.outformat == FORMAT_PEM)
1.1 jsing 457: i = PEM_write_bio_DHparams(out, dh);
458: else {
459: BIO_printf(bio_err, "bad output format specified for outfile\n");
460: goto end;
461: }
462: if (!i) {
463: BIO_printf(bio_err, "unable to write DH parameters\n");
464: ERR_print_errors(bio_err);
465: goto end;
466: }
467: }
468: ret = 0;
469:
470: end:
471: BIO_free(in);
472: if (out != NULL)
473: BIO_free_all(out);
474: if (dh != NULL)
475: DH_free(dh);
476:
477: return (ret);
478: }
479:
480: /* dh_cb is identical to dsa_cb in apps/dsaparam.c */
481: static int
482: dh_cb(int p, int n, BN_GENCB * cb)
483: {
484: char c = '*';
485:
486: if (p == 0)
487: c = '.';
488: if (p == 1)
489: c = '+';
490: if (p == 2)
491: c = '*';
492: if (p == 3)
493: c = '\n';
494: BIO_write(cb->arg, &c, 1);
495: (void) BIO_flush(cb->arg);
496: return 1;
497: }
498:
499: #endif
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