Annotation of src/usr.bin/openssl/gendh.c, Revision 1.7
1.7 ! doug 1: /* $OpenBSD: gendh.c,v 1.6 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: #include <openssl/opensslconf.h>
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: #ifndef OPENSSL_NO_DH
68:
69: #include <sys/types.h>
70: #include <sys/stat.h>
71:
1.3 doug 72: #include <limits.h>
1.1 jsing 73: #include <stdio.h>
74: #include <string.h>
75:
76: #include "apps.h"
77:
78: #include <openssl/bio.h>
79: #include <openssl/bn.h>
80: #include <openssl/dh.h>
81: #include <openssl/err.h>
82: #include <openssl/pem.h>
83: #include <openssl/x509.h>
84:
85: #define DEFBITS 512
86:
87: static int dh_cb(int p, int n, BN_GENCB * cb);
88:
1.3 doug 89: static struct {
90: int g;
91: char *outfile;
92: } gendh_config;
93:
94: static struct option gendh_options[] = {
95: {
96: .name = "2",
97: .desc = "Generate DH parameters with a generator value of 2 "
98: "(default)",
99: .type = OPTION_VALUE,
100: .value = 2,
101: .opt.value = &gendh_config.g,
102: },
103: {
104: .name = "5",
105: .desc = "Generate DH parameters with a generator value of 5",
106: .type = OPTION_VALUE,
107: .value = 5,
108: .opt.value = &gendh_config.g,
109: },
110: {
111: .name = "out",
112: .argname = "file",
113: .desc = "Output file (default stdout)",
114: .type = OPTION_ARG,
115: .opt.arg = &gendh_config.outfile,
116: },
117: { NULL },
118: };
119:
120: static void
121: gendh_usage(void)
122: {
123: fprintf(stderr,
1.5 bcook 124: "usage: gendh [-2 | -5] [-out file] [numbits]\n\n");
1.3 doug 125: options_usage(gendh_options);
126: }
1.1 jsing 127:
128: int
129: gendh_main(int argc, char **argv)
130: {
131: BN_GENCB cb;
132: DH *dh = NULL;
1.3 doug 133: int ret = 1, numbits = DEFBITS;
1.1 jsing 134: BIO *out = NULL;
1.3 doug 135: char *strbits = NULL;
1.6 doug 136:
137: if (single_execution) {
1.7 ! doug 138: if (pledge("stdio rpath wpath cpath", NULL) == -1) {
1.6 doug 139: perror("pledge");
1.7 ! doug 140: exit(1);
! 141: }
1.6 doug 142: }
1.1 jsing 143:
144: BN_GENCB_set(&cb, dh_cb, bio_err);
145:
1.3 doug 146: memset(&gendh_config, 0, sizeof(gendh_config));
147:
148: gendh_config.g = 2;
149:
150: if (options_parse(argc, argv, gendh_options, &strbits, NULL) != 0) {
151: gendh_usage();
152: goto end;
153: }
154:
155: if (strbits != NULL) {
156: const char *errstr;
157: numbits = strtonum(strbits, 0, INT_MAX, &errstr);
158: if (errstr) {
159: fprintf(stderr, "Invalid number of bits: %s\n", errstr);
160: goto end;
1.1 jsing 161: }
162: }
163:
164: out = BIO_new(BIO_s_file());
165: if (out == NULL) {
166: ERR_print_errors(bio_err);
167: goto end;
168: }
1.3 doug 169: if (gendh_config.outfile == NULL) {
1.1 jsing 170: BIO_set_fp(out, stdout, BIO_NOCLOSE);
171: } else {
1.3 doug 172: if (BIO_write_filename(out, gendh_config.outfile) <= 0) {
173: perror(gendh_config.outfile);
1.1 jsing 174: goto end;
175: }
176: }
177:
1.3 doug 178: BIO_printf(bio_err, "Generating DH parameters, %d bit long safe prime,"
179: " generator %d\n", numbits, gendh_config.g);
1.1 jsing 180: BIO_printf(bio_err, "This is going to take a long time\n");
181:
1.3 doug 182: if (((dh = DH_new()) == NULL) ||
183: !DH_generate_parameters_ex(dh, numbits, gendh_config.g, &cb))
1.1 jsing 184: goto end;
185:
186: if (!PEM_write_bio_DHparams(out, dh))
187: goto end;
188: ret = 0;
189: end:
190: if (ret != 0)
191: ERR_print_errors(bio_err);
192: if (out != NULL)
193: BIO_free_all(out);
194: if (dh != NULL)
195: DH_free(dh);
196:
197: return (ret);
198: }
199:
200: static int
201: dh_cb(int p, int n, BN_GENCB * cb)
202: {
203: char c = '*';
204:
205: if (p == 0)
206: c = '.';
207: if (p == 1)
208: c = '+';
209: if (p == 2)
210: c = '*';
211: if (p == 3)
212: c = '\n';
213: BIO_write(cb->arg, &c, 1);
214: (void) BIO_flush(cb->arg);
215: return 1;
216: }
217: #endif
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