Annotation of src/usr.bin/openssl/dh.c, Revision 1.5
1.5 ! jsing 1: /* $OpenBSD: dh.c,v 1.4 2015/07/12 22:57:00 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> /* 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:
1.4 doug 77: static struct {
78: int C;
79: int check;
80: #ifndef OPENSSL_NO_ENGINE
81: char *engine;
82: #endif
83: char *infile;
84: int informat;
85: int noout;
86: char *outfile;
87: int outformat;
88: int text;
89: } dh_config;
90:
91: static struct option dh_options[] = {
92: {
93: .name = "C",
94: .desc = "Convert DH parameters into C code",
95: .type = OPTION_FLAG,
96: .opt.flag = &dh_config.C,
97: },
98: {
99: .name = "check",
100: .desc = "Check the DH parameters",
101: .type = OPTION_FLAG,
102: .opt.flag = &dh_config.check,
103: },
104: #ifndef OPENSSL_NO_ENGINE
105: {
106: .name = "engine",
107: .argname = "id",
108: .desc = "Use the engine specified by the given identifier",
109: .type = OPTION_ARG,
110: .opt.arg = &dh_config.engine,
111: },
112: #endif
113: {
114: .name = "in",
115: .argname = "file",
116: .desc = "Input file (default stdin)",
117: .type = OPTION_ARG,
118: .opt.arg = &dh_config.infile,
119: },
120: {
121: .name = "inform",
122: .argname = "format",
123: .desc = "Input format (DER or PEM (default))",
124: .type = OPTION_ARG_FORMAT,
125: .opt.value = &dh_config.informat,
126: },
127: {
128: .name = "noout",
129: .desc = "No output",
130: .type = OPTION_FLAG,
131: .opt.flag = &dh_config.noout,
132: },
133: {
134: .name = "out",
135: .argname = "file",
136: .desc = "Output file (default stdout)",
137: .type = OPTION_ARG,
138: .opt.arg = &dh_config.outfile,
139: },
140: {
141: .name = "outform",
142: .argname = "format",
143: .desc = "Output format (DER or PEM (default))",
144: .type = OPTION_ARG_FORMAT,
145: .opt.value = &dh_config.outformat,
146: },
147: {
148: .name = "text",
149: .desc = "Print a text form of the DH parameters",
150: .type = OPTION_FLAG,
151: .opt.flag = &dh_config.text,
152: },
153: { NULL },
154: };
155:
156: static void
157: dh_usage(void)
158: {
159: fprintf(stderr,
160: "usage: dh [-C] [-check] [-engine id] [-in file] [-inform format]\n"
161: " [-noout] [-out file] [-outform format] [-text]\n\n");
162: options_usage(dh_options);
163: }
1.1 jsing 164:
165: int
166: dh_main(int argc, char **argv)
167: {
168: DH *dh = NULL;
1.4 doug 169: int i;
1.1 jsing 170: BIO *in = NULL, *out = NULL;
1.4 doug 171: int ret = 1;
172:
173: memset(&dh_config, 0, sizeof(dh_config));
1.1 jsing 174:
1.4 doug 175: dh_config.informat = FORMAT_PEM;
176: dh_config.outformat = FORMAT_PEM;
1.1 jsing 177:
1.4 doug 178: if (options_parse(argc, argv, dh_options, NULL, NULL) != 0) {
179: dh_usage();
1.1 jsing 180: goto end;
181: }
182:
183: #ifndef OPENSSL_NO_ENGINE
1.4 doug 184: setup_engine(bio_err, dh_config.engine, 0);
1.1 jsing 185: #endif
186:
187: in = BIO_new(BIO_s_file());
188: out = BIO_new(BIO_s_file());
1.4 doug 189: if (in == NULL || out == NULL) {
1.1 jsing 190: ERR_print_errors(bio_err);
191: goto end;
192: }
1.4 doug 193: if (dh_config.infile == NULL)
1.1 jsing 194: BIO_set_fp(in, stdin, BIO_NOCLOSE);
195: else {
1.4 doug 196: if (BIO_read_filename(in, dh_config.infile) <= 0) {
197: perror(dh_config.infile);
1.1 jsing 198: goto end;
199: }
200: }
1.4 doug 201: if (dh_config.outfile == NULL) {
1.1 jsing 202: BIO_set_fp(out, stdout, BIO_NOCLOSE);
203: } else {
1.4 doug 204: if (BIO_write_filename(out, dh_config.outfile) <= 0) {
205: perror(dh_config.outfile);
1.1 jsing 206: goto end;
207: }
208: }
209:
1.4 doug 210: if (dh_config.informat == FORMAT_ASN1)
1.1 jsing 211: dh = d2i_DHparams_bio(in, NULL);
1.4 doug 212: else if (dh_config.informat == FORMAT_PEM)
1.1 jsing 213: dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
214: else {
215: BIO_printf(bio_err, "bad input format specified\n");
216: goto end;
217: }
218: if (dh == NULL) {
219: BIO_printf(bio_err, "unable to load DH parameters\n");
220: ERR_print_errors(bio_err);
221: goto end;
222: }
1.4 doug 223: if (dh_config.text) {
1.1 jsing 224: DHparams_print(out, dh);
225: }
1.4 doug 226: if (dh_config.check) {
1.1 jsing 227: if (!DH_check(dh, &i)) {
228: ERR_print_errors(bio_err);
229: goto end;
230: }
231: if (i & DH_CHECK_P_NOT_PRIME)
232: printf("p value is not prime\n");
233: if (i & DH_CHECK_P_NOT_SAFE_PRIME)
234: printf("p value is not a safe prime\n");
235: if (i & DH_UNABLE_TO_CHECK_GENERATOR)
236: printf("unable to check the generator value\n");
237: if (i & DH_NOT_SUITABLE_GENERATOR)
238: printf("the g value is not a generator\n");
239: if (i == 0)
240: printf("DH parameters appear to be ok.\n");
241: }
1.4 doug 242: if (dh_config.C) {
1.1 jsing 243: unsigned char *data;
244: int len, l, bits;
245:
246: len = BN_num_bytes(dh->p);
247: bits = BN_num_bits(dh->p);
248: data = malloc(len);
249: if (data == NULL) {
250: perror("malloc");
251: goto end;
252: }
253: l = BN_bn2bin(dh->p, data);
254: printf("static unsigned char dh%d_p[] = {", 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");
261:
262: l = BN_bn2bin(dh->g, data);
263: printf("static unsigned char dh%d_g[] = {", bits);
264: for (i = 0; i < l; i++) {
265: if ((i % 12) == 0)
266: printf("\n\t");
267: printf("0x%02X, ", data[i]);
268: }
269: printf("\n\t};\n\n");
270:
271: printf("DH *get_dh%d()\n\t{\n", bits);
272: printf("\tDH *dh;\n\n");
273: printf("\tif ((dh = DH_new()) == NULL) return(NULL);\n");
274: printf("\tdh->p = BN_bin2bn(dh%d_p, sizeof(dh%d_p), NULL);\n",
275: bits, bits);
276: printf("\tdh->g = BN_bin2bn(dh%d_g, sizeof(dh%d_g), NULL);\n",
277: bits, bits);
278: printf("\tif ((dh->p == NULL) || (dh->g == NULL))\n");
279: printf("\t\treturn(NULL);\n");
280: printf("\treturn(dh);\n\t}\n");
281: free(data);
282: }
1.4 doug 283: if (!dh_config.noout) {
284: if (dh_config.outformat == FORMAT_ASN1)
1.1 jsing 285: i = i2d_DHparams_bio(out, dh);
1.4 doug 286: else if (dh_config.outformat == FORMAT_PEM)
1.1 jsing 287: i = PEM_write_bio_DHparams(out, dh);
288: else {
289: BIO_printf(bio_err, "bad output format specified for outfile\n");
290: goto end;
291: }
292: if (!i) {
293: BIO_printf(bio_err, "unable to write DH parameters\n");
294: ERR_print_errors(bio_err);
295: goto end;
296: }
297: }
298: ret = 0;
299:
300: end:
301: BIO_free(in);
302: if (out != NULL)
303: BIO_free_all(out);
304: if (dh != NULL)
305: DH_free(dh);
306:
307: return (ret);
308: }
309: #endif
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