1 /* $OpenBSD: gendh.c,v 1.12 2021/11/20 18:10:48 tb Exp $ */ 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 72 #include <limits.h> 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 89 static struct { 90 int g; 91 char *outfile; 92 } gendh_config; 93 94 static const 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, 124 "usage: gendh [-2 | -5] [-out file] [numbits]\n\n"); 125 options_usage(gendh_options); 126 } 127 128 int 129 gendh_main(int argc, char **argv) 130 { 131 BN_GENCB *cb = NULL; 132 DH *dh = NULL; 133 int ret = 1, numbits = DEFBITS; 134 BIO *out = NULL; 135 char *strbits = NULL; 136 137 if (single_execution) { 138 if (pledge("stdio cpath wpath rpath", NULL) == -1) { 139 perror("pledge"); 140 exit(1); 141 } 142 } 143 144 if ((cb = BN_GENCB_new()) == NULL) { 145 BIO_printf(bio_err, "Error allocating BN_GENCB object\n"); 146 goto end; 147 } 148 149 BN_GENCB_set(cb, dh_cb, bio_err); 150 151 memset(&gendh_config, 0, sizeof(gendh_config)); 152 153 gendh_config.g = 2; 154 155 if (options_parse(argc, argv, gendh_options, &strbits, NULL) != 0) { 156 gendh_usage(); 157 goto end; 158 } 159 160 if (strbits != NULL) { 161 const char *errstr; 162 numbits = strtonum(strbits, 0, INT_MAX, &errstr); 163 if (errstr) { 164 fprintf(stderr, "Invalid number of bits: %s\n", errstr); 165 goto end; 166 } 167 } 168 169 out = BIO_new(BIO_s_file()); 170 if (out == NULL) { 171 ERR_print_errors(bio_err); 172 goto end; 173 } 174 if (gendh_config.outfile == NULL) { 175 BIO_set_fp(out, stdout, BIO_NOCLOSE); 176 } else { 177 if (BIO_write_filename(out, gendh_config.outfile) <= 0) { 178 perror(gendh_config.outfile); 179 goto end; 180 } 181 } 182 183 BIO_printf(bio_err, "Generating DH parameters, %d bit long safe prime," 184 " generator %d\n", numbits, gendh_config.g); 185 BIO_printf(bio_err, "This is going to take a long time\n"); 186 187 if (((dh = DH_new()) == NULL) || 188 !DH_generate_parameters_ex(dh, numbits, gendh_config.g, cb)) 189 goto end; 190 191 if (!PEM_write_bio_DHparams(out, dh)) 192 goto end; 193 ret = 0; 194 end: 195 if (ret != 0) 196 ERR_print_errors(bio_err); 197 BIO_free_all(out); 198 BN_GENCB_free(cb); 199 DH_free(dh); 200 201 return (ret); 202 } 203 204 static int 205 dh_cb(int p, int n, BN_GENCB *cb) 206 { 207 char c = '*'; 208 209 if (p == 0) 210 c = '.'; 211 if (p == 1) 212 c = '+'; 213 if (p == 2) 214 c = '*'; 215 if (p == 3) 216 c = '\n'; 217 BIO_write(BN_GENCB_get_arg(cb), &c, 1); 218 (void) BIO_flush(BN_GENCB_get_arg(cb)); 219 return 1; 220 } 221 #endif 222