1 /* $OpenBSD: dh.c,v 1.16 2025/01/19 10:24:17 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> /* 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 77 static struct { 78 int check; 79 char *infile; 80 int informat; 81 int noout; 82 char *outfile; 83 int outformat; 84 int text; 85 } cfg; 86 87 static const struct option dh_options[] = { 88 { 89 .name = "check", 90 .desc = "Check the DH parameters", 91 .type = OPTION_FLAG, 92 .opt.flag = &cfg.check, 93 }, 94 { 95 .name = "in", 96 .argname = "file", 97 .desc = "Input file (default stdin)", 98 .type = OPTION_ARG, 99 .opt.arg = &cfg.infile, 100 }, 101 { 102 .name = "inform", 103 .argname = "format", 104 .desc = "Input format (DER or PEM (default))", 105 .type = OPTION_ARG_FORMAT, 106 .opt.value = &cfg.informat, 107 }, 108 { 109 .name = "noout", 110 .desc = "No output", 111 .type = OPTION_FLAG, 112 .opt.flag = &cfg.noout, 113 }, 114 { 115 .name = "out", 116 .argname = "file", 117 .desc = "Output file (default stdout)", 118 .type = OPTION_ARG, 119 .opt.arg = &cfg.outfile, 120 }, 121 { 122 .name = "outform", 123 .argname = "format", 124 .desc = "Output format (DER or PEM (default))", 125 .type = OPTION_ARG_FORMAT, 126 .opt.value = &cfg.outformat, 127 }, 128 { 129 .name = "text", 130 .desc = "Print a text form of the DH parameters", 131 .type = OPTION_FLAG, 132 .opt.flag = &cfg.text, 133 }, 134 { NULL }, 135 }; 136 137 static void 138 dh_usage(void) 139 { 140 fprintf(stderr, 141 "usage: dh [-check] [-in file] [-inform format]\n" 142 " [-noout] [-out file] [-outform format] [-text]\n\n"); 143 options_usage(dh_options); 144 } 145 146 int 147 dh_main(int argc, char **argv) 148 { 149 DH *dh = NULL; 150 int i; 151 BIO *in = NULL, *out = NULL; 152 int ret = 1; 153 154 if (pledge("stdio cpath wpath rpath", NULL) == -1) { 155 perror("pledge"); 156 exit(1); 157 } 158 159 memset(&cfg, 0, sizeof(cfg)); 160 161 cfg.informat = FORMAT_PEM; 162 cfg.outformat = FORMAT_PEM; 163 164 if (options_parse(argc, argv, dh_options, NULL, NULL) != 0) { 165 dh_usage(); 166 goto end; 167 } 168 169 in = BIO_new(BIO_s_file()); 170 out = BIO_new(BIO_s_file()); 171 if (in == NULL || out == NULL) { 172 ERR_print_errors(bio_err); 173 goto end; 174 } 175 if (cfg.infile == NULL) 176 BIO_set_fp(in, stdin, BIO_NOCLOSE); 177 else { 178 if (BIO_read_filename(in, cfg.infile) <= 0) { 179 perror(cfg.infile); 180 goto end; 181 } 182 } 183 if (cfg.outfile == NULL) { 184 BIO_set_fp(out, stdout, BIO_NOCLOSE); 185 } else { 186 if (BIO_write_filename(out, cfg.outfile) <= 0) { 187 perror(cfg.outfile); 188 goto end; 189 } 190 } 191 192 if (cfg.informat == FORMAT_ASN1) 193 dh = d2i_DHparams_bio(in, NULL); 194 else if (cfg.informat == FORMAT_PEM) 195 dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL); 196 else { 197 BIO_printf(bio_err, "bad input format specified\n"); 198 goto end; 199 } 200 if (dh == NULL) { 201 BIO_printf(bio_err, "unable to load DH parameters\n"); 202 ERR_print_errors(bio_err); 203 goto end; 204 } 205 if (cfg.text) { 206 DHparams_print(out, dh); 207 } 208 if (cfg.check) { 209 if (!DH_check(dh, &i)) { 210 ERR_print_errors(bio_err); 211 goto end; 212 } 213 if (i & DH_CHECK_P_NOT_PRIME) 214 printf("p value is not prime\n"); 215 if (i & DH_CHECK_P_NOT_SAFE_PRIME) 216 printf("p value is not a safe prime\n"); 217 if (i & DH_UNABLE_TO_CHECK_GENERATOR) 218 printf("unable to check the generator value\n"); 219 if (i & DH_NOT_SUITABLE_GENERATOR) 220 printf("the g value is not a generator\n"); 221 if (i == 0) 222 printf("DH parameters appear to be ok.\n"); 223 } 224 if (!cfg.noout) { 225 if (cfg.outformat == FORMAT_ASN1) 226 i = i2d_DHparams_bio(out, dh); 227 else if (cfg.outformat == FORMAT_PEM) 228 i = PEM_write_bio_DHparams(out, dh); 229 else { 230 BIO_printf(bio_err, "bad output format specified for outfile\n"); 231 goto end; 232 } 233 if (!i) { 234 BIO_printf(bio_err, "unable to write DH parameters\n"); 235 ERR_print_errors(bio_err); 236 goto end; 237 } 238 } 239 ret = 0; 240 241 end: 242 BIO_free(in); 243 BIO_free_all(out); 244 DH_free(dh); 245 246 return (ret); 247 } 248 #endif 249