1 /* $OpenBSD: dh.c,v 1.13 2022/01/14 09:21:54 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 C; 79 int check; 80 char *infile; 81 int informat; 82 int noout; 83 char *outfile; 84 int outformat; 85 int text; 86 } dh_config; 87 88 static const struct option dh_options[] = { 89 { 90 .name = "C", 91 .desc = "Convert DH parameters into C code", 92 .type = OPTION_FLAG, 93 .opt.flag = &dh_config.C, 94 }, 95 { 96 .name = "check", 97 .desc = "Check the DH parameters", 98 .type = OPTION_FLAG, 99 .opt.flag = &dh_config.check, 100 }, 101 { 102 .name = "in", 103 .argname = "file", 104 .desc = "Input file (default stdin)", 105 .type = OPTION_ARG, 106 .opt.arg = &dh_config.infile, 107 }, 108 { 109 .name = "inform", 110 .argname = "format", 111 .desc = "Input format (DER or PEM (default))", 112 .type = OPTION_ARG_FORMAT, 113 .opt.value = &dh_config.informat, 114 }, 115 { 116 .name = "noout", 117 .desc = "No output", 118 .type = OPTION_FLAG, 119 .opt.flag = &dh_config.noout, 120 }, 121 { 122 .name = "out", 123 .argname = "file", 124 .desc = "Output file (default stdout)", 125 .type = OPTION_ARG, 126 .opt.arg = &dh_config.outfile, 127 }, 128 { 129 .name = "outform", 130 .argname = "format", 131 .desc = "Output format (DER or PEM (default))", 132 .type = OPTION_ARG_FORMAT, 133 .opt.value = &dh_config.outformat, 134 }, 135 { 136 .name = "text", 137 .desc = "Print a text form of the DH parameters", 138 .type = OPTION_FLAG, 139 .opt.flag = &dh_config.text, 140 }, 141 { NULL }, 142 }; 143 144 static void 145 dh_usage(void) 146 { 147 fprintf(stderr, 148 "usage: dh [-C] [-check] [-in file] [-inform format]\n" 149 " [-noout] [-out file] [-outform format] [-text]\n\n"); 150 options_usage(dh_options); 151 } 152 153 int 154 dh_main(int argc, char **argv) 155 { 156 DH *dh = NULL; 157 int i; 158 BIO *in = NULL, *out = NULL; 159 int ret = 1; 160 161 if (single_execution) { 162 if (pledge("stdio cpath wpath rpath", NULL) == -1) { 163 perror("pledge"); 164 exit(1); 165 } 166 } 167 168 memset(&dh_config, 0, sizeof(dh_config)); 169 170 dh_config.informat = FORMAT_PEM; 171 dh_config.outformat = FORMAT_PEM; 172 173 if (options_parse(argc, argv, dh_options, NULL, NULL) != 0) { 174 dh_usage(); 175 goto end; 176 } 177 178 in = BIO_new(BIO_s_file()); 179 out = BIO_new(BIO_s_file()); 180 if (in == NULL || out == NULL) { 181 ERR_print_errors(bio_err); 182 goto end; 183 } 184 if (dh_config.infile == NULL) 185 BIO_set_fp(in, stdin, BIO_NOCLOSE); 186 else { 187 if (BIO_read_filename(in, dh_config.infile) <= 0) { 188 perror(dh_config.infile); 189 goto end; 190 } 191 } 192 if (dh_config.outfile == NULL) { 193 BIO_set_fp(out, stdout, BIO_NOCLOSE); 194 } else { 195 if (BIO_write_filename(out, dh_config.outfile) <= 0) { 196 perror(dh_config.outfile); 197 goto end; 198 } 199 } 200 201 if (dh_config.informat == FORMAT_ASN1) 202 dh = d2i_DHparams_bio(in, NULL); 203 else if (dh_config.informat == FORMAT_PEM) 204 dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL); 205 else { 206 BIO_printf(bio_err, "bad input format specified\n"); 207 goto end; 208 } 209 if (dh == NULL) { 210 BIO_printf(bio_err, "unable to load DH parameters\n"); 211 ERR_print_errors(bio_err); 212 goto end; 213 } 214 if (dh_config.text) { 215 DHparams_print(out, dh); 216 } 217 if (dh_config.check) { 218 if (!DH_check(dh, &i)) { 219 ERR_print_errors(bio_err); 220 goto end; 221 } 222 if (i & DH_CHECK_P_NOT_PRIME) 223 printf("p value is not prime\n"); 224 if (i & DH_CHECK_P_NOT_SAFE_PRIME) 225 printf("p value is not a safe prime\n"); 226 if (i & DH_UNABLE_TO_CHECK_GENERATOR) 227 printf("unable to check the generator value\n"); 228 if (i & DH_NOT_SUITABLE_GENERATOR) 229 printf("the g value is not a generator\n"); 230 if (i == 0) 231 printf("DH parameters appear to be ok.\n"); 232 } 233 if (dh_config.C) { 234 unsigned char *data; 235 int len, l, bits; 236 237 len = BN_num_bytes(DH_get0_p(dh)); 238 bits = BN_num_bits(DH_get0_p(dh)); 239 data = malloc(len); 240 if (data == NULL) { 241 perror("malloc"); 242 goto end; 243 } 244 l = BN_bn2bin(DH_get0_p(dh), data); 245 printf("static unsigned char dh%d_p[] = {", bits); 246 for (i = 0; i < l; i++) { 247 if ((i % 12) == 0) 248 printf("\n\t"); 249 printf("0x%02X, ", data[i]); 250 } 251 printf("\n\t};\n"); 252 253 l = BN_bn2bin(DH_get0_g(dh), data); 254 printf("static unsigned char dh%d_g[] = {", 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\n"); 261 262 printf("DH *get_dh%d()\n\t{\n", bits); 263 printf("\tDH *dh;\n"); 264 printf("\tBIGNUM *p = NULL, *g = NULL;\n\n"); 265 printf("\tif ((dh = DH_new()) == NULL) return(NULL);\n"); 266 printf("\tp = BN_bin2bn(dh%d_p, sizeof(dh%d_p), NULL);\n", 267 bits, bits); 268 printf("\tg = BN_bin2bn(dh%d_g, sizeof(dh%d_g), NULL);\n", 269 bits, bits); 270 printf("\tif (p == NULL || g == NULL)\n"); 271 printf("\t\t{ BN_free(p); BN_free(q); DH_free(dh); return(NULL); }\n"); 272 printf("\tDH_set0_pqg(dh, p, NULL, g);\n"); 273 printf("\treturn(dh);\n\t}\n"); 274 free(data); 275 } 276 if (!dh_config.noout) { 277 if (dh_config.outformat == FORMAT_ASN1) 278 i = i2d_DHparams_bio(out, dh); 279 else if (dh_config.outformat == FORMAT_PEM) 280 i = PEM_write_bio_DHparams(out, dh); 281 else { 282 BIO_printf(bio_err, "bad output format specified for outfile\n"); 283 goto end; 284 } 285 if (!i) { 286 BIO_printf(bio_err, "unable to write DH parameters\n"); 287 ERR_print_errors(bio_err); 288 goto end; 289 } 290 } 291 ret = 0; 292 293 end: 294 BIO_free(in); 295 BIO_free_all(out); 296 DH_free(dh); 297 298 return (ret); 299 } 300 #endif 301