1 /* $OpenBSD: dhparam.c,v 1.14 2022/01/14 09:22:50 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 * Copyright (c) 1998-2000 The OpenSSL Project. All rights reserved. 60 * 61 * Redistribution and use in source and binary forms, with or without 62 * modification, are permitted provided that the following conditions 63 * are met: 64 * 65 * 1. Redistributions of source code must retain the above copyright 66 * notice, this list of conditions and the following disclaimer. 67 * 68 * 2. Redistributions in binary form must reproduce the above copyright 69 * notice, this list of conditions and the following disclaimer in 70 * the documentation and/or other materials provided with the 71 * distribution. 72 * 73 * 3. All advertising materials mentioning features or use of this 74 * software must display the following acknowledgment: 75 * "This product includes software developed by the OpenSSL Project 76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 77 * 78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 79 * endorse or promote products derived from this software without 80 * prior written permission. For written permission, please contact 81 * openssl-core@openssl.org. 82 * 83 * 5. Products derived from this software may not be called "OpenSSL" 84 * nor may "OpenSSL" appear in their names without prior written 85 * permission of the OpenSSL Project. 86 * 87 * 6. Redistributions of any form whatsoever must retain the following 88 * acknowledgment: 89 * "This product includes software developed by the OpenSSL Project 90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 91 * 92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 103 * OF THE POSSIBILITY OF SUCH DAMAGE. 104 * ==================================================================== 105 * 106 * This product includes cryptographic software written by Eric Young 107 * (eay@cryptsoft.com). This product includes software written by Tim 108 * Hudson (tjh@cryptsoft.com). 109 * 110 */ 111 112 #include <openssl/opensslconf.h> /* for OPENSSL_NO_DH */ 113 114 #ifndef OPENSSL_NO_DH 115 116 #include <stdio.h> 117 #include <stdlib.h> 118 #include <string.h> 119 #include <time.h> 120 121 #include "apps.h" 122 123 #include <openssl/bio.h> 124 #include <openssl/bn.h> 125 #include <openssl/err.h> 126 #include <openssl/dh.h> 127 #include <openssl/pem.h> 128 #include <openssl/x509.h> 129 130 #include <openssl/dsa.h> 131 132 #define DEFBITS 2048 133 134 struct { 135 int C; 136 int check; 137 int dsaparam; 138 int g; 139 char *infile; 140 int informat; 141 int noout; 142 char *outfile; 143 int outformat; 144 int text; 145 } dhparam_config; 146 147 static const struct option dhparam_options[] = { 148 { 149 .name = "2", 150 .desc = "Generate DH parameters with a generator value of 2 " 151 "(default)", 152 .type = OPTION_VALUE, 153 .opt.value = &dhparam_config.g, 154 .value = 2, 155 }, 156 { 157 .name = "5", 158 .desc = "Generate DH parameters with a generator value of 5", 159 .type = OPTION_VALUE, 160 .opt.value = &dhparam_config.g, 161 .value = 5, 162 }, 163 { 164 .name = "C", 165 .desc = "Convert DH parameters into C code", 166 .type = OPTION_FLAG, 167 .opt.flag = &dhparam_config.C, 168 }, 169 { 170 .name = "check", 171 .desc = "Check the DH parameters", 172 .type = OPTION_FLAG, 173 .opt.flag = &dhparam_config.check, 174 }, 175 { 176 .name = "dsaparam", 177 .desc = "Read or generate DSA parameters and convert to DH", 178 .type = OPTION_FLAG, 179 .opt.flag = &dhparam_config.dsaparam, 180 }, 181 { 182 .name = "in", 183 .argname = "file", 184 .desc = "Input file (default stdin)", 185 .type = OPTION_ARG, 186 .opt.arg = &dhparam_config.infile, 187 }, 188 { 189 .name = "inform", 190 .argname = "format", 191 .desc = "Input format (DER or PEM (default))", 192 .type = OPTION_ARG_FORMAT, 193 .opt.value = &dhparam_config.informat, 194 }, 195 { 196 .name = "noout", 197 .desc = "Do not output encoded version of DH parameters", 198 .type = OPTION_FLAG, 199 .opt.flag = &dhparam_config.noout, 200 }, 201 { 202 .name = "out", 203 .argname = "file", 204 .desc = "Output file (default stdout)", 205 .type = OPTION_ARG, 206 .opt.arg = &dhparam_config.outfile, 207 }, 208 { 209 .name = "outform", 210 .argname = "format", 211 .desc = "Output format (DER or PEM (default))", 212 .type = OPTION_ARG_FORMAT, 213 .opt.value = &dhparam_config.outformat, 214 }, 215 { 216 .name = "text", 217 .desc = "Print DH parameters in plain text", 218 .type = OPTION_FLAG, 219 .opt.flag = &dhparam_config.text, 220 }, 221 { NULL }, 222 }; 223 224 static void 225 dhparam_usage() 226 { 227 fprintf(stderr, 228 "usage: dhparam [-2 | -5] [-C] [-check] [-dsaparam]\n" 229 " [-in file] [-inform DER | PEM] [-noout] [-out file]\n" 230 " [-outform DER | PEM] [-text] [numbits]\n\n"); 231 options_usage(dhparam_options); 232 } 233 234 static int dh_cb(int p, int n, BN_GENCB *cb); 235 236 int 237 dhparam_main(int argc, char **argv) 238 { 239 BIO *in = NULL, *out = NULL; 240 BN_GENCB *cb = NULL; 241 char *num_bits = NULL; 242 DH *dh = NULL; 243 int num = 0; 244 int ret = 1; 245 int i; 246 247 if (single_execution) { 248 if (pledge("stdio cpath wpath rpath", NULL) == -1) { 249 perror("pledge"); 250 exit(1); 251 } 252 } 253 254 memset(&dhparam_config, 0, sizeof(dhparam_config)); 255 256 dhparam_config.informat = FORMAT_PEM; 257 dhparam_config.outformat = FORMAT_PEM; 258 259 if (options_parse(argc, argv, dhparam_options, &num_bits, NULL) != 0) { 260 dhparam_usage(); 261 return (1); 262 } 263 264 if (num_bits != NULL) { 265 if(sscanf(num_bits, "%d", &num) == 0 || num <= 0) { 266 BIO_printf(bio_err, "invalid number of bits: %s\n", 267 num_bits); 268 return (1); 269 } 270 } 271 272 if (dhparam_config.g && !num) 273 num = DEFBITS; 274 275 if (dhparam_config.dsaparam) { 276 if (dhparam_config.g) { 277 BIO_printf(bio_err, "generator may not be chosen for DSA parameters\n"); 278 goto end; 279 } 280 } else { 281 /* DH parameters */ 282 if (num && !dhparam_config.g) 283 dhparam_config.g = 2; 284 } 285 286 if (num) { 287 if ((cb = BN_GENCB_new()) == NULL) { 288 BIO_printf(bio_err, 289 "Error allocating BN_GENCB object\n"); 290 goto end; 291 } 292 293 BN_GENCB_set(cb, dh_cb, bio_err); 294 if (dhparam_config.dsaparam) { 295 DSA *dsa = DSA_new(); 296 297 BIO_printf(bio_err, "Generating DSA parameters, %d bit long prime\n", num); 298 if (!dsa || !DSA_generate_parameters_ex(dsa, num, 299 NULL, 0, NULL, NULL, cb)) { 300 DSA_free(dsa); 301 ERR_print_errors(bio_err); 302 goto end; 303 } 304 dh = DSA_dup_DH(dsa); 305 DSA_free(dsa); 306 if (dh == NULL) { 307 ERR_print_errors(bio_err); 308 goto end; 309 } 310 } else { 311 dh = DH_new(); 312 BIO_printf(bio_err, "Generating DH parameters, %d bit long safe prime, generator %d\n", num, dhparam_config.g); 313 BIO_printf(bio_err, "This is going to take a long time\n"); 314 if (!dh || !DH_generate_parameters_ex(dh, num, dhparam_config.g, cb)) { 315 ERR_print_errors(bio_err); 316 goto end; 317 } 318 } 319 } else { 320 321 in = BIO_new(BIO_s_file()); 322 if (in == NULL) { 323 ERR_print_errors(bio_err); 324 goto end; 325 } 326 if (dhparam_config.infile == NULL) 327 BIO_set_fp(in, stdin, BIO_NOCLOSE); 328 else { 329 if (BIO_read_filename(in, dhparam_config.infile) <= 0) { 330 perror(dhparam_config.infile); 331 goto end; 332 } 333 } 334 335 if (dhparam_config.informat != FORMAT_ASN1 && 336 dhparam_config.informat != FORMAT_PEM) { 337 BIO_printf(bio_err, "bad input format specified\n"); 338 goto end; 339 } 340 if (dhparam_config.dsaparam) { 341 DSA *dsa; 342 343 if (dhparam_config.informat == FORMAT_ASN1) 344 dsa = d2i_DSAparams_bio(in, NULL); 345 else /* informat == FORMAT_PEM */ 346 dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL); 347 348 if (dsa == NULL) { 349 BIO_printf(bio_err, "unable to load DSA parameters\n"); 350 ERR_print_errors(bio_err); 351 goto end; 352 } 353 dh = DSA_dup_DH(dsa); 354 DSA_free(dsa); 355 if (dh == NULL) { 356 ERR_print_errors(bio_err); 357 goto end; 358 } 359 } else 360 { 361 if (dhparam_config.informat == FORMAT_ASN1) 362 dh = d2i_DHparams_bio(in, NULL); 363 else /* informat == FORMAT_PEM */ 364 dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL); 365 366 if (dh == NULL) { 367 BIO_printf(bio_err, "unable to load DH parameters\n"); 368 ERR_print_errors(bio_err); 369 goto end; 370 } 371 } 372 373 /* dh != NULL */ 374 } 375 376 out = BIO_new(BIO_s_file()); 377 if (out == NULL) { 378 ERR_print_errors(bio_err); 379 goto end; 380 } 381 if (dhparam_config.outfile == NULL) { 382 BIO_set_fp(out, stdout, BIO_NOCLOSE); 383 } else { 384 if (BIO_write_filename(out, dhparam_config.outfile) <= 0) { 385 perror(dhparam_config.outfile); 386 goto end; 387 } 388 } 389 390 391 if (dhparam_config.text) { 392 DHparams_print(out, dh); 393 } 394 if (dhparam_config.check) { 395 if (!DH_check(dh, &i)) { 396 ERR_print_errors(bio_err); 397 goto end; 398 } 399 if (i & DH_CHECK_P_NOT_PRIME) 400 printf("p value is not prime\n"); 401 if (i & DH_CHECK_P_NOT_SAFE_PRIME) 402 printf("p value is not a safe prime\n"); 403 if (i & DH_UNABLE_TO_CHECK_GENERATOR) 404 printf("unable to check the generator value\n"); 405 if (i & DH_NOT_SUITABLE_GENERATOR) 406 printf("the g value is not a generator\n"); 407 if (i == 0) 408 printf("DH parameters appear to be ok.\n"); 409 } 410 if (dhparam_config.C) { 411 unsigned char *data; 412 int len, l, bits; 413 414 len = BN_num_bytes(DH_get0_p(dh)); 415 bits = BN_num_bits(DH_get0_p(dh)); 416 data = malloc(len); 417 if (data == NULL) { 418 perror("malloc"); 419 goto end; 420 } 421 printf("#ifndef HEADER_DH_H\n" 422 "#include <openssl/dh.h>\n" 423 "#endif\n"); 424 printf("DH *get_dh%d()\n\t{\n", bits); 425 426 l = BN_bn2bin(DH_get0_p(dh), data); 427 printf("\tstatic unsigned char dh%d_p[] = {", bits); 428 for (i = 0; i < l; i++) { 429 if ((i % 12) == 0) 430 printf("\n\t\t"); 431 printf("0x%02X, ", data[i]); 432 } 433 printf("\n\t\t};\n"); 434 435 l = BN_bn2bin(DH_get0_g(dh), data); 436 printf("\tstatic unsigned char dh%d_g[] = {", bits); 437 for (i = 0; i < l; i++) { 438 if ((i % 12) == 0) 439 printf("\n\t\t"); 440 printf("0x%02X, ", data[i]); 441 } 442 printf("\n\t\t};\n"); 443 444 printf("\tDH *dh;\n"); 445 printf("\tBIGNUM *p = NULL, *g = NULL;\n\n"); 446 printf("\tif ((dh = DH_new()) == NULL) return(NULL);\n"); 447 printf("\tp = BN_bin2bn(dh%d_p, sizeof(dh%d_p), NULL);\n", 448 bits, bits); 449 printf("\tg = BN_bin2bn(dh%d_g, sizeof(dh%d_g), NULL);\n", 450 bits, bits); 451 printf("\tif (p == NULL || g == NULL)\n"); 452 printf("\t\t{ BN_free(p); BN_free(g); DH_free(dh); return(NULL); }\n"); 453 printf("\tDH_set0_pqg(dh, p, NULL, g);\n"); 454 if (DH_get_length(dh) > 0) 455 printf("\tDH_set_length(dh, %ld);\n", DH_get_length(dh)); 456 printf("\treturn(dh);\n\t}\n"); 457 free(data); 458 } 459 if (!dhparam_config.noout) { 460 if (dhparam_config.outformat == FORMAT_ASN1) 461 i = i2d_DHparams_bio(out, dh); 462 else if (dhparam_config.outformat == FORMAT_PEM) 463 i = PEM_write_bio_DHparams(out, dh); 464 else { 465 BIO_printf(bio_err, "bad output format specified for outfile\n"); 466 goto end; 467 } 468 if (!i) { 469 BIO_printf(bio_err, "unable to write DH parameters\n"); 470 ERR_print_errors(bio_err); 471 goto end; 472 } 473 } 474 ret = 0; 475 476 end: 477 BIO_free(in); 478 BIO_free_all(out); 479 BN_GENCB_free(cb); 480 DH_free(dh); 481 482 return (ret); 483 } 484 485 /* dh_cb is identical to dsa_cb in apps/dsaparam.c */ 486 static int 487 dh_cb(int p, int n, BN_GENCB *cb) 488 { 489 char c = '*'; 490 491 if (p == 0) 492 c = '.'; 493 if (p == 1) 494 c = '+'; 495 if (p == 2) 496 c = '*'; 497 if (p == 3) 498 c = '\n'; 499 BIO_write(BN_GENCB_get_arg(cb), &c, 1); 500 (void) BIO_flush(BN_GENCB_get_arg(cb)); 501 return 1; 502 } 503 504 #endif 505