1 /* 2 * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the OpenSSL license (the "License"). You may not use 5 * this file except in compliance with the License. You can obtain a copy 6 * in the file LICENSE in the source distribution or at 7 * https://www.openssl.org/source/license.html 8 */ 9 10 #include <openssl/opensslconf.h> 11 #ifdef OPENSSL_NO_DH 12 NON_EMPTY_TRANSLATION_UNIT 13 #else 14 15 # include <stdio.h> 16 # include <stdlib.h> 17 # include <time.h> 18 # include <string.h> 19 # include "apps.h" 20 # include "progs.h" 21 # include <openssl/bio.h> 22 # include <openssl/err.h> 23 # include <openssl/bn.h> 24 # include <openssl/dh.h> 25 # include <openssl/x509.h> 26 # include <openssl/pem.h> 27 28 # ifndef OPENSSL_NO_DSA 29 # include <openssl/dsa.h> 30 # endif 31 32 # define DEFBITS 2048 33 34 static int dh_cb(int p, int n, BN_GENCB *cb); 35 36 typedef enum OPTION_choice { 37 OPT_ERR = -1, OPT_EOF = 0, OPT_HELP, 38 OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT, 39 OPT_ENGINE, OPT_CHECK, OPT_TEXT, OPT_NOOUT, 40 OPT_DSAPARAM, OPT_C, OPT_2, OPT_5, 41 OPT_R_ENUM 42 } OPTION_CHOICE; 43 44 const OPTIONS dhparam_options[] = { 45 {OPT_HELP_STR, 1, '-', "Usage: %s [flags] [numbits]\n"}, 46 {OPT_HELP_STR, 1, '-', "Valid options are:\n"}, 47 {"help", OPT_HELP, '-', "Display this summary"}, 48 {"in", OPT_IN, '<', "Input file"}, 49 {"inform", OPT_INFORM, 'F', "Input format, DER or PEM"}, 50 {"outform", OPT_OUTFORM, 'F', "Output format, DER or PEM"}, 51 {"out", OPT_OUT, '>', "Output file"}, 52 {"check", OPT_CHECK, '-', "Check the DH parameters"}, 53 {"text", OPT_TEXT, '-', "Print a text form of the DH parameters"}, 54 {"noout", OPT_NOOUT, '-', "Don't output any DH parameters"}, 55 OPT_R_OPTIONS, 56 {"C", OPT_C, '-', "Print C code"}, 57 {"2", OPT_2, '-', "Generate parameters using 2 as the generator value"}, 58 {"5", OPT_5, '-', "Generate parameters using 5 as the generator value"}, 59 # ifndef OPENSSL_NO_DSA 60 {"dsaparam", OPT_DSAPARAM, '-', 61 "Read or generate DSA parameters, convert to DH"}, 62 # endif 63 # ifndef OPENSSL_NO_ENGINE 64 {"engine", OPT_ENGINE, 's', "Use engine e, possibly a hardware device"}, 65 # endif 66 {NULL} 67 }; 68 69 int dhparam_main(int argc, char **argv) 70 { 71 BIO *in = NULL, *out = NULL; 72 DH *dh = NULL; 73 char *infile = NULL, *outfile = NULL, *prog; 74 ENGINE *e = NULL; 75 #ifndef OPENSSL_NO_DSA 76 int dsaparam = 0; 77 #endif 78 int i, text = 0, C = 0, ret = 1, num = 0, g = 0; 79 int informat = FORMAT_PEM, outformat = FORMAT_PEM, check = 0, noout = 0; 80 OPTION_CHOICE o; 81 82 prog = opt_init(argc, argv, dhparam_options); 83 while ((o = opt_next()) != OPT_EOF) { 84 switch (o) { 85 case OPT_EOF: 86 case OPT_ERR: 87 opthelp: 88 BIO_printf(bio_err, "%s: Use -help for summary.\n", prog); 89 goto end; 90 case OPT_HELP: 91 opt_help(dhparam_options); 92 ret = 0; 93 goto end; 94 case OPT_INFORM: 95 if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat)) 96 goto opthelp; 97 break; 98 case OPT_OUTFORM: 99 if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat)) 100 goto opthelp; 101 break; 102 case OPT_IN: 103 infile = opt_arg(); 104 break; 105 case OPT_OUT: 106 outfile = opt_arg(); 107 break; 108 case OPT_ENGINE: 109 e = setup_engine(opt_arg(), 0); 110 break; 111 case OPT_CHECK: 112 check = 1; 113 break; 114 case OPT_TEXT: 115 text = 1; 116 break; 117 case OPT_DSAPARAM: 118 #ifndef OPENSSL_NO_DSA 119 dsaparam = 1; 120 #endif 121 break; 122 case OPT_C: 123 C = 1; 124 break; 125 case OPT_2: 126 g = 2; 127 break; 128 case OPT_5: 129 g = 5; 130 break; 131 case OPT_NOOUT: 132 noout = 1; 133 break; 134 case OPT_R_CASES: 135 if (!opt_rand(o)) 136 goto end; 137 break; 138 } 139 } 140 argc = opt_num_rest(); 141 argv = opt_rest(); 142 143 if (argv[0] != NULL && (!opt_int(argv[0], &num) || num <= 0)) 144 goto end; 145 146 if (g && !num) 147 num = DEFBITS; 148 149 # ifndef OPENSSL_NO_DSA 150 if (dsaparam && g) { 151 BIO_printf(bio_err, 152 "generator may not be chosen for DSA parameters\n"); 153 goto end; 154 } 155 # endif 156 157 out = bio_open_default(outfile, 'w', outformat); 158 if (out == NULL) 159 goto end; 160 161 /* DH parameters */ 162 if (num && !g) 163 g = 2; 164 165 if (num) { 166 167 BN_GENCB *cb; 168 cb = BN_GENCB_new(); 169 if (cb == NULL) { 170 ERR_print_errors(bio_err); 171 goto end; 172 } 173 174 BN_GENCB_set(cb, dh_cb, bio_err); 175 176 # ifndef OPENSSL_NO_DSA 177 if (dsaparam) { 178 DSA *dsa = DSA_new(); 179 180 BIO_printf(bio_err, 181 "Generating DSA parameters, %d bit long prime\n", num); 182 if (dsa == NULL 183 || !DSA_generate_parameters_ex(dsa, num, NULL, 0, NULL, NULL, 184 cb)) { 185 DSA_free(dsa); 186 BN_GENCB_free(cb); 187 ERR_print_errors(bio_err); 188 goto end; 189 } 190 191 dh = DSA_dup_DH(dsa); 192 DSA_free(dsa); 193 if (dh == NULL) { 194 BN_GENCB_free(cb); 195 ERR_print_errors(bio_err); 196 goto end; 197 } 198 } else 199 # endif 200 { 201 dh = DH_new(); 202 BIO_printf(bio_err, 203 "Generating DH parameters, %d bit long safe prime, generator %d\n", 204 num, g); 205 BIO_printf(bio_err, "This is going to take a long time\n"); 206 if (dh == NULL || !DH_generate_parameters_ex(dh, num, g, cb)) { 207 BN_GENCB_free(cb); 208 ERR_print_errors(bio_err); 209 goto end; 210 } 211 } 212 213 BN_GENCB_free(cb); 214 } else { 215 216 in = bio_open_default(infile, 'r', informat); 217 if (in == NULL) 218 goto end; 219 220 # ifndef OPENSSL_NO_DSA 221 if (dsaparam) { 222 DSA *dsa; 223 224 if (informat == FORMAT_ASN1) 225 dsa = d2i_DSAparams_bio(in, NULL); 226 else /* informat == FORMAT_PEM */ 227 dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL); 228 229 if (dsa == NULL) { 230 BIO_printf(bio_err, "unable to load DSA parameters\n"); 231 ERR_print_errors(bio_err); 232 goto end; 233 } 234 235 dh = DSA_dup_DH(dsa); 236 DSA_free(dsa); 237 if (dh == NULL) { 238 ERR_print_errors(bio_err); 239 goto end; 240 } 241 } else 242 # endif 243 { 244 if (informat == FORMAT_ASN1) { 245 /* 246 * We have no PEM header to determine what type of DH params it 247 * is. We'll just try both. 248 */ 249 dh = d2i_DHparams_bio(in, NULL); 250 /* BIO_reset() returns 0 for success for file BIOs only!!! */ 251 if (dh == NULL && BIO_reset(in) == 0) 252 dh = d2i_DHxparams_bio(in, NULL); 253 } else { 254 /* informat == FORMAT_PEM */ 255 dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL); 256 } 257 258 if (dh == NULL) { 259 BIO_printf(bio_err, "unable to load DH parameters\n"); 260 ERR_print_errors(bio_err); 261 goto end; 262 } 263 } 264 265 /* dh != NULL */ 266 } 267 268 if (text) { 269 DHparams_print(out, dh); 270 } 271 272 if (check) { 273 if (!DH_check(dh, &i)) { 274 ERR_print_errors(bio_err); 275 goto end; 276 } 277 if (i & DH_CHECK_P_NOT_PRIME) 278 BIO_printf(bio_err, "WARNING: p value is not prime\n"); 279 if (i & DH_CHECK_P_NOT_SAFE_PRIME) 280 BIO_printf(bio_err, "WARNING: p value is not a safe prime\n"); 281 if (i & DH_CHECK_Q_NOT_PRIME) 282 BIO_printf(bio_err, "WARNING: q value is not a prime\n"); 283 if (i & DH_CHECK_INVALID_Q_VALUE) 284 BIO_printf(bio_err, "WARNING: q value is invalid\n"); 285 if (i & DH_CHECK_INVALID_J_VALUE) 286 BIO_printf(bio_err, "WARNING: j value is invalid\n"); 287 if (i & DH_UNABLE_TO_CHECK_GENERATOR) 288 BIO_printf(bio_err, 289 "WARNING: unable to check the generator value\n"); 290 if (i & DH_NOT_SUITABLE_GENERATOR) 291 BIO_printf(bio_err, "WARNING: the g value is not a generator\n"); 292 if (i == 0) 293 BIO_printf(bio_err, "DH parameters appear to be ok.\n"); 294 if (num != 0 && i != 0) { 295 /* 296 * We have generated parameters but DH_check() indicates they are 297 * invalid! This should never happen! 298 */ 299 BIO_printf(bio_err, "ERROR: Invalid parameters generated\n"); 300 goto end; 301 } 302 } 303 if (C) { 304 unsigned char *data; 305 int len, bits; 306 const BIGNUM *pbn, *gbn; 307 308 len = DH_size(dh); 309 bits = DH_bits(dh); 310 DH_get0_pqg(dh, &pbn, NULL, &gbn); 311 data = app_malloc(len, "print a BN"); 312 313 BIO_printf(out, "static DH *get_dh%d(void)\n{\n", bits); 314 print_bignum_var(out, pbn, "dhp", bits, data); 315 print_bignum_var(out, gbn, "dhg", bits, data); 316 BIO_printf(out, " DH *dh = DH_new();\n" 317 " BIGNUM *p, *g;\n" 318 "\n" 319 " if (dh == NULL)\n" 320 " return NULL;\n"); 321 BIO_printf(out, " p = BN_bin2bn(dhp_%d, sizeof(dhp_%d), NULL);\n", 322 bits, bits); 323 BIO_printf(out, " g = BN_bin2bn(dhg_%d, sizeof(dhg_%d), NULL);\n", 324 bits, bits); 325 BIO_printf(out, " if (p == NULL || g == NULL\n" 326 " || !DH_set0_pqg(dh, p, NULL, g)) {\n" 327 " DH_free(dh);\n" 328 " BN_free(p);\n" 329 " BN_free(g);\n" 330 " return NULL;\n" 331 " }\n"); 332 if (DH_get_length(dh) > 0) 333 BIO_printf(out, 334 " if (!DH_set_length(dh, %ld)) {\n" 335 " DH_free(dh);\n" 336 " return NULL;\n" 337 " }\n", DH_get_length(dh)); 338 BIO_printf(out, " return dh;\n}\n"); 339 OPENSSL_free(data); 340 } 341 342 if (!noout) { 343 const BIGNUM *q; 344 DH_get0_pqg(dh, NULL, &q, NULL); 345 if (outformat == FORMAT_ASN1) { 346 if (q != NULL) 347 i = i2d_DHxparams_bio(out, dh); 348 else 349 i = i2d_DHparams_bio(out, dh); 350 } else if (q != NULL) { 351 i = PEM_write_bio_DHxparams(out, dh); 352 } else { 353 i = PEM_write_bio_DHparams(out, dh); 354 } 355 if (!i) { 356 BIO_printf(bio_err, "unable to write DH parameters\n"); 357 ERR_print_errors(bio_err); 358 goto end; 359 } 360 } 361 ret = 0; 362 end: 363 BIO_free(in); 364 BIO_free_all(out); 365 DH_free(dh); 366 release_engine(e); 367 return ret; 368 } 369 370 static int dh_cb(int p, int n, BN_GENCB *cb) 371 { 372 static const char symbols[] = ".+*\n"; 373 char c = (p >= 0 && (size_t)p < sizeof(symbols) - 1) ? symbols[p] : '?'; 374 375 BIO_write(BN_GENCB_get_arg(cb), &c, 1); 376 (void)BIO_flush(BN_GENCB_get_arg(cb)); 377 return 1; 378 } 379 #endif 380