1 /* $OpenBSD: dh_lib.c,v 1.40 2023/08/12 06:14:36 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 <limits.h> 60 #include <stdio.h> 61 62 #include <openssl/opensslconf.h> 63 64 #include <openssl/bn.h> 65 #include <openssl/dh.h> 66 #include <openssl/err.h> 67 68 #ifndef OPENSSL_NO_ENGINE 69 #include <openssl/engine.h> 70 #endif 71 72 #include "dh_local.h" 73 74 static const DH_METHOD *default_DH_method = NULL; 75 76 void 77 DH_set_default_method(const DH_METHOD *meth) 78 { 79 default_DH_method = meth; 80 } 81 LCRYPTO_ALIAS(DH_set_default_method); 82 83 const DH_METHOD * 84 DH_get_default_method(void) 85 { 86 if (!default_DH_method) 87 default_DH_method = DH_OpenSSL(); 88 return default_DH_method; 89 } 90 LCRYPTO_ALIAS(DH_get_default_method); 91 92 int 93 DH_set_method(DH *dh, const DH_METHOD *meth) 94 { 95 /* 96 * NB: The caller is specifically setting a method, so it's not up to us 97 * to deal with which ENGINE it comes from. 98 */ 99 const DH_METHOD *mtmp; 100 101 mtmp = dh->meth; 102 if (mtmp->finish) 103 mtmp->finish(dh); 104 #ifndef OPENSSL_NO_ENGINE 105 ENGINE_finish(dh->engine); 106 dh->engine = NULL; 107 #endif 108 dh->meth = meth; 109 if (meth->init) 110 meth->init(dh); 111 return 1; 112 } 113 LCRYPTO_ALIAS(DH_set_method); 114 115 DH * 116 DH_new(void) 117 { 118 return DH_new_method(NULL); 119 } 120 LCRYPTO_ALIAS(DH_new); 121 122 DH * 123 DH_new_method(ENGINE *engine) 124 { 125 DH *dh; 126 127 if ((dh = calloc(1, sizeof(*dh))) == NULL) { 128 DHerror(ERR_R_MALLOC_FAILURE); 129 goto err; 130 } 131 132 dh->meth = DH_get_default_method(); 133 dh->flags = dh->meth->flags & ~DH_FLAG_NON_FIPS_ALLOW; 134 dh->references = 1; 135 136 #ifndef OPENSSL_NO_ENGINE 137 if (engine != NULL) { 138 if (!ENGINE_init(engine)) { 139 DHerror(ERR_R_ENGINE_LIB); 140 goto err; 141 } 142 dh->engine = engine; 143 } else 144 dh->engine = ENGINE_get_default_DH(); 145 if (dh->engine != NULL) { 146 if ((dh->meth = ENGINE_get_DH(dh->engine)) == NULL) { 147 DHerror(ERR_R_ENGINE_LIB); 148 goto err; 149 } 150 dh->flags = dh->meth->flags & ~DH_FLAG_NON_FIPS_ALLOW; 151 } 152 #endif 153 154 if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DH, dh, &dh->ex_data)) 155 goto err; 156 157 if (dh->meth->init != NULL && !dh->meth->init(dh)) 158 goto err; 159 160 return dh; 161 162 err: 163 DH_free(dh); 164 165 return NULL; 166 } 167 LCRYPTO_ALIAS(DH_new_method); 168 169 void 170 DH_free(DH *r) 171 { 172 int i; 173 174 if (r == NULL) 175 return; 176 i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DH); 177 if (i > 0) 178 return; 179 180 if (r->meth != NULL && r->meth->finish != NULL) 181 r->meth->finish(r); 182 #ifndef OPENSSL_NO_ENGINE 183 ENGINE_finish(r->engine); 184 #endif 185 186 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, r, &r->ex_data); 187 188 BN_free(r->p); 189 BN_free(r->g); 190 BN_free(r->q); 191 BN_free(r->j); 192 free(r->seed); 193 BN_free(r->counter); 194 BN_free(r->pub_key); 195 BN_free(r->priv_key); 196 free(r); 197 } 198 LCRYPTO_ALIAS(DH_free); 199 200 int 201 DH_up_ref(DH *r) 202 { 203 int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DH); 204 205 return i > 1 ? 1 : 0; 206 } 207 LCRYPTO_ALIAS(DH_up_ref); 208 209 int 210 DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 211 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 212 { 213 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DH, argl, argp, new_func, 214 dup_func, free_func); 215 } 216 LCRYPTO_ALIAS(DH_get_ex_new_index); 217 218 int 219 DH_set_ex_data(DH *d, int idx, void *arg) 220 { 221 return CRYPTO_set_ex_data(&d->ex_data, idx, arg); 222 } 223 LCRYPTO_ALIAS(DH_set_ex_data); 224 225 void * 226 DH_get_ex_data(DH *d, int idx) 227 { 228 return CRYPTO_get_ex_data(&d->ex_data, idx); 229 } 230 LCRYPTO_ALIAS(DH_get_ex_data); 231 232 int 233 DH_size(const DH *dh) 234 { 235 return BN_num_bytes(dh->p); 236 } 237 LCRYPTO_ALIAS(DH_size); 238 239 int 240 DH_bits(const DH *dh) 241 { 242 return BN_num_bits(dh->p); 243 } 244 LCRYPTO_ALIAS(DH_bits); 245 246 int 247 DH_security_bits(const DH *dh) 248 { 249 int N = -1; 250 251 if (dh->q != NULL) 252 N = BN_num_bits(dh->q); 253 else if (dh->length > 0) 254 N = dh->length; 255 256 return BN_security_bits(BN_num_bits(dh->p), N); 257 } 258 LCRYPTO_ALIAS(DH_security_bits); 259 260 ENGINE * 261 DH_get0_engine(DH *dh) 262 { 263 return dh->engine; 264 } 265 LCRYPTO_ALIAS(DH_get0_engine); 266 267 void 268 DH_get0_pqg(const DH *dh, const BIGNUM **p, const BIGNUM **q, const BIGNUM **g) 269 { 270 if (p != NULL) 271 *p = dh->p; 272 if (q != NULL) 273 *q = dh->q; 274 if (g != NULL) 275 *g = dh->g; 276 } 277 LCRYPTO_ALIAS(DH_get0_pqg); 278 279 int 280 DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g) 281 { 282 if ((dh->p == NULL && p == NULL) || (dh->g == NULL && g == NULL)) 283 return 0; 284 285 if (p != NULL) { 286 BN_free(dh->p); 287 dh->p = p; 288 } 289 if (q != NULL) { 290 BN_free(dh->q); 291 dh->q = q; 292 dh->length = BN_num_bits(dh->q); 293 } 294 if (g != NULL) { 295 BN_free(dh->g); 296 dh->g = g; 297 } 298 299 return 1; 300 } 301 LCRYPTO_ALIAS(DH_set0_pqg); 302 303 void 304 DH_get0_key(const DH *dh, const BIGNUM **pub_key, const BIGNUM **priv_key) 305 { 306 if (pub_key != NULL) 307 *pub_key = dh->pub_key; 308 if (priv_key != NULL) 309 *priv_key = dh->priv_key; 310 } 311 LCRYPTO_ALIAS(DH_get0_key); 312 313 int 314 DH_set0_key(DH *dh, BIGNUM *pub_key, BIGNUM *priv_key) 315 { 316 if (pub_key != NULL) { 317 BN_free(dh->pub_key); 318 dh->pub_key = pub_key; 319 } 320 if (priv_key != NULL) { 321 BN_free(dh->priv_key); 322 dh->priv_key = priv_key; 323 } 324 325 return 1; 326 } 327 LCRYPTO_ALIAS(DH_set0_key); 328 329 const BIGNUM * 330 DH_get0_p(const DH *dh) 331 { 332 return dh->p; 333 } 334 LCRYPTO_ALIAS(DH_get0_p); 335 336 const BIGNUM * 337 DH_get0_q(const DH *dh) 338 { 339 return dh->q; 340 } 341 LCRYPTO_ALIAS(DH_get0_q); 342 343 const BIGNUM * 344 DH_get0_g(const DH *dh) 345 { 346 return dh->g; 347 } 348 LCRYPTO_ALIAS(DH_get0_g); 349 350 const BIGNUM * 351 DH_get0_priv_key(const DH *dh) 352 { 353 return dh->priv_key; 354 } 355 LCRYPTO_ALIAS(DH_get0_priv_key); 356 357 const BIGNUM * 358 DH_get0_pub_key(const DH *dh) 359 { 360 return dh->pub_key; 361 } 362 LCRYPTO_ALIAS(DH_get0_pub_key); 363 364 void 365 DH_clear_flags(DH *dh, int flags) 366 { 367 dh->flags &= ~flags; 368 } 369 LCRYPTO_ALIAS(DH_clear_flags); 370 371 int 372 DH_test_flags(const DH *dh, int flags) 373 { 374 return dh->flags & flags; 375 } 376 LCRYPTO_ALIAS(DH_test_flags); 377 378 void 379 DH_set_flags(DH *dh, int flags) 380 { 381 dh->flags |= flags; 382 } 383 LCRYPTO_ALIAS(DH_set_flags); 384 385 long 386 DH_get_length(const DH *dh) 387 { 388 return dh->length; 389 } 390 LCRYPTO_ALIAS(DH_get_length); 391 392 int 393 DH_set_length(DH *dh, long length) 394 { 395 if (length < 0 || length > INT_MAX) 396 return 0; 397 398 dh->length = length; 399 return 1; 400 } 401 LCRYPTO_ALIAS(DH_set_length); 402