1 /* $OpenBSD: dh_lib.c,v 1.41 2023/08/13 12:09:14 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 if (dh->meth->init != NULL && !dh->meth->init(dh)) 157 goto err; 158 159 return dh; 160 161 err: 162 DH_free(dh); 163 164 return NULL; 165 } 166 LCRYPTO_ALIAS(DH_new_method); 167 168 void 169 DH_free(DH *r) 170 { 171 int i; 172 173 if (r == NULL) 174 return; 175 i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DH); 176 if (i > 0) 177 return; 178 179 if (r->meth != NULL && r->meth->finish != NULL) 180 r->meth->finish(r); 181 #ifndef OPENSSL_NO_ENGINE 182 ENGINE_finish(r->engine); 183 #endif 184 185 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, r, &r->ex_data); 186 187 BN_free(r->p); 188 BN_free(r->g); 189 BN_free(r->q); 190 BN_free(r->j); 191 free(r->seed); 192 BN_free(r->counter); 193 BN_free(r->pub_key); 194 BN_free(r->priv_key); 195 free(r); 196 } 197 LCRYPTO_ALIAS(DH_free); 198 199 int 200 DH_up_ref(DH *r) 201 { 202 int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DH); 203 204 return i > 1 ? 1 : 0; 205 } 206 LCRYPTO_ALIAS(DH_up_ref); 207 208 int 209 DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 210 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 211 { 212 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DH, argl, argp, new_func, 213 dup_func, free_func); 214 } 215 LCRYPTO_ALIAS(DH_get_ex_new_index); 216 217 int 218 DH_set_ex_data(DH *d, int idx, void *arg) 219 { 220 return CRYPTO_set_ex_data(&d->ex_data, idx, arg); 221 } 222 LCRYPTO_ALIAS(DH_set_ex_data); 223 224 void * 225 DH_get_ex_data(DH *d, int idx) 226 { 227 return CRYPTO_get_ex_data(&d->ex_data, idx); 228 } 229 LCRYPTO_ALIAS(DH_get_ex_data); 230 231 int 232 DH_size(const DH *dh) 233 { 234 return BN_num_bytes(dh->p); 235 } 236 LCRYPTO_ALIAS(DH_size); 237 238 int 239 DH_bits(const DH *dh) 240 { 241 return BN_num_bits(dh->p); 242 } 243 LCRYPTO_ALIAS(DH_bits); 244 245 int 246 DH_security_bits(const DH *dh) 247 { 248 int N = -1; 249 250 if (dh->q != NULL) 251 N = BN_num_bits(dh->q); 252 else if (dh->length > 0) 253 N = dh->length; 254 255 return BN_security_bits(BN_num_bits(dh->p), N); 256 } 257 LCRYPTO_ALIAS(DH_security_bits); 258 259 ENGINE * 260 DH_get0_engine(DH *dh) 261 { 262 return dh->engine; 263 } 264 LCRYPTO_ALIAS(DH_get0_engine); 265 266 void 267 DH_get0_pqg(const DH *dh, const BIGNUM **p, const BIGNUM **q, const BIGNUM **g) 268 { 269 if (p != NULL) 270 *p = dh->p; 271 if (q != NULL) 272 *q = dh->q; 273 if (g != NULL) 274 *g = dh->g; 275 } 276 LCRYPTO_ALIAS(DH_get0_pqg); 277 278 int 279 DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g) 280 { 281 if ((dh->p == NULL && p == NULL) || (dh->g == NULL && g == NULL)) 282 return 0; 283 284 if (p != NULL) { 285 BN_free(dh->p); 286 dh->p = p; 287 } 288 if (q != NULL) { 289 BN_free(dh->q); 290 dh->q = q; 291 dh->length = BN_num_bits(dh->q); 292 } 293 if (g != NULL) { 294 BN_free(dh->g); 295 dh->g = g; 296 } 297 298 return 1; 299 } 300 LCRYPTO_ALIAS(DH_set0_pqg); 301 302 void 303 DH_get0_key(const DH *dh, const BIGNUM **pub_key, const BIGNUM **priv_key) 304 { 305 if (pub_key != NULL) 306 *pub_key = dh->pub_key; 307 if (priv_key != NULL) 308 *priv_key = dh->priv_key; 309 } 310 LCRYPTO_ALIAS(DH_get0_key); 311 312 int 313 DH_set0_key(DH *dh, BIGNUM *pub_key, BIGNUM *priv_key) 314 { 315 if (pub_key != NULL) { 316 BN_free(dh->pub_key); 317 dh->pub_key = pub_key; 318 } 319 if (priv_key != NULL) { 320 BN_free(dh->priv_key); 321 dh->priv_key = priv_key; 322 } 323 324 return 1; 325 } 326 LCRYPTO_ALIAS(DH_set0_key); 327 328 const BIGNUM * 329 DH_get0_p(const DH *dh) 330 { 331 return dh->p; 332 } 333 LCRYPTO_ALIAS(DH_get0_p); 334 335 const BIGNUM * 336 DH_get0_q(const DH *dh) 337 { 338 return dh->q; 339 } 340 LCRYPTO_ALIAS(DH_get0_q); 341 342 const BIGNUM * 343 DH_get0_g(const DH *dh) 344 { 345 return dh->g; 346 } 347 LCRYPTO_ALIAS(DH_get0_g); 348 349 const BIGNUM * 350 DH_get0_priv_key(const DH *dh) 351 { 352 return dh->priv_key; 353 } 354 LCRYPTO_ALIAS(DH_get0_priv_key); 355 356 const BIGNUM * 357 DH_get0_pub_key(const DH *dh) 358 { 359 return dh->pub_key; 360 } 361 LCRYPTO_ALIAS(DH_get0_pub_key); 362 363 void 364 DH_clear_flags(DH *dh, int flags) 365 { 366 dh->flags &= ~flags; 367 } 368 LCRYPTO_ALIAS(DH_clear_flags); 369 370 int 371 DH_test_flags(const DH *dh, int flags) 372 { 373 return dh->flags & flags; 374 } 375 LCRYPTO_ALIAS(DH_test_flags); 376 377 void 378 DH_set_flags(DH *dh, int flags) 379 { 380 dh->flags |= flags; 381 } 382 LCRYPTO_ALIAS(DH_set_flags); 383 384 long 385 DH_get_length(const DH *dh) 386 { 387 return dh->length; 388 } 389 LCRYPTO_ALIAS(DH_get_length); 390 391 int 392 DH_set_length(DH *dh, long length) 393 { 394 if (length < 0 || length > INT_MAX) 395 return 0; 396 397 dh->length = length; 398 return 1; 399 } 400 LCRYPTO_ALIAS(DH_set_length); 401