1 /* $OpenBSD: dh_lib.c,v 1.39 2023/07/08 15:29:03 beck 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 *ret; 126 127 ret = malloc(sizeof(DH)); 128 if (ret == NULL) { 129 DHerror(ERR_R_MALLOC_FAILURE); 130 return NULL; 131 } 132 133 ret->meth = DH_get_default_method(); 134 #ifndef OPENSSL_NO_ENGINE 135 if (engine) { 136 if (!ENGINE_init(engine)) { 137 DHerror(ERR_R_ENGINE_LIB); 138 free(ret); 139 return NULL; 140 } 141 ret->engine = engine; 142 } else 143 ret->engine = ENGINE_get_default_DH(); 144 if(ret->engine) { 145 ret->meth = ENGINE_get_DH(ret->engine); 146 if (ret->meth == NULL) { 147 DHerror(ERR_R_ENGINE_LIB); 148 ENGINE_finish(ret->engine); 149 free(ret); 150 return NULL; 151 } 152 } 153 #endif 154 155 ret->pad = 0; 156 ret->version = 0; 157 ret->p = NULL; 158 ret->g = NULL; 159 ret->length = 0; 160 ret->pub_key = NULL; 161 ret->priv_key = NULL; 162 ret->q = NULL; 163 ret->j = NULL; 164 ret->seed = NULL; 165 ret->seedlen = 0; 166 ret->counter = NULL; 167 ret->method_mont_p=NULL; 168 ret->references = 1; 169 ret->flags = ret->meth->flags & ~DH_FLAG_NON_FIPS_ALLOW; 170 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data); 171 if (ret->meth->init != NULL && !ret->meth->init(ret)) { 172 #ifndef OPENSSL_NO_ENGINE 173 ENGINE_finish(ret->engine); 174 #endif 175 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data); 176 free(ret); 177 ret = NULL; 178 } 179 return ret; 180 } 181 LCRYPTO_ALIAS(DH_new_method); 182 183 void 184 DH_free(DH *r) 185 { 186 int i; 187 188 if (r == NULL) 189 return; 190 i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DH); 191 if (i > 0) 192 return; 193 194 if (r->meth->finish) 195 r->meth->finish(r); 196 #ifndef OPENSSL_NO_ENGINE 197 ENGINE_finish(r->engine); 198 #endif 199 200 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, r, &r->ex_data); 201 202 BN_free(r->p); 203 BN_free(r->g); 204 BN_free(r->q); 205 BN_free(r->j); 206 free(r->seed); 207 BN_free(r->counter); 208 BN_free(r->pub_key); 209 BN_free(r->priv_key); 210 free(r); 211 } 212 LCRYPTO_ALIAS(DH_free); 213 214 int 215 DH_up_ref(DH *r) 216 { 217 int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DH); 218 219 return i > 1 ? 1 : 0; 220 } 221 LCRYPTO_ALIAS(DH_up_ref); 222 223 int 224 DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 225 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 226 { 227 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DH, argl, argp, new_func, 228 dup_func, free_func); 229 } 230 LCRYPTO_ALIAS(DH_get_ex_new_index); 231 232 int 233 DH_set_ex_data(DH *d, int idx, void *arg) 234 { 235 return CRYPTO_set_ex_data(&d->ex_data, idx, arg); 236 } 237 LCRYPTO_ALIAS(DH_set_ex_data); 238 239 void * 240 DH_get_ex_data(DH *d, int idx) 241 { 242 return CRYPTO_get_ex_data(&d->ex_data, idx); 243 } 244 LCRYPTO_ALIAS(DH_get_ex_data); 245 246 int 247 DH_size(const DH *dh) 248 { 249 return BN_num_bytes(dh->p); 250 } 251 LCRYPTO_ALIAS(DH_size); 252 253 int 254 DH_bits(const DH *dh) 255 { 256 return BN_num_bits(dh->p); 257 } 258 LCRYPTO_ALIAS(DH_bits); 259 260 int 261 DH_security_bits(const DH *dh) 262 { 263 int N = -1; 264 265 if (dh->q != NULL) 266 N = BN_num_bits(dh->q); 267 else if (dh->length > 0) 268 N = dh->length; 269 270 return BN_security_bits(BN_num_bits(dh->p), N); 271 } 272 LCRYPTO_ALIAS(DH_security_bits); 273 274 ENGINE * 275 DH_get0_engine(DH *dh) 276 { 277 return dh->engine; 278 } 279 LCRYPTO_ALIAS(DH_get0_engine); 280 281 void 282 DH_get0_pqg(const DH *dh, const BIGNUM **p, const BIGNUM **q, const BIGNUM **g) 283 { 284 if (p != NULL) 285 *p = dh->p; 286 if (q != NULL) 287 *q = dh->q; 288 if (g != NULL) 289 *g = dh->g; 290 } 291 LCRYPTO_ALIAS(DH_get0_pqg); 292 293 int 294 DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g) 295 { 296 if ((dh->p == NULL && p == NULL) || (dh->g == NULL && g == NULL)) 297 return 0; 298 299 if (p != NULL) { 300 BN_free(dh->p); 301 dh->p = p; 302 } 303 if (q != NULL) { 304 BN_free(dh->q); 305 dh->q = q; 306 dh->length = BN_num_bits(dh->q); 307 } 308 if (g != NULL) { 309 BN_free(dh->g); 310 dh->g = g; 311 } 312 313 return 1; 314 } 315 LCRYPTO_ALIAS(DH_set0_pqg); 316 317 void 318 DH_get0_key(const DH *dh, const BIGNUM **pub_key, const BIGNUM **priv_key) 319 { 320 if (pub_key != NULL) 321 *pub_key = dh->pub_key; 322 if (priv_key != NULL) 323 *priv_key = dh->priv_key; 324 } 325 LCRYPTO_ALIAS(DH_get0_key); 326 327 int 328 DH_set0_key(DH *dh, BIGNUM *pub_key, BIGNUM *priv_key) 329 { 330 if (pub_key != NULL) { 331 BN_free(dh->pub_key); 332 dh->pub_key = pub_key; 333 } 334 if (priv_key != NULL) { 335 BN_free(dh->priv_key); 336 dh->priv_key = priv_key; 337 } 338 339 return 1; 340 } 341 LCRYPTO_ALIAS(DH_set0_key); 342 343 const BIGNUM * 344 DH_get0_p(const DH *dh) 345 { 346 return dh->p; 347 } 348 LCRYPTO_ALIAS(DH_get0_p); 349 350 const BIGNUM * 351 DH_get0_q(const DH *dh) 352 { 353 return dh->q; 354 } 355 LCRYPTO_ALIAS(DH_get0_q); 356 357 const BIGNUM * 358 DH_get0_g(const DH *dh) 359 { 360 return dh->g; 361 } 362 LCRYPTO_ALIAS(DH_get0_g); 363 364 const BIGNUM * 365 DH_get0_priv_key(const DH *dh) 366 { 367 return dh->priv_key; 368 } 369 LCRYPTO_ALIAS(DH_get0_priv_key); 370 371 const BIGNUM * 372 DH_get0_pub_key(const DH *dh) 373 { 374 return dh->pub_key; 375 } 376 LCRYPTO_ALIAS(DH_get0_pub_key); 377 378 void 379 DH_clear_flags(DH *dh, int flags) 380 { 381 dh->flags &= ~flags; 382 } 383 LCRYPTO_ALIAS(DH_clear_flags); 384 385 int 386 DH_test_flags(const DH *dh, int flags) 387 { 388 return dh->flags & flags; 389 } 390 LCRYPTO_ALIAS(DH_test_flags); 391 392 void 393 DH_set_flags(DH *dh, int flags) 394 { 395 dh->flags |= flags; 396 } 397 LCRYPTO_ALIAS(DH_set_flags); 398 399 long 400 DH_get_length(const DH *dh) 401 { 402 return dh->length; 403 } 404 LCRYPTO_ALIAS(DH_get_length); 405 406 int 407 DH_set_length(DH *dh, long length) 408 { 409 if (length < 0 || length > INT_MAX) 410 return 0; 411 412 dh->length = length; 413 return 1; 414 } 415 LCRYPTO_ALIAS(DH_set_length); 416