1 /* $OpenBSD: dh_lib.c,v 1.43 2023/11/29 21:35:57 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 #include "dh_local.h" 69 70 static const DH_METHOD *default_DH_method = NULL; 71 72 void 73 DH_set_default_method(const DH_METHOD *meth) 74 { 75 default_DH_method = meth; 76 } 77 LCRYPTO_ALIAS(DH_set_default_method); 78 79 const DH_METHOD * 80 DH_get_default_method(void) 81 { 82 if (!default_DH_method) 83 default_DH_method = DH_OpenSSL(); 84 return default_DH_method; 85 } 86 LCRYPTO_ALIAS(DH_get_default_method); 87 88 int 89 DH_set_method(DH *dh, const DH_METHOD *meth) 90 { 91 /* 92 * NB: The caller is specifically setting a method, so it's not up to us 93 * to deal with which ENGINE it comes from. 94 */ 95 const DH_METHOD *mtmp; 96 97 mtmp = dh->meth; 98 if (mtmp->finish) 99 mtmp->finish(dh); 100 dh->meth = meth; 101 if (meth->init) 102 meth->init(dh); 103 return 1; 104 } 105 LCRYPTO_ALIAS(DH_set_method); 106 107 DH * 108 DH_new(void) 109 { 110 return DH_new_method(NULL); 111 } 112 LCRYPTO_ALIAS(DH_new); 113 114 DH * 115 DH_new_method(ENGINE *engine) 116 { 117 DH *dh; 118 119 if ((dh = calloc(1, sizeof(*dh))) == NULL) { 120 DHerror(ERR_R_MALLOC_FAILURE); 121 goto err; 122 } 123 124 dh->meth = DH_get_default_method(); 125 dh->flags = dh->meth->flags & ~DH_FLAG_NON_FIPS_ALLOW; 126 dh->references = 1; 127 128 if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DH, dh, &dh->ex_data)) 129 goto err; 130 if (dh->meth->init != NULL && !dh->meth->init(dh)) 131 goto err; 132 133 return dh; 134 135 err: 136 DH_free(dh); 137 138 return NULL; 139 } 140 LCRYPTO_ALIAS(DH_new_method); 141 142 void 143 DH_free(DH *r) 144 { 145 int i; 146 147 if (r == NULL) 148 return; 149 i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DH); 150 if (i > 0) 151 return; 152 153 if (r->meth != NULL && r->meth->finish != NULL) 154 r->meth->finish(r); 155 156 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, r, &r->ex_data); 157 158 BN_free(r->p); 159 BN_free(r->g); 160 BN_free(r->q); 161 BN_free(r->j); 162 free(r->seed); 163 BN_free(r->counter); 164 BN_free(r->pub_key); 165 BN_free(r->priv_key); 166 free(r); 167 } 168 LCRYPTO_ALIAS(DH_free); 169 170 int 171 DH_up_ref(DH *r) 172 { 173 int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DH); 174 175 return i > 1 ? 1 : 0; 176 } 177 LCRYPTO_ALIAS(DH_up_ref); 178 179 int 180 DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 181 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 182 { 183 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DH, argl, argp, new_func, 184 dup_func, free_func); 185 } 186 LCRYPTO_ALIAS(DH_get_ex_new_index); 187 188 int 189 DH_set_ex_data(DH *d, int idx, void *arg) 190 { 191 return CRYPTO_set_ex_data(&d->ex_data, idx, arg); 192 } 193 LCRYPTO_ALIAS(DH_set_ex_data); 194 195 void * 196 DH_get_ex_data(DH *d, int idx) 197 { 198 return CRYPTO_get_ex_data(&d->ex_data, idx); 199 } 200 LCRYPTO_ALIAS(DH_get_ex_data); 201 202 int 203 DH_size(const DH *dh) 204 { 205 return BN_num_bytes(dh->p); 206 } 207 LCRYPTO_ALIAS(DH_size); 208 209 int 210 DH_bits(const DH *dh) 211 { 212 return BN_num_bits(dh->p); 213 } 214 LCRYPTO_ALIAS(DH_bits); 215 216 int 217 DH_security_bits(const DH *dh) 218 { 219 int N = -1; 220 221 if (dh->q != NULL) 222 N = BN_num_bits(dh->q); 223 else if (dh->length > 0) 224 N = dh->length; 225 226 return BN_security_bits(BN_num_bits(dh->p), N); 227 } 228 LCRYPTO_ALIAS(DH_security_bits); 229 230 ENGINE * 231 DH_get0_engine(DH *dh) 232 { 233 return NULL; 234 } 235 LCRYPTO_ALIAS(DH_get0_engine); 236 237 void 238 DH_get0_pqg(const DH *dh, const BIGNUM **p, const BIGNUM **q, const BIGNUM **g) 239 { 240 if (p != NULL) 241 *p = dh->p; 242 if (q != NULL) 243 *q = dh->q; 244 if (g != NULL) 245 *g = dh->g; 246 } 247 LCRYPTO_ALIAS(DH_get0_pqg); 248 249 int 250 DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g) 251 { 252 if ((dh->p == NULL && p == NULL) || (dh->g == NULL && g == NULL)) 253 return 0; 254 255 if (p != NULL) { 256 BN_free(dh->p); 257 dh->p = p; 258 } 259 if (q != NULL) { 260 BN_free(dh->q); 261 dh->q = q; 262 dh->length = BN_num_bits(dh->q); 263 } 264 if (g != NULL) { 265 BN_free(dh->g); 266 dh->g = g; 267 } 268 269 return 1; 270 } 271 LCRYPTO_ALIAS(DH_set0_pqg); 272 273 void 274 DH_get0_key(const DH *dh, const BIGNUM **pub_key, const BIGNUM **priv_key) 275 { 276 if (pub_key != NULL) 277 *pub_key = dh->pub_key; 278 if (priv_key != NULL) 279 *priv_key = dh->priv_key; 280 } 281 LCRYPTO_ALIAS(DH_get0_key); 282 283 int 284 DH_set0_key(DH *dh, BIGNUM *pub_key, BIGNUM *priv_key) 285 { 286 if (pub_key != NULL) { 287 BN_free(dh->pub_key); 288 dh->pub_key = pub_key; 289 } 290 if (priv_key != NULL) { 291 BN_free(dh->priv_key); 292 dh->priv_key = priv_key; 293 } 294 295 return 1; 296 } 297 LCRYPTO_ALIAS(DH_set0_key); 298 299 const BIGNUM * 300 DH_get0_p(const DH *dh) 301 { 302 return dh->p; 303 } 304 LCRYPTO_ALIAS(DH_get0_p); 305 306 const BIGNUM * 307 DH_get0_q(const DH *dh) 308 { 309 return dh->q; 310 } 311 LCRYPTO_ALIAS(DH_get0_q); 312 313 const BIGNUM * 314 DH_get0_g(const DH *dh) 315 { 316 return dh->g; 317 } 318 LCRYPTO_ALIAS(DH_get0_g); 319 320 const BIGNUM * 321 DH_get0_priv_key(const DH *dh) 322 { 323 return dh->priv_key; 324 } 325 LCRYPTO_ALIAS(DH_get0_priv_key); 326 327 const BIGNUM * 328 DH_get0_pub_key(const DH *dh) 329 { 330 return dh->pub_key; 331 } 332 LCRYPTO_ALIAS(DH_get0_pub_key); 333 334 void 335 DH_clear_flags(DH *dh, int flags) 336 { 337 dh->flags &= ~flags; 338 } 339 LCRYPTO_ALIAS(DH_clear_flags); 340 341 int 342 DH_test_flags(const DH *dh, int flags) 343 { 344 return dh->flags & flags; 345 } 346 LCRYPTO_ALIAS(DH_test_flags); 347 348 void 349 DH_set_flags(DH *dh, int flags) 350 { 351 dh->flags |= flags; 352 } 353 LCRYPTO_ALIAS(DH_set_flags); 354 355 long 356 DH_get_length(const DH *dh) 357 { 358 return dh->length; 359 } 360 LCRYPTO_ALIAS(DH_get_length); 361 362 int 363 DH_set_length(DH *dh, long length) 364 { 365 if (length < 0 || length > INT_MAX) 366 return 0; 367 368 dh->length = length; 369 return 1; 370 } 371 LCRYPTO_ALIAS(DH_set_length); 372