dh_lib.c revision 280304
1/* crypto/dh/dh_lib.c */ 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 <stdio.h> 60#include "cryptlib.h" 61#include <openssl/bn.h> 62#include <openssl/dh.h> 63#ifndef OPENSSL_NO_ENGINE 64# include <openssl/engine.h> 65#endif 66 67#ifdef OPENSSL_FIPS 68# include <openssl/fips.h> 69#endif 70 71const char DH_version[] = "Diffie-Hellman" OPENSSL_VERSION_PTEXT; 72 73static const DH_METHOD *default_DH_method = NULL; 74 75void DH_set_default_method(const DH_METHOD *meth) 76{ 77 default_DH_method = meth; 78} 79 80const DH_METHOD *DH_get_default_method(void) 81{ 82 if (!default_DH_method) { 83#ifdef OPENSSL_FIPS 84 if (FIPS_mode()) 85 return FIPS_dh_openssl(); 86 else 87 return DH_OpenSSL(); 88#else 89 default_DH_method = DH_OpenSSL(); 90#endif 91 } 92 return default_DH_method; 93} 94 95int DH_set_method(DH *dh, const DH_METHOD *meth) 96{ 97 /* 98 * NB: The caller is specifically setting a method, so it's not up to us 99 * to deal with which ENGINE it comes from. 100 */ 101 const DH_METHOD *mtmp; 102 mtmp = dh->meth; 103 if (mtmp->finish) 104 mtmp->finish(dh); 105#ifndef OPENSSL_NO_ENGINE 106 if (dh->engine) { 107 ENGINE_finish(dh->engine); 108 dh->engine = NULL; 109 } 110#endif 111 dh->meth = meth; 112 if (meth->init) 113 meth->init(dh); 114 return 1; 115} 116 117DH *DH_new(void) 118{ 119 return DH_new_method(NULL); 120} 121 122DH *DH_new_method(ENGINE *engine) 123{ 124 DH *ret; 125 126 ret = (DH *)OPENSSL_malloc(sizeof(DH)); 127 if (ret == NULL) { 128 DHerr(DH_F_DH_NEW_METHOD, ERR_R_MALLOC_FAILURE); 129 return (NULL); 130 } 131 132 ret->meth = DH_get_default_method(); 133#ifndef OPENSSL_NO_ENGINE 134 if (engine) { 135 if (!ENGINE_init(engine)) { 136 DHerr(DH_F_DH_NEW_METHOD, ERR_R_ENGINE_LIB); 137 OPENSSL_free(ret); 138 return NULL; 139 } 140 ret->engine = engine; 141 } else 142 ret->engine = ENGINE_get_default_DH(); 143 if (ret->engine) { 144 ret->meth = ENGINE_get_DH(ret->engine); 145 if (!ret->meth) { 146 DHerr(DH_F_DH_NEW_METHOD, ERR_R_ENGINE_LIB); 147 ENGINE_finish(ret->engine); 148 OPENSSL_free(ret); 149 return NULL; 150 } 151 } 152#endif 153 154 ret->pad = 0; 155 ret->version = 0; 156 ret->p = NULL; 157 ret->g = NULL; 158 ret->length = 0; 159 ret->pub_key = NULL; 160 ret->priv_key = NULL; 161 ret->q = NULL; 162 ret->j = NULL; 163 ret->seed = NULL; 164 ret->seedlen = 0; 165 ret->counter = NULL; 166 ret->method_mont_p = NULL; 167 ret->references = 1; 168 ret->flags = ret->meth->flags & ~DH_FLAG_NON_FIPS_ALLOW; 169 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data); 170 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) { 171#ifndef OPENSSL_NO_ENGINE 172 if (ret->engine) 173 ENGINE_finish(ret->engine); 174#endif 175 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data); 176 OPENSSL_free(ret); 177 ret = NULL; 178 } 179 return (ret); 180} 181 182void DH_free(DH *r) 183{ 184 int i; 185 if (r == NULL) 186 return; 187 i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DH); 188#ifdef REF_PRINT 189 REF_PRINT("DH", r); 190#endif 191 if (i > 0) 192 return; 193#ifdef REF_CHECK 194 if (i < 0) { 195 fprintf(stderr, "DH_free, bad reference count\n"); 196 abort(); 197 } 198#endif 199 200 if (r->meth->finish) 201 r->meth->finish(r); 202#ifndef OPENSSL_NO_ENGINE 203 if (r->engine) 204 ENGINE_finish(r->engine); 205#endif 206 207 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, r, &r->ex_data); 208 209 if (r->p != NULL) 210 BN_clear_free(r->p); 211 if (r->g != NULL) 212 BN_clear_free(r->g); 213 if (r->q != NULL) 214 BN_clear_free(r->q); 215 if (r->j != NULL) 216 BN_clear_free(r->j); 217 if (r->seed) 218 OPENSSL_free(r->seed); 219 if (r->counter != NULL) 220 BN_clear_free(r->counter); 221 if (r->pub_key != NULL) 222 BN_clear_free(r->pub_key); 223 if (r->priv_key != NULL) 224 BN_clear_free(r->priv_key); 225 OPENSSL_free(r); 226} 227 228int DH_up_ref(DH *r) 229{ 230 int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DH); 231#ifdef REF_PRINT 232 REF_PRINT("DH", r); 233#endif 234#ifdef REF_CHECK 235 if (i < 2) { 236 fprintf(stderr, "DH_up, bad reference count\n"); 237 abort(); 238 } 239#endif 240 return ((i > 1) ? 1 : 0); 241} 242 243int DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 244 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 245{ 246 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DH, argl, argp, 247 new_func, dup_func, free_func); 248} 249 250int DH_set_ex_data(DH *d, int idx, void *arg) 251{ 252 return (CRYPTO_set_ex_data(&d->ex_data, idx, arg)); 253} 254 255void *DH_get_ex_data(DH *d, int idx) 256{ 257 return (CRYPTO_get_ex_data(&d->ex_data, idx)); 258} 259 260int DH_size(const DH *dh) 261{ 262 return (BN_num_bytes(dh->p)); 263} 264