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 { 84#ifdef OPENSSL_FIPS 85 if (FIPS_mode()) 86 return FIPS_dh_openssl(); 87 else 88 return DH_OpenSSL(); 89#else 90 default_DH_method = DH_OpenSSL(); 91#endif 92 } 93 return default_DH_method; 94 } 95 96int DH_set_method(DH *dh, const DH_METHOD *meth) 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 const DH_METHOD *mtmp; 101 mtmp = dh->meth; 102 if (mtmp->finish) mtmp->finish(dh); 103#ifndef OPENSSL_NO_ENGINE 104 if (dh->engine) 105 { 106 ENGINE_finish(dh->engine); 107 dh->engine = NULL; 108 } 109#endif 110 dh->meth = meth; 111 if (meth->init) meth->init(dh); 112 return 1; 113 } 114 115DH *DH_new(void) 116 { 117 return DH_new_method(NULL); 118 } 119 120DH *DH_new_method(ENGINE *engine) 121 { 122 DH *ret; 123 124 ret=(DH *)OPENSSL_malloc(sizeof(DH)); 125 if (ret == NULL) 126 { 127 DHerr(DH_F_DH_NEW_METHOD,ERR_R_MALLOC_FAILURE); 128 return(NULL); 129 } 130 131 ret->meth = DH_get_default_method(); 132#ifndef OPENSSL_NO_ENGINE 133 if (engine) 134 { 135 if (!ENGINE_init(engine)) 136 { 137 DHerr(DH_F_DH_NEW_METHOD, ERR_R_ENGINE_LIB); 138 OPENSSL_free(ret); 139 return NULL; 140 } 141 ret->engine = engine; 142 } 143 else 144 ret->engine = ENGINE_get_default_DH(); 145 if(ret->engine) 146 { 147 ret->meth = ENGINE_get_DH(ret->engine); 148 if(!ret->meth) 149 { 150 DHerr(DH_F_DH_NEW_METHOD,ERR_R_ENGINE_LIB); 151 ENGINE_finish(ret->engine); 152 OPENSSL_free(ret); 153 return NULL; 154 } 155 } 156#endif 157 158 ret->pad=0; 159 ret->version=0; 160 ret->p=NULL; 161 ret->g=NULL; 162 ret->length=0; 163 ret->pub_key=NULL; 164 ret->priv_key=NULL; 165 ret->q=NULL; 166 ret->j=NULL; 167 ret->seed = NULL; 168 ret->seedlen = 0; 169 ret->counter = NULL; 170 ret->method_mont_p=NULL; 171 ret->references = 1; 172 ret->flags=ret->meth->flags & ~DH_FLAG_NON_FIPS_ALLOW; 173 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data); 174 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) 175 { 176#ifndef OPENSSL_NO_ENGINE 177 if (ret->engine) 178 ENGINE_finish(ret->engine); 179#endif 180 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data); 181 OPENSSL_free(ret); 182 ret=NULL; 183 } 184 return(ret); 185 } 186 187void DH_free(DH *r) 188 { 189 int i; 190 if(r == NULL) return; 191 i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DH); 192#ifdef REF_PRINT 193 REF_PRINT("DH",r); 194#endif 195 if (i > 0) return; 196#ifdef REF_CHECK 197 if (i < 0) 198 { 199 fprintf(stderr,"DH_free, bad reference count\n"); 200 abort(); 201 } 202#endif 203 204 if (r->meth->finish) 205 r->meth->finish(r); 206#ifndef OPENSSL_NO_ENGINE 207 if (r->engine) 208 ENGINE_finish(r->engine); 209#endif 210 211 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, r, &r->ex_data); 212 213 if (r->p != NULL) BN_clear_free(r->p); 214 if (r->g != NULL) BN_clear_free(r->g); 215 if (r->q != NULL) BN_clear_free(r->q); 216 if (r->j != NULL) BN_clear_free(r->j); 217 if (r->seed) OPENSSL_free(r->seed); 218 if (r->counter != NULL) BN_clear_free(r->counter); 219 if (r->pub_key != NULL) BN_clear_free(r->pub_key); 220 if (r->priv_key != NULL) BN_clear_free(r->priv_key); 221 OPENSSL_free(r); 222 } 223 224int DH_up_ref(DH *r) 225 { 226 int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DH); 227#ifdef REF_PRINT 228 REF_PRINT("DH",r); 229#endif 230#ifdef REF_CHECK 231 if (i < 2) 232 { 233 fprintf(stderr, "DH_up, bad reference count\n"); 234 abort(); 235 } 236#endif 237 return ((i > 1) ? 1 : 0); 238 } 239 240int DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 241 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 242 { 243 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DH, argl, argp, 244 new_func, dup_func, free_func); 245 } 246 247int DH_set_ex_data(DH *d, int idx, void *arg) 248 { 249 return(CRYPTO_set_ex_data(&d->ex_data,idx,arg)); 250 } 251 252void *DH_get_ex_data(DH *d, int idx) 253 { 254 return(CRYPTO_get_ex_data(&d->ex_data,idx)); 255 } 256 257int DH_size(const DH *dh) 258 { 259 return(BN_num_bytes(dh->p)); 260 } 261