1 /* crypto/dh/dh_lib.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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 const char DH_version[]="Diffie-Hellman" OPENSSL_VERSION_PTEXT; 68 69 static const DH_METHOD *default_DH_method = NULL; 70 71 void DH_set_default_method(const DH_METHOD *meth) 72 { 73 default_DH_method = meth; 74 } 75 76 const DH_METHOD *DH_get_default_method(void) 77 { 78 if(!default_DH_method) 79 default_DH_method = DH_OpenSSL(); 80 return default_DH_method; 81 } 82 83 int DH_set_method(DH *dh, const DH_METHOD *meth) 84 { 85 /* NB: The caller is specifically setting a method, so it's not up to us 86 * to deal with which ENGINE it comes from. */ 87 const DH_METHOD *mtmp; 88 mtmp = dh->meth; 89 if (mtmp->finish) mtmp->finish(dh); 90 #ifndef OPENSSL_NO_ENGINE 91 if (dh->engine) 92 { 93 ENGINE_finish(dh->engine); 94 dh->engine = NULL; 95 } 96 #endif 97 dh->meth = meth; 98 if (meth->init) meth->init(dh); 99 return 1; 100 } 101 102 DH *DH_new(void) 103 { 104 return DH_new_method(NULL); 105 } 106 107 DH *DH_new_method(ENGINE *engine) 108 { 109 DH *ret; 110 111 ret=(DH *)OPENSSL_malloc(sizeof(DH)); 112 if (ret == NULL) 113 { 114 DHerr(DH_F_DH_NEW_METHOD,ERR_R_MALLOC_FAILURE); 115 return(NULL); 116 } 117 118 ret->meth = DH_get_default_method(); 119 #ifndef OPENSSL_NO_ENGINE 120 if (engine) 121 { 122 if (!ENGINE_init(engine)) 123 { 124 DHerr(DH_F_DH_NEW_METHOD, ERR_R_ENGINE_LIB); 125 OPENSSL_free(ret); 126 return NULL; 127 } 128 ret->engine = engine; 129 } 130 else 131 ret->engine = ENGINE_get_default_DH(); 132 if(ret->engine) 133 { 134 ret->meth = ENGINE_get_DH(ret->engine); 135 if(!ret->meth) 136 { 137 DHerr(DH_F_DH_NEW_METHOD,ERR_R_ENGINE_LIB); 138 ENGINE_finish(ret->engine); 139 OPENSSL_free(ret); 140 return NULL; 141 } 142 } 143 #endif 144 145 ret->pad=0; 146 ret->version=0; 147 ret->p=NULL; 148 ret->g=NULL; 149 ret->length=0; 150 ret->pub_key=NULL; 151 ret->priv_key=NULL; 152 ret->q=NULL; 153 ret->j=NULL; 154 ret->seed = NULL; 155 ret->seedlen = 0; 156 ret->counter = NULL; 157 ret->method_mont_p=NULL; 158 ret->references = 1; 159 ret->flags=ret->meth->flags; 160 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data); 161 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) 162 { 163 #ifndef OPENSSL_NO_ENGINE 164 if (ret->engine) 165 ENGINE_finish(ret->engine); 166 #endif 167 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data); 168 OPENSSL_free(ret); 169 ret=NULL; 170 } 171 return(ret); 172 } 173 174 void DH_free(DH *r) 175 { 176 int i; 177 if(r == NULL) return; 178 i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DH); 179 #ifdef REF_PRINT 180 REF_PRINT("DH",r); 181 #endif 182 if (i > 0) return; 183 #ifdef REF_CHECK 184 if (i < 0) 185 { 186 fprintf(stderr,"DH_free, bad reference count\n"); 187 abort(); 188 } 189 #endif 190 191 if (r->meth->finish) 192 r->meth->finish(r); 193 #ifndef OPENSSL_NO_ENGINE 194 if (r->engine) 195 ENGINE_finish(r->engine); 196 #endif 197 198 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, r, &r->ex_data); 199 200 if (r->p != NULL) BN_clear_free(r->p); 201 if (r->g != NULL) BN_clear_free(r->g); 202 if (r->q != NULL) BN_clear_free(r->q); 203 if (r->j != NULL) BN_clear_free(r->j); 204 if (r->seed) OPENSSL_free(r->seed); 205 if (r->counter != NULL) BN_clear_free(r->counter); 206 if (r->pub_key != NULL) BN_clear_free(r->pub_key); 207 if (r->priv_key != NULL) BN_clear_free(r->priv_key); 208 OPENSSL_free(r); 209 } 210 211 int DH_up_ref(DH *r) 212 { 213 int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DH); 214 #ifdef REF_PRINT 215 REF_PRINT("DH",r); 216 #endif 217 #ifdef REF_CHECK 218 if (i < 2) 219 { 220 fprintf(stderr, "DH_up, bad reference count\n"); 221 abort(); 222 } 223 #endif 224 return ((i > 1) ? 1 : 0); 225 } 226 227 int DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 228 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 229 { 230 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DH, argl, argp, 231 new_func, dup_func, free_func); 232 } 233 234 int DH_set_ex_data(DH *d, int idx, void *arg) 235 { 236 return(CRYPTO_set_ex_data(&d->ex_data,idx,arg)); 237 } 238 239 void *DH_get_ex_data(DH *d, int idx) 240 { 241 return(CRYPTO_get_ex_data(&d->ex_data,idx)); 242 } 243 244 int DH_size(const DH *dh) 245 { 246 return(BN_num_bytes(dh->p)); 247 } 248
