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