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 DH_METHOD *default_DH_method; 68 static int dh_meth_num = 0; 69 static STACK_OF(CRYPTO_EX_DATA_FUNCS) *dh_meth = NULL; 70 71 void DH_set_default_openssl_method(DH_METHOD *meth) 72 { 73 ENGINE *e; 74 /* We'll need to notify the "openssl" ENGINE of this 75 * change too. We won't bother locking things down at 76 * our end as there was never any locking in these 77 * functions! */ 78 if(default_DH_method != meth) 79 { 80 default_DH_method = meth; 81 e = ENGINE_by_id("openssl"); 82 if(e) 83 { 84 ENGINE_set_DH(e, meth); 85 ENGINE_free(e); 86 } 87 } 88 } 89 90 DH_METHOD *DH_get_default_openssl_method(void) 91 { 92 if(!default_DH_method) default_DH_method = DH_OpenSSL(); 93 return default_DH_method; 94 } 95 96 #if 0 97 DH_METHOD *DH_set_method(DH *dh, DH_METHOD *meth) 98 { 99 DH_METHOD *mtmp; 100 mtmp = dh->meth; 101 if (mtmp->finish) mtmp->finish(dh); 102 dh->meth = meth; 103 if (meth->init) meth->init(dh); 104 return mtmp; 105 } 106 #else 107 int DH_set_method(DH *dh, ENGINE *engine) 108 { 109 ENGINE *mtmp; 110 DH_METHOD *meth; 111 mtmp = dh->engine; 112 meth = ENGINE_get_DH(mtmp); 113 if (!ENGINE_init(engine)) 114 return 0; 115 if (meth->finish) meth->finish(dh); 116 dh->engine= engine; 117 meth = ENGINE_get_DH(engine); 118 if (meth->init) meth->init(dh); 119 /* SHOULD ERROR CHECK THIS!!! */ 120 ENGINE_finish(mtmp); 121 return 1; 122 } 123 #endif 124 125 DH *DH_new(void) 126 { 127 return DH_new_method(NULL); 128 } 129 130 #if 0 131 DH *DH_new_method(DH_METHOD *meth) 132 #else 133 DH *DH_new_method(ENGINE *engine) 134 #endif 135 { 136 DH_METHOD *meth; 137 DH *ret; 138 ret=(DH *)OPENSSL_malloc(sizeof(DH)); 139 140 if (ret == NULL) 141 { 142 DHerr(DH_F_DH_NEW,ERR_R_MALLOC_FAILURE); 143 return(NULL); 144 } 145 if(engine) 146 ret->engine = engine; 147 else 148 { 149 if((ret->engine=ENGINE_get_default_DH()) == NULL) 150 { 151 OPENSSL_free(ret); 152 return NULL; 153 } 154 } 155 meth = ENGINE_get_DH(ret->engine); 156 ret->pad=0; 157 ret->version=0; 158 ret->p=NULL; 159 ret->g=NULL; 160 ret->length=0; 161 ret->pub_key=NULL; 162 ret->priv_key=NULL; 163 ret->q=NULL; 164 ret->j=NULL; 165 ret->seed = NULL; 166 ret->seedlen = 0; 167 ret->counter = NULL; 168 ret->method_mont_p=NULL; 169 ret->references = 1; 170 ret->flags=meth->flags; 171 CRYPTO_new_ex_data(dh_meth,ret,&ret->ex_data); 172 if ((meth->init != NULL) && !meth->init(ret)) 173 { 174 CRYPTO_free_ex_data(dh_meth,ret,&ret->ex_data); 175 OPENSSL_free(ret); 176 ret=NULL; 177 } 178 return(ret); 179 } 180 181 void DH_free(DH *r) 182 { 183 DH_METHOD *meth; 184 int i; 185 if(r == NULL) return; 186 i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DH); 187 #ifdef REF_PRINT 188 REF_PRINT("DH",r); 189 #endif 190 if (i > 0) return; 191 #ifdef REF_CHECK 192 if (i < 0) 193 { 194 fprintf(stderr,"DH_free, bad reference count\n"); 195 abort(); 196 } 197 #endif 198 199 meth = ENGINE_get_DH(r->engine); 200 if(meth->finish) meth->finish(r); 201 ENGINE_finish(r->engine); 202 203 CRYPTO_free_ex_data(dh_meth, r, &r->ex_data); 204 205 if (r->p != NULL) BN_clear_free(r->p); 206 if (r->g != NULL) BN_clear_free(r->g); 207 if (r->q != NULL) BN_clear_free(r->q); 208 if (r->j != NULL) BN_clear_free(r->j); 209 if (r->seed) OPENSSL_free(r->seed); 210 if (r->counter != NULL) BN_clear_free(r->counter); 211 if (r->pub_key != NULL) BN_clear_free(r->pub_key); 212 if (r->priv_key != NULL) BN_clear_free(r->priv_key); 213 OPENSSL_free(r); 214 } 215 216 int DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 217 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 218 { 219 dh_meth_num++; 220 return(CRYPTO_get_ex_new_index(dh_meth_num-1, 221 &dh_meth,argl,argp,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(DH *dh) 235 { 236 return(BN_num_bytes(dh->p)); 237 } 238