1 /* $OpenBSD: dh_lib.c,v 1.15 2014/06/12 15:49:28 deraadt Exp $ */ 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 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 { 80 default_DH_method = DH_OpenSSL(); 81 } 82 return default_DH_method; 83 } 84 85 int DH_set_method(DH *dh, const DH_METHOD *meth) 86 { 87 /* NB: The caller is specifically setting a method, so it's not up to us 88 * to deal with which ENGINE it comes from. */ 89 const DH_METHOD *mtmp; 90 mtmp = dh->meth; 91 if (mtmp->finish) mtmp->finish(dh); 92 #ifndef OPENSSL_NO_ENGINE 93 if (dh->engine) 94 { 95 ENGINE_finish(dh->engine); 96 dh->engine = NULL; 97 } 98 #endif 99 dh->meth = meth; 100 if (meth->init) meth->init(dh); 101 return 1; 102 } 103 104 DH *DH_new(void) 105 { 106 return DH_new_method(NULL); 107 } 108 109 DH *DH_new_method(ENGINE *engine) 110 { 111 DH *ret; 112 113 ret = malloc(sizeof(DH)); 114 if (ret == NULL) 115 { 116 DHerr(DH_F_DH_NEW_METHOD,ERR_R_MALLOC_FAILURE); 117 return(NULL); 118 } 119 120 ret->meth = DH_get_default_method(); 121 #ifndef OPENSSL_NO_ENGINE 122 if (engine) 123 { 124 if (!ENGINE_init(engine)) 125 { 126 DHerr(DH_F_DH_NEW_METHOD, ERR_R_ENGINE_LIB); 127 free(ret); 128 return NULL; 129 } 130 ret->engine = engine; 131 } 132 else 133 ret->engine = ENGINE_get_default_DH(); 134 if(ret->engine) 135 { 136 ret->meth = ENGINE_get_DH(ret->engine); 137 if(!ret->meth) 138 { 139 DHerr(DH_F_DH_NEW_METHOD,ERR_R_ENGINE_LIB); 140 ENGINE_finish(ret->engine); 141 free(ret); 142 return NULL; 143 } 144 } 145 #endif 146 147 ret->pad=0; 148 ret->version=0; 149 ret->p=NULL; 150 ret->g=NULL; 151 ret->length=0; 152 ret->pub_key=NULL; 153 ret->priv_key=NULL; 154 ret->q=NULL; 155 ret->j=NULL; 156 ret->seed = NULL; 157 ret->seedlen = 0; 158 ret->counter = NULL; 159 ret->method_mont_p=NULL; 160 ret->references = 1; 161 ret->flags=ret->meth->flags & ~DH_FLAG_NON_FIPS_ALLOW; 162 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data); 163 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) 164 { 165 #ifndef OPENSSL_NO_ENGINE 166 if (ret->engine) 167 ENGINE_finish(ret->engine); 168 #endif 169 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data); 170 free(ret); 171 ret=NULL; 172 } 173 return(ret); 174 } 175 176 void DH_free(DH *r) 177 { 178 int i; 179 if(r == NULL) return; 180 i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DH); 181 if (i > 0) return; 182 183 if (r->meth->finish) 184 r->meth->finish(r); 185 #ifndef OPENSSL_NO_ENGINE 186 if (r->engine) 187 ENGINE_finish(r->engine); 188 #endif 189 190 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, r, &r->ex_data); 191 192 if (r->p != NULL) BN_clear_free(r->p); 193 if (r->g != NULL) BN_clear_free(r->g); 194 if (r->q != NULL) BN_clear_free(r->q); 195 if (r->j != NULL) BN_clear_free(r->j); 196 free(r->seed); 197 if (r->counter != NULL) BN_clear_free(r->counter); 198 if (r->pub_key != NULL) BN_clear_free(r->pub_key); 199 if (r->priv_key != NULL) BN_clear_free(r->priv_key); 200 free(r); 201 } 202 203 int DH_up_ref(DH *r) 204 { 205 int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DH); 206 return ((i > 1) ? 1 : 0); 207 } 208 209 int DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 210 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 211 { 212 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DH, argl, argp, 213 new_func, dup_func, free_func); 214 } 215 216 int DH_set_ex_data(DH *d, int idx, void *arg) 217 { 218 return(CRYPTO_set_ex_data(&d->ex_data,idx,arg)); 219 } 220 221 void *DH_get_ex_data(DH *d, int idx) 222 { 223 return(CRYPTO_get_ex_data(&d->ex_data,idx)); 224 } 225 226 int DH_size(const DH *dh) 227 { 228 return(BN_num_bytes(dh->p)); 229 } 230