1/* crypto/ecdh/ech_lib.c */ 2/* ==================================================================== 3 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. 4 * 5 * The Elliptic Curve Public-Key Crypto Library (ECC Code) included 6 * herein is developed by SUN MICROSYSTEMS, INC., and is contributed 7 * to the OpenSSL project. 8 * 9 * The ECC Code is licensed pursuant to the OpenSSL open source 10 * license provided below. 11 * 12 * The ECDH software is originally written by Douglas Stebila of 13 * Sun Microsystems Laboratories. 14 * 15 */ 16/* ==================================================================== 17 * Copyright (c) 1998-2003 The OpenSSL Project. All rights reserved. 18 * 19 * Redistribution and use in source and binary forms, with or without 20 * modification, are permitted provided that the following conditions 21 * are met: 22 * 23 * 1. Redistributions of source code must retain the above copyright 24 * notice, this list of conditions and the following disclaimer. 25 * 26 * 2. Redistributions in binary form must reproduce the above copyright 27 * notice, this list of conditions and the following disclaimer in 28 * the documentation and/or other materials provided with the 29 * distribution. 30 * 31 * 3. All advertising materials mentioning features or use of this 32 * software must display the following acknowledgment: 33 * "This product includes software developed by the OpenSSL Project 34 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 35 * 36 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 37 * endorse or promote products derived from this software without 38 * prior written permission. For written permission, please contact 39 * openssl-core@OpenSSL.org. 40 * 41 * 5. Products derived from this software may not be called "OpenSSL" 42 * nor may "OpenSSL" appear in their names without prior written 43 * permission of the OpenSSL Project. 44 * 45 * 6. Redistributions of any form whatsoever must retain the following 46 * acknowledgment: 47 * "This product includes software developed by the OpenSSL Project 48 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 49 * 50 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 51 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 53 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 54 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 55 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 56 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 57 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 58 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 59 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 60 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 61 * OF THE POSSIBILITY OF SUCH DAMAGE. 62 * ==================================================================== 63 * 64 * This product includes cryptographic software written by Eric Young 65 * (eay@cryptsoft.com). This product includes software written by Tim 66 * Hudson (tjh@cryptsoft.com). 67 * 68 */ 69 70#include "ech_locl.h" 71#include <string.h> 72#ifndef OPENSSL_NO_ENGINE 73#include <openssl/engine.h> 74#endif 75#include <openssl/err.h> 76 77const char ECDH_version[]="ECDH" OPENSSL_VERSION_PTEXT; 78 79static const ECDH_METHOD *default_ECDH_method = NULL; 80 81static void *ecdh_data_new(void); 82static void *ecdh_data_dup(void *); 83static void ecdh_data_free(void *); 84 85void ECDH_set_default_method(const ECDH_METHOD *meth) 86 { 87 default_ECDH_method = meth; 88 } 89 90const ECDH_METHOD *ECDH_get_default_method(void) 91 { 92 if(!default_ECDH_method) 93 default_ECDH_method = ECDH_OpenSSL(); 94 return default_ECDH_method; 95 } 96 97int ECDH_set_method(EC_KEY *eckey, const ECDH_METHOD *meth) 98 { 99 ECDH_DATA *ecdh; 100 101 ecdh = ecdh_check(eckey); 102 103 if (ecdh == NULL) 104 return 0; 105 106#ifndef OPENSSL_NO_ENGINE 107 if (ecdh->engine) 108 { 109 ENGINE_finish(ecdh->engine); 110 ecdh->engine = NULL; 111 } 112#endif 113 ecdh->meth = meth; 114#if 0 115 if (meth->init) 116 meth->init(eckey); 117#endif 118 return 1; 119 } 120 121static ECDH_DATA *ECDH_DATA_new_method(ENGINE *engine) 122 { 123 ECDH_DATA *ret; 124 125 ret=(ECDH_DATA *)OPENSSL_malloc(sizeof(ECDH_DATA)); 126 if (ret == NULL) 127 { 128 ECDHerr(ECDH_F_ECDH_DATA_NEW_METHOD, ERR_R_MALLOC_FAILURE); 129 return(NULL); 130 } 131 132 ret->init = NULL; 133 134 ret->meth = ECDH_get_default_method(); 135 ret->engine = engine; 136#ifndef OPENSSL_NO_ENGINE 137 if (!ret->engine) 138 ret->engine = ENGINE_get_default_ECDH(); 139 if (ret->engine) 140 { 141 ret->meth = ENGINE_get_ECDH(ret->engine); 142 if (!ret->meth) 143 { 144 ECDHerr(ECDH_F_ECDH_DATA_NEW_METHOD, ERR_R_ENGINE_LIB); 145 ENGINE_finish(ret->engine); 146 OPENSSL_free(ret); 147 return NULL; 148 } 149 } 150#endif 151 152 ret->flags = ret->meth->flags; 153 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_ECDH, ret, &ret->ex_data); 154#if 0 155 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) 156 { 157 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDH, ret, &ret->ex_data); 158 OPENSSL_free(ret); 159 ret=NULL; 160 } 161#endif 162 return(ret); 163 } 164 165static void *ecdh_data_new(void) 166 { 167 return (void *)ECDH_DATA_new_method(NULL); 168 } 169 170static void *ecdh_data_dup(void *data) 171{ 172 ECDH_DATA *r = (ECDH_DATA *)data; 173 174 /* XXX: dummy operation */ 175 if (r == NULL) 176 return NULL; 177 178 return (void *)ecdh_data_new(); 179} 180 181void ecdh_data_free(void *data) 182 { 183 ECDH_DATA *r = (ECDH_DATA *)data; 184 185#ifndef OPENSSL_NO_ENGINE 186 if (r->engine) 187 ENGINE_finish(r->engine); 188#endif 189 190 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDH, r, &r->ex_data); 191 192 OPENSSL_cleanse((void *)r, sizeof(ECDH_DATA)); 193 194 OPENSSL_free(r); 195 } 196 197ECDH_DATA *ecdh_check(EC_KEY *key) 198 { 199 ECDH_DATA *ecdh_data; 200 201 void *data = EC_KEY_get_key_method_data(key, ecdh_data_dup, 202 ecdh_data_free, ecdh_data_free); 203 if (data == NULL) 204 { 205 ecdh_data = (ECDH_DATA *)ecdh_data_new(); 206 if (ecdh_data == NULL) 207 return NULL; 208 data = EC_KEY_insert_key_method_data(key, (void *)ecdh_data, 209 ecdh_data_dup, ecdh_data_free, ecdh_data_free); 210 if (data != NULL) 211 { 212 /* Another thread raced us to install the key_method 213 * data and won. */ 214 ecdh_data_free(ecdh_data); 215 ecdh_data = (ECDH_DATA *)data; 216 } 217 } 218 else 219 ecdh_data = (ECDH_DATA *)data; 220 221 222 return ecdh_data; 223 } 224 225int ECDH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 226 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 227 { 228 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_ECDH, argl, argp, 229 new_func, dup_func, free_func); 230 } 231 232int ECDH_set_ex_data(EC_KEY *d, int idx, void *arg) 233 { 234 ECDH_DATA *ecdh; 235 ecdh = ecdh_check(d); 236 if (ecdh == NULL) 237 return 0; 238 return(CRYPTO_set_ex_data(&ecdh->ex_data,idx,arg)); 239 } 240 241void *ECDH_get_ex_data(EC_KEY *d, int idx) 242 { 243 ECDH_DATA *ecdh; 244 ecdh = ecdh_check(d); 245 if (ecdh == NULL) 246 return NULL; 247 return(CRYPTO_get_ex_data(&ecdh->ex_data,idx)); 248 } 249