1 /* $OpenBSD: ech_lib.c,v 1.10 2015/09/13 10:46:20 jsing Exp $ */ 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 <string.h> 71 72 #include <openssl/opensslconf.h> 73 74 #include "ech_locl.h" 75 #ifndef OPENSSL_NO_ENGINE 76 #include <openssl/engine.h> 77 #endif 78 #include <openssl/err.h> 79 80 static const ECDH_METHOD *default_ECDH_method = NULL; 81 82 static void *ecdh_data_new(void); 83 static void *ecdh_data_dup(void *); 84 static void ecdh_data_free(void *); 85 86 void 87 ECDH_set_default_method(const ECDH_METHOD *meth) 88 { 89 default_ECDH_method = meth; 90 } 91 92 const ECDH_METHOD * 93 ECDH_get_default_method(void) 94 { 95 if (!default_ECDH_method) { 96 default_ECDH_method = ECDH_OpenSSL(); 97 } 98 return default_ECDH_method; 99 } 100 101 int 102 ECDH_set_method(EC_KEY *eckey, const ECDH_METHOD *meth) 103 { 104 ECDH_DATA *ecdh; 105 106 ecdh = ecdh_check(eckey); 107 108 if (ecdh == NULL) 109 return 0; 110 111 #ifndef OPENSSL_NO_ENGINE 112 if (ecdh->engine) { 113 ENGINE_finish(ecdh->engine); 114 ecdh->engine = NULL; 115 } 116 #endif 117 ecdh->meth = meth; 118 return 1; 119 } 120 121 static ECDH_DATA * 122 ECDH_DATA_new_method(ENGINE *engine) 123 { 124 ECDH_DATA *ret; 125 126 ret = malloc(sizeof(ECDH_DATA)); 127 if (ret == NULL) { 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 ret->meth = ENGINE_get_ECDH(ret->engine); 141 if (!ret->meth) { 142 ECDHerr(ECDH_F_ECDH_DATA_NEW_METHOD, ERR_R_ENGINE_LIB); 143 ENGINE_finish(ret->engine); 144 free(ret); 145 return NULL; 146 } 147 } 148 #endif 149 150 ret->flags = ret->meth->flags; 151 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_ECDH, ret, &ret->ex_data); 152 return (ret); 153 } 154 155 static void * 156 ecdh_data_new(void) 157 { 158 return (void *)ECDH_DATA_new_method(NULL); 159 } 160 161 static void * 162 ecdh_data_dup(void *data) 163 { 164 ECDH_DATA *r = (ECDH_DATA *)data; 165 166 /* XXX: dummy operation */ 167 if (r == NULL) 168 return NULL; 169 170 return (void *)ecdh_data_new(); 171 } 172 173 void 174 ecdh_data_free(void *data) 175 { 176 ECDH_DATA *r = (ECDH_DATA *)data; 177 178 #ifndef OPENSSL_NO_ENGINE 179 if (r->engine) 180 ENGINE_finish(r->engine); 181 #endif 182 183 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDH, r, &r->ex_data); 184 185 explicit_bzero((void *)r, sizeof(ECDH_DATA)); 186 187 free(r); 188 } 189 190 ECDH_DATA * 191 ecdh_check(EC_KEY *key) 192 { 193 ECDH_DATA *ecdh_data; 194 195 void *data = EC_KEY_get_key_method_data(key, ecdh_data_dup, 196 ecdh_data_free, ecdh_data_free); 197 if (data == NULL) { 198 ecdh_data = (ECDH_DATA *)ecdh_data_new(); 199 if (ecdh_data == NULL) 200 return NULL; 201 data = EC_KEY_insert_key_method_data(key, (void *)ecdh_data, 202 ecdh_data_dup, ecdh_data_free, ecdh_data_free); 203 if (data != NULL) { 204 /* Another thread raced us to install the key_method 205 * data and won. */ 206 ecdh_data_free(ecdh_data); 207 ecdh_data = (ECDH_DATA *)data; 208 } 209 } else 210 ecdh_data = (ECDH_DATA *)data; 211 212 return ecdh_data; 213 } 214 215 int 216 ECDH_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 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_ECDH, argl, argp, 220 new_func, dup_func, free_func); 221 } 222 223 int 224 ECDH_set_ex_data(EC_KEY *d, int idx, void *arg) 225 { 226 ECDH_DATA *ecdh; 227 ecdh = ecdh_check(d); 228 if (ecdh == NULL) 229 return 0; 230 return (CRYPTO_set_ex_data(&ecdh->ex_data, idx, arg)); 231 } 232 233 void * 234 ECDH_get_ex_data(EC_KEY *d, int idx) 235 { 236 ECDH_DATA *ecdh; 237 ecdh = ecdh_check(d); 238 if (ecdh == NULL) 239 return NULL; 240 return (CRYPTO_get_ex_data(&ecdh->ex_data, idx)); 241 } 242 243 int 244 ECDH_size(const EC_KEY *d) 245 { 246 return ((EC_GROUP_get_degree(EC_KEY_get0_group(d)) + 7) / 8); 247 } 248