1 /* $OpenBSD: ech_lib.c,v 1.14 2018/04/14 07:09:21 tb 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 ENGINE_finish(ecdh->engine); 113 ecdh->engine = NULL; 114 #endif 115 ecdh->meth = meth; 116 return 1; 117 } 118 119 static ECDH_DATA * 120 ECDH_DATA_new_method(ENGINE *engine) 121 { 122 ECDH_DATA *ret; 123 124 ret = malloc(sizeof(ECDH_DATA)); 125 if (ret == NULL) { 126 ECDHerror(ERR_R_MALLOC_FAILURE); 127 return (NULL); 128 } 129 130 ret->init = NULL; 131 132 ret->meth = ECDH_get_default_method(); 133 ret->engine = engine; 134 #ifndef OPENSSL_NO_ENGINE 135 if (!ret->engine) 136 ret->engine = ENGINE_get_default_ECDH(); 137 if (ret->engine) { 138 ret->meth = ENGINE_get_ECDH(ret->engine); 139 if (ret->meth == NULL) { 140 ECDHerror(ERR_R_ENGINE_LIB); 141 ENGINE_finish(ret->engine); 142 free(ret); 143 return NULL; 144 } 145 } 146 #endif 147 148 ret->flags = ret->meth->flags; 149 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_ECDH, ret, &ret->ex_data); 150 return (ret); 151 } 152 153 static void * 154 ecdh_data_new(void) 155 { 156 return (void *)ECDH_DATA_new_method(NULL); 157 } 158 159 static void * 160 ecdh_data_dup(void *data) 161 { 162 ECDH_DATA *r = (ECDH_DATA *)data; 163 164 /* XXX: dummy operation */ 165 if (r == NULL) 166 return NULL; 167 168 return (void *)ecdh_data_new(); 169 } 170 171 void 172 ecdh_data_free(void *data) 173 { 174 ECDH_DATA *r = (ECDH_DATA *)data; 175 176 #ifndef OPENSSL_NO_ENGINE 177 ENGINE_finish(r->engine); 178 #endif 179 180 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDH, r, &r->ex_data); 181 182 freezero(r, sizeof(ECDH_DATA)); 183 } 184 185 ECDH_DATA * 186 ecdh_check(EC_KEY *key) 187 { 188 ECDH_DATA *ecdh_data; 189 190 void *data = EC_KEY_get_key_method_data(key, ecdh_data_dup, 191 ecdh_data_free, ecdh_data_free); 192 if (data == NULL) { 193 ecdh_data = (ECDH_DATA *)ecdh_data_new(); 194 if (ecdh_data == NULL) 195 return NULL; 196 data = EC_KEY_insert_key_method_data(key, (void *)ecdh_data, 197 ecdh_data_dup, ecdh_data_free, ecdh_data_free); 198 if (data != NULL) { 199 /* Another thread raced us to install the key_method 200 * data and won. */ 201 ecdh_data_free(ecdh_data); 202 ecdh_data = (ECDH_DATA *)data; 203 } 204 } else 205 ecdh_data = (ECDH_DATA *)data; 206 207 return ecdh_data; 208 } 209 210 int 211 ECDH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 212 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 213 { 214 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_ECDH, argl, argp, 215 new_func, dup_func, free_func); 216 } 217 218 int 219 ECDH_set_ex_data(EC_KEY *d, int idx, void *arg) 220 { 221 ECDH_DATA *ecdh; 222 ecdh = ecdh_check(d); 223 if (ecdh == NULL) 224 return 0; 225 return (CRYPTO_set_ex_data(&ecdh->ex_data, idx, arg)); 226 } 227 228 void * 229 ECDH_get_ex_data(EC_KEY *d, int idx) 230 { 231 ECDH_DATA *ecdh; 232 ecdh = ecdh_check(d); 233 if (ecdh == NULL) 234 return NULL; 235 return (CRYPTO_get_ex_data(&ecdh->ex_data, idx)); 236 } 237 238 int 239 ECDH_size(const EC_KEY *d) 240 { 241 return ((EC_GROUP_get_degree(EC_KEY_get0_group(d)) + 7) / 8); 242 } 243