1/* crypto/ecdsa/ecs_lib.c */ 2/* ==================================================================== 3 * Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in 14 * the documentation and/or other materials provided with the 15 * distribution. 16 * 17 * 3. All advertising materials mentioning features or use of this 18 * software must display the following acknowledgment: 19 * "This product includes software developed by the OpenSSL Project 20 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 21 * 22 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 23 * endorse or promote products derived from this software without 24 * prior written permission. For written permission, please contact 25 * openssl-core@OpenSSL.org. 26 * 27 * 5. Products derived from this software may not be called "OpenSSL" 28 * nor may "OpenSSL" appear in their names without prior written 29 * permission of the OpenSSL Project. 30 * 31 * 6. Redistributions of any form whatsoever must retain the following 32 * acknowledgment: 33 * "This product includes software developed by the OpenSSL Project 34 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 35 * 36 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 37 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 39 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 40 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 41 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 42 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 43 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 45 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 46 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 47 * OF THE POSSIBILITY OF SUCH DAMAGE. 48 * ==================================================================== 49 * 50 * This product includes cryptographic software written by Eric Young 51 * (eay@cryptsoft.com). This product includes software written by Tim 52 * Hudson (tjh@cryptsoft.com). 53 * 54 */ 55 56#include <string.h> 57#include "ecs_locl.h" 58#ifndef OPENSSL_NO_ENGINE 59#include <openssl/engine.h> 60#endif 61#include <openssl/err.h> 62#include <openssl/bn.h> 63 64const char ECDSA_version[]="ECDSA" OPENSSL_VERSION_PTEXT; 65 66static const ECDSA_METHOD *default_ECDSA_method = NULL; 67 68static void *ecdsa_data_new(void); 69static void *ecdsa_data_dup(void *); 70static void ecdsa_data_free(void *); 71 72void ECDSA_set_default_method(const ECDSA_METHOD *meth) 73{ 74 default_ECDSA_method = meth; 75} 76 77const ECDSA_METHOD *ECDSA_get_default_method(void) 78{ 79 if(!default_ECDSA_method) 80 default_ECDSA_method = ECDSA_OpenSSL(); 81 return default_ECDSA_method; 82} 83 84int ECDSA_set_method(EC_KEY *eckey, const ECDSA_METHOD *meth) 85{ 86 ECDSA_DATA *ecdsa; 87 88 ecdsa = ecdsa_check(eckey); 89 90 if (ecdsa == NULL) 91 return 0; 92 93#ifndef OPENSSL_NO_ENGINE 94 if (ecdsa->engine) 95 { 96 ENGINE_finish(ecdsa->engine); 97 ecdsa->engine = NULL; 98 } 99#endif 100 ecdsa->meth = meth; 101 102 return 1; 103} 104 105static ECDSA_DATA *ECDSA_DATA_new_method(ENGINE *engine) 106{ 107 ECDSA_DATA *ret; 108 109 ret=(ECDSA_DATA *)OPENSSL_malloc(sizeof(ECDSA_DATA)); 110 if (ret == NULL) 111 { 112 ECDSAerr(ECDSA_F_ECDSA_DATA_NEW_METHOD, ERR_R_MALLOC_FAILURE); 113 return(NULL); 114 } 115 116 ret->init = NULL; 117 118 ret->meth = ECDSA_get_default_method(); 119 ret->engine = engine; 120#ifndef OPENSSL_NO_ENGINE 121 if (!ret->engine) 122 ret->engine = ENGINE_get_default_ECDSA(); 123 if (ret->engine) 124 { 125 ret->meth = ENGINE_get_ECDSA(ret->engine); 126 if (!ret->meth) 127 { 128 ECDSAerr(ECDSA_F_ECDSA_DATA_NEW_METHOD, ERR_R_ENGINE_LIB); 129 ENGINE_finish(ret->engine); 130 OPENSSL_free(ret); 131 return NULL; 132 } 133 } 134#endif 135 136 ret->flags = ret->meth->flags; 137 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_ECDSA, ret, &ret->ex_data); 138#if 0 139 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) 140 { 141 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDSA, ret, &ret->ex_data); 142 OPENSSL_free(ret); 143 ret=NULL; 144 } 145#endif 146 return(ret); 147} 148 149static void *ecdsa_data_new(void) 150{ 151 return (void *)ECDSA_DATA_new_method(NULL); 152} 153 154static void *ecdsa_data_dup(void *data) 155{ 156 ECDSA_DATA *r = (ECDSA_DATA *)data; 157 158 /* XXX: dummy operation */ 159 if (r == NULL) 160 return NULL; 161 162 return ecdsa_data_new(); 163} 164 165static void ecdsa_data_free(void *data) 166{ 167 ECDSA_DATA *r = (ECDSA_DATA *)data; 168 169#ifndef OPENSSL_NO_ENGINE 170 if (r->engine) 171 ENGINE_finish(r->engine); 172#endif 173 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDSA, r, &r->ex_data); 174 175 OPENSSL_cleanse((void *)r, sizeof(ECDSA_DATA)); 176 177 OPENSSL_free(r); 178} 179 180ECDSA_DATA *ecdsa_check(EC_KEY *key) 181{ 182 ECDSA_DATA *ecdsa_data; 183 184 void *data = EC_KEY_get_key_method_data(key, ecdsa_data_dup, 185 ecdsa_data_free, ecdsa_data_free); 186 if (data == NULL) 187 { 188 ecdsa_data = (ECDSA_DATA *)ecdsa_data_new(); 189 if (ecdsa_data == NULL) 190 return NULL; 191 data = EC_KEY_insert_key_method_data(key, (void *)ecdsa_data, 192 ecdsa_data_dup, ecdsa_data_free, ecdsa_data_free); 193 if (data != NULL) 194 { 195 /* Another thread raced us to install the key_method 196 * data and won. */ 197 ecdsa_data_free(ecdsa_data); 198 ecdsa_data = (ECDSA_DATA *)data; 199 } 200 } 201 else 202 ecdsa_data = (ECDSA_DATA *)data; 203 204 205 return ecdsa_data; 206} 207 208int ECDSA_size(const EC_KEY *r) 209{ 210 int ret,i; 211 ASN1_INTEGER bs; 212 BIGNUM *order=NULL; 213 unsigned char buf[4]; 214 const EC_GROUP *group; 215 216 if (r == NULL) 217 return 0; 218 group = EC_KEY_get0_group(r); 219 if (group == NULL) 220 return 0; 221 222 if ((order = BN_new()) == NULL) return 0; 223 if (!EC_GROUP_get_order(group,order,NULL)) 224 { 225 BN_clear_free(order); 226 return 0; 227 } 228 i=BN_num_bits(order); 229 bs.length=(i+7)/8; 230 bs.data=buf; 231 bs.type=V_ASN1_INTEGER; 232 /* If the top bit is set the asn1 encoding is 1 larger. */ 233 buf[0]=0xff; 234 235 i=i2d_ASN1_INTEGER(&bs,NULL); 236 i+=i; /* r and s */ 237 ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE); 238 BN_clear_free(order); 239 return(ret); 240} 241 242 243int ECDSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 244 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 245{ 246 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_ECDSA, argl, argp, 247 new_func, dup_func, free_func); 248} 249 250int ECDSA_set_ex_data(EC_KEY *d, int idx, void *arg) 251{ 252 ECDSA_DATA *ecdsa; 253 ecdsa = ecdsa_check(d); 254 if (ecdsa == NULL) 255 return 0; 256 return(CRYPTO_set_ex_data(&ecdsa->ex_data,idx,arg)); 257} 258 259void *ECDSA_get_ex_data(EC_KEY *d, int idx) 260{ 261 ECDSA_DATA *ecdsa; 262 ecdsa = ecdsa_check(d); 263 if (ecdsa == NULL) 264 return NULL; 265 return(CRYPTO_get_ex_data(&ecdsa->ex_data,idx)); 266} 267