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 (at) 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 (at) cryptsoft.com). This product includes software written by Tim 52 * Hudson (tjh (at) 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 #ifdef OPENSSL_FIPS 64 #include <openssl/fips.h> 65 #endif 66 67 const char ECDSA_version[]="ECDSA" OPENSSL_VERSION_PTEXT; 68 69 static const ECDSA_METHOD *default_ECDSA_method = NULL; 70 71 static void *ecdsa_data_new(void); 72 static void *ecdsa_data_dup(void *); 73 static void ecdsa_data_free(void *); 74 75 void ECDSA_set_default_method(const ECDSA_METHOD *meth) 76 { 77 default_ECDSA_method = meth; 78 } 79 80 const ECDSA_METHOD *ECDSA_get_default_method(void) 81 { 82 if(!default_ECDSA_method) 83 { 84 #ifdef OPENSSL_FIPS 85 if (FIPS_mode()) 86 return FIPS_ecdsa_openssl(); 87 else 88 return ECDSA_OpenSSL(); 89 #else 90 default_ECDSA_method = ECDSA_OpenSSL(); 91 #endif 92 } 93 return default_ECDSA_method; 94 } 95 96 int ECDSA_set_method(EC_KEY *eckey, const ECDSA_METHOD *meth) 97 { 98 ECDSA_DATA *ecdsa; 99 100 ecdsa = ecdsa_check(eckey); 101 102 if (ecdsa == NULL) 103 return 0; 104 105 #ifndef OPENSSL_NO_ENGINE 106 if (ecdsa->engine) 107 { 108 ENGINE_finish(ecdsa->engine); 109 ecdsa->engine = NULL; 110 } 111 #endif 112 ecdsa->meth = meth; 113 114 return 1; 115 } 116 117 static ECDSA_DATA *ECDSA_DATA_new_method(ENGINE *engine) 118 { 119 ECDSA_DATA *ret; 120 121 ret=(ECDSA_DATA *)OPENSSL_malloc(sizeof(ECDSA_DATA)); 122 if (ret == NULL) 123 { 124 ECDSAerr(ECDSA_F_ECDSA_DATA_NEW_METHOD, ERR_R_MALLOC_FAILURE); 125 return(NULL); 126 } 127 128 ret->init = NULL; 129 130 ret->meth = ECDSA_get_default_method(); 131 ret->engine = engine; 132 #ifndef OPENSSL_NO_ENGINE 133 if (!ret->engine) 134 ret->engine = ENGINE_get_default_ECDSA(); 135 if (ret->engine) 136 { 137 ret->meth = ENGINE_get_ECDSA(ret->engine); 138 if (!ret->meth) 139 { 140 ECDSAerr(ECDSA_F_ECDSA_DATA_NEW_METHOD, ERR_R_ENGINE_LIB); 141 ENGINE_finish(ret->engine); 142 OPENSSL_free(ret); 143 return NULL; 144 } 145 } 146 #endif 147 148 ret->flags = ret->meth->flags; 149 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_ECDSA, ret, &ret->ex_data); 150 #if 0 151 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) 152 { 153 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDSA, ret, &ret->ex_data); 154 OPENSSL_free(ret); 155 ret=NULL; 156 } 157 #endif 158 return(ret); 159 } 160 161 static void *ecdsa_data_new(void) 162 { 163 return (void *)ECDSA_DATA_new_method(NULL); 164 } 165 166 static void *ecdsa_data_dup(void *data) 167 { 168 ECDSA_DATA *r = (ECDSA_DATA *)data; 169 170 /* XXX: dummy operation */ 171 if (r == NULL) 172 return NULL; 173 174 return ecdsa_data_new(); 175 } 176 177 static void ecdsa_data_free(void *data) 178 { 179 ECDSA_DATA *r = (ECDSA_DATA *)data; 180 181 #ifndef OPENSSL_NO_ENGINE 182 if (r->engine) 183 ENGINE_finish(r->engine); 184 #endif 185 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDSA, r, &r->ex_data); 186 187 OPENSSL_cleanse((void *)r, sizeof(ECDSA_DATA)); 188 189 OPENSSL_free(r); 190 } 191 192 ECDSA_DATA *ecdsa_check(EC_KEY *key) 193 { 194 ECDSA_DATA *ecdsa_data; 195 196 void *data = EC_KEY_get_key_method_data(key, ecdsa_data_dup, 197 ecdsa_data_free, ecdsa_data_free); 198 if (data == NULL) 199 { 200 ecdsa_data = (ECDSA_DATA *)ecdsa_data_new(); 201 if (ecdsa_data == NULL) 202 return NULL; 203 data = EC_KEY_insert_key_method_data(key, (void *)ecdsa_data, 204 ecdsa_data_dup, ecdsa_data_free, ecdsa_data_free); 205 if (data != NULL) 206 { 207 /* Another thread raced us to install the key_method 208 * data and won. */ 209 ecdsa_data_free(ecdsa_data); 210 ecdsa_data = (ECDSA_DATA *)data; 211 } 212 } 213 else 214 ecdsa_data = (ECDSA_DATA *)data; 215 #ifdef OPENSSL_FIPS 216 if (FIPS_mode() && !(ecdsa_data->flags & ECDSA_FLAG_FIPS_METHOD) 217 && !(EC_KEY_get_flags(key) & EC_FLAG_NON_FIPS_ALLOW)) 218 { 219 ECDSAerr(ECDSA_F_ECDSA_CHECK, ECDSA_R_NON_FIPS_METHOD); 220 return NULL; 221 } 222 #endif 223 224 return ecdsa_data; 225 } 226 227 int ECDSA_size(const EC_KEY *r) 228 { 229 int ret,i; 230 ASN1_INTEGER bs; 231 BIGNUM *order=NULL; 232 unsigned char buf[4]; 233 const EC_GROUP *group; 234 235 if (r == NULL) 236 return 0; 237 group = EC_KEY_get0_group(r); 238 if (group == NULL) 239 return 0; 240 241 if ((order = BN_new()) == NULL) return 0; 242 if (!EC_GROUP_get_order(group,order,NULL)) 243 { 244 BN_clear_free(order); 245 return 0; 246 } 247 i=BN_num_bits(order); 248 bs.length=(i+7)/8; 249 bs.data=buf; 250 bs.type=V_ASN1_INTEGER; 251 /* If the top bit is set the asn1 encoding is 1 larger. */ 252 buf[0]=0xff; 253 254 i=i2d_ASN1_INTEGER(&bs,NULL); 255 i+=i; /* r and s */ 256 ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE); 257 BN_clear_free(order); 258 return(ret); 259 } 260 261 262 int ECDSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 263 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 264 { 265 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_ECDSA, argl, argp, 266 new_func, dup_func, free_func); 267 } 268 269 int ECDSA_set_ex_data(EC_KEY *d, int idx, void *arg) 270 { 271 ECDSA_DATA *ecdsa; 272 ecdsa = ecdsa_check(d); 273 if (ecdsa == NULL) 274 return 0; 275 return(CRYPTO_set_ex_data(&ecdsa->ex_data,idx,arg)); 276 } 277 278 void *ECDSA_get_ex_data(EC_KEY *d, int idx) 279 { 280 ECDSA_DATA *ecdsa; 281 ecdsa = ecdsa_check(d); 282 if (ecdsa == NULL) 283 return NULL; 284 return(CRYPTO_get_ex_data(&ecdsa->ex_data,idx)); 285 } 286
