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 64 const char ECDSA_version[]="ECDSA" OPENSSL_VERSION_PTEXT; 65 66 static const ECDSA_METHOD *default_ECDSA_method = NULL; 67 68 static void *ecdsa_data_new(void); 69 static void *ecdsa_data_dup(void *); 70 static void ecdsa_data_free(void *); 71 72 void ECDSA_set_default_method(const ECDSA_METHOD *meth) 73 { 74 default_ECDSA_method = meth; 75 } 76 77 const 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 84 int 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 } 104 105 static 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 } 148 149 static void *ecdsa_data_new(void) 150 { 151 return (void *)ECDSA_DATA_new_method(NULL); 152 } 153 154 static 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 } 164 165 static 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 } 179 180 ECDSA_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 EC_KEY_insert_key_method_data(key, (void *)ecdsa_data, 192 ecdsa_data_dup, ecdsa_data_free, ecdsa_data_free); 193 } 194 else 195 ecdsa_data = (ECDSA_DATA *)data; 196 197 198 return ecdsa_data; 199 } 200 201 int ECDSA_size(const EC_KEY *r) 202 { 203 int ret,i; 204 ASN1_INTEGER bs; 205 BIGNUM *order=NULL; 206 unsigned char buf[4]; 207 const EC_GROUP *group; 208 209 if (r == NULL) 210 return 0; 211 group = EC_KEY_get0_group(r); 212 if (group == NULL) 213 return 0; 214 215 if ((order = BN_new()) == NULL) return 0; 216 if (!EC_GROUP_get_order(group,order,NULL)) 217 { 218 BN_clear_free(order); 219 return 0; 220 } 221 i=BN_num_bits(order); 222 bs.length=(i+7)/8; 223 bs.data=buf; 224 bs.type=V_ASN1_INTEGER; 225 /* If the top bit is set the asn1 encoding is 1 larger. */ 226 buf[0]=0xff; 227 228 i=i2d_ASN1_INTEGER(&bs,NULL); 229 i+=i; /* r and s */ 230 ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE); 231 BN_clear_free(order); 232 return(ret); 233 } 234 235 236 int ECDSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 237 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 238 { 239 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_ECDSA, argl, argp, 240 new_func, dup_func, free_func); 241 } 242 243 int ECDSA_set_ex_data(EC_KEY *d, int idx, void *arg) 244 { 245 ECDSA_DATA *ecdsa; 246 ecdsa = ecdsa_check(d); 247 if (ecdsa == NULL) 248 return 0; 249 return(CRYPTO_set_ex_data(&ecdsa->ex_data,idx,arg)); 250 } 251 252 void *ECDSA_get_ex_data(EC_KEY *d, int idx) 253 { 254 ECDSA_DATA *ecdsa; 255 ecdsa = ecdsa_check(d); 256 if (ecdsa == NULL) 257 return NULL; 258 return(CRYPTO_get_ex_data(&ecdsa->ex_data,idx)); 259 } 260
