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 const ECDSA_METHOD *mtmp; 87 ECDSA_DATA *ecdsa; 88 89 ecdsa = ecdsa_check(eckey); 90 91 if (ecdsa == NULL) 92 return 0; 93 94 mtmp = ecdsa->meth; 95 #ifndef OPENSSL_NO_ENGINE 96 if (ecdsa->engine) 97 { 98 ENGINE_finish(ecdsa->engine); 99 ecdsa->engine = NULL; 100 } 101 #endif 102 ecdsa->meth = meth; 103 104 return 1; 105 } 106 107 static ECDSA_DATA *ECDSA_DATA_new_method(ENGINE *engine) 108 { 109 ECDSA_DATA *ret; 110 111 ret=(ECDSA_DATA *)OPENSSL_malloc(sizeof(ECDSA_DATA)); 112 if (ret == NULL) 113 { 114 ECDSAerr(ECDSA_F_ECDSA_DATA_NEW_METHOD, ERR_R_MALLOC_FAILURE); 115 return(NULL); 116 } 117 118 ret->init = NULL; 119 120 ret->meth = ECDSA_get_default_method(); 121 ret->engine = engine; 122 #ifndef OPENSSL_NO_ENGINE 123 if (!ret->engine) 124 ret->engine = ENGINE_get_default_ECDSA(); 125 if (ret->engine) 126 { 127 ret->meth = ENGINE_get_ECDSA(ret->engine); 128 if (!ret->meth) 129 { 130 ECDSAerr(ECDSA_F_ECDSA_DATA_NEW_METHOD, ERR_R_ENGINE_LIB); 131 ENGINE_finish(ret->engine); 132 OPENSSL_free(ret); 133 return NULL; 134 } 135 } 136 #endif 137 138 ret->flags = ret->meth->flags; 139 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_ECDSA, ret, &ret->ex_data); 140 #if 0 141 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) 142 { 143 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDSA, ret, &ret->ex_data); 144 OPENSSL_free(ret); 145 ret=NULL; 146 } 147 #endif 148 return(ret); 149 } 150 151 static void *ecdsa_data_new(void) 152 { 153 return (void *)ECDSA_DATA_new_method(NULL); 154 } 155 156 static void *ecdsa_data_dup(void *data) 157 { 158 ECDSA_DATA *r = (ECDSA_DATA *)data; 159 160 /* XXX: dummy operation */ 161 if (r == NULL) 162 return NULL; 163 164 return ecdsa_data_new(); 165 } 166 167 static void ecdsa_data_free(void *data) 168 { 169 ECDSA_DATA *r = (ECDSA_DATA *)data; 170 171 #ifndef OPENSSL_NO_ENGINE 172 if (r->engine) 173 ENGINE_finish(r->engine); 174 #endif 175 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDSA, r, &r->ex_data); 176 177 OPENSSL_cleanse((void *)r, sizeof(ECDSA_DATA)); 178 179 OPENSSL_free(r); 180 } 181 182 ECDSA_DATA *ecdsa_check(EC_KEY *key) 183 { 184 ECDSA_DATA *ecdsa_data; 185 186 void *data = EC_KEY_get_key_method_data(key, ecdsa_data_dup, 187 ecdsa_data_free, ecdsa_data_free); 188 if (data == NULL) 189 { 190 ecdsa_data = (ECDSA_DATA *)ecdsa_data_new(); 191 if (ecdsa_data == NULL) 192 return NULL; 193 EC_KEY_insert_key_method_data(key, (void *)ecdsa_data, 194 ecdsa_data_dup, ecdsa_data_free, ecdsa_data_free); 195 } 196 else 197 ecdsa_data = (ECDSA_DATA *)data; 198 199 200 return ecdsa_data; 201 } 202 203 int ECDSA_size(const EC_KEY *r) 204 { 205 int ret,i; 206 ASN1_INTEGER bs; 207 BIGNUM *order=NULL; 208 unsigned char buf[4]; 209 const EC_GROUP *group; 210 211 if (r == NULL) 212 return 0; 213 group = EC_KEY_get0_group(r); 214 if (group == NULL) 215 return 0; 216 217 if ((order = BN_new()) == NULL) return 0; 218 if (!EC_GROUP_get_order(group,order,NULL)) 219 { 220 BN_clear_free(order); 221 return 0; 222 } 223 i=BN_num_bits(order); 224 bs.length=(i+7)/8; 225 bs.data=buf; 226 bs.type=V_ASN1_INTEGER; 227 /* If the top bit is set the asn1 encoding is 1 larger. */ 228 buf[0]=0xff; 229 230 i=i2d_ASN1_INTEGER(&bs,NULL); 231 i+=i; /* r and s */ 232 ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE); 233 BN_clear_free(order); 234 return(ret); 235 } 236 237 238 int ECDSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 239 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 240 { 241 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_ECDSA, argl, argp, 242 new_func, dup_func, free_func); 243 } 244 245 int ECDSA_set_ex_data(EC_KEY *d, int idx, void *arg) 246 { 247 ECDSA_DATA *ecdsa; 248 ecdsa = ecdsa_check(d); 249 if (ecdsa == NULL) 250 return 0; 251 return(CRYPTO_set_ex_data(&ecdsa->ex_data,idx,arg)); 252 } 253 254 void *ECDSA_get_ex_data(EC_KEY *d, int idx) 255 { 256 ECDSA_DATA *ecdsa; 257 ecdsa = ecdsa_check(d); 258 if (ecdsa == NULL) 259 return NULL; 260 return(CRYPTO_get_ex_data(&ecdsa->ex_data,idx)); 261 } 262
