1 /* $OpenBSD: ecs_lib.c,v 1.13 2018/04/14 07:09:21 tb Exp $ */ 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 58 #include <openssl/opensslconf.h> 59 60 #include "ecs_locl.h" 61 #ifndef OPENSSL_NO_ENGINE 62 #include <openssl/engine.h> 63 #endif 64 #include <openssl/err.h> 65 #include <openssl/bn.h> 66 67 static const ECDSA_METHOD *default_ECDSA_method = NULL; 68 69 static void *ecdsa_data_new(void); 70 static void *ecdsa_data_dup(void *); 71 static void ecdsa_data_free(void *); 72 73 void 74 ECDSA_set_default_method(const ECDSA_METHOD *meth) 75 { 76 default_ECDSA_method = meth; 77 } 78 79 const ECDSA_METHOD * 80 ECDSA_get_default_method(void) 81 { 82 if (!default_ECDSA_method) { 83 default_ECDSA_method = ECDSA_OpenSSL(); 84 } 85 return default_ECDSA_method; 86 } 87 88 int 89 ECDSA_set_method(EC_KEY *eckey, const ECDSA_METHOD *meth) 90 { 91 ECDSA_DATA *ecdsa; 92 93 ecdsa = ecdsa_check(eckey); 94 95 if (ecdsa == NULL) 96 return 0; 97 98 #ifndef OPENSSL_NO_ENGINE 99 ENGINE_finish(ecdsa->engine); 100 ecdsa->engine = NULL; 101 #endif 102 ecdsa->meth = meth; 103 104 return 1; 105 } 106 107 static ECDSA_DATA * 108 ECDSA_DATA_new_method(ENGINE *engine) 109 { 110 ECDSA_DATA *ret; 111 112 ret = malloc(sizeof(ECDSA_DATA)); 113 if (ret == NULL) { 114 ECDSAerror(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 ret->meth = ENGINE_get_ECDSA(ret->engine); 127 if (ret->meth == NULL) { 128 ECDSAerror(ERR_R_ENGINE_LIB); 129 ENGINE_finish(ret->engine); 130 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 return (ret); 139 } 140 141 static void * 142 ecdsa_data_new(void) 143 { 144 return (void *)ECDSA_DATA_new_method(NULL); 145 } 146 147 static void * 148 ecdsa_data_dup(void *data) 149 { 150 ECDSA_DATA *r = (ECDSA_DATA *)data; 151 152 /* XXX: dummy operation */ 153 if (r == NULL) 154 return NULL; 155 156 return ecdsa_data_new(); 157 } 158 159 static void 160 ecdsa_data_free(void *data) 161 { 162 ECDSA_DATA *r = (ECDSA_DATA *)data; 163 164 #ifndef OPENSSL_NO_ENGINE 165 ENGINE_finish(r->engine); 166 #endif 167 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDSA, r, &r->ex_data); 168 169 freezero(r, sizeof(ECDSA_DATA)); 170 } 171 172 ECDSA_DATA * 173 ecdsa_check(EC_KEY *key) 174 { 175 ECDSA_DATA *ecdsa_data; 176 177 void *data = EC_KEY_get_key_method_data(key, ecdsa_data_dup, 178 ecdsa_data_free, ecdsa_data_free); 179 if (data == NULL) { 180 ecdsa_data = (ECDSA_DATA *)ecdsa_data_new(); 181 if (ecdsa_data == NULL) 182 return NULL; 183 data = EC_KEY_insert_key_method_data(key, (void *)ecdsa_data, 184 ecdsa_data_dup, ecdsa_data_free, ecdsa_data_free); 185 if (data != NULL) { 186 /* Another thread raced us to install the key_method 187 * data and won. */ 188 ecdsa_data_free(ecdsa_data); 189 ecdsa_data = (ECDSA_DATA *)data; 190 } 191 } else 192 ecdsa_data = (ECDSA_DATA *)data; 193 194 return ecdsa_data; 195 } 196 197 int 198 ECDSA_size(const EC_KEY *r) 199 { 200 int ret, i; 201 ASN1_INTEGER bs; 202 BIGNUM *order = NULL; 203 unsigned char buf[4]; 204 const EC_GROUP *group; 205 206 if (r == NULL) 207 return 0; 208 group = EC_KEY_get0_group(r); 209 if (group == NULL) 210 return 0; 211 212 if ((order = BN_new()) == NULL) 213 return 0; 214 if (!EC_GROUP_get_order(group, order, NULL)) { 215 BN_clear_free(order); 216 return 0; 217 } 218 i = BN_num_bits(order); 219 bs.length = (i + 7) / 8; 220 bs.data = buf; 221 bs.type = V_ASN1_INTEGER; 222 /* If the top bit is set the asn1 encoding is 1 larger. */ 223 buf[0] = 0xff; 224 225 i = i2d_ASN1_INTEGER(&bs, NULL); 226 i += i; /* r and s */ 227 ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE); 228 BN_clear_free(order); 229 return (ret); 230 } 231 232 int 233 ECDSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 234 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 235 { 236 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_ECDSA, argl, argp, 237 new_func, dup_func, free_func); 238 } 239 240 int 241 ECDSA_set_ex_data(EC_KEY *d, int idx, void *arg) 242 { 243 ECDSA_DATA *ecdsa; 244 ecdsa = ecdsa_check(d); 245 if (ecdsa == NULL) 246 return 0; 247 return (CRYPTO_set_ex_data(&ecdsa->ex_data, idx, arg)); 248 } 249 250 void * 251 ECDSA_get_ex_data(EC_KEY *d, int idx) 252 { 253 ECDSA_DATA *ecdsa; 254 ecdsa = ecdsa_check(d); 255 if (ecdsa == NULL) 256 return NULL; 257 return (CRYPTO_get_ex_data(&ecdsa->ex_data, idx)); 258 } 259