Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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> |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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) |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 80 | default_ECDSA_method = ECDSA_OpenSSL(); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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; |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 196 | |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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 | } |