crypto/ecdsa/ecs_lib.c

   1 /* crypto/ecdsa/ecs_lib.c */
   2 /* ====================================================================
   3  * Copyright (c) 1998-2002 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 "ecdsa.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 void ecdsa_finish(EC_KEY *);
  67
  68 static const ECDSA_METHOD *default_ECDSA_method = NULL;
  69
  70 void ECDSA_set_default_method(const ECDSA_METHOD *meth)
  71 {
  72         default_ECDSA_method = meth;
  73 }
  74
  75 const ECDSA_METHOD *ECDSA_get_default_method(void)
  76 {
  77         if(!default_ECDSA_method)
  78                 default_ECDSA_method = ECDSA_OpenSSL();
  79         return default_ECDSA_method;
  80 }
  81
  82 int ECDSA_set_method(EC_KEY *eckey, const ECDSA_METHOD *meth)
  83 {
  84         const ECDSA_METHOD *mtmp;
  85         ECDSA_DATA *ecdsa;
  86
  87         ecdsa = ecdsa_check(eckey);
  88
  89         if (ecdsa == NULL)
  90                 return 0;
  91
  92         mtmp = ecdsa->meth;
  93 #if 0
  94         if (mtmp->finish)
  95                 mtmp->finish(eckey);
  96 #endif
  97 #ifndef OPENSSL_NO_ENGINE
  98         if (ecdsa->engine)
  99         {
 100                 ENGINE_finish(ecdsa->engine);
 101                 ecdsa->engine = NULL;
 102         }
 103 #endif
 104         ecdsa->meth = meth;
 105 #if 0
 106         if (meth->init)
 107                 meth->init(eckey);
 108 #endif
 109         return 1;
 110 }
 111
 112 ECDSA_DATA *ECDSA_DATA_new(void)
 113 {
 114         return ECDSA_DATA_new_method(NULL);
 115 }
 116
 117 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, ERR_R_MALLOC_FAILURE);
 125                 return(NULL);
 126         }
 127
 128         ret->init = NULL;
 129         ret->finish = ecdsa_finish;
 130
 131         ret->kinv = NULL;
 132         ret->r    = NULL;
 133
 134         ret->meth = ECDSA_get_default_method();
 135         ret->engine = engine;
 136 #ifndef OPENSSL_NO_ENGINE
 137         if (!ret->engine)
 138                 ret->engine = ENGINE_get_default_ECDSA();
 139         if (ret->engine)
 140         {
 141                 ret->meth = ENGINE_get_ECDSA(ret->engine);
 142                 if (!ret->meth)
 143                 {
 144                         ECDSAerr(ECDSA_F_ECDSA_DATA_NEW, ERR_R_ENGINE_LIB);
 145                         ENGINE_finish(ret->engine);
 146                         OPENSSL_free(ret);
 147                         return NULL;
 148                 }
 149         }
 150 #endif
 151
 152         ret->flags = ret->meth->flags;
 153         CRYPTO_new_ex_data(CRYPTO_EX_INDEX_ECDSA, ret, &ret->ex_data);
 154 #if 0
 155         if ((ret->meth->init != NULL) && !ret->meth->init(ret))
 156         {
 157                 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDSA, ret, &ret->ex_data);
 158                 OPENSSL_free(ret);
 159                 ret=NULL;
 160         }
 161 #endif
 162         return(ret);
 163 }
 164
 165 void ECDSA_DATA_free(ECDSA_DATA *r)
 166 {
 167         if (r->kinv)
 168                 BN_clear_free(r->kinv);
 169         if (r->r)
 170                 BN_clear_free(r->r);
 171
 172 #if 0
 173         if (r->meth->finish)
 174                 r->meth->finish(r);
 175 #endif
 176 #ifndef OPENSSL_NO_ENGINE
 177         if (r->engine)
 178                 ENGINE_finish(r->engine);
 179 #endif
 180
 181         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDSA, r, &r->ex_data);
 182
 183         OPENSSL_cleanse((void *)r, sizeof(ECDSA_DATA));
 184
 185         OPENSSL_free(r);
 186 }
 187
 188 ECDSA_DATA *ecdsa_check(EC_KEY *key)
 189 {
 190         if (key->meth_data)
 191         {
 192                 if (key->meth_data->finish != ecdsa_finish)
 193                 {
 194                         key->meth_data->finish(key);
 195                         key->meth_data = (EC_KEY_METH_DATA *)ECDSA_DATA_new();
 196                 }
 197         }
 198         else
 199                 key->meth_data = (EC_KEY_METH_DATA *)ECDSA_DATA_new();
 200         return (ECDSA_DATA *)key->meth_data;
 201 }
 202
 203 static void ecdsa_finish(EC_KEY *key)
 204 {
 205         if (key->meth_data && key->meth_data->finish == ecdsa_finish)
 206                 ECDSA_DATA_free((ECDSA_DATA *)key->meth_data);
 207 }
 208
 209 int ECDSA_size(const EC_KEY *r)
 210 {
 211         int ret,i;
 212         ASN1_INTEGER bs;
 213         BIGNUM  *order=NULL;
 214         unsigned char buf[4];
 215
 216         if (r == NULL || r->group == NULL)
 217                 return 0;
 218         if ((order = BN_new()) == NULL) return 0;
 219         if (!EC_GROUP_get_order(r->group,order,NULL))
 220         {
 221                 BN_clear_free(order);
 222                 return 0;
 223         }
 224         i=BN_num_bits(order);
 225         bs.length=(i+7)/8;
 226         bs.data=buf;
 227         bs.type=V_ASN1_INTEGER;
 228         /* If the top bit is set the asn1 encoding is 1 larger. */
 229         buf[0]=0xff;
 230
 231         i=i2d_ASN1_INTEGER(&bs,NULL);
 232         i+=i; /* r and s */
 233         ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE);
 234         BN_clear_free(order);
 235         return(ret);
 236 }
 237
 238
 239 int ECDSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
 240              CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
 241 {
 242         return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_ECDSA, argl, argp,
 243                                 new_func, dup_func, free_func);
 244 }
 245
 246 int ECDSA_set_ex_data(EC_KEY *d, int idx, void *arg)
 247 {
 248         ECDSA_DATA *ecdsa;
 249         ecdsa = ecdsa_check(d);
 250         if (ecdsa == NULL)
 251                 return 0;
 252         return(CRYPTO_set_ex_data(&ecdsa->ex_data,idx,arg));
 253 }
 254
 255 void *ECDSA_get_ex_data(EC_KEY *d, int idx)
 256 {
 257         ECDSA_DATA *ecdsa;
 258         ecdsa = ecdsa_check(d);
 259         if (ecdsa == NULL)
 260                 return NULL;
 261         return(CRYPTO_get_ex_data(&ecdsa->ex_data,idx));
 262 }