Logo Search packages:      
Sourcecode: openssl version File versions  Download package

ecs_lib.c

/* crypto/ecdsa/ecs_lib.c */
/* ====================================================================
 * Copyright (c) 1998-2005 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    openssl-core@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

#include <string.h>
#include "ecs_locl.h"
#ifndef OPENSSL_NO_ENGINE
#include <openssl/engine.h>
#endif
#include <openssl/err.h>
#include <openssl/bn.h>

const char ECDSA_version[]="ECDSA" OPENSSL_VERSION_PTEXT;

static const ECDSA_METHOD *default_ECDSA_method = NULL;

static void *ecdsa_data_new(void);
static void *ecdsa_data_dup(void *);
static void  ecdsa_data_free(void *);

00072 void ECDSA_set_default_method(const ECDSA_METHOD *meth)
{
      default_ECDSA_method = meth;
}

00077 const ECDSA_METHOD *ECDSA_get_default_method(void)
{
      if(!default_ECDSA_method) 
            default_ECDSA_method = ECDSA_OpenSSL();
      return default_ECDSA_method;
}

00084 int ECDSA_set_method(EC_KEY *eckey, const ECDSA_METHOD *meth)
{
      ECDSA_DATA *ecdsa;

      ecdsa = ecdsa_check(eckey);

      if (ecdsa == NULL)
            return 0;

#ifndef OPENSSL_NO_ENGINE
      if (ecdsa->engine)
      {
            ENGINE_finish(ecdsa->engine);
            ecdsa->engine = NULL;
      }
#endif
        ecdsa->meth = meth;

        return 1;
}

static ECDSA_DATA *ECDSA_DATA_new_method(ENGINE *engine)
{
      ECDSA_DATA *ret;

      ret=(ECDSA_DATA *)OPENSSL_malloc(sizeof(ECDSA_DATA));
      if (ret == NULL)
      {
            ECDSAerr(ECDSA_F_ECDSA_DATA_NEW_METHOD, ERR_R_MALLOC_FAILURE);
            return(NULL);
      }

      ret->init = NULL;

      ret->meth = ECDSA_get_default_method();
      ret->engine = engine;
#ifndef OPENSSL_NO_ENGINE
      if (!ret->engine)
            ret->engine = ENGINE_get_default_ECDSA();
      if (ret->engine)
      {
            ret->meth = ENGINE_get_ECDSA(ret->engine);
            if (!ret->meth)
            {
                  ECDSAerr(ECDSA_F_ECDSA_DATA_NEW_METHOD, ERR_R_ENGINE_LIB);
                  ENGINE_finish(ret->engine);
                  OPENSSL_free(ret);
                  return NULL;
            }
      }
#endif

      ret->flags = ret->meth->flags;
      CRYPTO_new_ex_data(CRYPTO_EX_INDEX_ECDSA, ret, &ret->ex_data);
#if 0
      if ((ret->meth->init != NULL) && !ret->meth->init(ret))
      {
            CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDSA, ret, &ret->ex_data);
            OPENSSL_free(ret);
            ret=NULL;
      }
#endif      
      return(ret);
}

static void *ecdsa_data_new(void)
{
      return (void *)ECDSA_DATA_new_method(NULL);
}

static void *ecdsa_data_dup(void *data)
{
      ECDSA_DATA *r = (ECDSA_DATA *)data;

      /* XXX: dummy operation */
      if (r == NULL)
            return NULL;

      return ecdsa_data_new();
}

static void ecdsa_data_free(void *data)
{
      ECDSA_DATA *r = (ECDSA_DATA *)data;

#ifndef OPENSSL_NO_ENGINE
      if (r->engine)
            ENGINE_finish(r->engine);
#endif
      CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDSA, r, &r->ex_data);

      OPENSSL_cleanse((void *)r, sizeof(ECDSA_DATA));

      OPENSSL_free(r);
}

ECDSA_DATA *ecdsa_check(EC_KEY *key)
{
      ECDSA_DATA *ecdsa_data;
 
      void *data = EC_KEY_get_key_method_data(key, ecdsa_data_dup,
                              ecdsa_data_free, ecdsa_data_free);
      if (data == NULL)
      {
            ecdsa_data = (ECDSA_DATA *)ecdsa_data_new();
            if (ecdsa_data == NULL)
                  return NULL;
            EC_KEY_insert_key_method_data(key, (void *)ecdsa_data,
                  ecdsa_data_dup, ecdsa_data_free, ecdsa_data_free);
      }
      else
            ecdsa_data = (ECDSA_DATA *)data;
      

      return ecdsa_data;
}

00201 int ECDSA_size(const EC_KEY *r)
{
      int ret,i;
      ASN1_INTEGER bs;
      BIGNUM      *order=NULL;
      unsigned char buf[4];
      const EC_GROUP *group;

      if (r == NULL)
            return 0;
      group = EC_KEY_get0_group(r);
      if (group == NULL)
            return 0;

      if ((order = BN_new()) == NULL) return 0;
      if (!EC_GROUP_get_order(group,order,NULL))
      {
            BN_clear_free(order);
            return 0;
      } 
      i=BN_num_bits(order);
      bs.length=(i+7)/8;
      bs.data=buf;
      bs.type=V_ASN1_INTEGER;
      /* If the top bit is set the asn1 encoding is 1 larger. */
      buf[0]=0xff;      

      i=i2d_ASN1_INTEGER(&bs,NULL);
      i+=i; /* r and s */
      ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE);
      BN_clear_free(order);
      return(ret);
}


int ECDSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
           CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
{
      return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_ECDSA, argl, argp,
                        new_func, dup_func, free_func);
}

int ECDSA_set_ex_data(EC_KEY *d, int idx, void *arg)
{
      ECDSA_DATA *ecdsa;
      ecdsa = ecdsa_check(d);
      if (ecdsa == NULL)
            return 0;
      return(CRYPTO_set_ex_data(&ecdsa->ex_data,idx,arg));
}

void *ECDSA_get_ex_data(EC_KEY *d, int idx)
{
      ECDSA_DATA *ecdsa;
      ecdsa = ecdsa_check(d);
      if (ecdsa == NULL)
            return NULL;
      return(CRYPTO_get_ex_data(&ecdsa->ex_data,idx));
}

Generated by  Doxygen 1.6.0   Back to index