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ec_key.c
/* crypto/ec/ec_key.c */
/*
 * Written by Nils Larsch for the OpenSSL project.
 */
/* ====================================================================
 * 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).
 *
 */
/* ====================================================================
 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 * Portions originally developed by SUN MICROSYSTEMS, INC., and 
 * contributed to the OpenSSL project.
 */

#include <string.h>
#include "ec_lcl.h"
#include <openssl/err.h>
#include <string.h>

00069 EC_KEY *EC_KEY_new(void)
      {
      EC_KEY *ret;

      ret=(EC_KEY *)OPENSSL_malloc(sizeof(EC_KEY));
      if (ret == NULL)
            {
            ECerr(EC_F_EC_KEY_NEW, ERR_R_MALLOC_FAILURE);
            return(NULL);
            }

      ret->version = 1; 
      ret->group   = NULL;
      ret->pub_key = NULL;
      ret->priv_key= NULL;
      ret->enc_flag= 0; 
      ret->conv_form = POINT_CONVERSION_UNCOMPRESSED;
      ret->references= 1;
      ret->method_data = NULL;
      return(ret);
      }

00091 EC_KEY *EC_KEY_new_by_curve_name(int nid)
      {
      EC_KEY *ret = EC_KEY_new();
      if (ret == NULL)
            return NULL;
      ret->group = EC_GROUP_new_by_curve_name(nid);
      if (ret->group == NULL)
            {
            EC_KEY_free(ret);
            return NULL;
            }
      return ret;
      }

00105 void EC_KEY_free(EC_KEY *r)
      {
      int i;

      if (r == NULL) return;

      i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_EC);
#ifdef REF_PRINT
      REF_PRINT("EC_KEY",r);
#endif
      if (i > 0) return;
#ifdef REF_CHECK
      if (i < 0)
            {
            fprintf(stderr,"EC_KEY_free, bad reference count\n");
            abort();
            }
#endif

      if (r->group    != NULL) 
            EC_GROUP_free(r->group);
      if (r->pub_key  != NULL)
            EC_POINT_free(r->pub_key);
      if (r->priv_key != NULL)
            BN_clear_free(r->priv_key);

      EC_EX_DATA_free_all_data(&r->method_data);

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

      OPENSSL_free(r);
      }

00138 EC_KEY *EC_KEY_copy(EC_KEY *dest, const EC_KEY *src)
      {
      EC_EXTRA_DATA *d;

      if (dest == NULL || src == NULL)
            {
            ECerr(EC_F_EC_KEY_COPY, ERR_R_PASSED_NULL_PARAMETER);
            return NULL;
            }
      /* copy the parameters */
      if (src->group)
            {
            const EC_METHOD *meth = EC_GROUP_method_of(src->group);
            /* clear the old group */
            if (dest->group)
                  EC_GROUP_free(dest->group);
            dest->group = EC_GROUP_new(meth);
            if (dest->group == NULL)
                  return NULL;
            if (!EC_GROUP_copy(dest->group, src->group))
                  return NULL;
            }
      /*  copy the public key */
      if (src->pub_key && src->group)
            {
            if (dest->pub_key)
                  EC_POINT_free(dest->pub_key);
            dest->pub_key = EC_POINT_new(src->group);
            if (dest->pub_key == NULL)
                  return NULL;
            if (!EC_POINT_copy(dest->pub_key, src->pub_key))
                  return NULL;
            }
      /* copy the private key */
      if (src->priv_key)
            {
            if (dest->priv_key == NULL)
                  {
                  dest->priv_key = BN_new();
                  if (dest->priv_key == NULL)
                        return NULL;
                  }
            if (!BN_copy(dest->priv_key, src->priv_key))
                  return NULL;
            }
      /* copy method/extra data */
      EC_EX_DATA_free_all_data(&dest->method_data);

      for (d = src->method_data; d != NULL; d = d->next)
            {
            void *t = d->dup_func(d->data);
            
            if (t == NULL)
                  return 0;
            if (!EC_EX_DATA_set_data(&dest->method_data, t, d->dup_func, d->free_func, d->clear_free_func))
                  return 0;
            }

      /* copy the rest */
      dest->enc_flag  = src->enc_flag;
      dest->conv_form = src->conv_form;
      dest->version   = src->version;

      return dest;
      }

00204 EC_KEY *EC_KEY_dup(const EC_KEY *ec_key)
      {
      EC_KEY *ret = EC_KEY_new();
      if (ret == NULL)
            return NULL;
      if (EC_KEY_copy(ret, ec_key) == NULL)
            {
            EC_KEY_free(ret);
            return NULL;
            }
      return ret;
      }

00217 int EC_KEY_up_ref(EC_KEY *r)
      {
      int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_EC);
#ifdef REF_PRINT
      REF_PRINT("EC_KEY",r);
#endif
#ifdef REF_CHECK
      if (i < 2)
            {
            fprintf(stderr, "EC_KEY_up, bad reference count\n");
            abort();
            }
#endif
      return ((i > 1) ? 1 : 0);
      }

00233 int EC_KEY_generate_key(EC_KEY *eckey)
      {     
      int   ok = 0;
      BN_CTX      *ctx = NULL;
      BIGNUM      *priv_key = NULL, *order = NULL;
      EC_POINT *pub_key = NULL;

      if (!eckey || !eckey->group)
            {
            ECerr(EC_F_EC_KEY_GENERATE_KEY, ERR_R_PASSED_NULL_PARAMETER);
            return 0;
            }

      if ((order = BN_new()) == NULL) goto err;
      if ((ctx = BN_CTX_new()) == NULL) goto err;

      if (eckey->priv_key == NULL)
            {
            priv_key = BN_new();
            if (priv_key == NULL)
                  goto err;
            }
      else
            priv_key = eckey->priv_key;

      if (!EC_GROUP_get_order(eckey->group, order, ctx))
            goto err;

      do
            if (!BN_rand_range(priv_key, order))
                  goto err;
      while (BN_is_zero(priv_key));

      if (eckey->pub_key == NULL)
            {
            pub_key = EC_POINT_new(eckey->group);
            if (pub_key == NULL)
                  goto err;
            }
      else
            pub_key = eckey->pub_key;

      if (!EC_POINT_mul(eckey->group, pub_key, priv_key, NULL, NULL, ctx))
            goto err;

      eckey->priv_key = priv_key;
      eckey->pub_key  = pub_key;

      ok=1;

err:  
      if (order)
            BN_free(order);
      if (pub_key  != NULL && eckey->pub_key  == NULL)
            EC_POINT_free(pub_key);
      if (priv_key != NULL && eckey->priv_key == NULL)
            BN_free(priv_key);
      if (ctx != NULL)
            BN_CTX_free(ctx);
      return(ok);
      }

00295 int EC_KEY_check_key(const EC_KEY *eckey)
      {
      int   ok   = 0;
      BN_CTX      *ctx = NULL;
      const BIGNUM      *order  = NULL;
      EC_POINT *point = NULL;

      if (!eckey || !eckey->group || !eckey->pub_key)
            {
            ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_PASSED_NULL_PARAMETER);
            return 0;
            }

      if (EC_POINT_is_at_infinity(eckey->group, eckey->pub_key))
            {
            ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_POINT_AT_INFINITY);
            goto err;
            }

      if ((ctx = BN_CTX_new()) == NULL)
            goto err;
      if ((point = EC_POINT_new(eckey->group)) == NULL)
            goto err;

      /* testing whether the pub_key is on the elliptic curve */
      if (!EC_POINT_is_on_curve(eckey->group, eckey->pub_key, ctx))
            {
            ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_POINT_IS_NOT_ON_CURVE);
            goto err;
            }
      /* testing whether pub_key * order is the point at infinity */
      order = &eckey->group->order;
      if (BN_is_zero(order))
            {
            ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_INVALID_GROUP_ORDER);
            goto err;
            }
      if (!EC_POINT_mul(eckey->group, point, NULL, eckey->pub_key, order, ctx))
            {
            ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_EC_LIB);
            goto err;
            }
      if (!EC_POINT_is_at_infinity(eckey->group, point))
            {
            ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_WRONG_ORDER);
            goto err;
            }
      /* in case the priv_key is present : 
       * check if generator * priv_key == pub_key 
       */
      if (eckey->priv_key)
            {
            if (BN_cmp(eckey->priv_key, order) >= 0)
                  {
                  ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_WRONG_ORDER);
                  goto err;
                  }
            if (!EC_POINT_mul(eckey->group, point, eckey->priv_key,
                  NULL, NULL, ctx))
                  {
                  ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_EC_LIB);
                  goto err;
                  }
            if (EC_POINT_cmp(eckey->group, point, eckey->pub_key, 
                  ctx) != 0)
                  {
                  ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_INVALID_PRIVATE_KEY);
                  goto err;
                  }
            }
      ok = 1;
err:
      if (ctx   != NULL)
            BN_CTX_free(ctx);
      if (point != NULL)
            EC_POINT_free(point);
      return(ok);
      }

00374 const EC_GROUP *EC_KEY_get0_group(const EC_KEY *key)
      {
      return key->group;
      }

00379 int EC_KEY_set_group(EC_KEY *key, const EC_GROUP *group)
      {
      if (key->group != NULL)
            EC_GROUP_free(key->group);
      key->group = EC_GROUP_dup(group);
      return (key->group == NULL) ? 0 : 1;
      }

00387 const BIGNUM *EC_KEY_get0_private_key(const EC_KEY *key)
      {
      return key->priv_key;
      }

00392 int EC_KEY_set_private_key(EC_KEY *key, const BIGNUM *priv_key)
      {
      if (key->priv_key)
            BN_clear_free(key->priv_key);
      key->priv_key = BN_dup(priv_key);
      return (key->priv_key == NULL) ? 0 : 1;
      }

00400 const EC_POINT *EC_KEY_get0_public_key(const EC_KEY *key)
      {
      return key->pub_key;
      }

00405 int EC_KEY_set_public_key(EC_KEY *key, const EC_POINT *pub_key)
      {
      if (key->pub_key != NULL)
            EC_POINT_free(key->pub_key);
      key->pub_key = EC_POINT_dup(pub_key, key->group);
      return (key->pub_key == NULL) ? 0 : 1;
      }

unsigned int EC_KEY_get_enc_flags(const EC_KEY *key)
      {
      return key->enc_flag;
      }

void EC_KEY_set_enc_flags(EC_KEY *key, unsigned int flags)
      {
      key->enc_flag = flags;
      }

point_conversion_form_t EC_KEY_get_conv_form(const EC_KEY *key)
      {
      return key->conv_form;
      }

void EC_KEY_set_conv_form(EC_KEY *key, point_conversion_form_t cform)
      {
      key->conv_form = cform;
      if (key->group != NULL)
            EC_GROUP_set_point_conversion_form(key->group, cform);
      }

void *EC_KEY_get_key_method_data(EC_KEY *key,
      void *(*dup_func)(void *), void (*free_func)(void *), void (*clear_free_func)(void *))
      {
      return EC_EX_DATA_get_data(key->method_data, dup_func, free_func, clear_free_func);
      }

void EC_KEY_insert_key_method_data(EC_KEY *key, void *data,
      void *(*dup_func)(void *), void (*free_func)(void *), void (*clear_free_func)(void *))
      {
      EC_EXTRA_DATA *ex_data;
      CRYPTO_w_lock(CRYPTO_LOCK_EC);
      ex_data = EC_EX_DATA_get_data(key->method_data, dup_func, free_func, clear_free_func);
      if (ex_data == NULL)
            EC_EX_DATA_set_data(&key->method_data, data, dup_func, free_func, clear_free_func);
      CRYPTO_w_unlock(CRYPTO_LOCK_EC);
      }

void EC_KEY_set_asn1_flag(EC_KEY *key, int flag)
      {
      if (key->group != NULL)
            EC_GROUP_set_asn1_flag(key->group, flag);
      }

00458 int EC_KEY_precompute_mult(EC_KEY *key, BN_CTX *ctx)
      {
      if (key->group == NULL)
            return 0;
      return EC_GROUP_precompute_mult(key->group, ctx);
      }

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