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ec_asn1.c

/* crypto/ec/ec_asn1.c */
/*
 * Written by Nils Larsch for the OpenSSL project.
 */
/* ====================================================================
 * Copyright (c) 2000-2003 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
 *    licensing@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 "ec_lcl.h"
#include <openssl/err.h>
#include <openssl/asn1t.h>
#include <openssl/objects.h>


int EC_GROUP_get_basis_type(const EC_GROUP *group)
      {
      int i=0;

      if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
            NID_X9_62_characteristic_two_field)
            /* everything else is currently not supported */
            return 0;

      while (group->poly[i] != 0)
            i++;

      if (i == 4)
            return NID_X9_62_ppBasis;
      else if (i == 2)
            return NID_X9_62_tpBasis;
      else
            /* everything else is currently not supported */
            return 0;
      }

int EC_GROUP_get_trinomial_basis(const EC_GROUP *group, unsigned int *k)
      {
      if (group == NULL)
            return 0;

      if (EC_GROUP_method_of(group)->group_set_curve != ec_GF2m_simple_group_set_curve
          || !((group->poly[0] != 0) && (group->poly[1] != 0) && (group->poly[2] == 0)))
            {
            ECerr(EC_F_EC_GROUP_GET_TRINOMIAL_BASIS, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
            return 0;
            }

      if (k)
            *k = group->poly[1];

      return 1;
      }

int EC_GROUP_get_pentanomial_basis(const EC_GROUP *group, unsigned int *k1,
      unsigned int *k2, unsigned int *k3)
      {
      if (group == NULL)
            return 0;

      if (EC_GROUP_method_of(group)->group_set_curve != ec_GF2m_simple_group_set_curve
          || !((group->poly[0] != 0) && (group->poly[1] != 0) && (group->poly[2] != 0) && (group->poly[3] != 0) && (group->poly[4] == 0)))
            {
            ECerr(EC_F_EC_GROUP_GET_PENTANOMIAL_BASIS, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
            return 0;
            }

      if (k1)
            *k1 = group->poly[3];
      if (k2)
            *k2 = group->poly[2];
      if (k3)
            *k3 = group->poly[1];

      return 1;
      }



/* some structures needed for the asn1 encoding */
typedef struct x9_62_pentanomial_st {
      long k1;
      long k2;
      long k3;
      } X9_62_PENTANOMIAL;

typedef struct x9_62_characteristic_two_st {
      long m;
      ASN1_OBJECT  *type;
      union {
            char *ptr;
            /* NID_X9_62_onBasis */
            ASN1_NULL    *onBasis;
            /* NID_X9_62_tpBasis */
            ASN1_INTEGER *tpBasis;
            /* NID_X9_62_ppBasis */
            X9_62_PENTANOMIAL *ppBasis;
            /* anything else */
            ASN1_TYPE *other;
            } p;
      } X9_62_CHARACTERISTIC_TWO;

typedef struct x9_62_fieldid_st {
        ASN1_OBJECT *fieldType;
      union {
            char *ptr;
            /* NID_X9_62_prime_field */
            ASN1_INTEGER *prime;
            /* NID_X9_62_characteristic_two_field */
            X9_62_CHARACTERISTIC_TWO *char_two;
            /* anything else */
            ASN1_TYPE *other;
            } p;
      } X9_62_FIELDID;

typedef struct x9_62_curve_st {
        ASN1_OCTET_STRING *a;
        ASN1_OCTET_STRING *b;
        ASN1_BIT_STRING   *seed;
        } X9_62_CURVE;

typedef struct ec_parameters_st {
        long              version;
        X9_62_FIELDID     *fieldID;
        X9_62_CURVE       *curve;
        ASN1_OCTET_STRING *base;
        ASN1_INTEGER      *order;
        ASN1_INTEGER      *cofactor;
        } ECPARAMETERS;

struct ecpk_parameters_st {
      int   type;
      union {
            ASN1_OBJECT  *named_curve;
            ECPARAMETERS *parameters;
            ASN1_NULL    *implicitlyCA;
      } value;
      }/* ECPKPARAMETERS */;

/* SEC1 ECPrivateKey */
typedef struct ec_privatekey_st {
      long              version;
      ASN1_OCTET_STRING *privateKey;
        ECPKPARAMETERS    *parameters;
      ASN1_BIT_STRING   *publicKey;
      } EC_PRIVATEKEY;

/* the OpenSSL ASN.1 definitions */
ASN1_SEQUENCE(X9_62_PENTANOMIAL) = {
      ASN1_SIMPLE(X9_62_PENTANOMIAL, k1, LONG),
      ASN1_SIMPLE(X9_62_PENTANOMIAL, k2, LONG),
      ASN1_SIMPLE(X9_62_PENTANOMIAL, k3, LONG)
} ASN1_SEQUENCE_END(X9_62_PENTANOMIAL)

DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)

ASN1_ADB_TEMPLATE(char_two_def) = ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.other, ASN1_ANY);

ASN1_ADB(X9_62_CHARACTERISTIC_TWO) = {
      ADB_ENTRY(NID_X9_62_onBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.onBasis, ASN1_NULL)),
      ADB_ENTRY(NID_X9_62_tpBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.tpBasis, ASN1_INTEGER)),
      ADB_ENTRY(NID_X9_62_ppBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.ppBasis, X9_62_PENTANOMIAL))
} ASN1_ADB_END(X9_62_CHARACTERISTIC_TWO, 0, type, 0, &char_two_def_tt, NULL);

ASN1_SEQUENCE(X9_62_CHARACTERISTIC_TWO) = {
      ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, m, LONG),
      ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, type, ASN1_OBJECT),
      ASN1_ADB_OBJECT(X9_62_CHARACTERISTIC_TWO)
} ASN1_SEQUENCE_END(X9_62_CHARACTERISTIC_TWO)

DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)

ASN1_ADB_TEMPLATE(fieldID_def) = ASN1_SIMPLE(X9_62_FIELDID, p.other, ASN1_ANY);

ASN1_ADB(X9_62_FIELDID) = {
      ADB_ENTRY(NID_X9_62_prime_field, ASN1_SIMPLE(X9_62_FIELDID, p.prime, ASN1_INTEGER)),
      ADB_ENTRY(NID_X9_62_characteristic_two_field, ASN1_SIMPLE(X9_62_FIELDID, p.char_two, X9_62_CHARACTERISTIC_TWO))
} ASN1_ADB_END(X9_62_FIELDID, 0, fieldType, 0, &fieldID_def_tt, NULL);

ASN1_SEQUENCE(X9_62_FIELDID) = {
      ASN1_SIMPLE(X9_62_FIELDID, fieldType, ASN1_OBJECT),
      ASN1_ADB_OBJECT(X9_62_FIELDID)
} ASN1_SEQUENCE_END(X9_62_FIELDID)

ASN1_SEQUENCE(X9_62_CURVE) = {
      ASN1_SIMPLE(X9_62_CURVE, a, ASN1_OCTET_STRING),
      ASN1_SIMPLE(X9_62_CURVE, b, ASN1_OCTET_STRING),
      ASN1_OPT(X9_62_CURVE, seed, ASN1_BIT_STRING)
} ASN1_SEQUENCE_END(X9_62_CURVE)

ASN1_SEQUENCE(ECPARAMETERS) = {
      ASN1_SIMPLE(ECPARAMETERS, version, LONG),
      ASN1_SIMPLE(ECPARAMETERS, fieldID, X9_62_FIELDID),
      ASN1_SIMPLE(ECPARAMETERS, curve, X9_62_CURVE),
      ASN1_SIMPLE(ECPARAMETERS, base, ASN1_OCTET_STRING),
      ASN1_SIMPLE(ECPARAMETERS, order, ASN1_INTEGER),
      ASN1_OPT(ECPARAMETERS, cofactor, ASN1_INTEGER)
} ASN1_SEQUENCE_END(ECPARAMETERS)

DECLARE_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
IMPLEMENT_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)

ASN1_CHOICE(ECPKPARAMETERS) = {
      ASN1_SIMPLE(ECPKPARAMETERS, value.named_curve, ASN1_OBJECT),
      ASN1_SIMPLE(ECPKPARAMETERS, value.parameters, ECPARAMETERS),
      ASN1_SIMPLE(ECPKPARAMETERS, value.implicitlyCA, ASN1_NULL)
} ASN1_CHOICE_END(ECPKPARAMETERS)

DECLARE_ASN1_FUNCTIONS_const(ECPKPARAMETERS)
DECLARE_ASN1_ENCODE_FUNCTIONS_const(ECPKPARAMETERS, ECPKPARAMETERS)
IMPLEMENT_ASN1_FUNCTIONS_const(ECPKPARAMETERS)

ASN1_SEQUENCE(EC_PRIVATEKEY) = {
      ASN1_SIMPLE(EC_PRIVATEKEY, version, LONG),
      ASN1_SIMPLE(EC_PRIVATEKEY, privateKey, ASN1_OCTET_STRING),
      ASN1_EXP_OPT(EC_PRIVATEKEY, parameters, ECPKPARAMETERS, 0),
      ASN1_EXP_OPT(EC_PRIVATEKEY, publicKey, ASN1_BIT_STRING, 1)
} ASN1_SEQUENCE_END(EC_PRIVATEKEY)

DECLARE_ASN1_FUNCTIONS_const(EC_PRIVATEKEY)
DECLARE_ASN1_ENCODE_FUNCTIONS_const(EC_PRIVATEKEY, EC_PRIVATEKEY)
IMPLEMENT_ASN1_FUNCTIONS_const(EC_PRIVATEKEY)

/* some declarations of internal function */

/* ec_asn1_group2field() sets the values in a X9_62_FIELDID object */ 
static int ec_asn1_group2fieldid(const EC_GROUP *, X9_62_FIELDID *);
/* ec_asn1_group2curve() sets the values in a X9_62_CURVE object */ 
static int ec_asn1_group2curve(const EC_GROUP *, X9_62_CURVE *);
/* ec_asn1_parameters2group() creates a EC_GROUP object from a
 * ECPARAMETERS object */
static EC_GROUP *ec_asn1_parameters2group(const ECPARAMETERS *); 
/* ec_asn1_group2parameters() creates a ECPARAMETERS object from a 
 * EC_GROUP object */
static ECPARAMETERS *ec_asn1_group2parameters(const EC_GROUP *,ECPARAMETERS *);
/* ec_asn1_pkparameters2group() creates a EC_GROUP object from a
 * ECPKPARAMETERS object */
static EC_GROUP *ec_asn1_pkparameters2group(const ECPKPARAMETERS *); 
/* ec_asn1_group2pkparameters() creates a ECPKPARAMETERS object from a 
 * EC_GROUP object */
static ECPKPARAMETERS *ec_asn1_group2pkparameters(const EC_GROUP *, 
      ECPKPARAMETERS *);


/* the function definitions */

static int ec_asn1_group2fieldid(const EC_GROUP *group, X9_62_FIELDID *field)
      {
      int               ok=0, nid;
      BIGNUM                  *tmp = NULL;
      
      if (group == NULL || field == NULL)
            return 0;

      /* clear the old values (if necessary) */
      if (field->fieldType != NULL)
            ASN1_OBJECT_free(field->fieldType);
      if (field->p.other != NULL)
            ASN1_TYPE_free(field->p.other);

      nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));
      /* set OID for the field */
      if ((field->fieldType = OBJ_nid2obj(nid)) == NULL)
            {
            ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
            goto err;
            }

      if (nid == NID_X9_62_prime_field)
            {
            if ((tmp = BN_new()) == NULL) 
                  {
                  ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
                  goto err;
                  }
            /* the parameters are specified by the prime number p */
            if (!EC_GROUP_get_curve_GFp(group, tmp, NULL, NULL, NULL))
                  {
                  ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
                  goto err;
                  }
            /* set the prime number */
            field->p.prime = BN_to_ASN1_INTEGER(tmp,NULL);
            if (field->p.prime == NULL)
                  {
                  ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
                  goto err;
                  }
            }
      else  /* nid == NID_X9_62_characteristic_two_field */
            {
            int         field_type;
            X9_62_CHARACTERISTIC_TWO *char_two;

            field->p.char_two = X9_62_CHARACTERISTIC_TWO_new();
            char_two = field->p.char_two;

            if (char_two == NULL)
                  {
                  ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
                  goto err;
                  }
      
            char_two->m = (long)EC_GROUP_get_degree(group);

            field_type = EC_GROUP_get_basis_type(group);

            if (field_type == 0)
                  {
                  ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
                  goto err;
                  }
            /* set base type OID */
            if ((char_two->type = OBJ_nid2obj(field_type)) == NULL)
                  {
                  ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
                  goto err;
                  }

            if (field_type == NID_X9_62_tpBasis)
                  {
                  unsigned int k;

                  if (!EC_GROUP_get_trinomial_basis(group, &k))
                        goto err;

                  char_two->p.tpBasis = ASN1_INTEGER_new();
                  if (!char_two->p.tpBasis)
                        {
                        ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
                        goto err;
                        }
                  if (!ASN1_INTEGER_set(char_two->p.tpBasis, (long)k))
                        {
                        ECerr(EC_F_EC_ASN1_GROUP2FIELDID,
                              ERR_R_ASN1_LIB);
                        goto err;
                        }
                  }
            else if (field_type == NID_X9_62_ppBasis)
                  {
                  unsigned int k1, k2, k3;

                  if (!EC_GROUP_get_pentanomial_basis(group, &k1, &k2, &k3))
                        goto err;

                  char_two->p.ppBasis = X9_62_PENTANOMIAL_new();
                  if (!char_two->p.ppBasis)
                        {
                        ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
                        goto err;
                        }

                  /* set k? values */
                  char_two->p.ppBasis->k1 = (long)k1;
                  char_two->p.ppBasis->k2 = (long)k2;
                  char_two->p.ppBasis->k3 = (long)k3;
                  }
            else /* field_type == NID_X9_62_onBasis */
                  {
                  /* for ONB the parameters are (asn1) NULL */
                  char_two->p.onBasis = ASN1_NULL_new();
                  if (!char_two->p.onBasis)
                        {
                        ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
                        goto err;
                        }
                  }
            }

      ok = 1;

err : if (tmp)
            BN_free(tmp);
      return(ok);
}

static int ec_asn1_group2curve(const EC_GROUP *group, X9_62_CURVE *curve)
      {
      int           ok=0, nid;
      BIGNUM        *tmp_1=NULL, *tmp_2=NULL;
      unsigned char *buffer_1=NULL, *buffer_2=NULL,
                    *a_buf=NULL, *b_buf=NULL;
      size_t        len_1, len_2;
      unsigned char char_zero = 0;

      if (!group || !curve || !curve->a || !curve->b)
            return 0;

      if ((tmp_1 = BN_new()) == NULL || (tmp_2 = BN_new()) == NULL)
            {
            ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
            goto err;
            }

      nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));

      /* get a and b */
      if (nid == NID_X9_62_prime_field)
            {
            if (!EC_GROUP_get_curve_GFp(group, NULL, tmp_1, tmp_2, NULL))
                  {
                  ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
                  goto err;
                  }
            }
      else  /* nid == NID_X9_62_characteristic_two_field */
            {
            if (!EC_GROUP_get_curve_GF2m(group, NULL, tmp_1, tmp_2, NULL))
                  {
                  ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
                  goto err;
                  }
            }

      len_1 = (size_t)BN_num_bytes(tmp_1);
      len_2 = (size_t)BN_num_bytes(tmp_2);

      if (len_1 == 0)
            {
            /* len_1 == 0 => a == 0 */
            a_buf = &char_zero;
            len_1 = 1;
            }
      else
            {
            if ((buffer_1 = OPENSSL_malloc(len_1)) == NULL)
                  {
                  ECerr(EC_F_EC_ASN1_GROUP2CURVE,
                        ERR_R_MALLOC_FAILURE);
                  goto err;
                  }
            if ( (len_1 = BN_bn2bin(tmp_1, buffer_1)) == 0)
                  {
                  ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
                  goto err;
                  }
            a_buf = buffer_1;
            }

      if (len_2 == 0)
            {
            /* len_2 == 0 => b == 0 */
            b_buf = &char_zero;
            len_2 = 1;
            }
      else
            {
            if ((buffer_2 = OPENSSL_malloc(len_2)) == NULL)
                  {
                  ECerr(EC_F_EC_ASN1_GROUP2CURVE,
                        ERR_R_MALLOC_FAILURE);
                  goto err;
                  }
            if ( (len_2 = BN_bn2bin(tmp_2, buffer_2)) == 0)
                  {
                  ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
                  goto err;
                  }
            b_buf = buffer_2;
            }
      
      /* set a and b */
      if (!M_ASN1_OCTET_STRING_set(curve->a, a_buf, len_1) ||
          !M_ASN1_OCTET_STRING_set(curve->b, b_buf, len_2))
            {
            ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
            goto err;
            }
      
      /* set the seed (optional) */
      if (group->seed)
            {     
            if (!curve->seed)
                  if ((curve->seed = ASN1_BIT_STRING_new()) == NULL)
                        {
                        ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
                        goto err;
                        }
            if (!ASN1_BIT_STRING_set(curve->seed, group->seed, 
                                     (int)group->seed_len))
                  {
                  ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
                  goto err;
                  }
            }
      else
            {
            if (curve->seed)
                  {
                  ASN1_BIT_STRING_free(curve->seed);
                  curve->seed = NULL;
                  }
            }

      ok = 1;

err:  if (buffer_1)
            OPENSSL_free(buffer_1);
      if (buffer_2)
            OPENSSL_free(buffer_2);
      if (tmp_1)
            BN_free(tmp_1);
      if (tmp_2)
            BN_free(tmp_2);
      return(ok);
      }

static ECPARAMETERS *ec_asn1_group2parameters(const EC_GROUP *group,
                                              ECPARAMETERS *param)
      {
      int   ok=0;
      size_t  len=0;
      ECPARAMETERS   *ret=NULL;
      BIGNUM             *tmp=NULL;
      unsigned char  *buffer=NULL;
      const EC_POINT *point=NULL;
      point_conversion_form_t form;

      if ((tmp = BN_new()) == NULL)
            {
            ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
            goto err;
            }

      if (param == NULL)
      {
            if ((ret = ECPARAMETERS_new()) == NULL)
                  {
                  ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, 
                        ERR_R_MALLOC_FAILURE);
                  goto err;
                  }
      }
      else
            ret = param;

      /* set the version (always one) */
      ret->version = (long)0x1;

      /* set the fieldID */
      if (!ec_asn1_group2fieldid(group, ret->fieldID))
            {
            ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
            goto err;
            }

      /* set the curve */
      if (!ec_asn1_group2curve(group, ret->curve))
            {
            ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
            goto err;
            }

      /* set the base point */
      if ((point = EC_GROUP_get0_generator(group)) == NULL)
            {
            ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, EC_R_UNDEFINED_GENERATOR);
            goto err;
            }

      form = EC_GROUP_get_point_conversion_form(group);

      len = EC_POINT_point2oct(group, point, form, NULL, len, NULL);
      if (len == 0)
            {
            ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
            goto err;
            }
      if ((buffer = OPENSSL_malloc(len)) == NULL)
            {
            ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
            goto err;
            }
      if (!EC_POINT_point2oct(group, point, form, buffer, len, NULL))
            {
            ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
            goto err;
            }
      if (ret->base == NULL && (ret->base = ASN1_OCTET_STRING_new()) == NULL)
            {
            ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
            goto err;
            }
      if (!ASN1_OCTET_STRING_set(ret->base, buffer, len))
            {
            ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
            goto err;
            }

      /* set the order */
      if (!EC_GROUP_get_order(group, tmp, NULL))
            {
            ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
            goto err;
            }
      ret->order = BN_to_ASN1_INTEGER(tmp, ret->order);
      if (ret->order == NULL)
            {
            ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
            goto err;
            }

      /* set the cofactor (optional) */
      if (EC_GROUP_get_cofactor(group, tmp, NULL))
            {
            ret->cofactor = BN_to_ASN1_INTEGER(tmp, ret->cofactor);
            if (ret->cofactor == NULL)
                  {
                  ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
                  goto err;
                  }
            }

      ok = 1;

err : if(!ok)
            {
            if (ret && !param)
                  ECPARAMETERS_free(ret);
            ret = NULL;
            }
      if (tmp)
            BN_free(tmp);
      if (buffer)
            OPENSSL_free(buffer);
      return(ret);
      }

ECPKPARAMETERS *ec_asn1_group2pkparameters(const EC_GROUP *group, 
                                           ECPKPARAMETERS *params)
      {
      int            ok = 1, tmp;
      ECPKPARAMETERS *ret = params;

      if (ret == NULL)
            {
            if ((ret = ECPKPARAMETERS_new()) == NULL)
                  {
                  ECerr(EC_F_EC_ASN1_GROUP2PKPARAMETERS, 
                        ERR_R_MALLOC_FAILURE);
                  return NULL;
                  }
            }
      else
            {
            if (ret->type == 0 && ret->value.named_curve)
                  ASN1_OBJECT_free(ret->value.named_curve);
            else if (ret->type == 1 && ret->value.parameters)
                  ECPARAMETERS_free(ret->value.parameters);
            }

      if (EC_GROUP_get_asn1_flag(group))
            {
            /* use the asn1 OID to describe the
             * the elliptic curve parameters
             */
            tmp = EC_GROUP_get_curve_name(group);
            if (tmp)
                  {
                  ret->type = 0;
                  if ((ret->value.named_curve = OBJ_nid2obj(tmp)) == NULL)
                        ok = 0;
                  }
            else
                  /* we don't kmow the nid => ERROR */
                  ok = 0;
            }
      else
            {     
            /* use the ECPARAMETERS structure */
            ret->type = 1;
            if ((ret->value.parameters = ec_asn1_group2parameters(
                 group, NULL)) == NULL)
                  ok = 0;
            }

      if (!ok)
            {
            ECPKPARAMETERS_free(ret);
            return NULL;
            }
      return ret;
      }

static EC_GROUP *ec_asn1_parameters2group(const ECPARAMETERS *params)
      {
      int               ok = 0, tmp;
      EC_GROUP          *ret = NULL;
      BIGNUM                  *p = NULL, *a = NULL, *b = NULL;
      EC_POINT          *point=NULL;

      if (!params->fieldID || !params->fieldID->fieldType || 
          !params->fieldID->p.ptr)
            {
            ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
            goto err;
            }

      /* now extract the curve parameters a and b */
      if (!params->curve || !params->curve->a || 
          !params->curve->a->data || !params->curve->b ||
          !params->curve->b->data)
            {
            ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
            goto err;
            }
      a = BN_bin2bn(params->curve->a->data, params->curve->a->length, NULL);
      if (a == NULL)
            {
            ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_BN_LIB);
            goto err;
            }
      b = BN_bin2bn(params->curve->b->data, params->curve->b->length, NULL);
      if (b == NULL)
            {
            ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_BN_LIB);
            goto err;
            }

      /* get the field parameters */
      tmp = OBJ_obj2nid(params->fieldID->fieldType);

      if (tmp == NID_X9_62_characteristic_two_field)
            {
            X9_62_CHARACTERISTIC_TWO *char_two;

            char_two = params->fieldID->p.char_two;

            if ((p = BN_new()) == NULL)
                  {
                  ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_MALLOC_FAILURE);
                  goto err;
                  }

            /* get the base type */
            tmp = OBJ_obj2nid(char_two->type);

            if (tmp ==  NID_X9_62_tpBasis)
                  {
                  long tmp_long;

                  if (!char_two->p.tpBasis)
                        {
                        ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
                        goto err;
                        }

                  tmp_long = ASN1_INTEGER_get(char_two->p.tpBasis);
                  /* create the polynomial */
                  if (!BN_set_bit(p, (int)char_two->m))
                        goto err;
                  if (!BN_set_bit(p, (int)tmp_long))
                        goto err;
                  if (!BN_set_bit(p, 0))
                        goto err;
                  }
            else if (tmp == NID_X9_62_ppBasis)
                  {
                  X9_62_PENTANOMIAL *penta;

                  penta = char_two->p.ppBasis;
                  if (!penta)
                        {
                        ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
                        goto err;
                        }
                  /* create the polynomial */
                  if (!BN_set_bit(p, (int)char_two->m)) goto err;
                  if (!BN_set_bit(p, (int)penta->k1)) goto err;
                  if (!BN_set_bit(p, (int)penta->k2)) goto err;
                  if (!BN_set_bit(p, (int)penta->k3)) goto err;
                  if (!BN_set_bit(p, 0)) goto err;
                  }
            else if (tmp == NID_X9_62_onBasis)
                  {
                  ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_NOT_IMPLEMENTED);
                  goto err;
                  }
            else /* error */
                  {
                  ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
                  goto err;
                  }

            /* create the EC_GROUP structure */
            ret = EC_GROUP_new_curve_GF2m(p, a, b, NULL);
            }
      else if (tmp == NID_X9_62_prime_field)
            {
            /* we have a curve over a prime field */
            /* extract the prime number */
            if (!params->fieldID->p.prime)
                  {
                  ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
                  goto err;
                  }
            p = ASN1_INTEGER_to_BN(params->fieldID->p.prime, NULL);
            if (p == NULL)
                  {
                  ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
                  goto err;
                  }
            /* create the EC_GROUP structure */
            ret = EC_GROUP_new_curve_GFp(p, a, b, NULL);
            }
      else
            {
            ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_FIELD);
            goto err;
            }

      if (ret == NULL)
            {
            ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
            goto err;
            }

      /* extract seed (optional) */
      if (params->curve->seed != NULL)
            {
            if (ret->seed != NULL)
                  OPENSSL_free(ret->seed);
            if (!(ret->seed = OPENSSL_malloc(params->curve->seed->length)))
                  {
                  ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, 
                        ERR_R_MALLOC_FAILURE);
                  goto err;
                  }
            memcpy(ret->seed, params->curve->seed->data, 
                   params->curve->seed->length);
            ret->seed_len = params->curve->seed->length;
            }

      if (!params->order || !params->base || !params->base->data)
            {
            ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
            goto err;
            }

      if ((point = EC_POINT_new(ret)) == NULL) goto err;

      /* set the point conversion form */
      EC_GROUP_set_point_conversion_form(ret, (point_conversion_form_t)
                        (params->base->data[0] & ~0x01));

      /* extract the ec point */
      if (!EC_POINT_oct2point(ret, point, params->base->data, 
                            params->base->length, NULL))
            {
            ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
            goto err;
            }

      /* extract the order */
      if ((a = ASN1_INTEGER_to_BN(params->order, a)) == NULL)
            {
            ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
            goto err;
            }
      
      /* extract the cofactor (optional) */
      if (params->cofactor == NULL)
            {
            if (b)
                  {
                  BN_free(b);
                  b = NULL;
                  }
            }
      else
            if ((b = ASN1_INTEGER_to_BN(params->cofactor, b)) == NULL)
                  {
                  ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
                  goto err;
                  }
      /* set the generator, order and cofactor (if present) */
      if (!EC_GROUP_set_generator(ret, point, a, b))
            {
            ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
            goto err;
            }

      ok = 1;

err:  if (!ok)
            {
            if (ret) 
                  EC_GROUP_clear_free(ret);
            ret = NULL;
            }

      if (p)      
            BN_free(p);
      if (a)      
            BN_free(a);
      if (b)      
            BN_free(b);
      if (point)  
            EC_POINT_free(point);
      return(ret);
}

EC_GROUP *ec_asn1_pkparameters2group(const ECPKPARAMETERS *params)
      {
      EC_GROUP *ret=NULL;
      int      tmp=0;

      if (params == NULL)
            {
            ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, 
                  EC_R_MISSING_PARAMETERS);
            return NULL;
            }

      if (params->type == 0)
            { /* the curve is given by an OID */
            tmp = OBJ_obj2nid(params->value.named_curve);
            if ((ret = EC_GROUP_new_by_curve_name(tmp)) == NULL)
                  {
                  ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, 
                        EC_R_EC_GROUP_NEW_BY_NAME_FAILURE);
                  return NULL;
                  }
            EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_NAMED_CURVE);
            }
      else if (params->type == 1)
            { /* the parameters are given by a ECPARAMETERS
               * structure */
            ret = ec_asn1_parameters2group(params->value.parameters);
            if (!ret)
                  {
                  ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, ERR_R_EC_LIB);
                  return NULL;
                  }
            EC_GROUP_set_asn1_flag(ret, 0x0);
            }
      else if (params->type == 2)
            { /* implicitlyCA */
            return NULL;
            }
      else
            {
            ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, EC_R_ASN1_ERROR);
            return NULL;
            }

      return ret;
      }

/* EC_GROUP <-> DER encoding of ECPKPARAMETERS */

EC_GROUP *d2i_ECPKParameters(EC_GROUP **a, const unsigned char **in, long len)
      {
      EC_GROUP    *group  = NULL;
      ECPKPARAMETERS    *params = NULL;

      if ((params = d2i_ECPKPARAMETERS(NULL, in, len)) == NULL)
            {
            ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_D2I_ECPKPARAMETERS_FAILURE);
            ECPKPARAMETERS_free(params);
            return NULL;
            }
      
      if ((group = ec_asn1_pkparameters2group(params)) == NULL)
            {
            ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_PKPARAMETERS2GROUP_FAILURE);
            return NULL; 
            }

      
      if (a && *a)
            EC_GROUP_clear_free(*a);
      if (a)
            *a = group;

      ECPKPARAMETERS_free(params);
      return(group);
      }

int i2d_ECPKParameters(const EC_GROUP *a, unsigned char **out)
      {
      int         ret=0;
      ECPKPARAMETERS    *tmp = ec_asn1_group2pkparameters(a, NULL);
      if (tmp == NULL)
            {
            ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_GROUP2PKPARAMETERS_FAILURE);
            return 0;
            }
      if ((ret = i2d_ECPKPARAMETERS(tmp, out)) == 0)
            {
            ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_I2D_ECPKPARAMETERS_FAILURE);
            ECPKPARAMETERS_free(tmp);
            return 0;
            }     
      ECPKPARAMETERS_free(tmp);
      return(ret);
      }

/* some EC_KEY functions */

EC_KEY *d2i_ECPrivateKey(EC_KEY **a, const unsigned char **in, long len)
      {
      int             ok=0;
      EC_KEY          *ret=NULL;
      EC_PRIVATEKEY   *priv_key=NULL;

      if ((priv_key = EC_PRIVATEKEY_new()) == NULL)
            {
            ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
            return NULL;
            }

      if ((priv_key = d2i_EC_PRIVATEKEY(&priv_key, in, len)) == NULL)
            {
            ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
            EC_PRIVATEKEY_free(priv_key);
            return NULL;
            }

      if (a == NULL || *a == NULL)
            {
            if ((ret = EC_KEY_new()) == NULL)   
                  {
                  ECerr(EC_F_D2I_ECPRIVATEKEY,
                                 ERR_R_MALLOC_FAILURE);
                  goto err;
                  }
            if (a)
                  *a = ret;
            }
      else
            ret = *a;

      if (priv_key->parameters)
            {
            if (ret->group)
                  EC_GROUP_clear_free(ret->group);
            ret->group = ec_asn1_pkparameters2group(priv_key->parameters);
            }

      if (ret->group == NULL)
            {
            ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
            goto err;
            }

      ret->version = priv_key->version;

      if (priv_key->privateKey)
            {
            ret->priv_key = BN_bin2bn(
                  M_ASN1_STRING_data(priv_key->privateKey),
                  M_ASN1_STRING_length(priv_key->privateKey),
                  ret->priv_key);
            if (ret->priv_key == NULL)
                  {
                  ECerr(EC_F_D2I_ECPRIVATEKEY,
                              ERR_R_BN_LIB);
                  goto err;
                  }
            }
      else
            {
            ECerr(EC_F_D2I_ECPRIVATEKEY, 
                      EC_R_MISSING_PRIVATE_KEY);
            goto err;
            }

      if (priv_key->publicKey)
            {
            const unsigned char *pub_oct;
            size_t pub_oct_len;

            if (ret->pub_key)
                  EC_POINT_clear_free(ret->pub_key);
            ret->pub_key = EC_POINT_new(ret->group);
            if (ret->pub_key == NULL)
                  {
                  ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
                  goto err;
                  }
            pub_oct     = M_ASN1_STRING_data(priv_key->publicKey);
            pub_oct_len = M_ASN1_STRING_length(priv_key->publicKey);
            /* save the point conversion form */
            ret->conv_form = (point_conversion_form_t)(pub_oct[0] & ~0x01);
            if (!EC_POINT_oct2point(ret->group, ret->pub_key,
                  pub_oct, pub_oct_len, NULL))
                  {
                  ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
                  goto err;
                  }
            }

      ok = 1;
err:
      if (!ok)
            {
            if (ret)
                  EC_KEY_free(ret);
            ret = NULL;
            }

      if (priv_key)
            EC_PRIVATEKEY_free(priv_key);

      return(ret);
      }

int   i2d_ECPrivateKey(EC_KEY *a, unsigned char **out)
      {
      int             ret=0, ok=0;
      unsigned char   *buffer=NULL;
      size_t          buf_len=0, tmp_len;
      EC_PRIVATEKEY   *priv_key=NULL;

      if (a == NULL || a->group == NULL || a->priv_key == NULL)
            {
            ECerr(EC_F_I2D_ECPRIVATEKEY,
                      ERR_R_PASSED_NULL_PARAMETER);
            goto err;
            }

      if ((priv_key = EC_PRIVATEKEY_new()) == NULL)
            {
            ECerr(EC_F_I2D_ECPRIVATEKEY,
                      ERR_R_MALLOC_FAILURE);
            goto err;
            }

      priv_key->version = a->version;

      buf_len = (size_t)BN_num_bytes(a->priv_key);
      buffer = OPENSSL_malloc(buf_len);
      if (buffer == NULL)
            {
            ECerr(EC_F_I2D_ECPRIVATEKEY,
                      ERR_R_MALLOC_FAILURE);
            goto err;
            }
      
      if (!BN_bn2bin(a->priv_key, buffer))
            {
            ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_BN_LIB);
            goto err;
            }

      if (!M_ASN1_OCTET_STRING_set(priv_key->privateKey, buffer, buf_len))
            {
            ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_ASN1_LIB);
            goto err;
            }     

      if (!(a->enc_flag & EC_PKEY_NO_PARAMETERS))
            {
            if ((priv_key->parameters = ec_asn1_group2pkparameters(
                  a->group, priv_key->parameters)) == NULL)
                  {
                  ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
                  goto err;
                  }
            }

      if (!(a->enc_flag & EC_PKEY_NO_PUBKEY))
            {
            priv_key->publicKey = M_ASN1_BIT_STRING_new();
            if (priv_key->publicKey == NULL)
                  {
                  ECerr(EC_F_I2D_ECPRIVATEKEY,
                        ERR_R_MALLOC_FAILURE);
                  goto err;
                  }

            tmp_len = EC_POINT_point2oct(a->group, a->pub_key, 
                        a->conv_form, NULL, 0, NULL);

            if (tmp_len > buf_len)
                  {
                  unsigned char *tmp_buffer = OPENSSL_realloc(buffer, tmp_len);
                  if (!tmp_buffer)
                        {
                        ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
                        goto err;
                        }
                  buffer = tmp_buffer;
                  buf_len = tmp_len;
                  }

            if (!EC_POINT_point2oct(a->group, a->pub_key, 
                  a->conv_form, buffer, buf_len, NULL))
                  {
                  ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
                  goto err;
                  }

            if (!M_ASN1_BIT_STRING_set(priv_key->publicKey, buffer, 
                        buf_len))
                  {
                  ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_ASN1_LIB);
                  goto err;
                  }
            }

      if ((ret = i2d_EC_PRIVATEKEY(priv_key, out)) == 0)
            {
            ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
            goto err;
            }
      ok=1;
err:
      if (buffer)
            OPENSSL_free(buffer);
      if (priv_key)
            EC_PRIVATEKEY_free(priv_key);
      return(ok?ret:0);
      }

int i2d_ECParameters(EC_KEY *a, unsigned char **out)
      {
      if (a == NULL)
            {
            ECerr(EC_F_I2D_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
            return 0;
            }
      return i2d_ECPKParameters(a->group, out);
      }

EC_KEY *d2i_ECParameters(EC_KEY **a, const unsigned char **in, long len)
      {
      EC_KEY   *ret;

      if (in == NULL || *in == NULL)
            {
            ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
            return NULL;
            }

      if (a == NULL || *a == NULL)
            {
            if ((ret = EC_KEY_new()) == NULL)
                  {
                  ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
                  return NULL;
                  }
            if (a)
                  *a = ret;
            }
      else
            ret = *a;

      if (!d2i_ECPKParameters(&ret->group, in, len))
            {
            ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_EC_LIB);
            return NULL;
            }

      return ret;
      }

EC_KEY *o2i_ECPublicKey(EC_KEY **a, const unsigned char **in, long len)
      {
      EC_KEY *ret=NULL;

      if (a == NULL || (*a) == NULL || (*a)->group == NULL)
            {
            /* sorry, but a EC_GROUP-structur is necessary
                 * to set the public key */
            ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
            return 0;
            }
      ret = *a;
      if (ret->pub_key == NULL && 
            (ret->pub_key = EC_POINT_new(ret->group)) == NULL)
            {
            ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_MALLOC_FAILURE);
            return 0;
            }
      if (!EC_POINT_oct2point(ret->group, ret->pub_key, *in, len, NULL))
            {
            ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_EC_LIB);
            return 0;
            }
      /* save the point conversion form */
      ret->conv_form = (point_conversion_form_t)(*in[0] & ~0x01);
      *in += len;
      return ret;
      }

int i2o_ECPublicKey(EC_KEY *a, unsigned char **out)
      {
        size_t buf_len=0;
      int new_buffer = 0;

        if (a == NULL) 
            {
            ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
            return 0;
            }

        buf_len = EC_POINT_point2oct(a->group, a->pub_key, 
                              a->conv_form, NULL, 0, NULL);

      if (out == NULL || buf_len == 0)
      /* out == NULL => just return the length of the octet string */
            return buf_len;

      if (*out == NULL)
            {
            if ((*out = OPENSSL_malloc(buf_len)) == NULL)
                  {
                  ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_MALLOC_FAILURE);
                  return 0;
                  }
            new_buffer = 1;
            }
        if (!EC_POINT_point2oct(a->group, a->pub_key, a->conv_form,
                        *out, buf_len, NULL))
            {
            ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_EC_LIB);
            OPENSSL_free(*out);
            *out = NULL;
            return 0;
            }
      if (!new_buffer)
            *out += buf_len;
      return buf_len;
      }

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