/src/libressl/crypto/ec/ec_asn1.c

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/* $OpenBSD: ec_asn1.c,v 1.37 2022/05/24 20:06:32 tb Exp $ */
/*
 * 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 <openssl/opensslconf.h>

#include <openssl/err.h>
#include <openssl/asn1t.h>
#include <openssl/objects.h>

#include "asn1_locl.h"
#include "ec_lcl.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;
}

#ifndef OPENSSL_NO_EC2M
int 
EC_GROUP_get_trinomial_basis(const EC_GROUP * group, unsigned int *k)
{
  if (group == NULL)
    return 0;

  if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
      NID_X9_62_characteristic_two_field
      || !((group->poly[0] != 0) && (group->poly[1] != 0) && (group->poly[2] == 0))) {
    ECerror(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_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
      NID_X9_62_characteristic_two_field
      || !((group->poly[0] != 0) && (group->poly[1] != 0) && (group->poly[2] != 0) && (group->poly[3] != 0) && (group->poly[4] == 0))) {
    ECerror(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;
}
#endif

/* 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 */
static const ASN1_TEMPLATE X9_62_PENTANOMIAL_seq_tt[] = {
  {
    .flags = 0,
    .tag = 0,
    .offset = offsetof(X9_62_PENTANOMIAL, k1),
    .field_name = "k1",
    .item = &LONG_it,
  },
  {
    .flags = 0,
    .tag = 0,
    .offset = offsetof(X9_62_PENTANOMIAL, k2),
    .field_name = "k2",
    .item = &LONG_it,
  },
  {
    .flags = 0,
    .tag = 0,
    .offset = offsetof(X9_62_PENTANOMIAL, k3),
    .field_name = "k3",
    .item = &LONG_it,
  },
};

const ASN1_ITEM X9_62_PENTANOMIAL_it = {
  .itype = ASN1_ITYPE_SEQUENCE,
  .utype = V_ASN1_SEQUENCE,
  .templates = X9_62_PENTANOMIAL_seq_tt,
  .tcount = sizeof(X9_62_PENTANOMIAL_seq_tt) / sizeof(ASN1_TEMPLATE),
  .funcs = NULL,
  .size = sizeof(X9_62_PENTANOMIAL),
  .sname = "X9_62_PENTANOMIAL",
};

X9_62_PENTANOMIAL *X9_62_PENTANOMIAL_new(void);
void X9_62_PENTANOMIAL_free(X9_62_PENTANOMIAL *a);

X9_62_PENTANOMIAL *
X9_62_PENTANOMIAL_new(void)
{
  return (X9_62_PENTANOMIAL*)ASN1_item_new(&X9_62_PENTANOMIAL_it);
}

void
X9_62_PENTANOMIAL_free(X9_62_PENTANOMIAL *a)
{
  ASN1_item_free((ASN1_VALUE *)a, &X9_62_PENTANOMIAL_it);
}

static const ASN1_TEMPLATE char_two_def_tt = {
  .flags = 0,
  .tag = 0,
  .offset = offsetof(X9_62_CHARACTERISTIC_TWO, p.other),
  .field_name = "p.other",
  .item = &ASN1_ANY_it,
};

static const ASN1_ADB_TABLE X9_62_CHARACTERISTIC_TWO_adbtbl[] = {
  {
    .value = NID_X9_62_onBasis,
    .tt = {
      .flags = 0,
      .tag = 0,
      .offset = offsetof(X9_62_CHARACTERISTIC_TWO, p.onBasis),
      .field_name = "p.onBasis",
      .item = &ASN1_NULL_it,
    },
  
  },
  {
    .value = NID_X9_62_tpBasis,
    .tt = {
      .flags = 0,
      .tag = 0,
      .offset = offsetof(X9_62_CHARACTERISTIC_TWO, p.tpBasis),
      .field_name = "p.tpBasis",
      .item = &ASN1_INTEGER_it,
    },
  
  },
  {
    .value = NID_X9_62_ppBasis,
    .tt = {
      .flags = 0,
      .tag = 0,
      .offset = offsetof(X9_62_CHARACTERISTIC_TWO, p.ppBasis),
      .field_name = "p.ppBasis",
      .item = &X9_62_PENTANOMIAL_it,
    },
  
  },
};

static const ASN1_ADB X9_62_CHARACTERISTIC_TWO_adb = {
  .flags = 0,
  .offset = offsetof(X9_62_CHARACTERISTIC_TWO, type),
  .tbl = X9_62_CHARACTERISTIC_TWO_adbtbl,
  .tblcount = sizeof(X9_62_CHARACTERISTIC_TWO_adbtbl) / sizeof(ASN1_ADB_TABLE),
  .default_tt = &char_two_def_tt,
  .null_tt = NULL,
};

static const ASN1_TEMPLATE X9_62_CHARACTERISTIC_TWO_seq_tt[] = {
  {
    .flags = 0,
    .tag = 0,
    .offset = offsetof(X9_62_CHARACTERISTIC_TWO, m),
    .field_name = "m",
    .item = &LONG_it,
  },
  {
    .flags = 0,
    .tag = 0,
    .offset = offsetof(X9_62_CHARACTERISTIC_TWO, type),
    .field_name = "type",
    .item = &ASN1_OBJECT_it,
  },
  {
    .flags = ASN1_TFLG_ADB_OID,
    .tag = -1,
    .offset = 0,
    .field_name = "X9_62_CHARACTERISTIC_TWO",
    .item = (const ASN1_ITEM *)&X9_62_CHARACTERISTIC_TWO_adb,
  },
};

const ASN1_ITEM X9_62_CHARACTERISTIC_TWO_it = {
  .itype = ASN1_ITYPE_SEQUENCE,
  .utype = V_ASN1_SEQUENCE,
  .templates = X9_62_CHARACTERISTIC_TWO_seq_tt,
  .tcount = sizeof(X9_62_CHARACTERISTIC_TWO_seq_tt) / sizeof(ASN1_TEMPLATE),
  .funcs = NULL,
  .size = sizeof(X9_62_CHARACTERISTIC_TWO),
  .sname = "X9_62_CHARACTERISTIC_TWO",
};

X9_62_CHARACTERISTIC_TWO *X9_62_CHARACTERISTIC_TWO_new(void);
void X9_62_CHARACTERISTIC_TWO_free(X9_62_CHARACTERISTIC_TWO *a);

X9_62_CHARACTERISTIC_TWO *
X9_62_CHARACTERISTIC_TWO_new(void)
{
  return (X9_62_CHARACTERISTIC_TWO*)ASN1_item_new(&X9_62_CHARACTERISTIC_TWO_it);
}

void
X9_62_CHARACTERISTIC_TWO_free(X9_62_CHARACTERISTIC_TWO *a)
{
  ASN1_item_free((ASN1_VALUE *)a, &X9_62_CHARACTERISTIC_TWO_it);
}

static const ASN1_TEMPLATE fieldID_def_tt = {
  .flags = 0,
  .tag = 0,
  .offset = offsetof(X9_62_FIELDID, p.other),
  .field_name = "p.other",
  .item = &ASN1_ANY_it,
};

static const ASN1_ADB_TABLE X9_62_FIELDID_adbtbl[] = {
  {
    .value = NID_X9_62_prime_field,
    .tt = {
      .flags = 0,
      .tag = 0,
      .offset = offsetof(X9_62_FIELDID, p.prime),
      .field_name = "p.prime",
      .item = &ASN1_INTEGER_it,
    },
  
  },
  {
    .value = NID_X9_62_characteristic_two_field,
    .tt = {
      .flags = 0,
      .tag = 0,
      .offset = offsetof(X9_62_FIELDID, p.char_two),
      .field_name = "p.char_two",
      .item = &X9_62_CHARACTERISTIC_TWO_it,
    },
  
  },
};

static const ASN1_ADB X9_62_FIELDID_adb = {
  .flags = 0,
  .offset = offsetof(X9_62_FIELDID, fieldType),
  .tbl = X9_62_FIELDID_adbtbl,
  .tblcount = sizeof(X9_62_FIELDID_adbtbl) / sizeof(ASN1_ADB_TABLE),
  .default_tt = &fieldID_def_tt,
  .null_tt = NULL,
};

static const ASN1_TEMPLATE X9_62_FIELDID_seq_tt[] = {
  {
    .flags = 0,
    .tag = 0,
    .offset = offsetof(X9_62_FIELDID, fieldType),
    .field_name = "fieldType",
    .item = &ASN1_OBJECT_it,
  },
  {
    .flags = ASN1_TFLG_ADB_OID,
    .tag = -1,
    .offset = 0,
    .field_name = "X9_62_FIELDID",
    .item = (const ASN1_ITEM *)&X9_62_FIELDID_adb,
  },
};

const ASN1_ITEM X9_62_FIELDID_it = {
  .itype = ASN1_ITYPE_SEQUENCE,
  .utype = V_ASN1_SEQUENCE,
  .templates = X9_62_FIELDID_seq_tt,
  .tcount = sizeof(X9_62_FIELDID_seq_tt) / sizeof(ASN1_TEMPLATE),
  .funcs = NULL,
  .size = sizeof(X9_62_FIELDID),
  .sname = "X9_62_FIELDID",
};

static const ASN1_TEMPLATE X9_62_CURVE_seq_tt[] = {
  {
    .flags = 0,
    .tag = 0,
    .offset = offsetof(X9_62_CURVE, a),
    .field_name = "a",
    .item = &ASN1_OCTET_STRING_it,
  },
  {
    .flags = 0,
    .tag = 0,
    .offset = offsetof(X9_62_CURVE, b),
    .field_name = "b",
    .item = &ASN1_OCTET_STRING_it,
  },
  {
    .flags = ASN1_TFLG_OPTIONAL,
    .tag = 0,
    .offset = offsetof(X9_62_CURVE, seed),
    .field_name = "seed",
    .item = &ASN1_BIT_STRING_it,
  },
};

const ASN1_ITEM X9_62_CURVE_it = {
  .itype = ASN1_ITYPE_SEQUENCE,
  .utype = V_ASN1_SEQUENCE,
  .templates = X9_62_CURVE_seq_tt,
  .tcount = sizeof(X9_62_CURVE_seq_tt) / sizeof(ASN1_TEMPLATE),
  .funcs = NULL,
  .size = sizeof(X9_62_CURVE),
  .sname = "X9_62_CURVE",
};

static const ASN1_TEMPLATE ECPARAMETERS_seq_tt[] = {
  {
    .flags = 0,
    .tag = 0,
    .offset = offsetof(ECPARAMETERS, version),
    .field_name = "version",
    .item = &LONG_it,
  },
  {
    .flags = 0,
    .tag = 0,
    .offset = offsetof(ECPARAMETERS, fieldID),
    .field_name = "fieldID",
    .item = &X9_62_FIELDID_it,
  },
  {
    .flags = 0,
    .tag = 0,
    .offset = offsetof(ECPARAMETERS, curve),
    .field_name = "curve",
    .item = &X9_62_CURVE_it,
  },
  {
    .flags = 0,
    .tag = 0,
    .offset = offsetof(ECPARAMETERS, base),
    .field_name = "base",
    .item = &ASN1_OCTET_STRING_it,
  },
  {
    .flags = 0,
    .tag = 0,
    .offset = offsetof(ECPARAMETERS, order),
    .field_name = "order",
    .item = &ASN1_INTEGER_it,
  },
  {
    .flags = ASN1_TFLG_OPTIONAL,
    .tag = 0,
    .offset = offsetof(ECPARAMETERS, cofactor),
    .field_name = "cofactor",
    .item = &ASN1_INTEGER_it,
  },
};

const ASN1_ITEM ECPARAMETERS_it = {
  .itype = ASN1_ITYPE_SEQUENCE,
  .utype = V_ASN1_SEQUENCE,
  .templates = ECPARAMETERS_seq_tt,
  .tcount = sizeof(ECPARAMETERS_seq_tt) / sizeof(ASN1_TEMPLATE),
  .funcs = NULL,
  .size = sizeof(ECPARAMETERS),
  .sname = "ECPARAMETERS",
};

ECPARAMETERS *ECPARAMETERS_new(void);
void ECPARAMETERS_free(ECPARAMETERS *a);

ECPARAMETERS *
ECPARAMETERS_new(void)
{
  return (ECPARAMETERS*)ASN1_item_new(&ECPARAMETERS_it);
}

void
ECPARAMETERS_free(ECPARAMETERS *a)
{
  ASN1_item_free((ASN1_VALUE *)a, &ECPARAMETERS_it);
}

static const ASN1_TEMPLATE ECPKPARAMETERS_ch_tt[] = {
  {
    .flags = 0,
    .tag = 0,
    .offset = offsetof(ECPKPARAMETERS, value.named_curve),
    .field_name = "value.named_curve",
    .item = &ASN1_OBJECT_it,
  },
  {
    .flags = 0,
    .tag = 0,
    .offset = offsetof(ECPKPARAMETERS, value.parameters),
    .field_name = "value.parameters",
    .item = &ECPARAMETERS_it,
  },
  {
    .flags = 0,
    .tag = 0,
    .offset = offsetof(ECPKPARAMETERS, value.implicitlyCA),
    .field_name = "value.implicitlyCA",
    .item = &ASN1_NULL_it,
  },
};

const ASN1_ITEM ECPKPARAMETERS_it = {
  .itype = ASN1_ITYPE_CHOICE,
  .utype = offsetof(ECPKPARAMETERS, type),
  .templates = ECPKPARAMETERS_ch_tt,
  .tcount = sizeof(ECPKPARAMETERS_ch_tt) / sizeof(ASN1_TEMPLATE),
  .funcs = NULL,
  .size = sizeof(ECPKPARAMETERS),
  .sname = "ECPKPARAMETERS",
};

ECPKPARAMETERS *ECPKPARAMETERS_new(void);
void ECPKPARAMETERS_free(ECPKPARAMETERS *a);
ECPKPARAMETERS *d2i_ECPKPARAMETERS(ECPKPARAMETERS **a, const unsigned char **in, long len);
int i2d_ECPKPARAMETERS(const ECPKPARAMETERS *a, unsigned char **out);

ECPKPARAMETERS *
d2i_ECPKPARAMETERS(ECPKPARAMETERS **a, const unsigned char **in, long len)
{
  return (ECPKPARAMETERS *)ASN1_item_d2i((ASN1_VALUE **)a, in, len,
      &ECPKPARAMETERS_it);
}

int
i2d_ECPKPARAMETERS(const ECPKPARAMETERS *a, unsigned char **out)
{
  return ASN1_item_i2d((ASN1_VALUE *)a, out, &ECPKPARAMETERS_it);
}

ECPKPARAMETERS *
ECPKPARAMETERS_new(void)
{
  return (ECPKPARAMETERS *)ASN1_item_new(&ECPKPARAMETERS_it);
}

void
ECPKPARAMETERS_free(ECPKPARAMETERS *a)
{
  ASN1_item_free((ASN1_VALUE *)a, &ECPKPARAMETERS_it);
}

static const ASN1_TEMPLATE EC_PRIVATEKEY_seq_tt[] = {
  {
    .flags = 0,
    .tag = 0,
    .offset = offsetof(EC_PRIVATEKEY, version),
    .field_name = "version",
    .item = &LONG_it,
  },
  {
    .flags = 0,
    .tag = 0,
    .offset = offsetof(EC_PRIVATEKEY, privateKey),
    .field_name = "privateKey",
    .item = &ASN1_OCTET_STRING_it,
  },
  {
    .flags = ASN1_TFLG_EXPLICIT | ASN1_TFLG_OPTIONAL,
    .tag = 0,
    .offset = offsetof(EC_PRIVATEKEY, parameters),
    .field_name = "parameters",
    .item = &ECPKPARAMETERS_it,
  },
  {
    .flags = ASN1_TFLG_EXPLICIT | ASN1_TFLG_OPTIONAL,
    .tag = 1,
    .offset = offsetof(EC_PRIVATEKEY, publicKey),
    .field_name = "publicKey",
    .item = &ASN1_BIT_STRING_it,
  },
};

const ASN1_ITEM EC_PRIVATEKEY_it = {
  .itype = ASN1_ITYPE_SEQUENCE,
  .utype = V_ASN1_SEQUENCE,
  .templates = EC_PRIVATEKEY_seq_tt,
  .tcount = sizeof(EC_PRIVATEKEY_seq_tt) / sizeof(ASN1_TEMPLATE),
  .funcs = NULL,
  .size = sizeof(EC_PRIVATEKEY),
  .sname = "EC_PRIVATEKEY",
};

EC_PRIVATEKEY *EC_PRIVATEKEY_new(void);
void EC_PRIVATEKEY_free(EC_PRIVATEKEY *a);
EC_PRIVATEKEY *d2i_EC_PRIVATEKEY(EC_PRIVATEKEY **a, const unsigned char **in, long len);
int i2d_EC_PRIVATEKEY(const EC_PRIVATEKEY *a, unsigned char **out);

EC_PRIVATEKEY *
d2i_EC_PRIVATEKEY(EC_PRIVATEKEY **a, const unsigned char **in, long len)
{
  return (EC_PRIVATEKEY *)ASN1_item_d2i((ASN1_VALUE **)a, in, len,
      &EC_PRIVATEKEY_it);
}

int
i2d_EC_PRIVATEKEY(const EC_PRIVATEKEY *a, unsigned char **out)
{
  return ASN1_item_i2d((ASN1_VALUE *)a, out, &EC_PRIVATEKEY_it);
}

EC_PRIVATEKEY *
EC_PRIVATEKEY_new(void)
{
  return (EC_PRIVATEKEY *)ASN1_item_new(&EC_PRIVATEKEY_it);
}

void
EC_PRIVATEKEY_free(EC_PRIVATEKEY *a)
{
  ASN1_item_free((ASN1_VALUE *)a, &EC_PRIVATEKEY_it);
}

/* 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) {
    ECerror(ERR_R_OBJ_LIB);
    goto err;
  }
  if (nid == NID_X9_62_prime_field) {
    if ((tmp = BN_new()) == NULL) {
      ECerror(ERR_R_MALLOC_FAILURE);
      goto err;
    }
    /* the parameters are specified by the prime number p */
    if (!EC_GROUP_get_curve(group, tmp, NULL, NULL, NULL)) {
      ECerror(ERR_R_EC_LIB);
      goto err;
    }
    /* set the prime number */
    field->p.prime = BN_to_ASN1_INTEGER(tmp, NULL);
    if (field->p.prime == NULL) {
      ECerror(ERR_R_ASN1_LIB);
      goto err;
    }
  } else      /* nid == NID_X9_62_characteristic_two_field */
#ifdef OPENSSL_NO_EC2M
  {
    ECerror(EC_R_GF2M_NOT_SUPPORTED);
    goto err;
  }
#else
  {
    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) {
      ECerror(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) {
      ECerror(ERR_R_EC_LIB);
      goto err;
    }
    /* set base type OID */
    if ((char_two->type = OBJ_nid2obj(field_type)) == NULL) {
      ECerror(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) {
        ECerror(ERR_R_MALLOC_FAILURE);
        goto err;
      }
      if (!ASN1_INTEGER_set(char_two->p.tpBasis, (long) k)) {
        ECerror(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) {
        ECerror(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) {
        ECerror(ERR_R_MALLOC_FAILURE);
        goto err;
      }
    }
  }
#endif

  ok = 1;

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

static int 
ec_asn1_group2curve(const EC_GROUP * group, X9_62_CURVE * curve)
{
  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;
  int ok = 0;

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

  if ((tmp_1 = BN_new()) == NULL || (tmp_2 = BN_new()) == NULL) {
    ECerror(ERR_R_MALLOC_FAILURE);
    goto err;
  }

  /* get a and b */
  if (!EC_GROUP_get_curve(group, NULL, tmp_1, tmp_2, NULL)) {
    ECerror(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 = malloc(len_1)) == NULL) {
      ECerror(ERR_R_MALLOC_FAILURE);
      goto err;
    }
    if ((len_1 = BN_bn2bin(tmp_1, buffer_1)) == 0) {
      ECerror(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 = malloc(len_2)) == NULL) {
      ECerror(ERR_R_MALLOC_FAILURE);
      goto err;
    }
    if ((len_2 = BN_bn2bin(tmp_2, buffer_2)) == 0) {
      ECerror(ERR_R_BN_LIB);
      goto err;
    }
    b_buf = buffer_2;
  }

  /* set a and b */
  if (!ASN1_STRING_set(curve->a, a_buf, len_1) ||
      !ASN1_STRING_set(curve->b, b_buf, len_2)) {
    ECerror(ERR_R_ASN1_LIB);
    goto err;
  }

  ASN1_BIT_STRING_free(curve->seed);
  curve->seed = NULL;

  /* set the seed (optional) */
  if (group->seed != NULL) {
    if ((curve->seed = ASN1_BIT_STRING_new()) == NULL) {
      ECerror(ERR_R_MALLOC_FAILURE);
      goto err;
    }
    if (!ASN1_BIT_STRING_set(curve->seed, group->seed,
      (int) group->seed_len)) {
      ECerror(ERR_R_ASN1_LIB);
      goto err;
    }
    if (!asn1_abs_set_unused_bits(curve->seed, 0)) {
      ECerror(ERR_R_ASN1_LIB);
      goto err;
    }
  }

  ok = 1;

 err:
  free(buffer_1);
  free(buffer_2);
  BN_free(tmp_1);
  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) {
    ECerror(ERR_R_MALLOC_FAILURE);
    goto err;
  }
  if (param == NULL) {
    if ((ret = ECPARAMETERS_new()) == NULL) {
      ECerror(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)) {
    ECerror(ERR_R_EC_LIB);
    goto err;
  }
  /* set the curve */
  if (!ec_asn1_group2curve(group, ret->curve)) {
    ECerror(ERR_R_EC_LIB);
    goto err;
  }
  /* set the base point */
  if ((point = EC_GROUP_get0_generator(group)) == NULL) {
    ECerror(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) {
    ECerror(ERR_R_EC_LIB);
    goto err;
  }
  if ((buffer = malloc(len)) == NULL) {
    ECerror(ERR_R_MALLOC_FAILURE);
    goto err;
  }
  if (!EC_POINT_point2oct(group, point, form, buffer, len, NULL)) {
    ECerror(ERR_R_EC_LIB);
    goto err;
  }
  if (ret->base == NULL && (ret->base = ASN1_OCTET_STRING_new()) == NULL) {
    ECerror(ERR_R_MALLOC_FAILURE);
    goto err;
  }
  if (!ASN1_OCTET_STRING_set(ret->base, buffer, len)) {
    ECerror(ERR_R_ASN1_LIB);
    goto err;
  }
  /* set the order */
  if (!EC_GROUP_get_order(group, tmp, NULL)) {
    ECerror(ERR_R_EC_LIB);
    goto err;
  }
  ret->order = BN_to_ASN1_INTEGER(tmp, ret->order);
  if (ret->order == NULL) {
    ECerror(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) {
      ECerror(ERR_R_ASN1_LIB);
      goto err;
    }
  }
  ok = 1;

 err:
  if (!ok) {
    if (ret && !param)
      ECPARAMETERS_free(ret);
    ret = NULL;
  }
  BN_free(tmp);
  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) {
      ECerror(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 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 know the group => 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;
  long field_bits;

  if (!params->fieldID || !params->fieldID->fieldType ||
      !params->fieldID->p.ptr) {
    ECerror(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) {
    ECerror(EC_R_ASN1_ERROR);
    goto err;
  }
  a = BN_bin2bn(params->curve->a->data, params->curve->a->length, NULL);
  if (a == NULL) {
    ECerror(ERR_R_BN_LIB);
    goto err;
  }
  b = BN_bin2bn(params->curve->b->data, params->curve->b->length, NULL);
  if (b == NULL) {
    ECerror(ERR_R_BN_LIB);
    goto err;
  }
  /* get the field parameters */
  tmp = OBJ_obj2nid(params->fieldID->fieldType);
  if (tmp == NID_X9_62_characteristic_two_field)
#ifdef OPENSSL_NO_EC2M
  {
    ECerror(EC_R_GF2M_NOT_SUPPORTED);
    goto err;
  }
#else
  {
    X9_62_CHARACTERISTIC_TWO *char_two;

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

    field_bits = char_two->m;
    if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
      ECerror(EC_R_FIELD_TOO_LARGE);
      goto err;
    }
    if ((p = BN_new()) == NULL) {
      ECerror(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) {
        ECerror(EC_R_ASN1_ERROR);
        goto err;
      }
      tmp_long = ASN1_INTEGER_get(char_two->p.tpBasis);

      if (!(char_two->m > tmp_long && tmp_long > 0)) {
        ECerror(EC_R_INVALID_TRINOMIAL_BASIS);
        goto err;
      }
      /* 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) {
        ECerror(EC_R_ASN1_ERROR);
        goto err;
      }
      if (!(char_two->m > penta->k3 && penta->k3 > penta->k2 && penta->k2 > penta->k1 && penta->k1 > 0)) {
        ECerror(EC_R_INVALID_PENTANOMIAL_BASIS);
        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) {
      ECerror(EC_R_NOT_IMPLEMENTED);
      goto err;
    } else { /* error */
      ECerror(EC_R_ASN1_ERROR);
      goto err;
    }

    /* create the EC_GROUP structure */
    ret = EC_GROUP_new_curve_GF2m(p, a, b, NULL);
  }
#endif
  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) {
      ECerror(EC_R_ASN1_ERROR);
      goto err;
    }
    p = ASN1_INTEGER_to_BN(params->fieldID->p.prime, NULL);
    if (p == NULL) {
      ECerror(ERR_R_ASN1_LIB);
      goto err;
    }
    if (BN_is_negative(p) || BN_is_zero(p)) {
      ECerror(EC_R_INVALID_FIELD);
      goto err;
    }
    field_bits = BN_num_bits(p);
    if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
      ECerror(EC_R_FIELD_TOO_LARGE);
      goto err;
    }
    /* create the EC_GROUP structure */
    ret = EC_GROUP_new_curve_GFp(p, a, b, NULL);
  } else {
    ECerror(EC_R_INVALID_FIELD);
    goto err;
  }

  if (ret == NULL) {
    ECerror(ERR_R_EC_LIB);
    goto err;
  }
  /* extract seed (optional) */
  if (params->curve->seed != NULL) {
    free(ret->seed);
    if (!(ret->seed = malloc(params->curve->seed->length))) {
      ECerror(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) {
    ECerror(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)) {
    ECerror(ERR_R_EC_LIB);
    goto err;
  }
  /* extract the order */
  if ((a = ASN1_INTEGER_to_BN(params->order, a)) == NULL) {
    ECerror(ERR_R_ASN1_LIB);
    goto err;
  }
  if (BN_is_negative(a) || BN_is_zero(a)) {
    ECerror(EC_R_INVALID_GROUP_ORDER);
    goto err;
  }
  if (BN_num_bits(a) > (int) field_bits + 1) { /* Hasse bound */
    ECerror(EC_R_INVALID_GROUP_ORDER);
    goto err;
  }
  /* extract the cofactor (optional) */
  if (params->cofactor == NULL) {
    BN_free(b);
    b = NULL;
  } else if ((b = ASN1_INTEGER_to_BN(params->cofactor, b)) == NULL) {
    ECerror(ERR_R_ASN1_LIB);
    goto err;
  }
  /* set the generator, order and cofactor (if present) */
  if (!EC_GROUP_set_generator(ret, point, a, b)) {
    ECerror(ERR_R_EC_LIB);
    goto err;
  }
  ok = 1;

 err:
  if (!ok) {
    EC_GROUP_clear_free(ret);
    ret = NULL;
  }
  BN_free(p);
  BN_free(a);
  BN_free(b);
  EC_POINT_free(point);
  return (ret);
}

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

  if (params == NULL) {
    ECerror(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) {
      ECerror(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) {
      ECerror(ERR_R_EC_LIB);
      return NULL;
    }
    EC_GROUP_set_asn1_flag(ret, 0x0);
  } else if (params->type == 2) { /* implicitlyCA */
    return NULL;
  } else {
    ECerror(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;

  if ((params = d2i_ECPKPARAMETERS(NULL, in, len)) == NULL) {
    ECerror(EC_R_D2I_ECPKPARAMETERS_FAILURE);
    goto err;
  }
  if ((group = ec_asn1_pkparameters2group(params)) == NULL) {
    ECerror(EC_R_PKPARAMETERS2GROUP_FAILURE);
    goto err;
  }

  if (a != NULL) {
    EC_GROUP_clear_free(*a);
    *a = group;
  }

 err:
  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) {
    ECerror(EC_R_GROUP2PKPARAMETERS_FAILURE);
    return 0;
  }
  if ((ret = i2d_ECPKPARAMETERS(tmp, out)) == 0) {
    ECerror(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)
{
  EC_KEY *ret = NULL;
  EC_PRIVATEKEY *priv_key = NULL;

  if ((priv_key = d2i_EC_PRIVATEKEY(NULL, in, len)) == NULL) {
    ECerror(ERR_R_EC_LIB);
    return NULL;
  }
  if (a == NULL || *a == NULL) {
    if ((ret = EC_KEY_new()) == NULL) {
      ECerror(ERR_R_MALLOC_FAILURE);
      goto err;
    }
  } else
    ret = *a;

  if (priv_key->parameters) {
    EC_GROUP_clear_free(ret->group);
    ret->group = ec_asn1_pkparameters2group(priv_key->parameters);
  }
  if (ret->group == NULL) {
    ECerror(ERR_R_EC_LIB);
    goto err;
  }
  ret->version = priv_key->version;

  if (priv_key->privateKey) {
    ret->priv_key = BN_bin2bn(
        ASN1_STRING_data(priv_key->privateKey),
        ASN1_STRING_length(priv_key->privateKey),
        ret->priv_key);
    if (ret->priv_key == NULL) {
      ECerror(ERR_R_BN_LIB);
      goto err;
    }
  } else {
    ECerror(EC_R_MISSING_PRIVATE_KEY);
    goto err;
  }

  if (ret->pub_key)
    EC_POINT_clear_free(ret->pub_key);
  ret->pub_key = EC_POINT_new(ret->group);
  if (ret->pub_key == NULL) {
    ECerror(ERR_R_EC_LIB);
    goto err;
  }

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

    pub_oct = ASN1_STRING_data(priv_key->publicKey);
    pub_oct_len = ASN1_STRING_length(priv_key->publicKey);
    if (pub_oct == NULL || pub_oct_len <= 0) {
      ECerror(EC_R_BUFFER_TOO_SMALL);
      goto err;
    }

    /* 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)) {
      ECerror(ERR_R_EC_LIB);
      goto err;
    }
  } else {
    if (!EC_POINT_mul(ret->group, ret->pub_key, ret->priv_key,
      NULL, NULL, NULL)) {
      ECerror(ERR_R_EC_LIB);
      goto err;
    }
    /* Remember the original private-key-only encoding. */
    ret->enc_flag |= EC_PKEY_NO_PUBKEY;
  }

  EC_PRIVATEKEY_free(priv_key);
  if (a != NULL)
    *a = ret;
  return (ret);

 err:
  if (a == NULL || *a != ret)
    EC_KEY_free(ret);
  if (priv_key)
    EC_PRIVATEKEY_free(priv_key);

  return (NULL);
}

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 ||
      (!(a->enc_flag & EC_PKEY_NO_PUBKEY) && a->pub_key == NULL)) {
    ECerror(ERR_R_PASSED_NULL_PARAMETER);
    goto err;
  }
  if ((priv_key = EC_PRIVATEKEY_new()) == NULL) {
    ECerror(ERR_R_MALLOC_FAILURE);
    goto err;
  }
  priv_key->version = a->version;

  buf_len = (size_t) BN_num_bytes(a->priv_key);
  buffer = malloc(buf_len);
  if (buffer == NULL) {
    ECerror(ERR_R_MALLOC_FAILURE);
    goto err;
  }
  if (!BN_bn2bin(a->priv_key, buffer)) {
    ECerror(ERR_R_BN_LIB);
    goto err;
  }
  if (!ASN1_STRING_set(priv_key->privateKey, buffer, buf_len)) {
    ECerror(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) {
      ECerror(ERR_R_EC_LIB);
      goto err;
    }
  }
  if (!(a->enc_flag & EC_PKEY_NO_PUBKEY) && a->pub_key != NULL) {
    priv_key->publicKey = ASN1_BIT_STRING_new();
    if (priv_key->publicKey == NULL) {
      ECerror(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 = realloc(buffer, tmp_len);
      if (!tmp_buffer) {
        ECerror(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)) {
      ECerror(ERR_R_EC_LIB);
      goto err;
    }
    if (!ASN1_STRING_set(priv_key->publicKey, buffer, buf_len)) {
      ECerror(ERR_R_ASN1_LIB);
      goto err;
    }
    if (!asn1_abs_set_unused_bits(priv_key->publicKey, 0)) {
      ECerror(ERR_R_ASN1_LIB);
      goto err;
    }
  }
  if ((ret = i2d_EC_PRIVATEKEY(priv_key, out)) == 0) {
    ECerror(ERR_R_EC_LIB);
    goto err;
  }
  ok = 1;
 err:
  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) {
    ECerror(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) {
    ECerror(ERR_R_PASSED_NULL_PARAMETER);
    return NULL;
  }
  if (a == NULL || *a == NULL) {
    if ((ret = EC_KEY_new()) == NULL) {
      ECerror(ERR_R_MALLOC_FAILURE);
      return NULL;
    }
  } else
    ret = *a;

  if (!d2i_ECPKParameters(&ret->group, in, len)) {
    ECerror(ERR_R_EC_LIB);
    if (a == NULL || *a != ret)
      EC_KEY_free(ret);
    return NULL;
  }

  if (a != NULL)
    *a = ret;
  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) {
    /* An EC_GROUP structure is necessary to set the public key. */
    ECerror(ERR_R_PASSED_NULL_PARAMETER);
    return 0;
  }
  ret = *a;
  if (ret->pub_key == NULL &&
      (ret->pub_key = EC_POINT_new(ret->group)) == NULL) {
    ECerror(ERR_R_MALLOC_FAILURE);
    return 0;
  }
  if (!EC_POINT_oct2point(ret->group, ret->pub_key, *in, len, NULL)) {
    ECerror(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(const EC_KEY * a, unsigned char **out)
{
  size_t buf_len = 0;
  int new_buffer = 0;

  if (a == NULL) {
    ECerror(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 = malloc(buf_len)) == NULL) {
      ECerror(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)) {
    ECerror(ERR_R_EC_LIB);
    if (new_buffer) {
      free(*out);
      *out = NULL;
    }
    return 0;
  }
  if (!new_buffer)
    *out += buf_len;
  return buf_len;
}

Coverage Report

Created: 2022-08-24 06:30