text: /*
   * Copyright 2002-2022 The OpenSSL Project Authors. All Rights Reserved.
   * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
   *
   * Licensed under the Apache License 2.0 (the "License").  You may not use
   * this file except in compliance with the License.  You can obtain a copy
   * in the file LICENSE in the source distribution or at
   * https://www.openssl.org/source/license.html
   */
  
  #ifndef OPENSSL_EC_H
  # define OPENSSL_EC_H
  # pragma once
  
  # include <openssl/macros.h>
  # ifndef OPENSSL_NO_DEPRECATED_3_0
  #  define HEADER_EC_H
  # endif
  
  # include <openssl/opensslconf.h>
  # include <openssl/types.h>
  
  # include <string.h>
  
  # ifdef  __cplusplus
  extern "C" {
  # endif
  
  /* Values for EVP_PKEY_CTX_set_ec_param_enc() */
  # define OPENSSL_EC_EXPLICIT_CURVE  0x000
  # define OPENSSL_EC_NAMED_CURVE     0x001
  
  int EVP_PKEY_CTX_set_ec_paramgen_curve_nid(EVP_PKEY_CTX *ctx, int nid);
  int EVP_PKEY_CTX_set_ec_param_enc(EVP_PKEY_CTX *ctx, int param_enc);
  int EVP_PKEY_CTX_set_ecdh_cofactor_mode(EVP_PKEY_CTX *ctx, int cofactor_mode);
  int EVP_PKEY_CTX_get_ecdh_cofactor_mode(EVP_PKEY_CTX *ctx);
  
  int EVP_PKEY_CTX_set_ecdh_kdf_type(EVP_PKEY_CTX *ctx, int kdf);
  int EVP_PKEY_CTX_get_ecdh_kdf_type(EVP_PKEY_CTX *ctx);
  
  int EVP_PKEY_CTX_set_ecdh_kdf_md(EVP_PKEY_CTX *ctx, const EVP_MD *md);
  int EVP_PKEY_CTX_get_ecdh_kdf_md(EVP_PKEY_CTX *ctx, const EVP_MD **md);
  
  int EVP_PKEY_CTX_set_ecdh_kdf_outlen(EVP_PKEY_CTX *ctx, int len);
  int EVP_PKEY_CTX_get_ecdh_kdf_outlen(EVP_PKEY_CTX *ctx, int *len);
  
  int EVP_PKEY_CTX_set0_ecdh_kdf_ukm(EVP_PKEY_CTX *ctx, unsigned char *ukm,
                                     int len);
  # ifndef OPENSSL_NO_DEPRECATED_3_0
  OSSL_DEPRECATEDIN_3_0
  int EVP_PKEY_CTX_get0_ecdh_kdf_ukm(EVP_PKEY_CTX *ctx, unsigned char **ukm);
  # endif
  
  # define EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID    (EVP_PKEY_ALG_CTRL + 1)
  # define EVP_PKEY_CTRL_EC_PARAM_ENC             (EVP_PKEY_ALG_CTRL + 2)
  # define EVP_PKEY_CTRL_EC_ECDH_COFACTOR         (EVP_PKEY_ALG_CTRL + 3)
  # define EVP_PKEY_CTRL_EC_KDF_TYPE              (EVP_PKEY_ALG_CTRL + 4)
  # define EVP_PKEY_CTRL_EC_KDF_MD                (EVP_PKEY_ALG_CTRL + 5)
  # define EVP_PKEY_CTRL_GET_EC_KDF_MD            (EVP_PKEY_ALG_CTRL + 6)
  # define EVP_PKEY_CTRL_EC_KDF_OUTLEN            (EVP_PKEY_ALG_CTRL + 7)
  # define EVP_PKEY_CTRL_GET_EC_KDF_OUTLEN        (EVP_PKEY_ALG_CTRL + 8)
  # define EVP_PKEY_CTRL_EC_KDF_UKM               (EVP_PKEY_ALG_CTRL + 9)
  # define EVP_PKEY_CTRL_GET_EC_KDF_UKM           (EVP_PKEY_ALG_CTRL + 10)
  
  /* KDF types */
  # define EVP_PKEY_ECDH_KDF_NONE                      1
  # define EVP_PKEY_ECDH_KDF_X9_63                     2
  /*
   * The old name for EVP_PKEY_ECDH_KDF_X9_63
   *  The ECDH KDF specification has been mistakenly attributed to ANSI X9.62,
   *  it is actually specified in ANSI X9.63.
   *  This identifier is retained for backwards compatibility
   */
  # define EVP_PKEY_ECDH_KDF_X9_62   EVP_PKEY_ECDH_KDF_X9_63
  
  /** Enum for the point conversion form as defined in X9.62 (ECDSA)
   *  for the encoding of a elliptic curve point (x,y) */
  typedef enum {
          /** the point is encoded as z||x, where the octet z specifies
           *  which solution of the quadratic equation y is  */
      POINT_CONVERSION_COMPRESSED = 2,
          /** the point is encoded as z||x||y, where z is the octet 0x04  */
      POINT_CONVERSION_UNCOMPRESSED = 4,
          /** the point is encoded as z||x||y, where the octet z specifies
           *  which solution of the quadratic equation y is  */
      POINT_CONVERSION_HYBRID = 6
  } point_conversion_form_t;
  
  const char *OSSL_EC_curve_nid2name(int nid);
  
  # ifndef OPENSSL_NO_EC
  #  include <openssl/asn1.h>
  #  include <openssl/symhacks.h>
  #  ifndef OPENSSL_NO_DEPRECATED_1_1_0
  #   include <openssl/bn.h>
  #  endif
  #  include <openssl/ecerr.h>
  
  #  ifndef OPENSSL_ECC_MAX_FIELD_BITS
  #   define OPENSSL_ECC_MAX_FIELD_BITS 661
  #  endif
  
  #  include <openssl/params.h>
  #  ifndef OPENSSL_NO_DEPRECATED_3_0
  typedef struct ec_method_st EC_METHOD;
  #  endif
  typedef struct ec_group_st EC_GROUP;
  typedef struct ec_point_st EC_POINT;
  typedef struct ecpk_parameters_st ECPKPARAMETERS;
  typedef struct ec_parameters_st ECPARAMETERS;
  
  /********************************************************************/
  /*               EC_METHODs for curves over GF(p)                   */
  /********************************************************************/
  
  #  ifndef OPENSSL_NO_DEPRECATED_3_0
  /** Returns the basic GFp ec methods which provides the basis for the
   *  optimized methods.
   *  \return  EC_METHOD object
   */
  OSSL_DEPRECATEDIN_3_0 const EC_METHOD *EC_GFp_simple_method(void);
  
  /** Returns GFp methods using montgomery multiplication.
   *  \return  EC_METHOD object
   */
  OSSL_DEPRECATEDIN_3_0 const EC_METHOD *EC_GFp_mont_method(void);
  
  /** Returns GFp methods using optimized methods for NIST recommended curves
   *  \return  EC_METHOD object
   */
  OSSL_DEPRECATEDIN_3_0 const EC_METHOD *EC_GFp_nist_method(void);
  
  #   ifndef OPENSSL_NO_EC_NISTP_64_GCC_128
  /** Returns 64-bit optimized methods for nistp224
   *  \return  EC_METHOD object
   */
  OSSL_DEPRECATEDIN_3_0 const EC_METHOD *EC_GFp_nistp224_method(void);
  
  /** Returns 64-bit optimized methods for nistp256
   *  \return  EC_METHOD object
   */
  OSSL_DEPRECATEDIN_3_0 const EC_METHOD *EC_GFp_nistp256_method(void);
  
  /** Returns 64-bit optimized methods for nistp521
   *  \return  EC_METHOD object
   */
  OSSL_DEPRECATEDIN_3_0 const EC_METHOD *EC_GFp_nistp521_method(void);
  #   endif /* OPENSSL_NO_EC_NISTP_64_GCC_128 */
  
  #   ifndef OPENSSL_NO_EC2M
  /********************************************************************/
  /*           EC_METHOD for curves over GF(2^m)                      */
  /********************************************************************/
  
  /** Returns the basic GF2m ec method
   *  \return  EC_METHOD object
   */
  OSSL_DEPRECATEDIN_3_0 const EC_METHOD *EC_GF2m_simple_method(void);
  
  #   endif
  
  /********************************************************************/
  /*                   EC_GROUP functions                             */
  /********************************************************************/
  
  /**
   *  Creates a new EC_GROUP object
   *  \param   meth   EC_METHOD to use
   *  \return  newly created EC_GROUP object or NULL in case of an error.
   */
  OSSL_DEPRECATEDIN_3_0 EC_GROUP *EC_GROUP_new(const EC_METHOD *meth);
  
  /** Clears and frees a EC_GROUP object
   *  \param  group  EC_GROUP object to be cleared and freed.
   */
  OSSL_DEPRECATEDIN_3_0 void EC_GROUP_clear_free(EC_GROUP *group);
  
  /** Returns the EC_METHOD of the EC_GROUP object.
   *  \param  group  EC_GROUP object
   *  \return EC_METHOD used in this EC_GROUP object.
   */
  OSSL_DEPRECATEDIN_3_0 const EC_METHOD *EC_GROUP_method_of(const EC_GROUP *group);
  
  /** Returns the field type of the EC_METHOD.
   *  \param  meth  EC_METHOD object
   *  \return NID of the underlying field type OID.
   */
  OSSL_DEPRECATEDIN_3_0 int EC_METHOD_get_field_type(const EC_METHOD *meth);
  #  endif /* OPENSSL_NO_DEPRECATED_3_0 */
  
  /** Frees a EC_GROUP object
   *  \param  group  EC_GROUP object to be freed.
   */
  void EC_GROUP_free(EC_GROUP *group);
  
  /** Copies EC_GROUP objects. Note: both EC_GROUPs must use the same EC_METHOD.
   *  \param  dst  destination EC_GROUP object
   *  \param  src  source EC_GROUP object
   *  \return 1 on success and 0 if an error occurred.
   */
  int EC_GROUP_copy(EC_GROUP *dst, const EC_GROUP *src);
  
  /** Creates a new EC_GROUP object and copies the content
   *  form src to the newly created EC_KEY object
   *  \param  src  source EC_GROUP object
   *  \return newly created EC_GROUP object or NULL in case of an error.
   */
  EC_GROUP *EC_GROUP_dup(const EC_GROUP *src);
  
  /** Sets the generator and its order/cofactor of a EC_GROUP object.
   *  \param  group      EC_GROUP object
   *  \param  generator  EC_POINT object with the generator.
   *  \param  order      the order of the group generated by the generator.
   *  \param  cofactor   the index of the sub-group generated by the generator
   *                     in the group of all points on the elliptic curve.
   *  \return 1 on success and 0 if an error occurred
   */
  int EC_GROUP_set_generator(EC_GROUP *group, const EC_POINT *generator,
                             const BIGNUM *order, const BIGNUM *cofactor);
  
  /** Returns the generator of a EC_GROUP object.
   *  \param  group  EC_GROUP object
   *  \return the currently used generator (possibly NULL).
   */
  const EC_POINT *EC_GROUP_get0_generator(const EC_GROUP *group);
  
  /** Returns the montgomery data for order(Generator)
   *  \param  group  EC_GROUP object
   *  \return the currently used montgomery data (possibly NULL).
  */
  BN_MONT_CTX *EC_GROUP_get_mont_data(const EC_GROUP *group);
  
  /** Gets the order of a EC_GROUP
   *  \param  group  EC_GROUP object
   *  \param  order  BIGNUM to which the order is copied
   *  \param  ctx    unused
   *  \return 1 on success and 0 if an error occurred
   */
  int EC_GROUP_get_order(const EC_GROUP *group, BIGNUM *order, BN_CTX *ctx);
  
  /** Gets the order of an EC_GROUP
   *  \param  group  EC_GROUP object
   *  \return the group order
   */
  const BIGNUM *EC_GROUP_get0_order(const EC_GROUP *group);
  
  /** Gets the number of bits of the order of an EC_GROUP
   *  \param  group  EC_GROUP object
   *  \return number of bits of group order.
   */
  int EC_GROUP_order_bits(const EC_GROUP *group);
  
  /** Gets the cofactor of a EC_GROUP
   *  \param  group     EC_GROUP object
   *  \param  cofactor  BIGNUM to which the cofactor is copied
   *  \param  ctx       unused
   *  \return 1 on success and 0 if an error occurred
   */
  int EC_GROUP_get_cofactor(const EC_GROUP *group, BIGNUM *cofactor,
                            BN_CTX *ctx);
  
  /** Gets the cofactor of an EC_GROUP
   *  \param  group  EC_GROUP object
   *  \return the group cofactor
   */
  const BIGNUM *EC_GROUP_get0_cofactor(const EC_GROUP *group);
  
  /** Sets the name of a EC_GROUP object
   *  \param  group  EC_GROUP object
   *  \param  nid    NID of the curve name OID
   */
  void EC_GROUP_set_curve_name(EC_GROUP *group, int nid);
  
  /** Returns the curve name of a EC_GROUP object
   *  \param  group  EC_GROUP object
   *  \return NID of the curve name OID or 0 if not set.
   */
  int EC_GROUP_get_curve_name(const EC_GROUP *group);
  
  /** Gets the field of an EC_GROUP
   *  \param  group  EC_GROUP object
   *  \return the group field
   */
  const BIGNUM *EC_GROUP_get0_field(const EC_GROUP *group);
  
  /** Returns the field type of the EC_GROUP.
   *  \param  group  EC_GROUP object
   *  \return NID of the underlying field type OID.
   */
  int EC_GROUP_get_field_type(const EC_GROUP *group);
  
  void EC_GROUP_set_asn1_flag(EC_GROUP *group, int flag);
  int EC_GROUP_get_asn1_flag(const EC_GROUP *group);
  
  void EC_GROUP_set_point_conversion_form(EC_GROUP *group,
                                          point_conversion_form_t form);
  point_conversion_form_t EC_GROUP_get_point_conversion_form(const EC_GROUP *);
  
  unsigned char *EC_GROUP_get0_seed(const EC_GROUP *x);
  size_t EC_GROUP_get_seed_len(const EC_GROUP *);
  size_t EC_GROUP_set_seed(EC_GROUP *, const unsigned char *, size_t len);
  
  /** Sets the parameters of an ec curve defined by y^2 = x^3 + a*x + b (for GFp)
   *  or y^2 + x*y = x^3 + a*x^2 + b (for GF2m)
   *  \param  group  EC_GROUP object
   *  \param  p      BIGNUM with the prime number (GFp) or the polynomial
   *                 defining the underlying field (GF2m)
   *  \param  a      BIGNUM with parameter a of the equation
   *  \param  b      BIGNUM with parameter b of the equation
   *  \param  ctx    BN_CTX object (optional)
   *  \return 1 on success and 0 if an error occurred
   */
  int EC_GROUP_set_curve(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a,
                         const BIGNUM *b, BN_CTX *ctx);
  
  /** Gets the parameters of the ec curve defined by y^2 = x^3 + a*x + b (for GFp)
   *  or y^2 + x*y = x^3 + a*x^2 + b (for GF2m)
   *  \param  group  EC_GROUP object
   *  \param  p      BIGNUM with the prime number (GFp) or the polynomial
   *                 defining the underlying field (GF2m)
   *  \param  a      BIGNUM for parameter a of the equation
   *  \param  b      BIGNUM for parameter b of the equation
   *  \param  ctx    BN_CTX object (optional)
   *  \return 1 on success and 0 if an error occurred
   */
  int EC_GROUP_get_curve(const EC_GROUP *group, BIGNUM *p, BIGNUM *a, BIGNUM *b,
                         BN_CTX *ctx);
  
  #  ifndef OPENSSL_NO_DEPRECATED_3_0
  /** Sets the parameters of an ec curve. Synonym for EC_GROUP_set_curve
   *  \param  group  EC_GROUP object
   *  \param  p      BIGNUM with the prime number (GFp) or the polynomial
   *                 defining the underlying field (GF2m)
   *  \param  a      BIGNUM with parameter a of the equation
   *  \param  b      BIGNUM with parameter b of the equation
   *  \param  ctx    BN_CTX object (optional)
   *  \return 1 on success and 0 if an error occurred
   */
  OSSL_DEPRECATEDIN_3_0 int EC_GROUP_set_curve_GFp(EC_GROUP *group,
                                                   const BIGNUM *p,
                                                   const BIGNUM *a,
                                                   const BIGNUM *b,
                                                   BN_CTX *ctx);
  
  /** Gets the parameters of an ec curve. Synonym for EC_GROUP_get_curve
   *  \param  group  EC_GROUP object
   *  \param  p      BIGNUM with the prime number (GFp) or the polynomial
   *                 defining the underlying field (GF2m)
   *  \param  a      BIGNUM for parameter a of the equation
   *  \param  b      BIGNUM for parameter b of the equation
   *  \param  ctx    BN_CTX object (optional)
   *  \return 1 on success and 0 if an error occurred
   */
  OSSL_DEPRECATEDIN_3_0 int EC_GROUP_get_curve_GFp(const EC_GROUP *group,
                                                   BIGNUM *p,
                                                   BIGNUM *a, BIGNUM *b,
                                                   BN_CTX *ctx);
  
  #   ifndef OPENSSL_NO_EC2M
  /** Sets the parameter of an ec curve. Synonym for EC_GROUP_set_curve
   *  \param  group  EC_GROUP object
   *  \param  p      BIGNUM with the prime number (GFp) or the polynomial
   *                 defining the underlying field (GF2m)
   *  \param  a      BIGNUM with parameter a of the equation
   *  \param  b      BIGNUM with parameter b of the equation
   *  \param  ctx    BN_CTX object (optional)
   *  \return 1 on success and 0 if an error occurred
   */
  OSSL_DEPRECATEDIN_3_0 int EC_GROUP_set_curve_GF2m(EC_GROUP *group,
                                                    const BIGNUM *p,
                                                    const BIGNUM *a,
                                                    const BIGNUM *b,
                                                    BN_CTX *ctx);
  
  /** Gets the parameters of an ec curve. Synonym for EC_GROUP_get_curve
   *  \param  group  EC_GROUP object
   *  \param  p      BIGNUM with the prime number (GFp) or the polynomial
   *                 defining the underlying field (GF2m)
   *  \param  a      BIGNUM for parameter a of the equation
   *  \param  b      BIGNUM for parameter b of the equation
   *  \param  ctx    BN_CTX object (optional)
   *  \return 1 on success and 0 if an error occurred
   */
  OSSL_DEPRECATEDIN_3_0 int EC_GROUP_get_curve_GF2m(const EC_GROUP *group,
                                                    BIGNUM *p,
                                                    BIGNUM *a, BIGNUM *b,
                                                    BN_CTX *ctx);
  #   endif /* OPENSSL_NO_EC2M */
  #  endif /* OPENSSL_NO_DEPRECATED_3_0 */
  
  /** Returns the number of bits needed to represent a field element
   *  \param  group  EC_GROUP object
   *  \return number of bits needed to represent a field element
   */
  int EC_GROUP_get_degree(const EC_GROUP *group);
  
  /** Checks whether the parameter in the EC_GROUP define a valid ec group
   *  \param  group  EC_GROUP object
   *  \param  ctx    BN_CTX object (optional)
   *  \return 1 if group is a valid ec group and 0 otherwise
   */
  int EC_GROUP_check(const EC_GROUP *group, BN_CTX *ctx);
  
  /** Checks whether the discriminant of the elliptic curve is zero or not
   *  \param  group  EC_GROUP object
   *  \param  ctx    BN_CTX object (optional)
   *  \return 1 if the discriminant is not zero and 0 otherwise
   */
  int EC_GROUP_check_discriminant(const EC_GROUP *group, BN_CTX *ctx);
  
  /** Compares two EC_GROUP objects
   *  \param  a    first EC_GROUP object
   *  \param  b    second EC_GROUP object
   *  \param  ctx  BN_CTX object (optional)
   *  \return 0 if the groups are equal, 1 if not, or -1 on error
   */
  int EC_GROUP_cmp(const EC_GROUP *a, const EC_GROUP *b, BN_CTX *ctx);
  
  /*
   * EC_GROUP_new_GF*() calls EC_GROUP_new() and EC_GROUP_set_GF*() after
   * choosing an appropriate EC_METHOD
   */
  
  /** Creates a new EC_GROUP object with the specified parameters defined
   *  over GFp (defined by the equation y^2 = x^3 + a*x + b)
   *  \param  p    BIGNUM with the prime number
   *  \param  a    BIGNUM with the parameter a of the equation
   *  \param  b    BIGNUM with the parameter b of the equation
   *  \param  ctx  BN_CTX object (optional)
   *  \return newly created EC_GROUP object with the specified parameters
   */
  EC_GROUP *EC_GROUP_new_curve_GFp(const BIGNUM *p, const BIGNUM *a,
                                   const BIGNUM *b, BN_CTX *ctx);
  #  ifndef OPENSSL_NO_EC2M
  /** Creates a new EC_GROUP object with the specified parameters defined
   *  over GF2m (defined by the equation y^2 + x*y = x^3 + a*x^2 + b)
   *  \param  p    BIGNUM with the polynomial defining the underlying field
   *  \param  a    BIGNUM with the parameter a of the equation
   *  \param  b    BIGNUM with the parameter b of the equation
   *  \param  ctx  BN_CTX object (optional)
   *  \return newly created EC_GROUP object with the specified parameters
   */
  EC_GROUP *EC_GROUP_new_curve_GF2m(const BIGNUM *p, const BIGNUM *a,
                                    const BIGNUM *b, BN_CTX *ctx);
  #  endif
  
  /**
   * Creates a EC_GROUP object with a curve specified by parameters.
   * The parameters may be explicit or a named curve,
   *  \param  params A list of parameters describing the group.
   *  \param  libctx The associated library context or NULL for the default
   *                 context
   *  \param  propq  A property query string
   *  \return newly created EC_GROUP object with specified parameters or NULL
   *          if an error occurred
   */
  EC_GROUP *EC_GROUP_new_from_params(const OSSL_PARAM params[],
                                     OSSL_LIB_CTX *libctx, const char *propq);
  
  /**
   * Creates a EC_GROUP object with a curve specified by a NID
   *  \param  libctx The associated library context or NULL for the default
   *                 context
   *  \param  propq  A property query string
   *  \param  nid    NID of the OID of the curve name
   *  \return newly created EC_GROUP object with specified curve or NULL
   *          if an error occurred
   */
  EC_GROUP *EC_GROUP_new_by_curve_name_ex(OSSL_LIB_CTX *libctx, const char *propq,
                                          int nid);
  
  /**
   * Creates a EC_GROUP object with a curve specified by a NID. Same as
   * EC_GROUP_new_by_curve_name_ex but the libctx and propq are always
   * NULL.
   *  \param  nid    NID of the OID of the curve name
   *  \return newly created EC_GROUP object with specified curve or NULL
   *          if an error occurred
   */
  EC_GROUP *EC_GROUP_new_by_curve_name(int nid);
  
  /** Creates a new EC_GROUP object from an ECPARAMETERS object
   *  \param  params  pointer to the ECPARAMETERS object
   *  \return newly created EC_GROUP object with specified curve or NULL
   *          if an error occurred
   */
  EC_GROUP *EC_GROUP_new_from_ecparameters(const ECPARAMETERS *params);
  
  /** Creates an ECPARAMETERS object for the given EC_GROUP object.
   *  \param  group   pointer to the EC_GROUP object
   *  \param  params  pointer to an existing ECPARAMETERS object or NULL
   *  \return pointer to the new ECPARAMETERS object or NULL
   *          if an error occurred.
   */
  ECPARAMETERS *EC_GROUP_get_ecparameters(const EC_GROUP *group,
                                          ECPARAMETERS *params);
  
  /** Creates a new EC_GROUP object from an ECPKPARAMETERS object
   *  \param  params  pointer to an existing ECPKPARAMETERS object, or NULL
   *  \return newly created EC_GROUP object with specified curve, or NULL
   *          if an error occurred
   */
  EC_GROUP *EC_GROUP_new_from_ecpkparameters(const ECPKPARAMETERS *params);
  
  /** Creates an ECPKPARAMETERS object for the given EC_GROUP object.
   *  \param  group   pointer to the EC_GROUP object
   *  \param  params  pointer to an existing ECPKPARAMETERS object or NULL
   *  \return pointer to the new ECPKPARAMETERS object or NULL
   *          if an error occurred.
   */
  ECPKPARAMETERS *EC_GROUP_get_ecpkparameters(const EC_GROUP *group,
                                              ECPKPARAMETERS *params);
  
  /********************************************************************/
  /*               handling of internal curves                        */
  /********************************************************************/
  
  typedef struct {
      int nid;
      const char *comment;
  } EC_builtin_curve;
  
  /*
   * EC_builtin_curves(EC_builtin_curve *r, size_t size) returns number of all
   * available curves or zero if a error occurred. In case r is not zero,
   * nitems EC_builtin_curve structures are filled with the data of the first
   * nitems internal groups
   */
  size_t EC_get_builtin_curves(EC_builtin_curve *r, size_t nitems);
  
  const char *EC_curve_nid2nist(int nid);
  int EC_curve_nist2nid(const char *name);
  int EC_GROUP_check_named_curve(const EC_GROUP *group, int nist_only,
                                 BN_CTX *ctx);
  
  /********************************************************************/
  /*                    EC_POINT functions                            */
  /********************************************************************/
  
  /** Creates a new EC_POINT object for the specified EC_GROUP
   *  \param  group  EC_GROUP the underlying EC_GROUP object
   *  \return newly created EC_POINT object or NULL if an error occurred
   */
  EC_POINT *EC_POINT_new(const EC_GROUP *group);
  
  /** Frees a EC_POINT object
   *  \param  point  EC_POINT object to be freed
   */
  void EC_POINT_free(EC_POINT *point);
  
  /** Clears and frees a EC_POINT object
   *  \param  point  EC_POINT object to be cleared and freed
   */
  void EC_POINT_clear_free(EC_POINT *point);
  
  /** Copies EC_POINT object
   *  \param  dst  destination EC_POINT object
   *  \param  src  source EC_POINT object
   *  \return 1 on success and 0 if an error occurred
   */
  int EC_POINT_copy(EC_POINT *dst, const EC_POINT *src);
  
  /** Creates a new EC_POINT object and copies the content of the supplied
   *  EC_POINT
   *  \param  src    source EC_POINT object
   *  \param  group  underlying the EC_GROUP object
   *  \return newly created EC_POINT object or NULL if an error occurred
   */
  EC_POINT *EC_POINT_dup(const EC_POINT *src, const EC_GROUP *group);
  
  /** Sets a point to infinity (neutral element)
   *  \param  group  underlying EC_GROUP object
   *  \param  point  EC_POINT to set to infinity
   *  \return 1 on success and 0 if an error occurred
   */
  int EC_POINT_set_to_infinity(const EC_GROUP *group, EC_POINT *point);
  
  #  ifndef OPENSSL_NO_DEPRECATED_3_0
  /** Returns the EC_METHOD used in EC_POINT object
   *  \param  point  EC_POINT object
   *  \return the EC_METHOD used
   */
  OSSL_DEPRECATEDIN_3_0 const EC_METHOD *EC_POINT_method_of(const EC_POINT *point);
  
  /** Sets the jacobian projective coordinates of a EC_POINT over GFp
   *  \param  group  underlying EC_GROUP object
   *  \param  p      EC_POINT object
   *  \param  x      BIGNUM with the x-coordinate
   *  \param  y      BIGNUM with the y-coordinate
   *  \param  z      BIGNUM with the z-coordinate
   *  \param  ctx    BN_CTX object (optional)
   *  \return 1 on success and 0 if an error occurred
   */
  OSSL_DEPRECATEDIN_3_0 int EC_POINT_set_Jprojective_coordinates_GFp
                        (const EC_GROUP *group, EC_POINT *p,
                         const BIGNUM *x, const BIGNUM *y, const BIGNUM *z,
                         BN_CTX *ctx);
  
  /** Gets the jacobian projective coordinates of a EC_POINT over GFp
   *  \param  group  underlying EC_GROUP object
   *  \param  p      EC_POINT object
   *  \param  x      BIGNUM for the x-coordinate
   *  \param  y      BIGNUM for the y-coordinate
   *  \param  z      BIGNUM for the z-coordinate
   *  \param  ctx    BN_CTX object (optional)
   *  \return 1 on success and 0 if an error occurred
   */
  OSSL_DEPRECATEDIN_3_0 int EC_POINT_get_Jprojective_coordinates_GFp
                        (const EC_GROUP *group, const EC_POINT *p,
                         BIGNUM *x, BIGNUM *y, BIGNUM *z, BN_CTX *ctx);
  #  endif /* OPENSSL_NO_DEPRECATED_3_0 */
  
  /** Sets the affine coordinates of an EC_POINT
   *  \param  group  underlying EC_GROUP object
   *  \param  p      EC_POINT object
   *  \param  x      BIGNUM with the x-coordinate
   *  \param  y      BIGNUM with the y-coordinate
   *  \param  ctx    BN_CTX object (optional)
   *  \return 1 on success and 0 if an error occurred
   */
  int EC_POINT_set_affine_coordinates(const EC_GROUP *group, EC_POINT *p,
                                      const BIGNUM *x, const BIGNUM *y,
                                      BN_CTX *ctx);
  
  /** Gets the affine coordinates of an EC_POINT.
   *  \param  group  underlying EC_GROUP object
   *  \param  p      EC_POINT object
   *  \param  x      BIGNUM for the x-coordinate
   *  \param  y      BIGNUM for the y-coordinate
   *  \param  ctx    BN_CTX object (optional)
   *  \return 1 on success and 0 if an error occurred
   */
  int EC_POINT_get_affine_coordinates(const EC_GROUP *group, const EC_POINT *p,
                                      BIGNUM *x, BIGNUM *y, BN_CTX *ctx);
  
  #  ifndef OPENSSL_NO_DEPRECATED_3_0
  /** Sets the affine coordinates of an EC_POINT. A synonym of
   *  EC_POINT_set_affine_coordinates
   *  \param  group  underlying EC_GROUP object
   *  \param  p      EC_POINT object
   *  \param  x      BIGNUM with the x-coordinate
   *  \param  y      BIGNUM with the y-coordinate
   *  \param  ctx    BN_CTX object (optional)
   *  \return 1 on success and 0 if an error occurred
   */
  OSSL_DEPRECATEDIN_3_0 int EC_POINT_set_affine_coordinates_GFp
                        (const EC_GROUP *group, EC_POINT *p,
                         const BIGNUM *x, const BIGNUM *y, BN_CTX *ctx);
  
  /** Gets the affine coordinates of an EC_POINT. A synonym of
   *  EC_POINT_get_affine_coordinates
   *  \param  group  underlying EC_GROUP object
   *  \param  p      EC_POINT object
   *  \param  x      BIGNUM for the x-coordinate
   *  \param  y      BIGNUM for the y-coordinate
   *  \param  ctx    BN_CTX object (optional)
   *  \return 1 on success and 0 if an error occurred
   */
  OSSL_DEPRECATEDIN_3_0 int EC_POINT_get_affine_coordinates_GFp
                        (const EC_GROUP *group, const EC_POINT *p,
                         BIGNUM *x, BIGNUM *y, BN_CTX *ctx);
  #  endif /* OPENSSL_NO_DEPRECATED_3_0 */
  
  /** Sets the x9.62 compressed coordinates of a EC_POINT
   *  \param  group  underlying EC_GROUP object
   *  \param  p      EC_POINT object
   *  \param  x      BIGNUM with x-coordinate
   *  \param  y_bit  integer with the y-Bit (either 0 or 1)
   *  \param  ctx    BN_CTX object (optional)
   *  \return 1 on success and 0 if an error occurred
   */
  int EC_POINT_set_compressed_coordinates(const EC_GROUP *group, EC_POINT *p,
                                          const BIGNUM *x, int y_bit,
                                          BN_CTX *ctx);
  
  #  ifndef OPENSSL_NO_DEPRECATED_3_0
  /** Sets the x9.62 compressed coordinates of a EC_POINT. A synonym of
   *  EC_POINT_set_compressed_coordinates
   *  \param  group  underlying EC_GROUP object
   *  \param  p      EC_POINT object
   *  \param  x      BIGNUM with x-coordinate
   *  \param  y_bit  integer with the y-Bit (either 0 or 1)
   *  \param  ctx    BN_CTX object (optional)
   *  \return 1 on success and 0 if an error occurred
   */
  OSSL_DEPRECATEDIN_3_0 int EC_POINT_set_compressed_coordinates_GFp
                        (const EC_GROUP *group, EC_POINT *p,
                         const BIGNUM *x, int y_bit, BN_CTX *ctx);
  #   ifndef OPENSSL_NO_EC2M
  /** Sets the affine coordinates of an EC_POINT. A synonym of
   *  EC_POINT_set_affine_coordinates
   *  \param  group  underlying EC_GROUP object
   *  \param  p      EC_POINT object
   *  \param  x      BIGNUM with the x-coordinate
   *  \param  y      BIGNUM with the y-coordinate
   *  \param  ctx    BN_CTX object (optional)
   *  \return 1 on success and 0 if an error occurred
   */
  OSSL_DEPRECATEDIN_3_0 int EC_POINT_set_affine_coordinates_GF2m
                        (const EC_GROUP *group, EC_POINT *p,
                         const BIGNUM *x, const BIGNUM *y, BN_CTX *ctx);
  
  /** Gets the affine coordinates of an EC_POINT. A synonym of
   *  EC_POINT_get_affine_coordinates
   *  \param  group  underlying EC_GROUP object
   *  \param  p      EC_POINT object
   *  \param  x      BIGNUM for the x-coordinate
   *  \param  y      BIGNUM for the y-coordinate
   *  \param  ctx    BN_CTX object (optional)
   *  \return 1 on success and 0 if an error occurred
   */
  OSSL_DEPRECATEDIN_3_0 int EC_POINT_get_affine_coordinates_GF2m
                        (const EC_GROUP *group, const EC_POINT *p,
                         BIGNUM *x, BIGNUM *y, BN_CTX *ctx);
  
  /** Sets the x9.62 compressed coordinates of a EC_POINT. A synonym of
   *  EC_POINT_set_compressed_coordinates
   *  \param  group  underlying EC_GROUP object
   *  \param  p      EC_POINT object
   *  \param  x      BIGNUM with x-coordinate
   *  \param  y_bit  integer with the y-Bit (either 0 or 1)
   *  \param  ctx    BN_CTX object (optional)
   *  \return 1 on success and 0 if an error occurred
   */
  OSSL_DEPRECATEDIN_3_0 int EC_POINT_set_compressed_coordinates_GF2m
                        (const EC_GROUP *group, EC_POINT *p,
                         const BIGNUM *x, int y_bit, BN_CTX *ctx);
  #   endif
  #  endif /* OPENSSL_NO_DEPRECATED_3_0 */
  
  /** Encodes a EC_POINT object to a octet string
   *  \param  group  underlying EC_GROUP object
   *  \param  p      EC_POINT object
   *  \param  form   point conversion form
   *  \param  buf    memory buffer for the result. If NULL the function returns
   *                 required buffer size.
   *  \param  len    length of the memory buffer
   *  \param  ctx    BN_CTX object (optional)
   *  \return the length of the encoded octet string or 0 if an error occurred
   */
  size_t EC_POINT_point2oct(const EC_GROUP *group, const EC_POINT *p,
                            point_conversion_form_t form,
                            unsigned char *buf, size_t len, BN_CTX *ctx);
  
  /** Decodes a EC_POINT from a octet string
   *  \param  group  underlying EC_GROUP object
   *  \param  p      EC_POINT object
   *  \param  buf    memory buffer with the encoded ec point
   *  \param  len    length of the encoded ec point
   *  \param  ctx    BN_CTX object (optional)
   *  \return 1 on success and 0 if an error occurred
   */
  int EC_POINT_oct2point(const EC_GROUP *group, EC_POINT *p,
                         const unsigned char *buf, size_t len, BN_CTX *ctx);
  
  /** Encodes an EC_POINT object to an allocated octet string
   *  \param  group  underlying EC_GROUP object
   *  \param  point  EC_POINT object
   *  \param  form   point conversion form
   *  \param  pbuf   returns pointer to allocated buffer
   *  \param  ctx    BN_CTX object (optional)
   *  \return the length of the encoded octet string or 0 if an error occurred
   */
  size_t EC_POINT_point2buf(const EC_GROUP *group, const EC_POINT *point,
                            point_conversion_form_t form,
                            unsigned char **pbuf, BN_CTX *ctx);
  
  /* other interfaces to point2oct/oct2point: */
  #  ifndef OPENSSL_NO_DEPRECATED_3_0
  OSSL_DEPRECATEDIN_3_0 BIGNUM *EC_POINT_point2bn(const EC_GROUP *,
                                                  const EC_POINT *,
                                                  point_conversion_form_t form,
                                                  BIGNUM *, BN_CTX *);
  OSSL_DEPRECATEDIN_3_0 EC_POINT *EC_POINT_bn2point(const EC_GROUP *,
                                                    const BIGNUM *,
                                                    EC_POINT *, BN_CTX *);
  #  endif /* OPENSSL_NO_DEPRECATED_3_0 */
  
  char *EC_POINT_point2hex(const EC_GROUP *, const EC_POINT *,
                           point_conversion_form_t form, BN_CTX *);
  EC_POINT *EC_POINT_hex2point(const EC_GROUP *, const char *,
                               EC_POINT *, BN_CTX *);
  
  /********************************************************************/
  /*         functions for doing EC_POINT arithmetic                  */
  /********************************************************************/
  
  /** Computes the sum of two EC_POINT
   *  \param  group  underlying EC_GROUP object
   *  \param  r      EC_POINT object for the result (r = a + b)
   *  \param  a      EC_POINT object with the first summand
   *  \param  b      EC_POINT object with the second summand
   *  \param  ctx    BN_CTX object (optional)
   *  \return 1 on success and 0 if an error occurred
   */
  int EC_POINT_add(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a,
                   const EC_POINT *b, BN_CTX *ctx);
  
  /** Computes the double of a EC_POINT
   *  \param  group  underlying EC_GROUP object
   *  \param  r      EC_POINT object for the result (r = 2 * a)
   *  \param  a      EC_POINT object
   *  \param  ctx    BN_CTX object (optional)
   *  \return 1 on success and 0 if an error occurred
   */
  int EC_POINT_dbl(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a,
                   BN_CTX *ctx);
  
  /** Computes the inverse of a EC_POINT
   *  \param  group  underlying EC_GROUP object
   *  \param  a      EC_POINT object to be inverted (it's used for the result as well)
   *  \param  ctx    BN_CTX object (optional)
   *  \return 1 on success and 0 if an error occurred
   */
  int EC_POINT_invert(const EC_GROUP *group, EC_POINT *a, BN_CTX *ctx);
  
  /** Checks whether the point is the neutral element of the group
   *  \param  group  the underlying EC_GROUP object
   *  \param  p      EC_POINT object
   *  \return 1 if the point is the neutral element and 0 otherwise
   */
  int EC_POINT_is_at_infinity(const EC_GROUP *group, const EC_POINT *p);
  
  /** Checks whether the point is on the curve
   *  \param  group  underlying EC_GROUP object
   *  \param  point  EC_POINT object to check
   *  \param  ctx    BN_CTX object (optional)
   *  \return 1 if the point is on the curve, 0 if not, or -1 on error
   */
  int EC_POINT_is_on_curve(const EC_GROUP *group, const EC_POINT *point,
                           BN_CTX *ctx);
  
  /** Compares two EC_POINTs
   *  \param  group  underlying EC_GROUP object
   *  \param  a      first EC_POINT object
   *  \param  b      second EC_POINT object
   *  \param  ctx    BN_CTX object (optional)
   *  \return 1 if the points are not equal, 0 if they are, or -1 on error
   */
  int EC_POINT_cmp(const EC_GROUP *group, const EC_POINT *a, const EC_POINT *b,
                   BN_CTX *ctx);
  
  #  ifndef OPENSSL_NO_DEPRECATED_3_0
  OSSL_DEPRECATEDIN_3_0 int EC_POINT_make_affine(const EC_GROUP *group,
                                                 EC_POINT *point, BN_CTX *ctx);
  OSSL_DEPRECATEDIN_3_0 int EC_POINTs_make_affine(const EC_GROUP *group, size_t num,
                                                  EC_POINT *points[], BN_CTX *ctx);
  
  /** Computes r = generator * n + sum_{i=0}^{num-1} p[i] * m[i]
   *  \param  group  underlying EC_GROUP object
   *  \param  r      EC_POINT object for the result
   *  \param  n      BIGNUM with the multiplier for the group generator (optional)
   *  \param  num    number further summands
   *  \param  p      array of size num of EC_POINT objects
   *  \param  m      array of size num of BIGNUM objects
   *  \param  ctx    BN_CTX object (optional)
   *  \return 1 on success and 0 if an error occurred
   */
  OSSL_DEPRECATEDIN_3_0 int EC_POINTs_mul(const EC_GROUP *group, EC_POINT *r,
                                          const BIGNUM *n, size_t num,
                                          const EC_POINT *p[], const BIGNUM *m[],
                                          BN_CTX *ctx);
  #  endif /* OPENSSL_NO_DEPRECATED_3_0 */
  
  /** Computes r = generator * n + q * m
   *  \param  group  underlying EC_GROUP object
   *  \param  r      EC_POINT object for the result
   *  \param  n      BIGNUM with the multiplier for the group generator (optional)
   *  \param  q      EC_POINT object with the first factor of the second summand
   *  \param  m      BIGNUM with the second factor of the second summand
   *  \param  ctx    BN_CTX object (optional)
   *  \return 1 on success and 0 if an error occurred
   */
  int EC_POINT_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *n,
                   const EC_POINT *q, const BIGNUM *m, BN_CTX *ctx);
  
  #  ifndef OPENSSL_NO_DEPRECATED_3_0
  /** Stores multiples of generator for faster point multiplication
   *  \param  group  EC_GROUP object
   *  \param  ctx    BN_CTX object (optional)
   *  \return 1 on success and 0 if an error occurred
   */
  OSSL_DEPRECATEDIN_3_0 int EC_GROUP_precompute_mult(EC_GROUP *group, BN_CTX *ctx);
  
  /** Reports whether a precomputation has been done
   *  \param  group  EC_GROUP object
   *  \return 1 if a pre-computation has been done and 0 otherwise
   */
  OSSL_DEPRECATEDIN_3_0 int EC_GROUP_have_precompute_mult(const EC_GROUP *group);
  #  endif /* OPENSSL_NO_DEPRECATED_3_0 */
  
  /********************************************************************/
  /*                       ASN1 stuff                                 */
  /********************************************************************/
  
  DECLARE_ASN1_ITEM(ECPKPARAMETERS)
  DECLARE_ASN1_ALLOC_FUNCTIONS(ECPKPARAMETERS)
  DECLARE_ASN1_ITEM(ECPARAMETERS)
  DECLARE_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
  
  /*
   * EC_GROUP_get_basis_type() returns the NID of the basis type used to
   * represent the field elements
   */
  int EC_GROUP_get_basis_type(const EC_GROUP *);
  #  ifndef OPENSSL_NO_EC2M
  int EC_GROUP_get_trinomial_basis(const EC_GROUP *, unsigned int *k);
  int EC_GROUP_get_pentanomial_basis(const EC_GROUP *, unsigned int *k1,
                                     unsigned int *k2, unsigned int *k3);
  #  endif
  
  EC_GROUP *d2i_ECPKParameters(EC_GROUP **, const unsigned char **in, long len);
  int i2d_ECPKParameters(const EC_GROUP *, unsigned char **out);
  
  #  define d2i_ECPKParameters_bio(bp,x) \
      ASN1_d2i_bio_of(EC_GROUP, NULL, d2i_ECPKParameters, bp, x)
  #  define i2d_ECPKParameters_bio(bp,x) \
      ASN1_i2d_bio_of(EC_GROUP, i2d_ECPKParameters, bp, x)
  #  define d2i_ECPKParameters_fp(fp,x) \
      (EC_GROUP *)ASN1_d2i_fp(NULL, (d2i_of_void *)d2i_ECPKParameters, (fp), \
                              (void **)(x))
  #  define i2d_ECPKParameters_fp(fp,x) \
      ASN1_i2d_fp((i2d_of_void *)i2d_ECPKParameters, (fp), (void *)(x))
  
  #  ifndef OPENSSL_NO_DEPRECATED_3_0
  OSSL_DEPRECATEDIN_3_0 int ECPKParameters_print(BIO *bp, const EC_GROUP *x,
                                                 int off);
  #   ifndef OPENSSL_NO_STDIO
  OSSL_DEPRECATEDIN_3_0 int ECPKParameters_print_fp(FILE *fp, const EC_GROUP *x,
                                                    int off);
  #   endif
  #  endif /* OPENSSL_NO_DEPRECATED_3_0 */
  
  /********************************************************************/
  /*                      EC_KEY functions                            */
  /********************************************************************/
  
  /* some values for the encoding_flag */
  #  define EC_PKEY_NO_PARAMETERS   0x001
  #  define EC_PKEY_NO_PUBKEY       0x002
  
  /* some values for the flags field */
  #  define EC_FLAG_SM2_RANGE              0x0004
  #  define EC_FLAG_COFACTOR_ECDH          0x1000
  #  define EC_FLAG_CHECK_NAMED_GROUP      0x2000
  #  define EC_FLAG_CHECK_NAMED_GROUP_NIST 0x4000
  #  define EC_FLAG_CHECK_NAMED_GROUP_MASK \
      (EC_FLAG_CHECK_NAMED_GROUP | EC_FLAG_CHECK_NAMED_GROUP_NIST)
  
  /* Deprecated flags -  it was using 0x01..0x02 */
  #  define EC_FLAG_NON_FIPS_ALLOW         0x0000
  #  define EC_FLAG_FIPS_CHECKED           0x0000
  
  #  ifndef OPENSSL_NO_DEPRECATED_3_0
  /**
   *  Creates a new EC_KEY object.
   *  \param  ctx  The library context for to use for this EC_KEY. May be NULL in
   *               which case the default library context is used.
   *  \return EC_KEY object or NULL if an error occurred.
   */
  OSSL_DEPRECATEDIN_3_0 EC_KEY *EC_KEY_new_ex(OSSL_LIB_CTX *ctx, const char *propq);
  
  /**
   *  Creates a new EC_KEY object. Same as calling EC_KEY_new_ex with a
   *  NULL library context
   *  \return EC_KEY object or NULL if an error occurred.
   */
  OSSL_DEPRECATEDIN_3_0 EC_KEY *EC_KEY_new(void);
  
  OSSL_DEPRECATEDIN_3_0 int EC_KEY_get_flags(const EC_KEY *key);
  
  OSSL_DEPRECATEDIN_3_0 void EC_KEY_set_flags(EC_KEY *key, int flags);
  
  OSSL_DEPRECATEDIN_3_0 void EC_KEY_clear_flags(EC_KEY *key, int flags);
  
  OSSL_DEPRECATEDIN_3_0 int EC_KEY_decoded_from_explicit_params(const EC_KEY *key);
  
  /**
   *  Creates a new EC_KEY object using a named curve as underlying
   *  EC_GROUP object.
   *  \param  ctx   The library context for to use for this EC_KEY. May be NULL in
   *                which case the default library context is used.
   *  \param  propq Any property query string
   *  \param  nid   NID of the named curve.
   *  \return EC_KEY object or NULL if an error occurred.
   */
  OSSL_DEPRECATEDIN_3_0 EC_KEY *EC_KEY_new_by_curve_name_ex(OSSL_LIB_CTX *ctx,
                                                            const char *propq,
                                                            int nid);
  
  /**
   *  Creates a new EC_KEY object using a named curve as underlying
   *  EC_GROUP object. Same as calling EC_KEY_new_by_curve_name_ex with a NULL
   *  library context and property query string.
   *  \param  nid  NID of the named curve.
   *  \return EC_KEY object or NULL if an error occurred.
   */
  OSSL_DEPRECATEDIN_3_0 EC_KEY *EC_KEY_new_by_curve_name(int nid);
  
  /** Frees a EC_KEY object.
   *  \param  key  EC_KEY object to be freed.
   */
  OSSL_DEPRECATEDIN_3_0 void EC_KEY_free(EC_KEY *key);
  
  /** Copies a EC_KEY object.
   *  \param  dst  destination EC_KEY object
   *  \param  src  src EC_KEY object
   *  \return dst or NULL if an error occurred.
   */
  OSSL_DEPRECATEDIN_3_0 EC_KEY *EC_KEY_copy(EC_KEY *dst, const EC_KEY *src);
  
  /** Creates a new EC_KEY object and copies the content from src to it.
   *  \param  src  the source EC_KEY object
   *  \return newly created EC_KEY object or NULL if an error occurred.
   */
  OSSL_DEPRECATEDIN_3_0 EC_KEY *EC_KEY_dup(const EC_KEY *src);
  
  /** Increases the internal reference count of a EC_KEY object.
   *  \param  key  EC_KEY object
   *  \return 1 on success and 0 if an error occurred.
   */
  OSSL_DEPRECATEDIN_3_0 int EC_KEY_up_ref(EC_KEY *key);
  
  /** Returns the ENGINE object of a EC_KEY object
   *  \param  eckey  EC_KEY object
   *  \return the ENGINE object (possibly NULL).
   */
  OSSL_DEPRECATEDIN_3_0 ENGINE *EC_KEY_get0_engine(const EC_KEY *eckey);
  
  /** Returns the EC_GROUP object of a EC_KEY object
   *  \param  key  EC_KEY object
   *  \return the EC_GROUP object (possibly NULL).
   */
  OSSL_DEPRECATEDIN_3_0 const EC_GROUP *EC_KEY_get0_group(const EC_KEY *key);
  
  /** Sets the EC_GROUP of a EC_KEY object.
   *  \param  key    EC_KEY object
   *  \param  group  EC_GROUP to use in the EC_KEY object (note: the EC_KEY
   *                 object will use an own copy of the EC_GROUP).
   *  \return 1 on success and 0 if an error occurred.
   */
  OSSL_DEPRECATEDIN_3_0 int EC_KEY_set_group(EC_KEY *key, const EC_GROUP *group);
  
  /** Returns the private key of a EC_KEY object.
   *  \param  key  EC_KEY object
   *  \return a BIGNUM with the private key (possibly NULL).
   */
  OSSL_DEPRECATEDIN_3_0 const BIGNUM *EC_KEY_get0_private_key(const EC_KEY *key);
  
  /** Sets the private key of a EC_KEY object.
   *  \param  key  EC_KEY object
   *  \param  prv  BIGNUM with the private key (note: the EC_KEY object
   *               will use an own copy of the BIGNUM).
   *  \return 1 on success and 0 if an error occurred.
   */
  OSSL_DEPRECATEDIN_3_0 int EC_KEY_set_private_key(EC_KEY *key, const BIGNUM *prv);
  
  /** Returns the public key of a EC_KEY object.
   *  \param  key  the EC_KEY object
   *  \return a EC_POINT object with the public key (possibly NULL)
   */
  OSSL_DEPRECATEDIN_3_0 const EC_POINT *EC_KEY_get0_public_key(const EC_KEY *key);
  
  /** Sets the public key of a EC_KEY object.
   *  \param  key  EC_KEY object
   *  \param  pub  EC_POINT object with the public key (note: the EC_KEY object
   *               will use an own copy of the EC_POINT object).
   *  \return 1 on success and 0 if an error occurred.
   */
  OSSL_DEPRECATEDIN_3_0 int EC_KEY_set_public_key(EC_KEY *key, const EC_POINT *pub);
  
  OSSL_DEPRECATEDIN_3_0 unsigned EC_KEY_get_enc_flags(const EC_KEY *key);
  OSSL_DEPRECATEDIN_3_0 void EC_KEY_set_enc_flags(EC_KEY *eckey, unsigned int flags);
  OSSL_DEPRECATEDIN_3_0 point_conversion_form_t EC_KEY_get_conv_form(const EC_KEY *key);
  OSSL_DEPRECATEDIN_3_0 void EC_KEY_set_conv_form(EC_KEY *eckey,
                                                  point_conversion_form_t cform);
  #  endif /*OPENSSL_NO_DEPRECATED_3_0 */
  
  #  define EC_KEY_get_ex_new_index(l, p, newf, dupf, freef) \
      CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_EC_KEY, l, p, newf, dupf, freef)
  
  #  ifndef OPENSSL_NO_DEPRECATED_3_0
  OSSL_DEPRECATEDIN_3_0 int EC_KEY_set_ex_data(EC_KEY *key, int idx, void *arg);
  OSSL_DEPRECATEDIN_3_0 void *EC_KEY_get_ex_data(const EC_KEY *key, int idx);
  
  /* wrapper functions for the underlying EC_GROUP object */
  OSSL_DEPRECATEDIN_3_0 void EC_KEY_set_asn1_flag(EC_KEY *eckey, int asn1_flag);
  
  /** Creates a table of pre-computed multiples of the generator to
   *  accelerate further EC_KEY operations.
   *  \param  key  EC_KEY object
   *  \param  ctx  BN_CTX object (optional)
   *  \return 1 on success and 0 if an error occurred.
   */
  OSSL_DEPRECATEDIN_3_0 int EC_KEY_precompute_mult(EC_KEY *key, BN_CTX *ctx);
  
  /** Creates a new ec private (and optional a new public) key.
   *  \param  key  EC_KEY object
   *  \return 1 on success and 0 if an error occurred.
   */
  OSSL_DEPRECATEDIN_3_0 int EC_KEY_generate_key(EC_KEY *key);
  
  /** Verifies that a private and/or public key is valid.
   *  \param  key  the EC_KEY object
   *  \return 1 on success and 0 otherwise.
   */
  OSSL_DEPRECATEDIN_3_0 int EC_KEY_check_key(const EC_KEY *key);
  
  /** Indicates if an EC_KEY can be used for signing.
   *  \param  eckey  the EC_KEY object
   *  \return 1 if can can sign and 0 otherwise.
   */
  OSSL_DEPRECATEDIN_3_0 int EC_KEY_can_sign(const EC_KEY *eckey);
  
  /** Sets a public key from affine coordinates performing
   *  necessary NIST PKV tests.
   *  \param  key  the EC_KEY object
   *  \param  x    public key x coordinate
   *  \param  y    public key y coordinate
   *  \return 1 on success and 0 otherwise.
   */
  OSSL_DEPRECATEDIN_3_0 int EC_KEY_set_public_key_affine_coordinates(EC_KEY *key,
                                                                     BIGNUM *x,
                                                                     BIGNUM *y);
  
  /** Encodes an EC_KEY public key to an allocated octet string
   *  \param  key    key to encode
   *  \param  form   point conversion form
   *  \param  pbuf   returns pointer to allocated buffer
   *  \param  ctx    BN_CTX object (optional)
   *  \return the length of the encoded octet string or 0 if an error occurred
   */
  OSSL_DEPRECATEDIN_3_0 size_t EC_KEY_key2buf(const EC_KEY *key,
                                              point_conversion_form_t form,
                                              unsigned char **pbuf, BN_CTX *ctx);
  
  /** Decodes a EC_KEY public key from a octet string
   *  \param  key    key to decode
   *  \param  buf    memory buffer with the encoded ec point
   *  \param  len    length of the encoded ec point
   *  \param  ctx    BN_CTX object (optional)
   *  \return 1 on success and 0 if an error occurred
   */
  
  OSSL_DEPRECATEDIN_3_0 int EC_KEY_oct2key(EC_KEY *key, const unsigned char *buf,
                                           size_t len, BN_CTX *ctx);
  
  /** Decodes an EC_KEY private key from an octet string
   *  \param  key    key to decode
   *  \param  buf    memory buffer with the encoded private key
   *  \param  len    length of the encoded key
   *  \return 1 on success and 0 if an error occurred
   */
  
  OSSL_DEPRECATEDIN_3_0 int EC_KEY_oct2priv(EC_KEY *key, const unsigned char *buf,
                                            size_t len);
  
  /** Encodes a EC_KEY private key to an octet string
   *  \param  key    key to encode
   *  \param  buf    memory buffer for the result. If NULL the function returns
   *                 required buffer size.
   *  \param  len    length of the memory buffer
   *  \return the length of the encoded octet string or 0 if an error occurred
   */
  
  OSSL_DEPRECATEDIN_3_0 size_t EC_KEY_priv2oct(const EC_KEY *key,
                                               unsigned char *buf, size_t len);
  
  /** Encodes an EC_KEY private key to an allocated octet string
   *  \param  eckey  key to encode
   *  \param  pbuf   returns pointer to allocated buffer
   *  \return the length of the encoded octet string or 0 if an error occurred
   */
  OSSL_DEPRECATEDIN_3_0 size_t EC_KEY_priv2buf(const EC_KEY *eckey,
                                               unsigned char **pbuf);
  
  /********************************************************************/
  /*        de- and encoding functions for SEC1 ECPrivateKey          */
  /********************************************************************/
  
  /** Decodes a private key from a memory buffer.
   *  \param  key  a pointer to a EC_KEY object which should be used (or NULL)
   *  \param  in   pointer to memory with the DER encoded private key
   *  \param  len  length of the DER encoded private key
   *  \return the decoded private key or NULL if an error occurred.
   */
  OSSL_DEPRECATEDIN_3_0 EC_KEY *d2i_ECPrivateKey(EC_KEY **key,
                                                 const unsigned char **in,
                                                 long len);
  
  /** Encodes a private key object and stores the result in a buffer.
   *  \param  key  the EC_KEY object to encode
   *  \param  out  the buffer for the result (if NULL the function returns number
   *               of bytes needed).
   *  \return 1 on success and 0 if an error occurred.
   */
  OSSL_DEPRECATEDIN_3_0 int i2d_ECPrivateKey(const EC_KEY *key,
                                             unsigned char **out);
  
  /********************************************************************/
  /*        de- and encoding functions for EC parameters              */
  /********************************************************************/
  
  /** Decodes ec parameter from a memory buffer.
   *  \param  key  a pointer to a EC_KEY object which should be used (or NULL)
   *  \param  in   pointer to memory with the DER encoded ec parameters
   *  \param  len  length of the DER encoded ec parameters
   *  \return a EC_KEY object with the decoded parameters or NULL if an error
   *          occurred.
   */
  OSSL_DEPRECATEDIN_3_0 EC_KEY *d2i_ECParameters(EC_KEY **key,
                                                 const unsigned char **in,
                                                 long len);
  
  /** Encodes ec parameter and stores the result in a buffer.
   *  \param  key  the EC_KEY object with ec parameters to encode
   *  \param  out  the buffer for the result (if NULL the function returns number
   *               of bytes needed).
   *  \return 1 on success and 0 if an error occurred.
   */
  OSSL_DEPRECATEDIN_3_0 int i2d_ECParameters(const EC_KEY *key,
                                             unsigned char **out);
  
  /********************************************************************/
  /*         de- and encoding functions for EC public key             */
  /*         (octet string, not DER -- hence 'o2i' and 'i2o')         */
  /********************************************************************/
  
  /** Decodes an ec public key from a octet string.
   *  \param  key  a pointer to a EC_KEY object which should be used
   *  \param  in   memory buffer with the encoded public key
   *  \param  len  length of the encoded public key
   *  \return EC_KEY object with decoded public key or NULL if an error
   *          occurred.
   */
  OSSL_DEPRECATEDIN_3_0 EC_KEY *o2i_ECPublicKey(EC_KEY **key,
                                                const unsigned char **in, long len);
  
  /** Encodes an ec public key in an octet string.
   *  \param  key  the EC_KEY object with the public key
   *  \param  out  the buffer for the result (if NULL the function returns number
   *               of bytes needed).
   *  \return 1 on success and 0 if an error occurred
   */
  OSSL_DEPRECATEDIN_3_0 int i2o_ECPublicKey(const EC_KEY *key, unsigned char **out);
  
  /** Prints out the ec parameters on human readable form.
   *  \param  bp   BIO object to which the information is printed
   *  \param  key  EC_KEY object
   *  \return 1 on success and 0 if an error occurred
   */
  OSSL_DEPRECATEDIN_3_0 int ECParameters_print(BIO *bp, const EC_KEY *key);
  
  /** Prints out the contents of a EC_KEY object
   *  \param  bp   BIO object to which the information is printed
   *  \param  key  EC_KEY object
   *  \param  off  line offset
   *  \return 1 on success and 0 if an error occurred
   */
  OSSL_DEPRECATEDIN_3_0 int EC_KEY_print(BIO *bp, const EC_KEY *key, int off);
  
  #   ifndef OPENSSL_NO_STDIO
  /** Prints out the ec parameters on human readable form.
   *  \param  fp   file descriptor to which the information is printed
   *  \param  key  EC_KEY object
   *  \return 1 on success and 0 if an error occurred
   */
  OSSL_DEPRECATEDIN_3_0 int ECParameters_print_fp(FILE *fp, const EC_KEY *key);
  
  /** Prints out the contents of a EC_KEY object
   *  \param  fp   file descriptor to which the information is printed
   *  \param  key  EC_KEY object
   *  \param  off  line offset
   *  \return 1 on success and 0 if an error occurred
   */
  OSSL_DEPRECATEDIN_3_0 int EC_KEY_print_fp(FILE *fp, const EC_KEY *key, int off);
  #   endif /* OPENSSL_NO_STDIO */
  
  OSSL_DEPRECATEDIN_3_0 const EC_KEY_METHOD *EC_KEY_OpenSSL(void);
  OSSL_DEPRECATEDIN_3_0 const EC_KEY_METHOD *EC_KEY_get_default_method(void);
  OSSL_DEPRECATEDIN_3_0 void EC_KEY_set_default_method(const EC_KEY_METHOD *meth);
  OSSL_DEPRECATEDIN_3_0 const EC_KEY_METHOD *EC_KEY_get_method(const EC_KEY *key);
  OSSL_DEPRECATEDIN_3_0 int EC_KEY_set_method(EC_KEY *key, const EC_KEY_METHOD *meth);
  OSSL_DEPRECATEDIN_3_0 EC_KEY *EC_KEY_new_method(ENGINE *engine);
  
  /** The old name for ecdh_KDF_X9_63
   *  The ECDH KDF specification has been mistakingly attributed to ANSI X9.62,
   *  it is actually specified in ANSI X9.63.
   *  This identifier is retained for backwards compatibility
   */
  OSSL_DEPRECATEDIN_3_0 int ECDH_KDF_X9_62(unsigned char *out, size_t outlen,
                                           const unsigned char *Z, size_t Zlen,
                                           const unsigned char *sinfo,
                                           size_t sinfolen, const EVP_MD *md);
  
  OSSL_DEPRECATEDIN_3_0 int ECDH_compute_key(void *out, size_t outlen,
                                             const EC_POINT *pub_key,
                                             const EC_KEY *ecdh,
                                             void *(*KDF)(const void *in,
                                                          size_t inlen, void *out,
                                                          size_t *outlen));
  #  endif /* OPENSSL_NO_DEPRECATED_3_0 */
  
  typedef struct ECDSA_SIG_st ECDSA_SIG;
  
  /** Allocates and initialize a ECDSA_SIG structure
   *  \return pointer to a ECDSA_SIG structure or NULL if an error occurred
   */
  ECDSA_SIG *ECDSA_SIG_new(void);
  
  /** frees a ECDSA_SIG structure
   *  \param  sig  pointer to the ECDSA_SIG structure
   */
  void ECDSA_SIG_free(ECDSA_SIG *sig);
  
  /** i2d_ECDSA_SIG encodes content of ECDSA_SIG (note: this function modifies *pp
   *  (*pp += length of the DER encoded signature)).
   *  \param  sig  pointer to the ECDSA_SIG object
   *  \param  pp   pointer to a unsigned char pointer for the output or NULL
   *  \return the length of the DER encoded ECDSA_SIG object or a negative value
   *          on error
   */
  DECLARE_ASN1_ENCODE_FUNCTIONS_only(ECDSA_SIG, ECDSA_SIG)
  
  /** d2i_ECDSA_SIG decodes an ECDSA signature (note: this function modifies *pp
   *  (*pp += len)).
   *  \param  sig  pointer to ECDSA_SIG pointer (may be NULL)
   *  \param  pp   memory buffer with the DER encoded signature
   *  \param  len  length of the buffer
   *  \return pointer to the decoded ECDSA_SIG structure (or NULL)
   */
  
  /** Accessor for r and s fields of ECDSA_SIG
   *  \param  sig  pointer to ECDSA_SIG structure
   *  \param  pr   pointer to BIGNUM pointer for r (may be NULL)
   *  \param  ps   pointer to BIGNUM pointer for s (may be NULL)
   */
  void ECDSA_SIG_get0(const ECDSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps);
  
  /** Accessor for r field of ECDSA_SIG
   *  \param  sig  pointer to ECDSA_SIG structure
   */
  const BIGNUM *ECDSA_SIG_get0_r(const ECDSA_SIG *sig);
  
  /** Accessor for s field of ECDSA_SIG
   *  \param  sig  pointer to ECDSA_SIG structure
   */
  const BIGNUM *ECDSA_SIG_get0_s(const ECDSA_SIG *sig);
  
  /** Setter for r and s fields of ECDSA_SIG
   *  \param  sig  pointer to ECDSA_SIG structure
   *  \param  r    pointer to BIGNUM for r
   *  \param  s    pointer to BIGNUM for s
   */
  int ECDSA_SIG_set0(ECDSA_SIG *sig, BIGNUM *r, BIGNUM *s);
  
  #  ifndef OPENSSL_NO_DEPRECATED_3_0
  /** Computes the ECDSA signature of the given hash value using
   *  the supplied private key and returns the created signature.
   *  \param  dgst      pointer to the hash value
   *  \param  dgst_len  length of the hash value
   *  \param  eckey     EC_KEY object containing a private EC key
   *  \return pointer to a ECDSA_SIG structure or NULL if an error occurred
   */
  OSSL_DEPRECATEDIN_3_0 ECDSA_SIG *ECDSA_do_sign(const unsigned char *dgst,
                                                 int dgst_len, EC_KEY *eckey);
  
  /** Computes ECDSA signature of a given hash value using the supplied
   *  private key (note: sig must point to ECDSA_size(eckey) bytes of memory).
   *  \param  dgst     pointer to the hash value to sign
   *  \param  dgstlen  length of the hash value
   *  \param  kinv     BIGNUM with a pre-computed inverse k (optional)
   *  \param  rp       BIGNUM with a pre-computed rp value (optional),
   *                   see ECDSA_sign_setup
   *  \param  eckey    EC_KEY object containing a private EC key
   *  \return pointer to a ECDSA_SIG structure or NULL if an error occurred
   */
  OSSL_DEPRECATEDIN_3_0 ECDSA_SIG *ECDSA_do_sign_ex(const unsigned char *dgst,
                                                    int dgstlen, const BIGNUM *kinv,
                                                    const BIGNUM *rp, EC_KEY *eckey);
  
  /** Verifies that the supplied signature is a valid ECDSA
   *  signature of the supplied hash value using the supplied public key.
   *  \param  dgst      pointer to the hash value
   *  \param  dgst_len  length of the hash value
   *  \param  sig       ECDSA_SIG structure
   *  \param  eckey     EC_KEY object containing a public EC key
   *  \return 1 if the signature is valid, 0 if the signature is invalid
   *          and -1 on error
   */
  OSSL_DEPRECATEDIN_3_0 int ECDSA_do_verify(const unsigned char *dgst, int dgst_len,
                                            const ECDSA_SIG *sig, EC_KEY *eckey);
  
  /** Precompute parts of the signing operation
   *  \param  eckey  EC_KEY object containing a private EC key
   *  \param  ctx    BN_CTX object (optional)
   *  \param  kinv   BIGNUM pointer for the inverse of k
   *  \param  rp     BIGNUM pointer for x coordinate of k * generator
   *  \return 1 on success and 0 otherwise
   */
  OSSL_DEPRECATEDIN_3_0 int ECDSA_sign_setup(EC_KEY *eckey, BN_CTX *ctx,
                                             BIGNUM **kinv, BIGNUM **rp);
  
  /** Computes ECDSA signature of a given hash value using the supplied
   *  private key (note: sig must point to ECDSA_size(eckey) bytes of memory).
   *  \param  type     this parameter is ignored
   *  \param  dgst     pointer to the hash value to sign
   *  \param  dgstlen  length of the hash value
   *  \param  sig      memory for the DER encoded created signature
   *  \param  siglen   pointer to the length of the returned signature
   *  \param  eckey    EC_KEY object containing a private EC key
   *  \return 1 on success and 0 otherwise
   */
  OSSL_DEPRECATEDIN_3_0 int ECDSA_sign(int type, const unsigned char *dgst,
                                       int dgstlen, unsigned char *sig,
                                       unsigned int *siglen, EC_KEY *eckey);
  
  /** Computes ECDSA signature of a given hash value using the supplied
   *  private key (note: sig must point to ECDSA_size(eckey) bytes of memory).
   *  \param  type     this parameter is ignored
   *  \param  dgst     pointer to the hash value to sign
   *  \param  dgstlen  length of the hash value
   *  \param  sig      buffer to hold the DER encoded signature
   *  \param  siglen   pointer to the length of the returned signature
   *  \param  kinv     BIGNUM with a pre-computed inverse k (optional)
   *  \param  rp       BIGNUM with a pre-computed rp value (optional),
   *                   see ECDSA_sign_setup
   *  \param  eckey    EC_KEY object containing a private EC key
   *  \return 1 on success and 0 otherwise
   */
  OSSL_DEPRECATEDIN_3_0 int ECDSA_sign_ex(int type, const unsigned char *dgst,
                                          int dgstlen, unsigned char *sig,
                                          unsigned int *siglen, const BIGNUM *kinv,
                                          const BIGNUM *rp, EC_KEY *eckey);
  
  /** Verifies that the given signature is valid ECDSA signature
   *  of the supplied hash value using the specified public key.
   *  \param  type     this parameter is ignored
   *  \param  dgst     pointer to the hash value
   *  \param  dgstlen  length of the hash value
   *  \param  sig      pointer to the DER encoded signature
   *  \param  siglen   length of the DER encoded signature
   *  \param  eckey    EC_KEY object containing a public EC key
   *  \return 1 if the signature is valid, 0 if the signature is invalid
   *          and -1 on error
   */
  OSSL_DEPRECATEDIN_3_0 int ECDSA_verify(int type, const unsigned char *dgst,
                                         int dgstlen, const unsigned char *sig,
                                         int siglen, EC_KEY *eckey);
  
  /** Returns the maximum length of the DER encoded signature
   *  \param  eckey  EC_KEY object
   *  \return numbers of bytes required for the DER encoded signature
   */
  OSSL_DEPRECATEDIN_3_0 int ECDSA_size(const EC_KEY *eckey);
  
  /********************************************************************/
  /*  EC_KEY_METHOD constructors, destructors, writers and accessors  */
  /********************************************************************/
  
  OSSL_DEPRECATEDIN_3_0 EC_KEY_METHOD *EC_KEY_METHOD_new(const EC_KEY_METHOD *meth);
  OSSL_DEPRECATEDIN_3_0 void EC_KEY_METHOD_free(EC_KEY_METHOD *meth);
  OSSL_DEPRECATEDIN_3_0 void EC_KEY_METHOD_set_init
                        (EC_KEY_METHOD *meth,
                         int (*init)(EC_KEY *key),
                         void (*finish)(EC_KEY *key),
                         int (*copy)(EC_KEY *dest, const EC_KEY *src),
                         int (*set_group)(EC_KEY *key, const EC_GROUP *grp),
                         int (*set_private)(EC_KEY *key, const BIGNUM *priv_key),
                         int (*set_public)(EC_KEY *key, const EC_POINT *pub_key));
  
  OSSL_DEPRECATEDIN_3_0 void EC_KEY_METHOD_set_keygen(EC_KEY_METHOD *meth,
                                                      int (*keygen)(EC_KEY *key));
  
  OSSL_DEPRECATEDIN_3_0 void EC_KEY_METHOD_set_compute_key
                        (EC_KEY_METHOD *meth,
                         int (*ckey)(unsigned char **psec, size_t *pseclen,
                                     const EC_POINT *pub_key, const EC_KEY *ecdh));
  
  OSSL_DEPRECATEDIN_3_0 void EC_KEY_METHOD_set_sign
                        (EC_KEY_METHOD *meth,
                         int (*sign)(int type, const unsigned char *dgst,
                                     int dlen, unsigned char *sig,
                                     unsigned int *siglen,
                                     const BIGNUM *kinv, const BIGNUM *r,
                                     EC_KEY *eckey),
                         int (*sign_setup)(EC_KEY *eckey, BN_CTX *ctx_in,
                                           BIGNUM **kinvp, BIGNUM **rp),
                         ECDSA_SIG *(*sign_sig)(const unsigned char *dgst,
                                                int dgst_len,
                                                const BIGNUM *in_kinv,
                                                const BIGNUM *in_r,
                                                EC_KEY *eckey));
  
  OSSL_DEPRECATEDIN_3_0 void EC_KEY_METHOD_set_verify
                        (EC_KEY_METHOD *meth,
                         int (*verify)(int type, const unsigned
                                       char *dgst, int dgst_len,
                                       const unsigned char *sigbuf,
                                       int sig_len, EC_KEY *eckey),
                         int (*verify_sig)(const unsigned char *dgst,
                                           int dgst_len, const ECDSA_SIG *sig,
                                           EC_KEY *eckey));
  
  OSSL_DEPRECATEDIN_3_0 void EC_KEY_METHOD_get_init
                        (const EC_KEY_METHOD *meth,
                         int (**pinit)(EC_KEY *key),
                         void (**pfinish)(EC_KEY *key),
                         int (**pcopy)(EC_KEY *dest, const EC_KEY *src),
                         int (**pset_group)(EC_KEY *key, const EC_GROUP *grp),
                         int (**pset_private)(EC_KEY *key, const BIGNUM *priv_key),
                         int (**pset_public)(EC_KEY *key, const EC_POINT *pub_key));
  
  OSSL_DEPRECATEDIN_3_0 void EC_KEY_METHOD_get_keygen
                        (const EC_KEY_METHOD *meth, int (**pkeygen)(EC_KEY *key));
  
  OSSL_DEPRECATEDIN_3_0 void EC_KEY_METHOD_get_compute_key
                        (const EC_KEY_METHOD *meth,
                         int (**pck)(unsigned char **psec,
                         size_t *pseclen,
                         const EC_POINT *pub_key,
                         const EC_KEY *ecdh));
  
  OSSL_DEPRECATEDIN_3_0 void EC_KEY_METHOD_get_sign
                        (const EC_KEY_METHOD *meth,
                         int (**psign)(int type, const unsigned char *dgst,
                                       int dlen, unsigned char *sig,
                                       unsigned int *siglen,
                                       const BIGNUM *kinv, const BIGNUM *r,
                                       EC_KEY *eckey),
                         int (**psign_setup)(EC_KEY *eckey, BN_CTX *ctx_in,
                                             BIGNUM **kinvp, BIGNUM **rp),
                         ECDSA_SIG *(**psign_sig)(const unsigned char *dgst,
                                                  int dgst_len,
                                                  const BIGNUM *in_kinv,
                                                  const BIGNUM *in_r,
                                                  EC_KEY *eckey));
  
  OSSL_DEPRECATEDIN_3_0 void EC_KEY_METHOD_get_verify
                        (const EC_KEY_METHOD *meth,
                         int (**pverify)(int type, const unsigned
                                         char *dgst, int dgst_len,
                                         const unsigned char *sigbuf,
                                         int sig_len, EC_KEY *eckey),
                         int (**pverify_sig)(const unsigned char *dgst,
                                             int dgst_len,
                                             const ECDSA_SIG *sig,
                                             EC_KEY *eckey));
  #  endif /* OPENSSL_NO_DEPRECATED_3_0 */
  
  #  define EVP_EC_gen(curve) \
      EVP_PKEY_Q_keygen(NULL, NULL, "EC", (char *)(strstr(curve, "")))
      /* strstr is used to enable type checking for the variadic string arg */
  #  define ECParameters_dup(x) ASN1_dup_of(EC_KEY, i2d_ECParameters, \
                                            d2i_ECParameters, x)
  
  #  ifndef __cplusplus
  #   if defined(__SUNPRO_C)
  #    if __SUNPRO_C >= 0x520
  #     pragma error_messages (default,E_ARRAY_OF_INCOMPLETE_NONAME,E_ARRAY_OF_INCOMPLETE)
  #    endif
  #   endif
  #  endif
  
  # endif
  # ifdef  __cplusplus
  }
  # endif
  #endif
  