THUAI6/CAPI/cpp/grpc/include/openssl/ec.h

/*
 * 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