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Edit File : ec.h \| Size : 62.19 KB
/* * Copyright 2002-2021 The OpenSSL Project Authors. All Rights Reserved. * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved * * Licensed under the OpenSSL license (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 HEADER_EC_H # define HEADER_EC_H # include <openssl/opensslconf.h> # ifndef OPENSSL_NO_EC # include <openssl/asn1.h> # include <openssl/symhacks.h> # if OPENSSL_API_COMPAT < 0x10100000L # include <openssl/bn.h> # endif # include <openssl/ecerr.h> # ifdef __cplusplus extern "C" { # endif # ifndef OPENSSL_ECC_MAX_FIELD_BITS # define OPENSSL_ECC_MAX_FIELD_BITS 661 # endif /* 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; typedef struct ec_method_st EC_METHOD; 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) / /*****************************************************************/ / Returns the basic GFp ec methods which provides the basis for the * optimized methods. * \return EC_METHOD object / const EC_METHOD EC_GFp_simple_method(void); /** Returns GFp methods using montgomery multiplication. * \return EC_METHOD object / const EC_METHOD EC_GFp_mont_method(void); /** Returns GFp methods using optimized methods for NIST recommended curves * \return EC_METHOD object / 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 / const EC_METHOD EC_GFp_nistp224_method(void); /** Returns 64-bit optimized methods for nistp256 * \return EC_METHOD object / const EC_METHOD EC_GFp_nistp256_method(void); /** Returns 64-bit optimized methods for nistp521 * \return EC_METHOD object / const EC_METHOD EC_GFp_nistp521_method(void); # endif # ifndef OPENSSL_NO_EC2M /*******************************************************************/ / EC_METHOD for curves over GF(2^m) / /*****************************************************************/ / Returns the basic GF2m ec method * \return EC_METHOD object / 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. / EC_GROUP EC_GROUP_new(const EC_METHOD meth); /* Frees a EC_GROUP object * \param group EC_GROUP object to be freed. / void EC_GROUP_free(EC_GROUP group); /** Clears and frees a EC_GROUP object * \param group EC_GROUP object to be cleared and freed. / void EC_GROUP_clear_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 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); /* Returns the EC_METHOD of the EC_GROUP object. * \param group EC_GROUP object * \return EC_METHOD used in this EC_GROUP object. / 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. / int EC_METHOD_get_field_type(const EC_METHOD meth); /** 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); 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 a ec curve defined by y^2 = x^3 + ax + b (for GFp) or y^2 + xy = x^3 + ax^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 + ax + b (for GFp) or y^2 + xy = x^3 + ax^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); /** 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 / DEPRECATEDIN_1_2_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 / DEPRECATEDIN_1_2_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 / DEPRECATEDIN_1_2_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 / DEPRECATEDIN_1_2_0(int EC_GROUP_get_curve_GF2m(const EC_GROUP group, BIGNUM p, BIGNUM a, BIGNUM b, BN_CTX ctx)) # endif /** 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 + ax + 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 + xy = x^3 + ax^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 a NID * \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); /*******************************************************************/ / 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); /** Returns the EC_METHOD used in EC_POINT object * \param point EC_POINT object * \return the EC_METHOD used / const EC_METHOD EC_POINT_method_of(const EC_POINT point); /* 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); /* 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 / 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 / int EC_POINT_get_Jprojective_coordinates_GFp(const EC_GROUP group, const EC_POINT p, BIGNUM x, BIGNUM y, BIGNUM z, BN_CTX ctx); /* 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); /** 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 / DEPRECATEDIN_1_2_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 / DEPRECATEDIN_1_2_0(int EC_POINT_get_affine_coordinates_GFp(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 * \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); /* 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 / DEPRECATEDIN_1_2_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 / DEPRECATEDIN_1_2_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 / DEPRECATEDIN_1_2_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 / DEPRECATEDIN_1_2_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 /* 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: / BIGNUM EC_POINT_point2bn(const EC_GROUP , const EC_POINT , point_conversion_form_t form, BIGNUM , BN_CTX ); EC_POINT EC_POINT_bn2point(const EC_GROUP , const BIGNUM , EC_POINT , BN_CTX ); 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); int EC_POINT_make_affine(const EC_GROUP group, EC_POINT point, BN_CTX ctx); 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 / 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); /* 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); /* 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 / 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 / int EC_GROUP_have_precompute_mult(const EC_GROUP group); /*******************************************************************/ / 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 # define OPENSSL_EC_EXPLICIT_CURVE 0x000 # define OPENSSL_EC_NAMED_CURVE 0x001 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_const(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)) int ECPKParameters_print(BIO bp, const EC_GROUP x, int off); # ifndef OPENSSL_NO_STDIO int ECPKParameters_print_fp(FILE fp, const EC_GROUP x, int off); # endif /******************************************************************/ / 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_NON_FIPS_ALLOW 0x1 # define EC_FLAG_FIPS_CHECKED 0x2 # define EC_FLAG_COFACTOR_ECDH 0x1000 /* Creates a new EC_KEY object. * \return EC_KEY object or NULL if an error occurred. / EC_KEY EC_KEY_new(void); int EC_KEY_get_flags(const EC_KEY key); void EC_KEY_set_flags(EC_KEY key, int flags); void EC_KEY_clear_flags(EC_KEY key, int flags); 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 nid NID of the named curve. * \return EC_KEY object or NULL if an error occurred. / EC_KEY EC_KEY_new_by_curve_name(int nid); /** Frees a EC_KEY object. * \param key EC_KEY object to be freed. / 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. / 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. / 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. / 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). / 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). / 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. / 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). / 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. / 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) / 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. / int EC_KEY_set_public_key(EC_KEY key, const EC_POINT pub); unsigned EC_KEY_get_enc_flags(const EC_KEY key); void EC_KEY_set_enc_flags(EC_KEY eckey, unsigned int flags); point_conversion_form_t EC_KEY_get_conv_form(const EC_KEY key); void EC_KEY_set_conv_form(EC_KEY eckey, point_conversion_form_t cform); #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) int EC_KEY_set_ex_data(EC_KEY key, int idx, void arg); void EC_KEY_get_ex_data(const EC_KEY key, int idx); / wrapper functions for the underlying EC_GROUP object / 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. / 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. / 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. / 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. / 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. / 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 / 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 / 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 / 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 / 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 / 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. / 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. / int i2d_ECPrivateKey(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. / 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. / int i2d_ECParameters(EC_KEY key, unsigned char out); /*****************************************************************/ / de- and encoding functions for EC public key / / (octet string, not DER -- hence 'o2i' and 'i2o') / /*****************************************************************/ / Decodes a 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. / EC_KEY o2i_ECPublicKey(EC_KEY key, const unsigned char in, long len); /** Encodes a 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 / 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 / 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 / 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 / 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 / int EC_KEY_print_fp(FILE fp, const EC_KEY key, int off); # endif const EC_KEY_METHOD EC_KEY_OpenSSL(void); const EC_KEY_METHOD EC_KEY_get_default_method(void); void EC_KEY_set_default_method(const EC_KEY_METHOD meth); const EC_KEY_METHOD EC_KEY_get_method(const EC_KEY key); int EC_KEY_set_method(EC_KEY key, const EC_KEY_METHOD meth); 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 / 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); 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)); 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); /** DER encode content of ECDSA_SIG object (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 / int i2d_ECDSA_SIG(const ECDSA_SIG sig, unsigned char pp); / Decodes a DER encoded ECDSA signature (note: this function changes 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) / ECDSA_SIG d2i_ECDSA_SIG(ECDSA_SIG sig, const unsigned char pp, long len); /** 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 (may be NULL) * \param s pointer to BIGNUM for s (may be NULL) / int ECDSA_SIG_set0(ECDSA_SIG sig, BIGNUM r, BIGNUM s); /** 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 / 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 / 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 / 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 / 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 / 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 / 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 / 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 / int ECDSA_size(const EC_KEY eckey); /*******************************************************************/ / EC_KEY_METHOD constructors, destructors, writers and accessors / /******************************************************************/ EC_KEY_METHOD EC_KEY_METHOD_new(const EC_KEY_METHOD meth); void EC_KEY_METHOD_free(EC_KEY_METHOD meth); 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)); void EC_KEY_METHOD_set_keygen(EC_KEY_METHOD meth, int (keygen)(EC_KEY key)); 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)); 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)); 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)); 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)); void EC_KEY_METHOD_get_keygen(const EC_KEY_METHOD meth, int (*pkeygen)(EC_KEY key)); 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)); 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)); 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)); # 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 # define EVP_PKEY_CTX_set_ec_paramgen_curve_nid(ctx, nid) \ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \ EVP_PKEY_OP_PARAMGEN\|EVP_PKEY_OP_KEYGEN, \ EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID, nid, NULL) # define EVP_PKEY_CTX_set_ec_param_enc(ctx, flag) \ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \ EVP_PKEY_OP_PARAMGEN\|EVP_PKEY_OP_KEYGEN, \ EVP_PKEY_CTRL_EC_PARAM_ENC, flag, NULL) # define EVP_PKEY_CTX_set_ecdh_cofactor_mode(ctx, flag) \ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \ EVP_PKEY_OP_DERIVE, \ EVP_PKEY_CTRL_EC_ECDH_COFACTOR, flag, NULL) # define EVP_PKEY_CTX_get_ecdh_cofactor_mode(ctx) \ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \ EVP_PKEY_OP_DERIVE, \ EVP_PKEY_CTRL_EC_ECDH_COFACTOR, -2, NULL) # define EVP_PKEY_CTX_set_ecdh_kdf_type(ctx, kdf) \ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \ EVP_PKEY_OP_DERIVE, \ EVP_PKEY_CTRL_EC_KDF_TYPE, kdf, NULL) # define EVP_PKEY_CTX_get_ecdh_kdf_type(ctx) \ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \ EVP_PKEY_OP_DERIVE, \ EVP_PKEY_CTRL_EC_KDF_TYPE, -2, NULL) # define EVP_PKEY_CTX_set_ecdh_kdf_md(ctx, md) \ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \ EVP_PKEY_OP_DERIVE, \ EVP_PKEY_CTRL_EC_KDF_MD, 0, (void )(md)) # define EVP_PKEY_CTX_get_ecdh_kdf_md(ctx, pmd) \ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \ EVP_PKEY_OP_DERIVE, \ EVP_PKEY_CTRL_GET_EC_KDF_MD, 0, (void )(pmd)) # define EVP_PKEY_CTX_set_ecdh_kdf_outlen(ctx, len) \ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \ EVP_PKEY_OP_DERIVE, \ EVP_PKEY_CTRL_EC_KDF_OUTLEN, len, NULL) # define EVP_PKEY_CTX_get_ecdh_kdf_outlen(ctx, plen) \ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \ EVP_PKEY_OP_DERIVE, \ EVP_PKEY_CTRL_GET_EC_KDF_OUTLEN, 0, \ (void )(plen)) # define EVP_PKEY_CTX_set0_ecdh_kdf_ukm(ctx, p, plen) \ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \ EVP_PKEY_OP_DERIVE, \ EVP_PKEY_CTRL_EC_KDF_UKM, plen, (void )(p)) # define EVP_PKEY_CTX_get0_ecdh_kdf_ukm(ctx, p) \ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \ EVP_PKEY_OP_DERIVE, \ EVP_PKEY_CTRL_GET_EC_KDF_UKM, 0, (void )(p)) / SM2 will skip the operation check so no need to pass operation here / # define EVP_PKEY_CTX_set1_id(ctx, id, id_len) \ EVP_PKEY_CTX_ctrl(ctx, -1, -1, \ EVP_PKEY_CTRL_SET1_ID, (int)id_len, (void)(id)) # define EVP_PKEY_CTX_get1_id(ctx, id) \ EVP_PKEY_CTX_ctrl(ctx, -1, -1, \ EVP_PKEY_CTRL_GET1_ID, 0, (void)(id)) # define EVP_PKEY_CTX_get1_id_len(ctx, id_len) \ EVP_PKEY_CTX_ctrl(ctx, -1, -1, \ EVP_PKEY_CTRL_GET1_ID_LEN, 0, (void)(id_len)) # 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) # define EVP_PKEY_CTRL_SET1_ID (EVP_PKEY_ALG_CTRL + 11) # define EVP_PKEY_CTRL_GET1_ID (EVP_PKEY_ALG_CTRL + 12) # define EVP_PKEY_CTRL_GET1_ID_LEN (EVP_PKEY_ALG_CTRL + 13) /* 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 mistakingly 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 # ifdef __cplusplus } # endif # endif #endif Back

Edit File : ec.h | Size : 62.19 KB

/*
 * Copyright 2002-2021 The OpenSSL Project Authors. All Rights Reserved.
 * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
 *
 * Licensed under the OpenSSL license (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 HEADER_EC_H
# define HEADER_EC_H

# include <openssl/opensslconf.h>

# ifndef OPENSSL_NO_EC
# include <openssl/asn1.h>
# include <openssl/symhacks.h>
# if OPENSSL_API_COMPAT < 0x10100000L
#  include <openssl/bn.h>
# endif
# include <openssl/ecerr.h>
# ifdef  __cplusplus
extern "C" {
# endif

# ifndef OPENSSL_ECC_MAX_FIELD_BITS
#  define OPENSSL_ECC_MAX_FIELD_BITS 661
# endif

/** 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;

typedef struct ec_method_st EC_METHOD;
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)                   */
/********************************************************************/

/** Returns the basic GFp ec methods which provides the basis for the
 *  optimized methods.
 *  \return  EC_METHOD object
 */
const EC_METHOD *EC_GFp_simple_method(void);

/** Returns GFp methods using montgomery multiplication.
 *  \return  EC_METHOD object
 */
const EC_METHOD *EC_GFp_mont_method(void);

/** Returns GFp methods using optimized methods for NIST recommended curves
 *  \return  EC_METHOD object
 */
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
 */
const EC_METHOD *EC_GFp_nistp224_method(void);

/** Returns 64-bit optimized methods for nistp256
 *  \return  EC_METHOD object
 */
const EC_METHOD *EC_GFp_nistp256_method(void);

/** Returns 64-bit optimized methods for nistp521
 *  \return  EC_METHOD object
 */
const EC_METHOD *EC_GFp_nistp521_method(void);
# endif

# ifndef OPENSSL_NO_EC2M
/********************************************************************/
/*           EC_METHOD for curves over GF(2^m)                      */
/********************************************************************/

/** Returns the basic GF2m ec method
 *  \return  EC_METHOD object
 */
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.
 */
EC_GROUP *EC_GROUP_new(const EC_METHOD *meth);

/** Frees a EC_GROUP object
 *  \param  group  EC_GROUP object to be freed.
 */
void EC_GROUP_free(EC_GROUP *group);

/** Clears and frees a EC_GROUP object
 *  \param  group  EC_GROUP object to be cleared and freed.
 */
void EC_GROUP_clear_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 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);

/** Returns the EC_METHOD of the EC_GROUP object.
 *  \param  group  EC_GROUP object
 *  \return EC_METHOD used in this EC_GROUP object.
 */
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.
 */
int EC_METHOD_get_field_type(const EC_METHOD *meth);

/** 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);

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 a 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);

/** 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
 */
DEPRECATEDIN_1_2_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
 */
DEPRECATEDIN_1_2_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
 */
DEPRECATEDIN_1_2_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
 */
DEPRECATEDIN_1_2_0(int EC_GROUP_get_curve_GF2m(const EC_GROUP *group, BIGNUM *p,
                                               BIGNUM *a, BIGNUM *b,
                                               BN_CTX *ctx))
# endif
/** 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 a NID
 *  \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);

/********************************************************************/
/*                    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);

/** Returns the EC_METHOD used in EC_POINT object
 *  \param  point  EC_POINT object
 *  \return the EC_METHOD used
 */
const EC_METHOD *EC_POINT_method_of(const EC_POINT *point);

/** 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);

/** 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
 */
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
 */
int EC_POINT_get_Jprojective_coordinates_GFp(const EC_GROUP *group,
                                             const EC_POINT *p, BIGNUM *x,
                                             BIGNUM *y, BIGNUM *z,
                                             BN_CTX *ctx);

/** 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);

/** 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
 */
DEPRECATEDIN_1_2_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
 */
DEPRECATEDIN_1_2_0(int EC_POINT_get_affine_coordinates_GFp(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
 *  \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);

/** 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
 */
DEPRECATEDIN_1_2_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
 */
DEPRECATEDIN_1_2_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
 */
DEPRECATEDIN_1_2_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
 */
DEPRECATEDIN_1_2_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
/** 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: */
BIGNUM *EC_POINT_point2bn(const EC_GROUP *, const EC_POINT *,
                          point_conversion_form_t form, BIGNUM *, BN_CTX *);
EC_POINT *EC_POINT_bn2point(const EC_GROUP *, const BIGNUM *,
                            EC_POINT *, BN_CTX *);
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);

int EC_POINT_make_affine(const EC_GROUP *group, EC_POINT *point, BN_CTX *ctx);
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
 */
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);

/** 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);

/** 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
 */
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
 */
int EC_GROUP_have_precompute_mult(const EC_GROUP *group);

/********************************************************************/
/*                       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

# define OPENSSL_EC_EXPLICIT_CURVE  0x000
# define OPENSSL_EC_NAMED_CURVE     0x001

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_const(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))

int ECPKParameters_print(BIO *bp, const EC_GROUP *x, int off);
# ifndef OPENSSL_NO_STDIO
int ECPKParameters_print_fp(FILE *fp, const EC_GROUP *x, int off);
# endif

/********************************************************************/
/*                      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_NON_FIPS_ALLOW  0x1
# define EC_FLAG_FIPS_CHECKED    0x2
# define EC_FLAG_COFACTOR_ECDH   0x1000

/** Creates a new EC_KEY object.
 *  \return EC_KEY object or NULL if an error occurred.
 */
EC_KEY *EC_KEY_new(void);

int EC_KEY_get_flags(const EC_KEY *key);

void EC_KEY_set_flags(EC_KEY *key, int flags);

void EC_KEY_clear_flags(EC_KEY *key, int flags);

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  nid  NID of the named curve.
 *  \return EC_KEY object or NULL if an error occurred.
 */
EC_KEY *EC_KEY_new_by_curve_name(int nid);

/** Frees a EC_KEY object.
 *  \param  key  EC_KEY object to be freed.
 */
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.
 */
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.
 */
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.
 */
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).
 */
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).
 */
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.
 */
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).
 */
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.
 */
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)
 */
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.
 */
int EC_KEY_set_public_key(EC_KEY *key, const EC_POINT *pub);

unsigned EC_KEY_get_enc_flags(const EC_KEY *key);
void EC_KEY_set_enc_flags(EC_KEY *eckey, unsigned int flags);
point_conversion_form_t EC_KEY_get_conv_form(const EC_KEY *key);
void EC_KEY_set_conv_form(EC_KEY *eckey, point_conversion_form_t cform);

#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)
int EC_KEY_set_ex_data(EC_KEY *key, int idx, void *arg);
void *EC_KEY_get_ex_data(const EC_KEY *key, int idx);

/* wrapper functions for the underlying EC_GROUP object */
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.
 */
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.
 */
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.
 */
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.
 */
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.
 */
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
 */
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
 */

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
 */

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
 */

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
 */
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.
 */
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.
 */
int i2d_ECPrivateKey(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.
 */
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.
 */
int i2d_ECParameters(EC_KEY *key, unsigned char **out);

/********************************************************************/
/*         de- and encoding functions for EC public key             */
/*         (octet string, not DER -- hence 'o2i' and 'i2o')         */
/********************************************************************/

/** Decodes a 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.
 */
EC_KEY *o2i_ECPublicKey(EC_KEY **key, const unsigned char **in, long len);

/** Encodes a 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
 */
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
 */
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
 */
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
 */
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
 */
int EC_KEY_print_fp(FILE *fp, const EC_KEY *key, int off);

# endif

const EC_KEY_METHOD *EC_KEY_OpenSSL(void);
const EC_KEY_METHOD *EC_KEY_get_default_method(void);
void EC_KEY_set_default_method(const EC_KEY_METHOD *meth);
const EC_KEY_METHOD *EC_KEY_get_method(const EC_KEY *key);
int EC_KEY_set_method(EC_KEY *key, const EC_KEY_METHOD *meth);
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
 */
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);

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));

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);

/** DER encode content of ECDSA_SIG object (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
 */
int i2d_ECDSA_SIG(const ECDSA_SIG *sig, unsigned char **pp);

/** Decodes a DER encoded ECDSA signature (note: this function changes *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)
 */
ECDSA_SIG *d2i_ECDSA_SIG(ECDSA_SIG **sig, const unsigned char **pp, long len);

/** 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 (may be NULL)
 *  \param  s    pointer to BIGNUM for s (may be NULL)
 */
int ECDSA_SIG_set0(ECDSA_SIG *sig, BIGNUM *r, BIGNUM *s);

/** 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
 */
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
 */
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
 */
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
 */
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
 */
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
 */
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
 */
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
 */
int ECDSA_size(const EC_KEY *eckey);

/********************************************************************/
/*  EC_KEY_METHOD constructors, destructors, writers and accessors  */
/********************************************************************/

EC_KEY_METHOD *EC_KEY_METHOD_new(const EC_KEY_METHOD *meth);
void EC_KEY_METHOD_free(EC_KEY_METHOD *meth);
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));

void EC_KEY_METHOD_set_keygen(EC_KEY_METHOD *meth,
                              int (*keygen)(EC_KEY *key));

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));

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));

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));

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));

void EC_KEY_METHOD_get_keygen(const EC_KEY_METHOD *meth,
                              int (**pkeygen)(EC_KEY *key));

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));

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));

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));

# 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

# define EVP_PKEY_CTX_set_ec_paramgen_curve_nid(ctx, nid) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \
                                EVP_PKEY_OP_PARAMGEN|EVP_PKEY_OP_KEYGEN, \
                                EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID, nid, NULL)

# define EVP_PKEY_CTX_set_ec_param_enc(ctx, flag) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \
                                EVP_PKEY_OP_PARAMGEN|EVP_PKEY_OP_KEYGEN, \
                                EVP_PKEY_CTRL_EC_PARAM_ENC, flag, NULL)

# define EVP_PKEY_CTX_set_ecdh_cofactor_mode(ctx, flag) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \
                                EVP_PKEY_OP_DERIVE, \
                                EVP_PKEY_CTRL_EC_ECDH_COFACTOR, flag, NULL)

# define EVP_PKEY_CTX_get_ecdh_cofactor_mode(ctx) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \
                                EVP_PKEY_OP_DERIVE, \
                                EVP_PKEY_CTRL_EC_ECDH_COFACTOR, -2, NULL)

# define EVP_PKEY_CTX_set_ecdh_kdf_type(ctx, kdf) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \
                                EVP_PKEY_OP_DERIVE, \
                                EVP_PKEY_CTRL_EC_KDF_TYPE, kdf, NULL)

# define EVP_PKEY_CTX_get_ecdh_kdf_type(ctx) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \
                                EVP_PKEY_OP_DERIVE, \
                                EVP_PKEY_CTRL_EC_KDF_TYPE, -2, NULL)

# define EVP_PKEY_CTX_set_ecdh_kdf_md(ctx, md) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \
                                EVP_PKEY_OP_DERIVE, \
                                EVP_PKEY_CTRL_EC_KDF_MD, 0, (void *)(md))

# define EVP_PKEY_CTX_get_ecdh_kdf_md(ctx, pmd) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \
                                EVP_PKEY_OP_DERIVE, \
                                EVP_PKEY_CTRL_GET_EC_KDF_MD, 0, (void *)(pmd))

# define EVP_PKEY_CTX_set_ecdh_kdf_outlen(ctx, len) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \
                                EVP_PKEY_OP_DERIVE, \
                                EVP_PKEY_CTRL_EC_KDF_OUTLEN, len, NULL)

# define EVP_PKEY_CTX_get_ecdh_kdf_outlen(ctx, plen) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \
                                EVP_PKEY_OP_DERIVE, \
                                EVP_PKEY_CTRL_GET_EC_KDF_OUTLEN, 0, \
                                (void *)(plen))

# define EVP_PKEY_CTX_set0_ecdh_kdf_ukm(ctx, p, plen) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \
                                EVP_PKEY_OP_DERIVE, \
                                EVP_PKEY_CTRL_EC_KDF_UKM, plen, (void *)(p))

# define EVP_PKEY_CTX_get0_ecdh_kdf_ukm(ctx, p) \
        EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \
                                EVP_PKEY_OP_DERIVE, \
                                EVP_PKEY_CTRL_GET_EC_KDF_UKM, 0, (void *)(p))

/* SM2 will skip the operation check so no need to pass operation here */
# define EVP_PKEY_CTX_set1_id(ctx, id, id_len) \
        EVP_PKEY_CTX_ctrl(ctx, -1, -1, \
                                EVP_PKEY_CTRL_SET1_ID, (int)id_len, (void*)(id))

# define EVP_PKEY_CTX_get1_id(ctx, id) \
        EVP_PKEY_CTX_ctrl(ctx, -1, -1, \
                                EVP_PKEY_CTRL_GET1_ID, 0, (void*)(id))

# define EVP_PKEY_CTX_get1_id_len(ctx, id_len) \
        EVP_PKEY_CTX_ctrl(ctx, -1, -1, \
                                EVP_PKEY_CTRL_GET1_ID_LEN, 0, (void*)(id_len))

# 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)
# define EVP_PKEY_CTRL_SET1_ID                           (EVP_PKEY_ALG_CTRL + 11)
# define EVP_PKEY_CTRL_GET1_ID                           (EVP_PKEY_ALG_CTRL + 12)
# define EVP_PKEY_CTRL_GET1_ID_LEN                       (EVP_PKEY_ALG_CTRL + 13)
/* 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 mistakingly 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

#  ifdef  __cplusplus
}
#  endif
# endif
#endif

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