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EC_KEY_NEW(3)                       OpenSSL                      EC_KEY_NEW(3)
NAME
       EC_KEY_get_method, EC_KEY_set_method, EC_KEY_new, EC_KEY_get_flags,
       EC_KEY_set_flags, EC_KEY_clear_flags, EC_KEY_new_by_curve_name,
       EC_KEY_free, EC_KEY_copy, EC_KEY_dup, EC_KEY_up_ref,
       EC_KEY_get0_engine, EC_KEY_get0_group, EC_KEY_set_group,
       EC_KEY_get0_private_key, EC_KEY_set_private_key,
       EC_KEY_get0_public_key, EC_KEY_set_public_key, EC_KEY_get_conv_form,
       EC_KEY_set_conv_form, EC_KEY_set_asn1_flag,
       EC_KEY_decoded_from_explicit_params, EC_KEY_precompute_mult,
       EC_KEY_generate_key, EC_KEY_check_key,
       EC_KEY_set_public_key_affine_coordinates, EC_KEY_oct2key,
       EC_KEY_key2buf, EC_KEY_oct2priv, EC_KEY_priv2oct, EC_KEY_priv2buf -
       Functions for creating, destroying and manipulating EC_KEY objects
SYNOPSIS
        #include <openssl/ec.h>
        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);
        EC_KEY *EC_KEY_new_by_curve_name(int nid);
        void EC_KEY_free(EC_KEY *key);
        EC_KEY *EC_KEY_copy(EC_KEY *dst, const EC_KEY *src);
        EC_KEY *EC_KEY_dup(const EC_KEY *src);
        int EC_KEY_up_ref(EC_KEY *key);
        ENGINE *EC_KEY_get0_engine(const EC_KEY *eckey);
        const EC_GROUP *EC_KEY_get0_group(const EC_KEY *key);
        int EC_KEY_set_group(EC_KEY *key, const EC_GROUP *group);
        const BIGNUM *EC_KEY_get0_private_key(const EC_KEY *key);
        int EC_KEY_set_private_key(EC_KEY *key, const BIGNUM *prv);
        const EC_POINT *EC_KEY_get0_public_key(const EC_KEY *key);
        int EC_KEY_set_public_key(EC_KEY *key, const EC_POINT *pub);
        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);
        void EC_KEY_set_asn1_flag(EC_KEY *eckey, int asn1_flag);
        int EC_KEY_decoded_from_explicit_params(const EC_KEY *key);
        int EC_KEY_precompute_mult(EC_KEY *key, BN_CTX *ctx);
        int EC_KEY_generate_key(EC_KEY *key);
        int EC_KEY_check_key(const EC_KEY *key);
        int EC_KEY_set_public_key_affine_coordinates(EC_KEY *key, BIGNUM *x, BIGNUM *y);
        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);
        int EC_KEY_oct2key(EC_KEY *eckey, const unsigned char *buf, size_t len, BN_CTX *ctx);
        size_t EC_KEY_key2buf(const EC_KEY *eckey, point_conversion_form_t form,
                              unsigned char **pbuf, BN_CTX *ctx);
        int EC_KEY_oct2priv(EC_KEY *eckey, const unsigned char *buf, size_t len);
        size_t EC_KEY_priv2oct(const EC_KEY *eckey, unsigned char *buf, size_t len);
        size_t EC_KEY_priv2buf(const EC_KEY *eckey, unsigned char **pbuf);
DESCRIPTION
       An EC_KEY represents a public key and, optionally, the associated
       private key. A new EC_KEY with no associated curve can be constructed
       by calling EC_KEY_new(). The reference count for the newly created
       EC_KEY is initially set to 1. A curve can be associated with the EC_KEY
       by calling EC_KEY_set_group().
       Alternatively a new EC_KEY can be constructed by calling
       EC_KEY_new_by_curve_name() and supplying the nid of the associated
       curve. See EC_GROUP_new(3) for a description of curve names. This
       function simply wraps calls to EC_KEY_new() and
       EC_GROUP_new_by_curve_name().
       Calling EC_KEY_free() decrements the reference count for the EC_KEY
       object, and if it has dropped to zero then frees the memory associated
       with it.  If key is NULL nothing is done.
       EC_KEY_copy() copies the contents of the EC_KEY in src into dest.
       EC_KEY_dup() creates a new EC_KEY object and copies ec_key into it.
       EC_KEY_up_ref() increments the reference count associated with the
       EC_KEY object.
       EC_KEY_get0_engine() returns a handle to the ENGINE that has been set
       for this EC_KEY object.
       EC_KEY_generate_key() generates a new public and private key for the
       supplied eckey object. eckey must have an EC_GROUP object associated
       with it before calling this function. The private key is a random
       integer (0 < priv_key < order, where order is the order of the EC_GROUP
       object). The public key is an EC_POINT on the curve calculated by
       multiplying the generator for the curve by the private key.
       EC_KEY_check_key() performs various sanity checks on the EC_KEY object
       to confirm that it is valid.
       EC_KEY_set_public_key_affine_coordinates() sets the public key for key
       based on its affine co-ordinates; i.e., it constructs an EC_POINT
       object based on the supplied x and y values and sets the public key to
       be this EC_POINT. It also performs certain sanity checks on the key to
       confirm that it is valid.
       The functions EC_KEY_get0_group(), EC_KEY_set_group(),
       EC_KEY_get0_private_key(), EC_KEY_set_private_key(),
       EC_KEY_get0_public_key(), and EC_KEY_set_public_key() get and set the
       EC_GROUP object, the private key, and the EC_POINT public key for the
       key respectively.
       The functions EC_KEY_get_conv_form() and EC_KEY_set_conv_form() get and
       set the point_conversion_form for the key. For a description of
       point_conversion_forms please see EC_POINT_new(3).
       EC_KEY_set_flags() sets the flags in the flags parameter on the EC_KEY
       object. Any flags that are already set are left set. The flags
       currently defined are EC_FLAG_NON_FIPS_ALLOW and EC_FLAG_FIPS_CHECKED.
       In addition there is the flag EC_FLAG_COFACTOR_ECDH which is specific
       to ECDH.  EC_KEY_get_flags() returns the current flags that are set for
       this EC_KEY.  EC_KEY_clear_flags() clears the flags indicated by the
       flags parameter; all other flags are left in their existing state.
       EC_KEY_set_asn1_flag() sets the asn1_flag on the underlying EC_GROUP
       object (if set). Refer to EC_GROUP_copy(3) for further information on
       the asn1_flag.
       EC_KEY_decoded_from_explicit_params() returns 1 if the group of the key
       was decoded from data with explicitly encoded group parameters, -1 if
       the key is NULL or the group parameters are missing, and 0 otherwise.
       EC_KEY_precompute_mult() stores multiples of the underlying EC_GROUP
       generator for faster point multiplication. See also EC_POINT_add(3).
       EC_KEY_oct2key() and EC_KEY_key2buf() are identical to the functions
       EC_POINT_oct2point() and EC_POINT_point2buf() except they use the
       public key EC_POINT in eckey.
       EC_KEY_oct2priv() and EC_KEY_priv2oct() convert between the private key
       component of eckey and octet form. The octet form consists of the
       content octets of the privateKey OCTET STRING in an ECPrivateKey ASN.1
       structure.
       The function EC_KEY_priv2oct() must be supplied with a buffer long
       enough to store the octet form. The return value provides the number of
       octets stored.  Calling the function with a NULL buffer will not
       perform the conversion but will just return the required buffer length.
       The function EC_KEY_priv2buf() allocates a buffer of suitable length
       and writes an EC_KEY to it in octet format. The allocated buffer is
       written to *pbuf and its length is returned. The caller must free up
       the allocated buffer with a call to OPENSSL_free(). Since the allocated
       buffer value is written to *pbuf the pbuf parameter MUST NOT be NULL.
       EC_KEY_priv2buf() converts an EC_KEY private key into an allocated
       buffer.
RETURN VALUES
       EC_KEY_new(), EC_KEY_new_by_curve_name() and EC_KEY_dup() return a
       pointer to the newly created EC_KEY object, or NULL on error.
       EC_KEY_get_flags() returns the flags associated with the EC_KEY object
       as an integer.
       EC_KEY_copy() returns a pointer to the destination key, or NULL on
       error.
       EC_KEY_get0_engine() returns a pointer to an ENGINE, or NULL if it
       wasn't set.
       EC_KEY_up_ref(), EC_KEY_set_group(), EC_KEY_set_private_key(),
       EC_KEY_set_public_key(), EC_KEY_precompute_mult(),
       EC_KEY_generate_key(), EC_KEY_check_key(),
       EC_KEY_set_public_key_affine_coordinates(), EC_KEY_oct2key() and
       EC_KEY_oct2priv() return 1 on success or 0 on error.
       EC_KEY_get0_group() returns the EC_GROUP associated with the EC_KEY.
       EC_KEY_get0_private_key() returns the private key associated with the
       EC_KEY.
       EC_KEY_get_conv_form() return the point_conversion_form for the EC_KEY.
       EC_KEY_key2buf(), EC_KEY_priv2oct() and EC_KEY_priv2buf() return the
       length of the buffer or 0 on error.
SEE ALSO
       crypto(7), EC_GROUP_new(3), EC_GROUP_copy(3), EC_POINT_new(3),
       EC_POINT_add(3), EC_GFp_simple_method(3), d2i_ECPKParameters(3)
COPYRIGHT
       Copyright 2013-2020 The OpenSSL Project Authors. 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>;.
1.1.1k                            2021-03-25                     EC_KEY_NEW(3)