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Filename : EC_KEY_set_conv_form.3
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.\" ========================================================================
.\"
.IX Title "EC_KEY_new 3"
.TH EC_KEY_new 3 2019-12-20 1.0.2u OpenSSL
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.nh
.SH NAME
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_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_enc_flags, EC_KEY_set_enc_flags, EC_KEY_get_conv_form, EC_KEY_set_conv_form, EC_KEY_get_key_method_data, EC_KEY_insert_key_method_data, EC_KEY_set_asn1_flag, EC_KEY_precompute_mult, EC_KEY_generate_key, EC_KEY_check_key, EC_KEY_set_public_key_affine_coordinates \- Functions for creating, destroying and manipulating EC_KEY objects.
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 2
\& #include <openssl/ec.h>
\& #include <openssl/bn.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);
\& 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_get_key_method_data(EC_KEY *key, 
\&        void *(*dup_func)(void *), void (*free_func)(void *), void (*clear_free_func)(void *));
\& void EC_KEY_insert_key_method_data(EC_KEY *key, void *data,
\&        void *(*dup_func)(void *), void (*free_func)(void *), void (*clear_free_func)(void *));
\& void EC_KEY_set_asn1_flag(EC_KEY *eckey, int asn1_flag);
\& 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);
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
An EC_KEY represents a public key and (optionaly) an 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.
.PP
Alternatively a new EC_KEY can be constructed by calling EC_KEY_new_by_curve_name and supplying the nid of the associated curve. Refer to \fBEC_GROUP_new\fR\|(3) for a description of curve names. This function simply wraps calls to EC_KEY_new and 
EC_GROUP_new_by_curve_name.
.PP
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.
.PP
EC_KEY_copy copies the contents of the EC_KEY in \fBsrc\fR into \fBdest\fR.
.PP
EC_KEY_dup creates a new EC_KEY object and copies \fBec_key\fR into it.
.PP
EC_KEY_up_ref increments the reference count associated with the EC_KEY object.
.PP
EC_KEY_generate_key generates a new public and private key for the supplied \fBeckey\fR object. \fBeckey\fR 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.
.PP
EC_KEY_check_key performs various sanity checks on the EC_KEY object to confirm that it is valid.
.PP
EC_KEY_set_public_key_affine_coordinates sets the public key for \fBkey\fR based on its affine co-ordinates, i.e. it constructs an EC_POINT
object based on the supplied \fBx\fR and \fBy\fR values and sets the public key to be this EC_POINT. It will also performs certain sanity checks
on the key to confirm that it is valid.
.PP
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 \fBkey\fR respectively.
.PP
The functions EC_KEY_get_conv_form and EC_KEY_set_conv_form get and set the point_conversion_form for the \fBkey\fR. For a description
of point_conversion_forms please refer to \fBEC_POINT_new\fR\|(3).
.PP
EC_KEY_insert_key_method_data and EC_KEY_get_key_method_data enable the caller to associate arbitrary additional data specific to the
elliptic curve scheme being used with the EC_KEY object. This data is treated as a "black box" by the ec library. The data to be stored by EC_KEY_insert_key_method_data is provided in the \fBdata\fR parameter, which must have associated functions for duplicating, freeing and "clear_freeing" the data item. If a subsequent EC_KEY_get_key_method_data call is issued, the functions for duplicating, freeing and "clear_freeing" the data item must be provided again, and they must be the same as they were when the data item was inserted.
.PP
EC_KEY_set_flags sets the flags in the \fBflags\fR parameter on the EC_KEY object. Any flags that are already set are left set. The currently defined standard flags 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 and is defined in ecdh.h. 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 \fBflags\fR parameter. All other flags are left in their existing state.
.PP
EC_KEY_set_asn1_flag sets the asn1_flag on the underlying EC_GROUP object (if set). Refer to \fBEC_GROUP_copy\fR\|(3) for further information on the asn1_flag.
.PP
EC_KEY_precompute_mult stores multiples of the underlying EC_GROUP generator for faster point multiplication. See also \fBEC_POINT_add\fR\|(3).
.SH "RETURN VALUES"
.IX Header "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.
.PP
EC_KEY_get_flags returns the flags associated with the EC_KEY object as an integer.
.PP
EC_KEY_copy returns a pointer to the destination key, or NULL on error.
.PP
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 and EC_KEY_set_public_key_affine_coordinates return 1 on success or 0 on error.
.PP
EC_KEY_get0_group returns the EC_GROUP associated with the EC_KEY.
.PP
EC_KEY_get0_private_key returns the private key associated with the EC_KEY.
.PP
EC_KEY_get_conv_form return the point_conversion_form for the EC_KEY.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBcrypto\fR\|(3), \fBec\fR\|(3), \fBEC_GROUP_new\fR\|(3),
\&\fBEC_GROUP_copy\fR\|(3), \fBEC_POINT_new\fR\|(3),
\&\fBEC_POINT_add\fR\|(3),
\&\fBEC_GFp_simple_method\fR\|(3),
\&\fBd2i_ECPKParameters\fR\|(3)