EC_POINT_NEW(3ossl) OpenSSL EC_POINT_NEW(3ossl)
NAME
EC_POINT_set_Jprojective_coordinates_GFp, EC_POINT_point2buf,
EC_POINT_new, EC_POINT_free, EC_POINT_clear_free, EC_POINT_copy,
EC_POINT_dup, EC_POINT_method_of, EC_POINT_set_to_infinity,
EC_POINT_get_Jprojective_coordinates_GFp,
EC_POINT_set_affine_coordinates, EC_POINT_get_affine_coordinates,
EC_POINT_set_compressed_coordinates,
EC_POINT_set_affine_coordinates_GFp,
EC_POINT_get_affine_coordinates_GFp,
EC_POINT_set_compressed_coordinates_GFp,
EC_POINT_set_affine_coordinates_GF2m,
EC_POINT_get_affine_coordinates_GF2m,
EC_POINT_set_compressed_coordinates_GF2m, EC_POINT_point2oct,
EC_POINT_oct2point, EC_POINT_point2bn, EC_POINT_bn2point,
EC_POINT_point2hex, EC_POINT_hex2point - Functions for creating,
destroying and manipulating EC_POINT objects
SYNOPSIS
#include <openssl/ec.h>
EC_POINT *EC_POINT_new(const EC_GROUP *group);
void EC_POINT_free(EC_POINT *point);
void EC_POINT_clear_free(EC_POINT *point);
int EC_POINT_copy(EC_POINT *dst, const EC_POINT *src);
EC_POINT *EC_POINT_dup(const EC_POINT *src, const EC_GROUP *group);
int EC_POINT_set_to_infinity(const EC_GROUP *group, EC_POINT *point);
int EC_POINT_set_affine_coordinates(const EC_GROUP *group, EC_POINT *p,
const BIGNUM *x, const BIGNUM *y,
BN_CTX *ctx);
int EC_POINT_get_affine_coordinates(const EC_GROUP *group, const EC_POINT *p,
BIGNUM *x, BIGNUM *y, BN_CTX *ctx);
int EC_POINT_set_compressed_coordinates(const EC_GROUP *group, EC_POINT *p,
const BIGNUM *x, int y_bit,
BN_CTX *ctx);
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);
size_t EC_POINT_point2buf(const EC_GROUP *group, const EC_POINT *point,
point_conversion_form_t form,
unsigned char **pbuf, BN_CTX *ctx);
int EC_POINT_oct2point(const EC_GROUP *group, EC_POINT *p,
const unsigned char *buf, size_t len, BN_CTX *ctx);
char *EC_POINT_point2hex(const EC_GROUP *group, const EC_POINT *p,
point_conversion_form_t form, BN_CTX *ctx);
EC_POINT *EC_POINT_hex2point(const EC_GROUP *group, const char *hex,
EC_POINT *p, BN_CTX *ctx);
The following functions have been deprecated since OpenSSL 3.0, and can
be hidden entirely by defining OPENSSL_API_COMPAT with a suitable
version value, see openssl_user_macros(7):
const EC_METHOD *EC_POINT_method_of(const EC_POINT *point);
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);
int EC_POINT_get_Jprojective_coordinates_GFp(const EC_GROUP *group,
const EC_POINT *p,
BIGNUM *x, BIGNUM *y, BIGNUM *z,
BN_CTX *ctx);
int EC_POINT_set_affine_coordinates_GFp(const EC_GROUP *group, EC_POINT *p,
const BIGNUM *x, const BIGNUM *y,
BN_CTX *ctx);
int EC_POINT_get_affine_coordinates_GFp(const EC_GROUP *group,
const EC_POINT *p,
BIGNUM *x, BIGNUM *y, BN_CTX *ctx);
int EC_POINT_set_compressed_coordinates_GFp(const EC_GROUP *group,
EC_POINT *p,
const BIGNUM *x, int y_bit,
BN_CTX *ctx);
int EC_POINT_set_affine_coordinates_GF2m(const EC_GROUP *group, EC_POINT *p,
const BIGNUM *x, const BIGNUM *y,
BN_CTX *ctx);
int EC_POINT_get_affine_coordinates_GF2m(const EC_GROUP *group,
const EC_POINT *p,
BIGNUM *x, BIGNUM *y, BN_CTX *ctx);
int EC_POINT_set_compressed_coordinates_GF2m(const EC_GROUP *group,
EC_POINT *p,
const BIGNUM *x, int y_bit,
BN_CTX *ctx);
BIGNUM *EC_POINT_point2bn(const EC_GROUP *group, const EC_POINT *p,
point_conversion_form_t form, BIGNUM *bn,
BN_CTX *ctx);
EC_POINT *EC_POINT_bn2point(const EC_GROUP *group, const BIGNUM *bn,
EC_POINT *p, BN_CTX *ctx);
DESCRIPTION
An EC_POINT structure represents a point on a curve. A new point is
constructed by calling the function EC_POINT_new(3) and providing the
group object that the point relates to.
EC_POINT_free() frees the memory associated with the EC_POINT. if
point is NULL nothing is done.
EC_POINT_clear_free() destroys any sensitive data held within the
EC_POINT and then frees its memory. If point is NULL nothing is done.
EC_POINT_copy() copies the point src into dst. Both src and dst must
use the same EC_METHOD.
EC_POINT_dup() creates a new EC_POINT object and copies the content
from src to the newly created EC_POINT object.
EC_POINT_method_of() obtains the EC_METHOD associated with point. This
function was deprecated in OpenSSL 3.0, since EC_METHOD is no longer a
public concept.
A valid point on a curve is the special point at infinity. A point is
set to be at infinity by calling EC_POINT_set_to_infinity().
The affine coordinates for a point describe a point in terms of its x
and y position. The function EC_POINT_set_affine_coordinates() sets the
x and y coordinates for the point p defined over the curve given in
group. The function EC_POINT_get_affine_coordinates() sets x and y,
either of which may be NULL, to the corresponding coordinates of p.
The functions EC_POINT_set_affine_coordinates_GFp() and
EC_POINT_set_affine_coordinates_GF2m() are synonyms for
EC_POINT_set_affine_coordinates(). They are defined for backwards
compatibility only and should not be used.
The functions EC_POINT_get_affine_coordinates_GFp() and
EC_POINT_get_affine_coordinates_GF2m() are synonyms for
EC_POINT_get_affine_coordinates(). They are defined for backwards
compatibility only and should not be used.
As well as the affine coordinates, a point can alternatively be
described in terms of its Jacobian projective coordinates (for Fp
curves only). Jacobian projective coordinates are expressed as three
values x, y and z. Working in this coordinate system provides more
efficient point multiplication operations. A mapping exists between
Jacobian projective coordinates and affine coordinates. A Jacobian
projective coordinate (x, y, z) can be written as an affine coordinate
as (x/(z^2), y/(z^3)). Conversion to Jacobian projective from affine
coordinates is simple. The coordinate (x, y) is mapped to (x, y, 1).
Although deprecated in OpenSSL 3.0 and should no longer be used, to set
or get the projective coordinates in older versions use
EC_POINT_set_Jprojective_coordinates_GFp() and
EC_POINT_get_Jprojective_coordinates_GFp() respectively. Modern
versions should instead use EC_POINT_set_affine_coordinates() and
EC_POINT_get_affine_coordinates(), performing the conversion manually
using the above maps in such rare circumstances.
Points can also be described in terms of their compressed coordinates.
For a point (x, y), for any given value for x such that the point is on
the curve there will only ever be two possible values for y. Therefore,
a point can be set using the EC_POINT_set_compressed_coordinates()
function where x is the x coordinate and y_bit is a value 0 or 1 to
identify which of the two possible values for y should be used.
The functions EC_POINT_set_compressed_coordinates_GFp() and
EC_POINT_set_compressed_coordinates_GF2m() are synonyms for
EC_POINT_set_compressed_coordinates(). They are defined for backwards
compatibility only and should not be used.
In addition EC_POINT can be converted to and from various external
representations. The octet form is the binary encoding of the ECPoint
structure (as defined in RFC5480 and used in certificates and TLS
records): only the content octets are present, the OCTET STRING tag and
length are not included. BIGNUM form is the octet form interpreted as a
big endian integer converted to a BIGNUM structure. Hexadecimal form is
the octet form converted to a NULL terminated character string where
each character is one of the printable values 0-9 or A-F (or a-f).
The functions EC_POINT_point2oct(), EC_POINT_oct2point(),
EC_POINT_point2bn(), EC_POINT_bn2point(), EC_POINT_point2hex() and
EC_POINT_hex2point() convert from and to EC_POINTs for the formats:
octet, BIGNUM and hexadecimal respectively.
The function EC_POINT_point2oct() encodes the given curve point p as an
octet string into the buffer buf of size len, using the specified
conversion form form. The encoding conforms with Sec. 2.3.3 of the
SECG SEC 1 ("Elliptic Curve Cryptography") standard. Similarly the
function EC_POINT_oct2point() decodes a curve point into p from the
octet string contained in the given buffer buf of size len, conforming
to Sec. 2.3.4 of the SECG SEC 1 ("Elliptic Curve Cryptography")
standard.
The functions EC_POINT_point2hex() and EC_POINT_point2bn() convert a
point p, respectively, to the hexadecimal or BIGNUM representation of
the same encoding of the function EC_POINT_point2oct(). Vice versa,
similarly to the function EC_POINT_oct2point(), the functions
EC_POINT_hex2point() and EC_POINT_point2bn() decode the hexadecimal or
BIGNUM representation into the EC_POINT p.
Notice that, according to the standard, the octet string encoding of
the point at infinity for a given curve is fixed to a single octet of
value zero and that, vice versa, a single octet of size zero is decoded
as the point at infinity.
The function EC_POINT_point2oct() 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 still return the required buffer
length.
The function EC_POINT_point2buf() allocates a buffer of suitable length
and writes an EC_POINT 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.
The function EC_POINT_point2hex() will allocate sufficient memory to
store the hexadecimal string. It is the caller's responsibility to free
this memory with a subsequent call to OPENSSL_free().
RETURN VALUES
EC_POINT_new(3) and EC_POINT_dup() return the newly allocated EC_POINT
or NULL on error.
The following functions return 1 on success or 0 on error:
EC_POINT_copy(), EC_POINT_set_to_infinity(),
EC_POINT_set_Jprojective_coordinates_GFp(),
EC_POINT_get_Jprojective_coordinates_GFp(),
EC_POINT_set_affine_coordinates_GFp(),
EC_POINT_get_affine_coordinates_GFp(),
EC_POINT_set_compressed_coordinates_GFp(),
EC_POINT_set_affine_coordinates_GF2m(),
EC_POINT_get_affine_coordinates_GF2m(),
EC_POINT_set_compressed_coordinates_GF2m() and EC_POINT_oct2point().
EC_POINT_method_of returns the EC_METHOD associated with the supplied
EC_POINT.
EC_POINT_point2oct() and EC_POINT_point2buf() return the length of the
required buffer or 0 on error.
EC_POINT_point2bn() returns the pointer to the BIGNUM supplied, or NULL
on error.
EC_POINT_bn2point() returns the pointer to the EC_POINT supplied, or
NULL on error.
EC_POINT_point2hex() returns a pointer to the hex string, or NULL on
error.
EC_POINT_hex2point() returns the pointer to the EC_POINT supplied, or
NULL on error.
SEE ALSO
crypto(7), EC_GROUP_new(3), EC_GROUP_copy(3), EC_POINT_add(3),
EC_KEY_new(3), EC_GFp_simple_method(3), d2i_ECPKParameters(3)
HISTORY
EC_POINT_method_of(), EC_POINT_set_Jprojective_coordinates_GFp(),
EC_POINT_get_Jprojective_coordinates_GFp(),
EC_POINT_set_affine_coordinates_GFp(),
EC_POINT_get_affine_coordinates_GFp(),
EC_POINT_set_compressed_coordinates_GFp(),
EC_POINT_set_affine_coordinates_GF2m(),
EC_POINT_get_affine_coordinates_GF2m(),
EC_POINT_set_compressed_coordinates_GF2m(), EC_POINT_point2bn(), and
EC_POINT_bn2point() were deprecated in OpenSSL 3.0.
EC_POINT_set_affine_coordinates, EC_POINT_get_affine_coordinates, and
EC_POINT_set_compressed_coordinates were added in OpenSSL 1.1.1.
COPYRIGHT
Copyright 2013-2023 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the Apache License 2.0 (the "License"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file LICENSE in the source distribution or at
<https://www.openssl.org/source/license.html>.
3.3.2 2024-09-04 EC_POINT_NEW(3ossl)
openssl 3.3.2 - Generated Tue Sep 10 13:50:35 CDT 2024