EC_GFP_SIMPLE_METHOD - Online Linux Manual PageSection : 3
Updated : 2021-03-26
Source : 1.1.1k
Note : OpenSSL
NAMEEC_GFp_simple_method, EC_GFp_mont_method, EC_GFp_nist_method, EC_GFp_nistp224_method, EC_GFp_nistp256_method, EC_GFp_nistp521_method, EC_GF2m_simple_method, EC_METHOD_get_field_type − Functions for obtaining EC_METHOD objects
SYNOPSIS​ #include <openssl/ec.h> ​ ​ const EC_METHOD *EC_GFp_simple_method(void); ​ const EC_METHOD *EC_GFp_mont_method(void); ​ const EC_METHOD *EC_GFp_nist_method(void); ​ const EC_METHOD *EC_GFp_nistp224_method(void); ​ const EC_METHOD *EC_GFp_nistp256_method(void); ​ const EC_METHOD *EC_GFp_nistp521_method(void); ​ ​ const EC_METHOD *EC_GF2m_simple_method(void); ​ ​ int EC_METHOD_get_field_type(const EC_METHOD *meth);
DESCRIPTIONThe Elliptic Curve library provides a number of different implementations through a single common interface. When constructing a curve using EC_GROUP_new (see EC_GROUP_new (3)) an implementation method must be provided. The functions described here all return a const pointer to an ​EC_METHOD structure that can be passed to EC_GROUP_NEW. It is important that the correct implementation type for the form of curve selected is used. For F2^m curves there is only one implementation choice, i.e. EC_GF2_simple_method. For Fp curves the lowest common denominator implementation is the EC_GFp_simple_method implementation. All other implementations are based on this one. EC_GFp_mont_method builds on EC_GFp_simple_method but adds the use of montgomery multiplication (see BN_mod_mul_montgomery (3)). EC_GFp_nist_method offers an implementation optimised for use with NIST recommended curves (NIST curves are available through EC_GROUP_new_by_curve_name as described in EC_GROUP_new (3)). The functions EC_GFp_nistp224_method, EC_GFp_nistp256_method and EC_GFp_nistp521_method offer 64 bit optimised implementations for the NIST P224, P256 and P521 curves respectively. Note, however, that these implementations are not available on all platforms. EC_METHOD_get_field_type identifies what type of field the EC_METHOD structure supports, which will be either F2^m or Fp. If the field type is Fp then the value NID_X9_62_prime_field is returned. If the field type is F2^m then the value NID_X9_62_characteristic_two_field is returned. These values are defined in the obj_mac.h header file.
RETURN VALUESAll EC_GFp* functions and EC_GF2m_simple_method always return a const pointer to an EC_METHOD structure. EC_METHOD_get_field_type returns an integer that identifies the type of field the EC_METHOD structure supports.
SEE ALSO​crypto (7), EC_GROUP_new (3), EC_GROUP_copy (3), ​EC_POINT_new (3), EC_POINT_add (3), EC_KEY_new (3), ​d2i_ECPKParameters (3), ​BN_mod_mul_montgomery (3)
COPYRIGHTCopyright 2013−2017 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>. 0
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