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EVP_PKEY_get_field_type(3)          OpenSSL         EVP_PKEY_get_field_type(3)



NAME
       EVP_PKEY_get_field_type, EVP_PKEY_get_ec_point_conv_form - get field
       type or point conversion form of a key

LIBRARY
       libcrypto, -lcrypto

SYNOPSIS
        #include <openssl/evp.h>

        int EVP_PKEY_get_field_type(const EVP_PKEY *pkey);
        int EVP_PKEY_get_ec_point_conv_form(const EVP_PKEY *pkey);

DESCRIPTION
       EVP_PKEY_get_field_type() returns the field type NID of the pkey, if
       pkey's key type supports it. The types currently supported by the
       built-in OpenSSL providers are either NID_X9_62_prime_field for prime
       curves or NID_X9_62_characteristic_two_field for binary curves; these
       values are defined in the <openssl/obj_mac.h> header file.

       EVP_PKEY_get_ec_point_conv_form() returns the point conversion format
       of the pkey, if pkey's key type supports it.

NOTES
       Among the standard OpenSSL key types, this is only supported for EC and
       SM2 keys.  Other providers may support this for additional key types.

RETURN VALUES
       EVP_PKEY_get_field_type() returns the field type NID or 0 on error.

       EVP_PKEY_get_ec_point_conv_form() returns the point conversion format
       number (see EC_GROUP_copy(3)) or 0 on error.

SEE ALSO
       EC_GROUP_copy(3)

HISTORY
       These functions were added in OpenSSL 3.0.

COPYRIGHT
       Copyright 2021 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>.



3.0.12                            2023-05-07        EVP_PKEY_get_field_type(3)