NAME

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

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>.