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>.