=pod

=head1 NAME

EVP_KDF-X942-CONCAT - The X942 Concat EVP_KDF implementation

=head1 DESCRIPTION

The EVP_KDF-X942-CONCAT algorithm is identical to EVP_KDF-X963. It is
used for key agreement to derive a key using input such as a shared secret key
and shared info.

=head2 Identity

"X942KDF_CONCAT" is the name for this implementation; it
can be used with the EVP_KDF_fetch() function.

This is an alias for "X963KDF".

See L<EVP_KDF-X963(7)> for a list of supported parameters and examples.

=head1 HISTORY

This functionality was added in OpenSSL 3.0.

=head1 COPYRIGHT

Copyright 2020-2021 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
L<https://www.openssl.org/source/license.html>.

=cut