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+=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