+=attr header_hash
+
+ $octets = $dumper->header_hash;
+
+Get the value to be written as the B<HeaderHash> in the B<Meta> section. This is the way KDBX3 files validate
+the authenticity of header data. This is unnecessary and should not be used with KDBX4 files because that
+format uses HMAC-SHA256 to detect tampering.
+
+L<File::KDBX::Dumper::V3> automatically calculates the header hash an provides it to this module, and plain
+XML files which don't have a KDBX wrapper don't have headers and so should have a header hash. Therefore there
+is probably never any reason to set this manually.
+
+=cut
+