| A simple utility class that directly signs a public key and writes the signed key to "SignedKey.asc" in
the current working directory.
To sign a key: DirectKeySignature secretKeyFile secretKeyPass publicKeyFile(key to be signed) NotationName NotationValue.
To display a NotationData packet from a publicKey previously signed: DirectKeySignature signedPublicKeyFile.
Note: this example will silently overwrite files, nor does it pay any attention to
the specification of "_CONSOLE" in the filename. It also expects that a single pass phrase
will have been used.
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