How to detect extraneous content in clearsigned (--clearsign) files?

[Patrick Schleizer]

Hi!

Suppose a file has been `--clearsign`ed. Then an adversary pretended or
appended extraneous content.

How can such a situation be detected? Any gpg built in way or would one
have to use a third party solution or invent one?

Perhaps code talks more:
https://gist.github.com/adrelanos/defdf9d693c2726514fd

Cheers,
Patrick