Please extract information from OpenPGP keys and signatures

This bug was originally reported by Paul Wise (pabs@debian.org) in Debian bug #908994:

When comparing OpenPGP keys or signatures (binary and ASCII-armoured),
either as raw files or embedded in other formats (like .dsc files),
it would be nice to compare the internal data of those keys and sigs.

There are some different ways to output textual data from these formats:

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