Automatically changing/removing key passphrase: python-pgp_passtool

[Bjarni Runar Einarsson]

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Hello again!

Since GnuPG appears to be designed not to handle this use-case, I
wrote a tool (a Python 2/3 library) to solve my problem:

    https://github.com/BjarniRunar/python-pgp_passtool

It's also in PyPI, so `pip install pgp_passtool` should work.

To sum up: this is a tool for changing the passphrase on a secret
key, or removing the passphrase entirely. It can be used from the
shell, or from within Python code.

It is my hope that this will help folks like myself who need a
level of automation, but don't want just use unprotected keys all
the time.

The tool has some support for coping with unusual character
encodings, and also allows the user to specify they want fast
(insecure) key derivation, for when we know the passphrase is
already very strong.

It's not a complete implementation, it's not well tested. There
are probably many keys out there which it cannot handle. So, I
very much welcome comments and bug reports and pull requests,
either here or in the issue tracker.

Cheers,
 - Bjarni

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