python-pgp_passtool: OpenPGP Passphrase Tool

This is a library and a CLI tool for manipulating the passphrase and secret key encryption of a RFC4880 OpenPGP Transferable Private Key.

Dependencies

You will need:

• Python 2.7 or 3.x (not sure which 3.x)
• python-pgpdump
• cryptography

Shell examples:

# Get some instructions
$ python -m pgp_passtool
...

# Interactive passphrase changing
$ python -m pgp_passtool key.pgp new-key.pgp  # Prompts for passphrases
...

# Pipeline: strip the passphrase and ask GnuPG to parse the result
$ (echo "my old passphrase"; echo; cat key.pgp) \
    python -m pgp_passtool - \
    gpg --list-packets
...

Code example:

from pgp_passtool import change_passphrase

new_key_binary = change_passphrase(old_key_binary, old_pw, new_pw)