gpgit.py is a Python wrapper for the GnuPG software, to
convert plaintext emails of any Content-Type into PGP-encrypted emails using
the PGP/MIME format, defined in RFC 3156.
It reads in a raw email file including headers from stdin and outputs the email
with rewritten headers in the multipart/encrypted MIME type and an encrypted
body. A public key file is passed in from the command line containing a valid
GnuPG public key used to encrypt the email. Already-encrypted emails are
detected and not re-encrypted.
Optionally, headers may also be encrypted under the Protected Headers for
Cryptographic
E-mail
Internet-Draft. This is disabled by default but maybe enabled using the -p
flag, which currently encrypts only the subject. As of now, only Thunderbird
78+ supports reading and displaying encrypted subject lines.
Python 3 is required.
./gpgit.py [-p] public_key