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import sys
import os
from getpass import getpass
from enum import Enum, auto
from sequoia.core import Context, NetworkPolicy
from sequoia.openpgp import Tag, PacketParser
ctx = Context(network_policy=NetworkPolicy.Offline,
ephemeral=True)
class State(Enum):
Start = auto()
Decrypted = auto()
Deciphered = auto()
Done = auto()
state = State.Start
algo, key = None, None
pp = PacketParser.open(ctx, sys.argv[1])
while pp.has_packet:
packet = pp.packet
tag = packet.tag
if state == State.Start:
if tag == Tag.SKESK:
passphrase = getpass("Enter passphrase to decrypt message: ")
algo, key = packet.match().decrypt(passphrase.encode())
state = State.Decrypted
elif tag == Tag.PKESK:
sys.stderr.write("Decryption using PKESK not yet supported.\n")
elif state == State.Decrypted:
if tag == Tag.SEIP:
pp.decrypt(algo, key)
state = State.Deciphered
elif state == State.Deciphered:
if tag == Tag.Literal:
body = pp.buffer_unread_content()
os.write(sys.stdout.fileno(), body)
state = State.Done
pp.recurse()
assert state == State.Done
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