1 files changed, 43 insertions, 0 deletions
diff --git a/ffi/lang/python/examples/decrypt.py b/ffi/lang/python/examples/decrypt.py
new file mode 100644
index 00000000..c65f151d
--- /dev/null
+++ b/ffi/lang/python/examples/decrypt.py
@@ -0,0 +1,43 @@
+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("org.sequoia-pgp.examples",
+              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