Add padding

PyCryptodome does not seem to support ciphertext stealing

munge.py

@@ -1,4 +1,5 @@
 from Crypto.Cipher import AES
+from Crypto.Util.Padding import pad, unpad
 from authorizedkeys.parser import parse_file, dump_file, AuthorizedKey
 import sys
 from base64 import b64decode, b64encode
@@ -23,7 +24,7 @@ keys = parse_file(input)
 for k in keys:
 	if isinstance(k, AuthorizedKey):
 		if encrypt:
-			k.comment = b64encode(cipher.encrypt(k.comment.encode())).decode()
+			k.comment = b64encode(cipher.encrypt(pad(k.comment.encode(), cipher.block_size))).decode()
 		else: # And now this is just wow.
-			k.comment = cipher.decrypt(b64decode(k.comment)).decode()
+			k.comment = unpad(cipher.decrypt(b64decode(k.comment)), cipher.block_size).decode()
 dump_file(keys, output)