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Make fw_decrypt.py work for Lexmark LW Firmware versions #3

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Make fw_decrypt.py work for Lexmark LW Firmware versions #3

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18 changes: 13 additions & 5 deletions tools/fw_decrypt.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,8 @@
import os
import struct
import binascii
import re

from Crypto.Cipher import AES

DEFAULT_KEY_INDEX = 2
Expand Down Expand Up @@ -99,13 +101,16 @@ def parse_pjl_header(self):
a = self.fh.readline()
if a != b"\x1b%-12345X@PJL \n":
self.err("invalid header line")
pjl_line_a = self.fh.readline().decode("utf8")
pjl_line_b = self.fh.readline().decode("utf8")

if not pjl_line_a.startswith("@PJL") or not pjl_line_b.startswith("@PJL"):
self.err("invalid PJL header line")
while True:
pjl_line_a = self.fh.readline().decode("utf8")
if not pjl_line_a.startswith("@PJL"):
self.err("invalid PJL header line")
if pjl_line_a.startswith("@PJL LPROGRAMRIP"):
# Skip over one or many COMMENT.
break

parts = pjl_line_b.split(" ")
parts = pjl_line_a.split(" ")
if parts[1] != "LPROGRAMRIP":
self.err("unexpected pjl instruction '%s'" % parts[1])

Expand All @@ -115,6 +120,9 @@ def parse_pjl_header(self):
name, value = parts[i].split("=", 1)
if value.startswith('"'):
self.pjl_properties[name] = value[1 : len(value) - 1]
elif re.search(r'^[a-z][a-z0-9]+$', value, re.IGNORECASE):
# Parse: TYPE=MAIN
self.pjl_properties[name] = value
else:
self.pjl_properties[name] = int(value, 0)

Expand Down