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Change --null-sigs to --fakesign and add fakesigning code

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This commit is contained in:
Campbell 2024-07-10 20:50:45 +10:00
parent 475f82aa18
commit 09631d509e
Signed by: NinjaCheetah
GPG Key ID: 670C282B3291D63D
2 changed files with 26 additions and 4 deletions
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28
modules/wad.py
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@ -3,6 +3,7 @@
import os
import pathlib
import hashlib
import binascii
import libWiiPy
@ -70,10 +71,31 @@ def handle_wad(args):
# Method to ensure that the title's content records match between the TMD() and ContentRegion() objects.
title.load_content_records()
# Nullify TMD/Ticket signatures here if the argument was passed.
if args.null_sigs:
title.tmd.signature = b'\x00' * 256
# Fakesign the TMD and Ticket using the trucha bug, if enabled.
# This is done by changing an unused portion of both the TMD and Ticket, and then calculating the SHA-1 hash
# of the TMD/Ticket without the signature, and seeing if it begins with a null byte.
if args.fakesign:
tmd = title.tmd
tmd.signature = b'\x00' * 256
current_int = 0
test_hash = 'gggggggggggggggggggggggggggggggggggggggg'
while test_hash[:2] != '00':
current_int += 1
tmd.minor_version = current_int
test_hash = hashlib.sha1(tmd.dump()[320:]).hexdigest()
title.tmd = tmd
ticket = title.ticket
title.ticket.signature = b'\x00' * 256
current_int = 0
test_hash = 'gggggggggggggggggggggggggggggggggggggggg'
while test_hash[:2] != '00':
current_int += 1
data_to_edit = ticket.unknown2
data_to_edit = int.to_bytes(current_int, 2) + data_to_edit[:2]
ticket.unknown2 = data_to_edit
test_hash = hashlib.sha1(ticket.dump()[320:]).hexdigest()
title.ticket = ticket
# Iterate over every file in the content_files list, and attempt to load it into the Title().
for index in range(len(title.content.content_records)):

2
wiipy.py
View File

@ -26,7 +26,7 @@ if __name__ == "__main__":
wad_group.add_argument("-u", "--unpack", help="unpack a WAD file to a directory", action="store_true")
wad_parser.add_argument("input", metavar="IN", type=str, help="input file")
wad_parser.add_argument("output", metavar="OUT", type=str, help="output file")
wad_parser.add_argument("--null-sigs", help="nullify signatures in the TMD and Ticket (packing only)",
wad_parser.add_argument("--fakesign", help="fakesign the TMD and Ticket (trucha bug)",
action="store_true")
# Argument parser for the NUS subcommand.