32 lines
780 B
Python
Executable File
32 lines
780 B
Python
Executable File
#!/usr/bin/env python3
|
|
import os
|
|
import sys
|
|
import struct
|
|
import hashlib
|
|
from Crypto.PublicKey import RSA
|
|
import binascii
|
|
|
|
rsa = RSA.importKey(open(sys.argv[3]).read())
|
|
|
|
with open(sys.argv[1], "rb") as f:
|
|
dat = f.read()
|
|
|
|
print("signing", len(dat), "bytes")
|
|
|
|
with open(sys.argv[2], "wb") as f:
|
|
if os.getenv("SETLEN") is not None:
|
|
x = struct.pack("I", len(dat)) + dat[4:]
|
|
# mock signature of dat[4:]
|
|
dd = hashlib.sha1(dat[4:]).digest()
|
|
else:
|
|
x = dat
|
|
dd = hashlib.sha1(dat).digest()
|
|
|
|
print("hash:", str(binascii.hexlify(dd), "utf-8"))
|
|
dd = b"\x00\x01" + b"\xff"*0x69 + b"\x00" + dd
|
|
rsa_out = pow(int.from_bytes(dd, byteorder='big', signed=False), rsa.d, rsa.n)
|
|
sig = (hex(rsa_out)[2:].rjust(0x100, '0'))
|
|
x += binascii.unhexlify(sig)
|
|
f.write(x)
|
|
|