41 lines
1.5 KiB
Python
41 lines
1.5 KiB
Python
#!/usr/bin/env python3
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import crcmod
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import sys
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from itertools import cycle
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from binascii import hexlify
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OBFUSCATION = [
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0x47, 0x22, 0xC0, 0x52, 0x5D, 0x57, 0x48, 0x94, 0xB1, 0x60, 0x60, 0xDB, 0x6F, 0xE3, 0x4C, 0x7C,
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0xD8, 0x4A, 0xD6, 0x8B, 0x30, 0xEC, 0x25, 0xE0, 0x4C, 0xD9, 0x00, 0x7F, 0xBF, 0xE3, 0x54, 0x05,
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0xE9, 0x3A, 0x97, 0x6B, 0xB0, 0x6E, 0x0C, 0xFB, 0xB1, 0x1A, 0xE2, 0xC9, 0xC1, 0x56, 0x47, 0xE9,
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0xBA, 0xF1, 0x42, 0xB6, 0x67, 0x5F, 0x0F, 0x96, 0xF7, 0xC9, 0x3C, 0x84, 0x1B, 0x26, 0xE1, 0x4E,
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0x3B, 0x6F, 0x66, 0xE6, 0xA0, 0x6A, 0xB0, 0xBF, 0xC6, 0xA5, 0x70, 0x3A, 0xBA, 0x18, 0x9E, 0x27,
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0x1A, 0x53, 0x5B, 0x71, 0xB1, 0x94, 0x1E, 0x18, 0xF2, 0xD6, 0x81, 0x02, 0x22, 0xFD, 0x5A, 0x28,
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0x91, 0xDB, 0xBA, 0x5D, 0x64, 0xC6, 0xFE, 0x86, 0x83, 0x9C, 0x50, 0x1C, 0x73, 0x03, 0x11, 0xD6,
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0xAF, 0x30, 0xF4, 0x2C, 0x77, 0xB2, 0x7D, 0xBB, 0x3F, 0x29, 0x28, 0x57, 0x22, 0xD6, 0x92, 0x8B,
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]
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def obfuscate(fw):
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return bytes([a^b for a, b in zip(fw, cycle(OBFUSCATION))])
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plain = open(sys.argv[1], 'rb').read()
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if len(sys.argv[2]) > 10:
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print('Version suffix is too big!')
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sys.exit(1)
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version = b'*OEFW-' + bytes(sys.argv[2], 'ascii')
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if len(version) < 16:
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version += b'\x00' * (16 - len(version))
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packed = obfuscate(plain[:0x2000] + version + plain[0x2000:])
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crc = crcmod.predefined.Crc('xmodem')
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crc.update(packed)
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digest = crc.digest()
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digest = bytes([digest[1], digest[0]])
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open(sys.argv[3], 'wb').write(packed + digest)
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