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neuschaefer/mstar-decrypt.py

Last active April 20, 2025 16:09
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mstar-decrypt.py
#!/usr/bin/python3
# MStar firmware decryption tool
from Crypto.Cipher import AES
import sys
key = 4 * b'\x12\x34\x56\x78'
aes = AES.new(bytes(key), AES.MODE_ECB)
for filename in sys.argv[1:]:
with open(filename, 'rb') as f:
data = f.read()
dec = aes.decrypt(data[:(len(data)-16)&~0xf])
with open(filename + '.out', 'wb') as f:
f.write(dec)
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