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msm-code/paper.python.aff86e72b5462bf8d858196af5f88ea2

Created October 21, 2016 09:36
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paper.python.aff86e72b5462bf8d858196af5f88ea2
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paper.python.aff86e72b5462bf8d858196af5f88ea2
def nymaim_decrypt(key, raw_bytes):
nibble0 = raw_bytes[0] & 0xF
nibble1 = raw_bytes[1] & 0xF
salt = raw_bytes[2:2+nibble0]
password = key + salt
data = raw_bytes[2+nibble0:len(raw_bytes)-nibble1]
decrypted = rc4_decrypt(password, body)
decrypted_len = struct.unpack('<I', decrypted[:4])[0]
assert decrypted_len == len(decrypted - 4)
return decrypted
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