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https://github.com/Lekensteyn/lglaf.git
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34 lines
998 B
Python
34 lines
998 B
Python
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from Crypto.Cipher import AES
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from lglaf import int_as_byte
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def key_transform(old_key):
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new_key = b''
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for x in range(32, 0, -1):
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new_key += int_as_byte(old_key[x-1] - (x % 0x0C))
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return new_key
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def xor_key(key, kilo_challenge):
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# Reserve key
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key_xor = b''
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pos = 0
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for i in range(8):
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key_xor += int_as_byte(key[pos] ^ kilo_challenge[3])
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key_xor += int_as_byte(key[pos + 1] ^ kilo_challenge[2])
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key_xor += int_as_byte(key[pos + 2] ^ kilo_challenge[1])
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key_xor += int_as_byte(key[pos + 3] ^ kilo_challenge[0])
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pos += 4
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return key_xor
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def encrypt_kilo_challenge(encryption_key, kilo_challenge):
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plaintext = b''
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for k in range(0, 16):
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# Assemble 0x00 0x01 0x02 ... 0x1F byte-array
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plaintext += int_as_byte(k)
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encryption_key = key_transform(encryption_key)
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xored_key = xor_key(encryption_key, kilo_challenge)
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obj = AES.new(xored_key, AES.MODE_ECB)
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return obj.encrypt(plaintext)
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