2019-12-14 20:08:34 +01:00
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import struct
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from random import randint
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2020-03-29 18:45:38 +02:00
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from ..helpers.checksumHelper import CheckSum
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from ..network.enums import types as TYPE
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2019-12-14 20:08:34 +01:00
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TEA_ROUNDS = 32
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TEA_XOR_MASK = 0x5E94A3CF
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KEY = []
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def EncryptBlock(v0, v1):
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sum = 0
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for i in range(TEA_ROUNDS):
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v0 += ((v1 << 4 ^ v1 >> 5) + v1) ^ (sum + key[sum & 3])
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def Encrypt(var_input): # bytes
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var_input_len = len(var_input) + TYPE.SIZEOF_CHAR * 2 # (checksum, encodedPad)
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paddingBytes = 0
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if var_input_len % 8 != 0:
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paddingBytes = 8 - (var_input_len % 8)
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finalLen = var_input_len + paddingBytes
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# Randomize pad size for some reason
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encodedPad = randint(0, TYPE.MAX_UCHAR)
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encodedPad <<= 4
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encodedPad &= 0xF0 # Remove bits lost from UCHAR size (C) [BYTE MAGIC]
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encodedPad |= paddingBytes
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var_output = [0] * finalLen #bytes(finalLen)
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var_output[2 + paddingBytes:] = [b for b in var_input]
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# Write the pad size variable
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var_output[1] = encodedPad
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# Write the padding
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var_output[2:2+len(paddingBytes)] = bytes([randint(0, TYPE.MAX_UCHAR) for _ in range(len(paddingBytes))])
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# Calculate checksum
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checksum = CheckSum()
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checksum.add(var_output[1:var_input_len + 1 + paddingBytes])
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var_checksum = checksum.get()
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var_checksum = (var_checksum << 4) ^ var_checksum
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var_checksum &= TYPE.MAX_UCHAR # [BYTE MAGIC]
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var_output[0] = var_checksum
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# Encryption
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for i in range(0, finalLen, 8):
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v0 = var_output[i]
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v1 = var_output[i + TYPE.SIZEOF_INT]
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return bytes(var_output)
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