def add_hex_mod(hexstr1, hexstr2): pt = str.split(hexstr1) sk = str.split(hexstr2) for x in range(0, len(pt)): hex1 = '0x' + pt[x] hex2 = '0x' + sk[x] # convert them to integers, add them, and modulo the answer by 2^64 to get it back into a 16 char hex print hex((int(hex1, 16) + int(hex2, 16)) % (2 ** 64)) # first param is the plaintext, separated by spaces into 64 bit chunks # second param is the subkey, separated by spaces into 64 bit chunks add_hex_mod('9f775a65c0e3811c c8bca15acf7a08ae 6e754a871451004c 35de95360e00810f', '0df6f4748765b209 dacbad80a1da643c 4d13bd990627c2ea 37ad1891e93add66')
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