HpcTraceDecrypt.py

import sys

fin = open(sys.argv[1], 'rb')
fout = open(sys.argv[1] + '.decrypted', 'wb')

fin.seek(256)
dataEnc = fin.read()
key = -1

for b in range(0, 256):
    dataDec = ''
    seed = 0
    for ch in dataEnc:
        dataDec += chr((b ^ ord(ch)) ^ seed)
        seed = ord(ch)
        if len(dataDec) > 500:
            break
    if dataDec.find("Trace started") > 0:
        key = b
        break

if key >= 0:
    print "The key is: {}".format(key)
    dataDec = bytearray(len(dataEnc))
    seed = 0
    for ch in range(0, len(dataEnc)):
        dataDec[ch] = chr((key ^ ord(dataEnc[ch])) ^ seed)
        seed = ord(dataEnc[ch])
    fout.write(dataDec)
else:
    print "The key can not be found!"