Question

Obviously the wildcard %x is not recognized as a byte hex value, so I get the error “ValueError: invalid \x escape”.

How to avoid this? I’m not familiar with python.

for i in xrange(0,length):

  if i % 2 == 0:

    tempArray.append(unpack("B",payload_raw[x])[0]^key)
    x += 1

  else:

    randomByte = random.randint(65,90)
    tempArray.append(randomByte)

    for i in range(0,len(tempArray)):

      tempArray[i]="\x%x"%tempArray[i]

    for i in range(0,len(tempArray),15):

      outArray.append("\n'"+"".join(tempArray[i:i+15])+"'")
      outArray = "".join(outArray)
      devide = "i % 2;"
      open_structure = open(structure).read()
      code = open_structure % (junkA,outArray,junkB,key,length,devide)
      b.write(code)
      b.flush()

Answer 1

chr() will give you the bytestring for a value between 0 and 255.

>>> chr(0xd3)
'\xd3'