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rrooij/checksum.py

Created May 22, 2017 16:23
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Checksum Python
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checksum.py
def sum16_checksum(bytes, big=True):
sum = 0
count_to = len(bytes)
count = 0
while count_to > count:
value = bytes[count + 1] + bytes[count]
sum = sum + value
count = count + 2
if big:
sum = sum >> 8 | (sum << 8 & 0xff00) # Swap bytes for big endian
return sum
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