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Implementation of crc16 (CRC-16-CCITT) in python
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def crc16(data: bytes, poly=0x8408): | |
''' | |
CRC-16-CCITT Algorithm | |
''' | |
data = bytearray(data) | |
crc = 0xFFFF | |
for b in data: | |
cur_byte = 0xFF & b | |
for _ in range(0, 8): | |
if (crc & 0x0001) ^ (cur_byte & 0x0001): | |
crc = (crc >> 1) ^ poly | |
else: | |
crc >>= 1 | |
cur_byte >>= 1 | |
crc = (~crc & 0xFFFF) | |
crc = (crc << 8) | ((crc >> 8) & 0xFF) | |
return crc & 0xFFFF |
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@pragma31 if I have a payload like this : " 623e0200000000000000000000000000" where 623e is crc given by a software i want to verify it , so what should i pass to get this value to the function that you have written here crc16 , thanks
same if i want to use https://crccalc.com/