CRC16/ARC Python implementation

crc16_arc.py

def crc16(data, offset, length):
    if data is None or offset < 0 or offset > len(data) - 1 and offset+length > len(data):
        return 0
    crc = 0x0000
    for i in (range(0, length)):
        # crc = crc << 8
        crc ^= data[i]
        # print(hex(data[i]))
        print(bin(crc))
        for j in range(0, 8):
            if (crc & 0x0001) > 0:
                crc = (crc >> 1) ^ 0xA001
            else:
                crc = crc >> 1

    
    print(bin(crc))
    # print(bin(0xFFFF))
    return crc


if __name__ == "__main__":

    print(hex(crc16("otto".encode(), 0 ,4       )))