const func bin64: crc64 (in string: stri)

Compute the CRC-64 cyclic redundancy check code.

crc64("123456789")  returns bin64(16#995dc9bbdf1939fa)

const func bin64: crc64 (in string: stri, in bin64: interimCrc)

Compute the CRC-64 cyclic redundancy check code with interimCrc. This function can be used to compute the CRC-64 with multiple steps:

interimCrc := crc64(data1);
interimCrc := crc64(data2, interimCrc);
finalCrc   := crc64(data3, interimCrc);