cshake static method
implementation of SHAKE based on following KeccakNISTInterface.c from http://keccak.noekeon.org/
Implementation
static Uint8List cshake(Uint8List data,
{int bitLength = 256, Uint8List? N, Uint8List? S}) {
return CSHAKEDigest(bitLength, N, S).process(data);
}