I have been doing: <size_uint>:<rounds_uint>:<base64 of the bytearray>:<salt_uint> So, 100:10:AKiEIEQKALgRACEABA==:3 Means 100 bits, 10 rounds and the salt is 3 Then we can force in the event kind to always use MurMur3 for 32 bits (the best hash function).