Feeds a chunk of data to the hash function.
public func update(_ buffer: Data) throws -> Void
This method feeds Buffer to the hash function. Call this methodrepeatedly to pass your data to the hash function chunk by chunk.
Remember to initialize the hash function with an Reset call beforestarting to feed data with this method. After the whole volume ofdata has been sent, complete the calculation and obtain the resultingmessage digest with a Finish call.