On top of hash functions https://help.qlik.com/en-US/cloud-services/Subsystems/Hub/Content/Sense_Hub/Scripting/StringFunction...
would be useful some implementation of Hash-based Message Authentication Code (HMAC).
Some API´s (like https://docs.aws.amazon.com/general/latest/gr/signature-v4-examples.html#signature-v4-examples-pytho...) requires hmac codes to authenticate the API.
This is impossible to achieve currently using pure Qlik functions.
The only workaround currently is call one external REST API to make the calculations