How to use a hash of descriptor instead of a raw descriptor?

[andrii-korotkov-verkada]

Hello,
I hope your day is going well.
There's a use case of rate limiting per auth token (stored in a header), which effectively means rate limit per caller. However, it's not desired to store a raw token in Redis as a part of a key. What's the best way to get a hashed value of the auth token to be used as a descriptor?
Thanks.

[jespersoderlund]

How about creating the hash in a lua-script in your envoy config and put it into a dynamic variable and use that to ratelimit on?