[lhazlewood]

Stormpath's custom scheme is very similar to Amazon's.

But per the blog article, you'd only want to do this if you are willing to support client libraries/sdks that implement it as well. No one wants to spend the time to implement non-standard custom HMAC algorithms.

[knkella]

We tried this with Pagify http://pagify.io And I think supporting client libraries was not an issue, since we had to provide SDK one way or the other.

[lhazlewood]

Totally agree. The key here is that you're doing the work to implement the algorithms, not your customers. If they had to do it, they probably just wouldn't use it.