Validated this library against tssrp6a

[Xavier59]

Thank you for the library @adam-fowler ! :)

I wanted to let future users know that this module is compatible with tssrp6a as I have tested it today.
Note : It is necessary to use calculateSimpleClientProof. Do not use calculateClientProof or it won't work.

[adam-fowler]

cheers, did you mean you should use calculateClientProof?

[Xavier59]

Edited my post to correct this mistake

[Xavier59]

Also, the default identity calculation of tssrp6a does not contain the username, while this library does.
There is actually an issue & PR open on tssrp6a to add the username in identity so that it conforms better to srp 6a. However as of today, it is not yet the case.
Server side on tssrp6a, I had to add the following :

class SRP6aRoutines extends SRPRoutines {
    public computeIdentityHash(I: string, P: string): Promise<ArrayBuffer> {
        return this.hash(new TextEncoder().encode(`${I}:${P}`).buffer)
    }
}

In the README.md of swift-srp, SHA256 is used. tssrp6a default to SHA512. If you use this 2 libraries, make sure to have the same hashing algorithm set.