Module challenge 

The server side of digest authentication (RFC 7616, RFC 8760).

crate::auth answers a challenge. This issues one, and checks what comes back — the same formulas from the other end, which is why they are not written a second time here.

Scope is the primitives. Which credential a username maps to, and what to do about a failure, belong to whoever is authenticating: a credential store is not this crate’s business. So verification takes the password as an argument and returns a verdict, and the caller decides everything around it.

Structs

Authenticator

A server that issues digest challenges and checks the answers.

Presented

What a request presented in its Authorization or Proxy-Authorization.

Enums

Reason

Why verification failed.

Verdict

What verification concluded.

Constants

DEFAULT_LIFETIME

How long a nonce is good for by default.