* Use the sha2 crate in the handshake
* Return a Digest in algo_support instead of a ring ref
* Switch to ed25519-dalek for keys
* Make ring more or less optional
* Switch to ed25519_dalek for the verification
* Extract the key exchange to its own module
* Remove the ring RNG from the handshake
* Some warning fixes and forgot file
* Move key exchange to own module
* Remove usage of ring::digest
* Remove ring from handshake entirely
* Implement ECDH for WebCrypto
* Remove the libp2p-secio feature
* Fix ring being included
* Address some concerns
* Provde some panics in WebCrypto
* Prove the Hmac panic
* Prove more panics
* Introduce NULL cipher and allow more configuration.
* Back to using the hash-code for handshake.
Using `Endpoint` would be incompatible with the existing protocol.
* Add comments.
