Introduce Ristretto signing (#1730)

* first draft of ristretto crypto module #1685

* adds better comments and code-style

* remove the last evil unwrap

* remove a mistakenly committed lockfile

* add a fresh new lockfile --will probably need a manual merge later

* fix an invalid old test vector

* Wire in ristretto

* Update comment

* Fix use.

* new Signature type api alias to be compatible with substrate

* Add new keyring, fix node executor tests

* Bump version.

* Remove all hashes.

* Update core/primitives/src/sr25519.rs

Co-Authored-By: gavofyork <github@gavwood.com>

* Revert back to Ed25519 (until JS UI is ready)

* Fix test

substrate/node/primitives/src/lib.rs

@@ -21,15 +21,19 @@
 #![cfg_attr(not(feature = "std"), no_std)]
 #![cfg_attr(not(feature = "std"), feature(alloc))]
 
-use runtime_primitives::generic;
-use runtime_primitives::{OpaqueExtrinsic, traits::BlakeTwo256};
+use runtime_primitives::{
+    generic, traits::{Verify, BlakeTwo256}, Ed25519Signature, OpaqueExtrinsic
+};
 
 /// An index to a block.
 pub type BlockNumber = u64;
 
-/// Alias to Ed25519 pubkey that identifies an account on the chain. This will almost
-/// certainly continue to be the same as the substrate's `AuthorityId`.
-pub type AccountId = ::primitives::H256;
+/// Alias to 512-bit hash when used in the context of a signature on the chain.
+pub type Signature = Ed25519Signature;
+
+/// Some way of identifying an account on the chain. We intentionally make it equivalent
+/// to the public key of our transaction signing scheme.
+pub type AccountId = <Signature as Verify>::Signer;
 
 /// The type for looking up accounts. We don't expect more than 4 billion of them, but you
 /// never know...
@@ -48,9 +52,6 @@ pub type Index = u64;
 /// A hash of some data used by the chain.
 pub type Hash = primitives::H256;
 
-/// Alias to 512-bit hash when used in the context of a signature on the chain.
-pub type Signature = runtime_primitives::Ed25519Signature;
-
 /// A timestamp: seconds since the unix epoch.
 pub type Timestamp = u64;