fix compilation for native

substrate/runtime-std/Cargo.toml

@@ -15,8 +15,7 @@ polkadot-state-machine = { path = "../state-machine", version = "0.1", optional
 polkadot-primitives = { path = "../primitives", version = "0.1", default_features = false }
 polkadot-runtime-codec = { path = "../runtime-codec", version = "0.1", default_features = false }
 triehash = { version = "0.1", optional = true }
-ring = { version = "0.12", optional = true }
-untrusted = { version = "0.5", optional = true }
+ed25519 = { path = "../ed25519", version = "0.1", optional = true }
 
 [features]
 default = ["std"]
@@ -26,8 +25,7 @@ std = [
 	"triehash",
 	"polkadot-primitives/std",
 	"polkadot-runtime-codec/std",
-	"ring",
-	"untrusted"
+	"ed25519",
 ]
 nightly = []
 strict = []

substrate/runtime-std/with_std.rs

@@ -20,8 +20,7 @@ extern crate environmental;
 extern crate polkadot_state_machine;
 extern crate polkadot_primitives as primitives;
 extern crate triehash;
-extern crate ring;
-extern crate untrusted;
+extern crate ed25519;
 
 pub use std::vec;
 pub use std::rc;
@@ -93,16 +92,7 @@ pub fn enumerated_trie_root(serialised_values: &[&[u8]]) -> [u8; 32] {
 
 /// Verify a ed25519 signature.
 pub fn ed25519_verify(sig: &[u8; 64], msg: &[u8], pubkey: &[u8; 32]) -> bool {
-	use ring::signature;
-
-	let public_key = untrusted::Input::from(pubkey);
-	let msg = untrusted::Input::from(msg);
-	let sig = untrusted::Input::from(sig);
-
-	match signature::verify(&signature::ED25519, public_key, msg, sig) {
-		Ok(_) => true,
-		_ => false,
-	}
+	ed25519::verify(sig, msg, pubkey)
 }
 
 /// Execute the given closure with global function available whose functionality routes into the