Merge pull request #798 from ethcore/eth_rpc

another batch of rpc improvements

util/src/crypto.rs

@@ -20,6 +20,7 @@ use numbers::*;
 use bytes::*;
 use secp256k1::{key, Secp256k1};
 use rand::os::OsRng;
+use sha3::Hashable;
 
 /// Secret key for secp256k1 EC operations. 256 bit generic "hash" data.
 pub type Secret = H256;
@@ -135,15 +136,22 @@ impl KeyPair {
 			public: p,
 		})
 	}
+
 	/// Returns public key
 	pub fn public(&self) -> &Public {
 		&self.public
 	}
+
 	/// Returns private key
 	pub fn secret(&self) -> &Secret {
 		&self.secret
 	}
 
+	/// Returns address.
+	pub fn address(&self) -> Address {
+		Address::from(self.public.sha3())
+	}
+
 	/// Sign a message with our secret key.
 	pub fn sign(&self, message: &H256) -> Result<Signature, CryptoError> { ec::sign(&self.secret, message) }
 }