Implement vrf random hash in the keystore

Author: HoOngEe

Cargo.lock

@@ -19,6 +19,7 @@ parking_lot = "0.6.0"
 codechain-crypto = { git = "https://github.com/CodeChain-io/rust-codechain-crypto.git", version = "0.1" }
 smallvec = "0.4"
 tempdir = "0.3"
+vrf = { git = "https://github.com/CodeChain-io/vrf-rs.git" }
 
 [dev-dependencies]
 matches = "0.1"

keystore/Cargo.toml

@@ -17,6 +17,8 @@
 use ckey::{
     sign, sign_schnorr, Error as KeyError, KeyPair, Message, Private, Public, SchnorrSignature, Secret, Signature,
 };
+use vrf::openssl::{Error as VRFError, ECVRF};
+use vrf::VRF;
 
 /// An opaque wrapper for secret.
 pub struct DecryptedAccount {
@@ -40,6 +42,11 @@ impl DecryptedAccount {
         sign_schnorr(&Private::from(self.secret), message)
     }
 
+    ///  Generate VRF random hash output.
+    pub fn vrf_hash(&self, message: &Message, vrf_inst: &mut ECVRF) -> Result<Vec<u8>, VRFError> {
+        vrf_inst.prove(&Private::from(self.secret), message).and_then(|proof| vrf_inst.proof_to_hash(&proof))
+    }
+
     /// Derive public key.
     pub fn public(&self) -> Result<Public, KeyError> {
         Ok(*KeyPair::from_private(Private::from(self.secret))?.public())

keystore/src/account/decrypted_account.rs

@@ -41,6 +41,7 @@ extern crate serde_json;
 extern crate smallvec;
 extern crate tempdir;
 extern crate time;
+extern crate vrf;
 
 extern crate codechain_crypto as ccrypto;
 extern crate codechain_json as cjson;