Encryption, decryption and public key RPCs. (#1946)

* Fix up pending receipts details.

* Add support for additional params and registry over RPC.

* Fix tests.

* Add test, additional fix.

Fixes #1932.

* Fix up tests.

* Fix test.

* Fix test.

* Remove unused use.

* Add encryption, decryption and public-key RPCs.

* Remove &

ethstore/src/account/safe_account.rs

@@ -16,7 +16,7 @@
 
 use ethkey::{KeyPair, sign, Address, Secret, Signature, Message};
 use {json, Error, crypto};
-use crypto::Keccak256;
+use crypto::{Keccak256};
 use random::Random;
 use account::{Version, Cipher, Kdf, Aes128Ctr, Pbkdf2, Prf};
 
@@ -170,6 +170,11 @@ impl SafeAccount {
 		sign(&secret, message).map_err(From::from)
 	}
 
+	pub fn decrypt(&self, password: &str, shared_mac: &[u8], message: &[u8]) -> Result<Vec<u8>, Error> {
+		let secret = try!(self.crypto.secret(password));
+		crypto::ecies::decrypt(&secret, shared_mac, message).map_err(From::from)
+	}
+
 	pub fn change_password(&self, old_password: &str, new_password: &str, iterations: u32) -> Result<Self, Error> {
 		let secret = try!(self.crypto.secret(old_password));
 		let result = SafeAccount {

ethstore/src/error.rs

@@ -17,6 +17,7 @@
 use std::fmt;
 use std::io::Error as IoError;
 use ethkey::Error as EthKeyError;
+use crypto::Error as EthCryptoError;
 
 #[derive(Debug)]
 pub enum Error {
@@ -28,6 +29,7 @@ pub enum Error {
 	InvalidKeyFile(String),
 	CreationFailed,
 	EthKey(EthKeyError),
+	EthCrypto(EthCryptoError),
 	Custom(String),
 }
 
@@ -42,6 +44,7 @@ impl fmt::Display for Error {
 			Error::InvalidKeyFile(ref reason) => format!("Invalid key file: {}", reason),
 			Error::CreationFailed => "Account creation failed".into(),
 			Error::EthKey(ref err) => err.to_string(),
+			Error::EthCrypto(ref err) => err.to_string(),
 			Error::Custom(ref s) => s.clone(),
 		};
 
@@ -60,3 +63,9 @@ impl From<EthKeyError> for Error {
 		Error::EthKey(err)
 	}
 }
+
+impl From<EthCryptoError> for Error {
+	fn from(err: EthCryptoError) -> Self {
+		Error::EthCrypto(err)
+	}
+}

ethstore/src/ethstore.rs

@@ -144,6 +144,11 @@ impl SecretStore for EthStore {
 		account.sign(password, message)
 	}
 
+	fn decrypt(&self, account: &Address, password: &str, shared_mac: &[u8], message: &[u8]) -> Result<Vec<u8>, Error> {
+		let account = try!(self.get(account));
+		account.decrypt(password, shared_mac, message)
+	}
+
 	fn uuid(&self, address: &Address) -> Result<UUID, Error> {
 		let account = try!(self.get(address));
 		Ok(account.id.into())

ethstore/src/secret_store.rs

@@ -20,33 +20,24 @@ use json::UUID;
 
 pub trait SecretStore: Send + Sync {
 	fn insert_account(&self, secret: Secret, password: &str) -> Result<Address, Error>;
-
 	fn import_presale(&self, json: &[u8], password: &str) -> Result<Address, Error>;
-
 	fn import_wallet(&self, json: &[u8], password: &str) -> Result<Address, Error>;
-
-	fn accounts(&self) -> Result<Vec<Address>, Error>;
-
 	fn change_password(&self, account: &Address, old_password: &str, new_password: &str) -> Result<(), Error>;
-
 	fn remove_account(&self, account: &Address, password: &str) -> Result<(), Error>;
 
 	fn sign(&self, account: &Address, password: &str, message: &Message) -> Result<Signature, Error>;
+	fn decrypt(&self, account: &Address, password: &str, shared_mac: &[u8], message: &[u8]) -> Result<Vec<u8>, Error>;
 
+	fn accounts(&self) -> Result<Vec<Address>, Error>;
 	fn uuid(&self, account: &Address) -> Result<UUID, Error>;
-
 	fn name(&self, account: &Address) -> Result<String, Error>;
-
 	fn meta(&self, account: &Address) -> Result<String, Error>;
 
 	fn set_name(&self, address: &Address, name: String) -> Result<(), Error>;
-
 	fn set_meta(&self, address: &Address, meta: String) -> Result<(), Error>;
 
 	fn local_path(&self) -> String;
-
 	fn list_geth_accounts(&self, testnet: bool) -> Vec<Address>;
-
 	fn import_geth_accounts(&self, desired: Vec<Address>, testnet: bool) -> Result<Vec<Address>, Error>;
 }