Implement Wallet (#469)

* initial wallet implementation

* implemented wallet except generating new private key

* license

* implemented private key generation and refactor

* reformatting code according to comments on pr

* changed keystore to be a trait and refactored

* cargo clippy

* fixed issues using rust stable 1.44

* fixed issues rust 1.44 issues

* added wallet tests

* added changes

* Update key_management/src/keystore.rs

Co-authored-by: Austin Abell <austinabell8@gmail.com>

Co-authored-by: Austin Abell <austinabell8@gmail.com>

Cargo.toml

@@ -34,4 +34,5 @@ members = [
     "utils/commcid",
     "utils/json_utils",
     "types",
+    "key_management",
 ]

key_management/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "key_management"
+version = "0.1.0"
+authors = ["ChainSafe Systems <info@chainsafe.io>"]
+edition = "2018"
+
+[dependencies]
+thiserror = "1.0"
+address = { package = "forest_address", path = "../vm/address", version = "0.2" }
+crypto = { package = "forest_crypto", path = "../crypto" }
+bls-signatures = "0.6.0"
+libsecp256k1 = "0.3.4"
+rand = "0.7.3"

key_management/src/errors.rs

@@ -0,0 +1,22 @@
+// Copyright 2020 ChainSafe Systems
+// SPDX-License-Identifier: Apache-2.0, MIT
+
+use thiserror::Error;
+
+#[derive(Debug, PartialEq, Error)]
+pub enum Error {
+    /// info that corresponds to key does not exist
+    #[error("Key info not found")]
+    KeyInfo,
+    /// Key already exists in keystore
+    #[error("Key already exists")]
+    KeyExists,
+    #[error("Key does not exist")]
+    KeyNotExists,
+    #[error("Key not found")]
+    NoKey,
+    #[error("{0}")]
+    Other(String),
+    #[error("Could not convert from KeyInfo to Key")]
+    KeyInfoConversion,
+}

key_management/src/keystore.rs

@@ -0,0 +1,83 @@
+// Copyright 2020 ChainSafe Systems
+// SPDX-License-Identifier: Apache-2.0, MIT
+
+use super::errors::Error;
+use crypto::SignatureType;
+use std::collections::HashMap;
+
+/// KeyInfo struct, this contains the type of key (stored as a string) and the private key.
+/// note how the private key is stored as a byte vector
+#[derive(Clone, PartialEq, Debug, Eq)]
+pub struct KeyInfo {
+    key_type: SignatureType,
+    // Vec<u8> is used because The private keys for BLS and SECP256K1 are not of the same type
+    private_key: Vec<u8>,
+}
+
+impl KeyInfo {
+    /// Return a new KeyInfo given the key_type and private_key
+    pub fn new(key_type: SignatureType, private_key: Vec<u8>) -> Self {
+        KeyInfo {
+            key_type,
+            private_key,
+        }
+    }
+
+    /// Return a clone of the key_type
+    pub fn key_type(&self) -> &SignatureType {
+        &self.key_type
+    }
+
+    /// Return a clone of the private_key
+    pub fn private_key(&self) -> &Vec<u8> {
+        &self.private_key
+    }
+}
+
+/// KeyStore struct, this contains a HashMap that is a set of KeyInfos resolved by their Address
+pub trait KeyStore {
+    /// Return all of the keys that are stored in the KeyStore
+    fn list(&self) -> Vec<String>;
+    /// Return Keyinfo that corresponds to a given key
+    fn get(&self, k: &str) -> Result<KeyInfo, Error>;
+    /// Save a key key_info pair to the KeyStore
+    fn put(&mut self, key: String, key_info: KeyInfo) -> Result<(), Error>;
+    /// Remove the Key and corresponding key_info from the KeyStore
+    fn remove(&mut self, key: String) -> Option<KeyInfo>;
+}
+
+#[derive(Default, Clone, PartialEq, Debug, Eq)]
+pub struct MemKeyStore {
+    pub key_info: HashMap<String, KeyInfo>,
+}
+
+impl MemKeyStore {
+    /// Return a new empty KeyStore
+    pub fn new() -> Self {
+        MemKeyStore {
+            key_info: HashMap::new(),
+        }
+    }
+}
+
+impl KeyStore for MemKeyStore {
+    fn list(&self) -> Vec<String> {
+        self.key_info.iter().map(|(key, _)| key.clone()).collect()
+    }
+
+    fn get(&self, k: &str) -> Result<KeyInfo, Error> {
+        self.key_info.get(k).cloned().ok_or(Error::KeyInfo)
+    }
+
+    fn put(&mut self, key: String, key_info: KeyInfo) -> Result<(), Error> {
+        if self.key_info.contains_key(&key) {
+            return Err(Error::KeyExists);
+        }
+        self.key_info.insert(key, key_info);
+        Ok(())
+    }
+
+    fn remove(&mut self, key: String) -> Option<KeyInfo> {
+        self.key_info.remove(&key)
+    }
+}

key_management/src/lib.rs

@@ -0,0 +1,12 @@
+// Copyright 2020 ChainSafe Systems
+// SPDX-License-Identifier: Apache-2.0, MIT
+
+mod errors;
+mod keystore;
+mod wallet;
+mod wallet_helpers;
+
+pub use errors::*;
+pub use keystore::*;
+pub use wallet::*;
+pub use wallet_helpers::*;