Added deterministic keypair generation.

- The Account Manager has a new subcommand, allowing generation of deterministic keys given a particular validator index.
 - Split functionality in generate_deterministic_keypair function
 - Fixed up READMEs to reflect new functionality & correct naming.

account_manager/Cargo.toml

@@ -11,3 +11,4 @@ slog = "^2.2.3"
 slog-term = "^2.4.0"
 slog-async = "^2.3.0"
 validator_client = { path = "../validator_client" }
+types = { path = "../eth2/types" }

account_manager/README.md

@@ -1,6 +1,6 @@
-# Lighthouse Accounts Manager
+# Lighthouse Account Manager
 
-The accounts manager (AM) is a stand-alone binary which allows
+The account manager (AM) is a stand-alone binary which allows
 users to generate and manage the cryptographic keys necessary to
 interact with Ethereum Serenity.
 
@@ -21,4 +21,14 @@ staking on Ethereum 1.x (TPD)
 The AM is not a service, and does not run continuously, nor does it
 interact with any running services.
 It is intended to be executed separately from other Lighthouse binaries
-and produce files which can be consumed by them.
+and produce files which can be consumed by them.&
+
+## Usage
+
+Simply run `./account_manager generate` to generate a new random private key,
+which will be automatically saved to the correct directory.
+
+If you prefer to use our "deterministic" keys for testing purposes, simply
+run `./accounts_manager generate_deterministic -i <index>`, where `index` is
+the validator index for the key. This will reliably produce the same key each time
+and save it to the directory.

account_manager/src/main.rs

@@ -3,6 +3,7 @@ use clap::{App, Arg, SubCommand};
 use slog::{debug, info, o, Drain};
 use std::path::PathBuf;
 use validator_client::Config as ValidatorClientConfig;
+use types::test_utils::generate_deterministic_keypair;
 
 fn main() {
     // Logging
@@ -29,6 +30,21 @@ fn main() {
                 .version("0.0.1")
                 .author("Sigma Prime <contact@sigmaprime.io>"),
         )
+        .subcommand(
+            SubCommand::with_name("generate_deterministic")
+                .about("Generates a deterministic validator private key FOR TESTING")
+                .version("0.0.1")
+                .author("Sigma Prime <contact@sigmaprime.io>")
+                .arg(
+                    Arg::with_name("validator index")
+                        .long("index")
+                        .short("i")
+                        .value_name("index")
+                        .help("The index of the validator, for which the test key is generated")
+                        .takes_value(true)
+                        .required(true)
+                )
+        )
         .get_matches();
 
     let config = ValidatorClientConfig::parse_args(&matches, &log)
@@ -50,7 +66,24 @@ fn main() {
                 keypair.identifier(),
                 key_path.to_string_lossy()
             );
-        }
+        },
+        ("generate_deterministic", Some(gen_d_matches)) => {
+            let validator_index = gen_d_matches
+                .value_of("validator index")
+                .expect("Validator index required.")
+                .parse::<u64>()
+                .expect("Invalid validator index.") as usize;
+            let keypair = generate_deterministic_keypair(validator_index);
+            let key_path: PathBuf = config
+                .save_key(&keypair)
+                .expect("Unable to save newly generated deterministic private key.");
+            debug!(
+                log,
+                "Deterministic Keypair generated {:?}, saved to: {:?}",
+                keypair.identifier(),
+                key_path.to_string_lossy()
+            );
+        },
         _ => panic!(
             "The account manager must be run with a subcommand. See help for more information."
         ),