Add signature module

Because things other than transactions can be signed.

src/accountant.rs

@@ -4,7 +4,8 @@
 
 use log::{Entry, Sha256Hash};
 use event::Event;
-use transaction::{get_pubkey, sign_transaction_data, PublicKey, Signature, Transaction};
+use transaction::{sign_transaction_data, Transaction};
+use signature::{get_pubkey, PublicKey, Signature};
 use genesis::Genesis;
 use historian::{reserve_signature, Historian};
 use ring::signature::Ed25519KeyPair;
@@ -157,7 +158,7 @@ impl Accountant {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use transaction::{generate_keypair, get_pubkey};
+    use signature::{generate_keypair, get_pubkey};
     use logger::ExitReason;
     use genesis::Creator;
 

src/accountant_skel.rs

@@ -1,6 +1,7 @@
 use std::io;
 use accountant::Accountant;
-use transaction::{PublicKey, Transaction};
+use transaction::Transaction;
+use signature::PublicKey;
 use log::{Entry, Sha256Hash};
 use std::net::UdpSocket;
 use bincode::{deserialize, serialize};

src/accountant_stub.rs

@@ -5,7 +5,8 @@
 use std::net::UdpSocket;
 use std::io;
 use bincode::{deserialize, serialize};
-use transaction::{get_pubkey, sign_transaction_data, PublicKey, Signature, Transaction};
+use transaction::{sign_transaction_data, Transaction};
+use signature::{get_pubkey, PublicKey, Signature};
 use log::{Entry, Sha256Hash};
 use ring::signature::Ed25519KeyPair;
 use accountant_skel::{Request, Response};

src/bin/client-demo.rs

@@ -3,7 +3,8 @@ extern crate silk;
 
 use silk::accountant_stub::AccountantStub;
 use silk::event::Event;
-use silk::transaction::{generate_keypair, get_pubkey, sign_transaction_data, Transaction};
+use silk::signature::{generate_keypair, get_pubkey};
+use silk::transaction::{sign_transaction_data, Transaction};
 use silk::genesis::Genesis;
 use std::time::Instant;
 use std::net::UdpSocket;

src/bin/demo.rs

@@ -2,7 +2,8 @@ extern crate silk;
 
 use silk::historian::Historian;
 use silk::log::{verify_slice, Entry, Sha256Hash};
-use silk::transaction::{generate_keypair, get_pubkey, sign_claim_data};
+use silk::signature::{generate_keypair, get_pubkey};
+use silk::transaction::sign_claim_data;
 use silk::event::Event;
 use std::thread::sleep;
 use std::time::Duration;

src/bin/genesis-file-demo.rs

@@ -2,7 +2,7 @@ extern crate serde_json;
 extern crate silk;
 
 use silk::genesis::{Creator, Genesis};
-use silk::transaction::{generate_keypair, get_pubkey};
+use silk::signature::{generate_keypair, get_pubkey};
 
 fn main() {
     let alice = Creator {

src/event.rs

@@ -1,6 +1,7 @@
 //! The `event` crate provides the data structures for log events.
 
-use transaction::{PublicKey, Signature, Transaction};
+use signature::{PublicKey, Signature};
+use transaction::Transaction;
 use serde::Serialize;
 use log::Sha256Hash;
 

src/genesis.rs

@@ -1,7 +1,8 @@
 //! A library for generating the chain's genesis block.
 
 use event::Event;
-use transaction::{generate_keypair, get_pubkey, sign_transaction_data, PublicKey, Transaction};
+use transaction::{sign_transaction_data, Transaction};
+use signature::{generate_keypair, get_pubkey, PublicKey};
 use log::{create_entries, hash, Entry, Sha256Hash};
 use ring::rand::SystemRandom;
 use ring::signature::Ed25519KeyPair;

src/historian.rs

@@ -7,7 +7,7 @@ use std::sync::mpsc::{sync_channel, Receiver, SyncSender};
 use std::time::Instant;
 use log::{hash, Entry, Sha256Hash};
 use logger::{ExitReason, Logger};
-use transaction::Signature;
+use signature::Signature;
 use event::Event;
 use serde::Serialize;
 use std::fmt::Debug;
@@ -70,6 +70,7 @@ mod tests {
     use log::*;
     use event::*;
     use transaction::*;
+    use signature::*;
     use std::thread::sleep;
     use std::time::Duration;
 

src/lib.rs

@@ -3,6 +3,7 @@ pub mod log;
 pub mod logger;
 pub mod event;
 pub mod transaction;
+pub mod signature;
 pub mod genesis;
 pub mod historian;
 pub mod accountant;

src/log.rs

@@ -169,8 +169,8 @@ pub fn next_ticks(start_hash: &Sha256Hash, num_hashes: u64, len: usize) -> Vec<E
 #[cfg(test)]
 mod tests {
     use super::*;
-    use transaction::{generate_keypair, get_pubkey, sign_claim_data, sign_transaction_data,
+    use signature::{generate_keypair, get_pubkey};
-                      Transaction};
+    use transaction::{sign_claim_data, sign_transaction_data, Transaction};
 
     #[test]
     fn test_event_verify() {

src/logger.rs

@@ -80,6 +80,7 @@ mod tests {
     use super::*;
     use log::*;
     use event::*;
+    use signature::*;
     use transaction::*;
 
     #[test]

src/signature.rs

@@ -0,0 +1,30 @@
+//! The `signature` crate provides functionality for public and private keys
+
+use generic_array::GenericArray;
+use generic_array::typenum::{U32, U64};
+use ring::signature::Ed25519KeyPair;
+use ring::{rand, signature};
+use untrusted;
+
+pub type PublicKey = GenericArray<u8, U32>;
+pub type Signature = GenericArray<u8, U64>;
+
+/// Return a new ED25519 keypair
+pub fn generate_keypair() -> Ed25519KeyPair {
+    let rng = rand::SystemRandom::new();
+    let pkcs8_bytes = signature::Ed25519KeyPair::generate_pkcs8(&rng).unwrap();
+    signature::Ed25519KeyPair::from_pkcs8(untrusted::Input::from(&pkcs8_bytes)).unwrap()
+}
+
+/// Return the public key for the given keypair
+pub fn get_pubkey(keypair: &Ed25519KeyPair) -> PublicKey {
+    GenericArray::clone_from_slice(keypair.public_key_bytes())
+}
+
+/// Verify a signed message with the given public key.
+pub fn verify_signature(peer_public_key_bytes: &[u8], msg_bytes: &[u8], sig_bytes: &[u8]) -> bool {
+    let peer_public_key = untrusted::Input::from(peer_public_key_bytes);
+    let msg = untrusted::Input::from(msg_bytes);
+    let sig = untrusted::Input::from(sig_bytes);
+    signature::verify(&signature::ED25519, peer_public_key, msg, sig).is_ok()
+}

src/transaction.rs

@@ -1,17 +1,11 @@
 //! The `transaction` crate provides functionality for creating log transactions.
 
-use generic_array::GenericArray;
+use signature::{get_pubkey, verify_signature, PublicKey, Signature};
-use generic_array::typenum::{U32, U64};
 use ring::signature::Ed25519KeyPair;
-use ring::{rand, signature};
-use untrusted;
 use serde::Serialize;
 use bincode::serialize;
 use log::Sha256Hash;
 
-pub type PublicKey = GenericArray<u8, U32>;
-pub type Signature = GenericArray<u8, U64>;
-
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Clone)]
 pub struct Transaction<T> {
     pub from: PublicKey,
@@ -38,22 +32,9 @@ impl<T: Serialize> Transaction<T> {
     }
 }
 
-/// Return a new ED25519 keypair
-pub fn generate_keypair() -> Ed25519KeyPair {
-    let rng = rand::SystemRandom::new();
-    let pkcs8_bytes = signature::Ed25519KeyPair::generate_pkcs8(&rng).unwrap();
-    signature::Ed25519KeyPair::from_pkcs8(untrusted::Input::from(&pkcs8_bytes)).unwrap()
-}
-
-/// Return the public key for the given keypair
-pub fn get_pubkey(keypair: &Ed25519KeyPair) -> PublicKey {
-    GenericArray::clone_from_slice(keypair.public_key_bytes())
-}
-
-/// Return a signature for the given data using the private key from the given keypair.
 fn sign_serialized<T: Serialize>(data: &T, keypair: &Ed25519KeyPair) -> Signature {
     let serialized = serialize(data).unwrap();
-    GenericArray::clone_from_slice(keypair.sign(&serialized).as_ref())
+    Signature::clone_from_slice(keypair.sign(&serialized).as_ref())
 }
 
 /// Return a signature for the given transaction data using the private key from the given keypair.
@@ -76,14 +57,6 @@ pub fn sign_claim_data<T: Serialize>(
     sign_transaction_data(data, keypair, &get_pubkey(keypair), last_id)
 }
 
-/// Verify a signed message with the given public key.
-pub fn verify_signature(peer_public_key_bytes: &[u8], msg_bytes: &[u8], sig_bytes: &[u8]) -> bool {
-    let peer_public_key = untrusted::Input::from(peer_public_key_bytes);
-    let msg = untrusted::Input::from(msg_bytes);
-    let sig = untrusted::Input::from(sig_bytes);
-    signature::verify(&signature::ED25519, peer_public_key, msg, sig).is_ok()
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;