feat/node: add data signing and signature verification public apis

src/node/mod.rs

@@ -33,6 +33,7 @@ use crate::{
     TransportConfig,
 };
 use bytes::Bytes;
+use ed25519_dalek::Signature;
 use itertools::Itertools;
 use std::{net::SocketAddr, sync::Arc};
 use tokio::sync::mpsc;
@@ -130,6 +131,16 @@ impl Node {
         self.stage.public_key().await
     }
 
+    /// Sign any data with the key of this node.
+    pub async fn sign(&self, data: &[u8]) -> Signature {
+        self.stage.sign(data).await
+    }
+
+    /// Verify any signed data with the key of this node.
+    pub async fn verify(&self, data: &[u8], signature: &Signature) -> bool {
+        self.stage.verify(data, signature).await
+    }
+
     /// The name of this node.
     pub async fn name(&self) -> XorName {
         self.stage.name().await

src/node/stage/mod.rs

@@ -29,7 +29,7 @@ use crate::{
 };
 use bls_signature_aggregator::Proof;
 use bytes::Bytes;
-use ed25519_dalek::PublicKey;
+use ed25519_dalek::{PublicKey, Signature, Signer};
 use std::{
     fmt::{self, Debug, Formatter},
     net::SocketAddr,
@@ -167,6 +167,24 @@ impl Stage {
         node_info.keypair.public
     }
 
+    pub async fn sign(&self, msg: &[u8]) -> Signature {
+        let state = self.state.lock().await;
+        match &*state {
+            State::Bootstrapping(state) => state.node_info.keypair.sign(msg),
+            State::Joining(state) => state.node_info.keypair.sign(msg),
+            State::Approved(state) => state.node_info.keypair.sign(msg),
+        }
+    }
+
+    pub async fn verify(&self, msg: &[u8], signature: &Signature) -> bool {
+        let state = self.state.lock().await;
+        match &*state {
+            State::Bootstrapping(state) => state.node_info.keypair.verify(msg, signature).is_ok(),
+            State::Joining(state) => state.node_info.keypair.verify(msg, signature).is_ok(),
+            State::Approved(state) => state.node_info.keypair.verify(msg, signature).is_ok(),
+        }
+    }
+
     /// Our `Prefix` once we are a part of the section.
     pub async fn our_prefix(&self) -> Option<Prefix> {
         self.state