Move drone into its own crate

sdk/src/signature.rs

@@ -0,0 +1,80 @@
+//! The `signature` module provides functionality for public, and private keys.
+
+use bs58;
+use generic_array::typenum::U64;
+use generic_array::GenericArray;
+use pubkey::Pubkey;
+use ring::signature::Ed25519KeyPair;
+use ring::{rand, signature};
+use serde_json;
+use std::error;
+use std::fmt;
+use std::fs::File;
+use untrusted::Input;
+
+pub type Keypair = Ed25519KeyPair;
+
+#[derive(Serialize, Deserialize, Clone, Copy, Default, Eq, PartialEq, Ord, PartialOrd, Hash)]
+pub struct Signature(GenericArray<u8, U64>);
+
+impl Signature {
+    pub fn new(signature_slice: &[u8]) -> Self {
+        Signature(GenericArray::clone_from_slice(&signature_slice))
+    }
+
+    pub fn verify(&self, pubkey_bytes: &[u8], message_bytes: &[u8]) -> bool {
+        let pubkey = Input::from(pubkey_bytes);
+        let message = Input::from(message_bytes);
+        let signature = Input::from(self.0.as_slice());
+        signature::verify(&signature::ED25519, pubkey, message, signature).is_ok()
+    }
+}
+
+impl AsRef<[u8]> for Signature {
+    fn as_ref(&self) -> &[u8] {
+        &self.0[..]
+    }
+}
+
+impl fmt::Debug for Signature {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", bs58::encode(self.0).into_string())
+    }
+}
+
+impl fmt::Display for Signature {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", bs58::encode(self.0).into_string())
+    }
+}
+
+pub trait KeypairUtil {
+    fn new() -> Self;
+    fn pubkey(&self) -> Pubkey;
+}
+
+impl KeypairUtil for Ed25519KeyPair {
+    /// Return a new ED25519 keypair
+    fn new() -> Self {
+        let rng = rand::SystemRandom::new();
+        let pkcs8_bytes = Ed25519KeyPair::generate_pkcs8(&rng).expect("generate_pkcs8");
+        Ed25519KeyPair::from_pkcs8(Input::from(&pkcs8_bytes)).expect("from_pcks8")
+    }
+
+    /// Return the public key for the given keypair
+    fn pubkey(&self) -> Pubkey {
+        Pubkey::new(self.public_key_bytes())
+    }
+}
+
+pub fn read_pkcs8(path: &str) -> Result<Vec<u8>, Box<error::Error>> {
+    let file = File::open(path.to_string())?;
+    let pkcs8: Vec<u8> = serde_json::from_reader(file)?;
+    Ok(pkcs8)
+}
+
+pub fn read_keypair(path: &str) -> Result<Keypair, Box<error::Error>> {
+    let pkcs8 = read_pkcs8(path)?;
+    let keypair = Ed25519KeyPair::from_pkcs8(Input::from(&pkcs8))?;
+    Ok(keypair)
+}