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use crate::pubkey::Pubkey;
use bs58;
use ed25519_dalek;
use generic_array::typenum::U64;
use generic_array::GenericArray;
use rand::rngs::OsRng;
use serde_json;
use std::error;
use std::fmt;
use std::fs::{self, File};
use std::io::Write;
use std::path::Path;
pub type Keypair = ed25519_dalek::Keypair;
#[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 {
Self(GenericArray::clone_from_slice(&signature_slice))
}
pub fn verify(&self, pubkey_bytes: &[u8], message_bytes: &[u8]) -> bool {
let pubkey = ed25519_dalek::PublicKey::from_bytes(pubkey_bytes);
let signature = ed25519_dalek::Signature::from_bytes(self.0.as_slice());
if pubkey.is_err() || signature.is_err() {
return false;
}
pubkey
.unwrap()
.verify(message_bytes, &signature.unwrap())
.is_ok()
}
}
pub trait Signable {
fn sign(&mut self, keypair: &Keypair) {
let data = self.signable_data();
self.set_signature(keypair.sign_message(&data));
}
fn verify(&self) -> bool {
self.get_signature()
.verify(&self.pubkey().as_ref(), &self.signable_data())
}
fn pubkey(&self) -> Pubkey;
fn signable_data(&self) -> Vec<u8>;
fn get_signature(&self) -> Signature;
fn set_signature(&mut self, signature: Signature);
}
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;
fn sign_message(&self, message: &[u8]) -> Signature;
}
impl KeypairUtil for Keypair {
fn new() -> Self {
let mut rng = OsRng::new().unwrap();
Keypair::generate(&mut rng)
}
fn pubkey(&self) -> Pubkey {
Pubkey::new(&self.public.as_ref())
}
fn sign_message(&self, message: &[u8]) -> Signature {
Signature::new(&self.sign(message).to_bytes())
}
}
pub fn read_keypair(path: &str) -> Result<Keypair, Box<error::Error>> {
let file = File::open(path.to_string())?;
let bytes: Vec<u8> = serde_json::from_reader(file)?;
let keypair = Keypair::from_bytes(&bytes).unwrap();
Ok(keypair)
}
pub fn gen_keypair_file(outfile: String) -> Result<String, Box<error::Error>> {
let keypair_bytes = Keypair::new().to_bytes();
let serialized = serde_json::to_string(&keypair_bytes.to_vec())?;
if outfile != "-" {
if let Some(outdir) = Path::new(&outfile).parent() {
fs::create_dir_all(outdir)?;
}
let mut f = File::create(outfile)?;
f.write_all(&serialized.clone().into_bytes())?;
}
Ok(serialized)
}
#[cfg(test)]
mod tests {
use super::*;
use std::mem;
fn tmp_file_path(name: &str) -> String {
use std::env;
let out_dir = env::var("OUT_DIR").unwrap_or_else(|_| "target".to_string());
let keypair = Keypair::new();
format!("{}/tmp/{}-{}", out_dir, name, keypair.pubkey()).to_string()
}
#[test]
fn test_gen_keypair_file() {
let outfile = tmp_file_path("test_gen_keypair_file.json");
let serialized_keypair = gen_keypair_file(outfile.to_string()).unwrap();
let keypair_vec: Vec<u8> = serde_json::from_str(&serialized_keypair).unwrap();
assert!(Path::new(&outfile).exists());
assert_eq!(
keypair_vec,
read_keypair(&outfile).unwrap().to_bytes().to_vec()
);
assert_eq!(
read_keypair(&outfile).unwrap().pubkey().as_ref().len(),
mem::size_of::<Pubkey>()
);
fs::remove_file(&outfile).unwrap();
assert!(!Path::new(&outfile).exists());
}
}