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use crate::{Error, Result};
use bls::{self, serde_impl::SerdeSecret, PublicKey, SecretKey, PK_SIZE};
use std::path::Path;
use tokio::fs;
const REWARD_PUBLIC_KEY_FILENAME: &str = "reward_public_key";
const REWARD_SECRET_KEY_FILENAME: &str = "reward_secret_key";
pub async fn store_new_reward_keypair(
root_dir: &Path,
secret: &SecretKey,
public: &PublicKey,
) -> Result<()> {
let secret_key_path = root_dir.join(REWARD_SECRET_KEY_FILENAME);
let public_key_path = root_dir.join(REWARD_PUBLIC_KEY_FILENAME);
fs::write(secret_key_path, sk_to_hex(secret)).await?;
fs::write(public_key_path, pk_to_hex(public)).await?;
Ok(())
}
pub async fn get_reward_pk(root_dir: &Path) -> Result<Option<PublicKey>> {
let path = root_dir.join(REWARD_PUBLIC_KEY_FILENAME);
if !path.is_file() {
return Ok(None);
}
let bytes = fs::read(path).await?;
Ok(Some(pk_from_bytes(bytes)?))
}
pub fn pk_to_hex(pk: &PublicKey) -> String {
let pk_as_bytes: [u8; PK_SIZE] = pk.to_bytes();
vec_to_hex(pk_as_bytes.to_vec())
}
pub fn pk_from_bytes(bytes: Vec<u8>) -> Result<PublicKey> {
let hex = String::from_utf8(bytes)
.map_err(|_| Error::Logic("Config error: Could not parse bytes as string".to_string()))?;
pk_from_hex(&hex)
}
pub fn pk_from_hex(hex_str: &str) -> Result<PublicKey> {
let pk_bytes = parse_hex(&hex_str);
let mut pk_bytes_array: [u8; PK_SIZE] = [0; PK_SIZE];
pk_bytes_array.copy_from_slice(&pk_bytes[..PK_SIZE]);
PublicKey::from_bytes(pk_bytes_array)
.map_err(|_| Error::Logic("Config error: Invalid public key bytes".to_string()))
}
fn sk_to_hex(secret: &SecretKey) -> String {
let sk_serialised = bincode::serialize(&SerdeSecret(secret))
.expect("Failed to serialise the generated secret key");
vec_to_hex(sk_serialised)
}
fn vec_to_hex(hash: Vec<u8>) -> String {
hash.iter().map(|b| format!("{:02x}", b)).collect()
}
fn parse_hex(hex_str: &str) -> Vec<u8> {
let mut hex_bytes = hex_str
.as_bytes()
.iter()
.filter_map(|b| match b {
b'0'..=b'9' => Some(b - b'0'),
b'a'..=b'f' => Some(b - b'a' + 10),
b'A'..=b'F' => Some(b - b'A' + 10),
_ => None,
})
.fuse();
let mut bytes = Vec::new();
while let (Some(h), Some(l)) = (hex_bytes.next(), hex_bytes.next()) {
bytes.push(h << 4 | l)
}
bytes
}
#[cfg(test)]
mod test {
use super::*;
use tempdir::TempDir;
#[test]
fn pubkey_hex() -> Result<()> {
let key = gen_key();
let encoded = pk_to_hex(&key);
println!("{:?}", encoded);
let decoded: PublicKey = pk_from_hex(&encoded)?;
assert_eq!(decoded, key);
Ok(())
}
#[tokio::test]
async fn pubkey_to_and_from_file() -> Result<()> {
let sk = SecretKey::random();
let pk = sk.public_key();
let root = create_temp_root(&"rewardkey")?;
let root_dir = root.path();
store_new_reward_keypair(root_dir, &sk, &pk).await?;
let pk_result = get_reward_pk(root_dir).await?;
assert_eq!(pk_result, Some(pk));
Ok(())
}
fn gen_key() -> PublicKey {
SecretKey::random().public_key()
}
fn create_temp_root(dir: &str) -> Result<TempDir> {
TempDir::new(dir).map_err(|e| Error::TempDirCreationFailed(e.to_string()))
}
}