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use crate::{CryptoStorage, Error, KVStorage, PublicKeyResponse};
use diem_crypto::{
ed25519::{Ed25519PrivateKey, Ed25519PublicKey, Ed25519Signature},
hash::CryptoHash,
PrivateKey, SigningKey, Uniform,
};
use rand::{rngs::OsRng, Rng, SeedableRng};
use serde::ser::Serialize;
pub trait CryptoKVStorage: KVStorage {}
impl<T: CryptoKVStorage> CryptoStorage for T {
fn create_key(&mut self, name: &str) -> Result<Ed25519PublicKey, Error> {
let (private_key, public_key) = new_ed25519_key_pair();
self.import_private_key(name, private_key)?;
Ok(public_key)
}
fn export_private_key(&self, name: &str) -> Result<Ed25519PrivateKey, Error> {
self.get(name).map(|v| v.value)
}
fn export_private_key_for_version(
&self,
name: &str,
version: Ed25519PublicKey,
) -> Result<Ed25519PrivateKey, Error> {
let current_private_key = self.export_private_key(name)?;
if current_private_key.public_key().eq(&version) {
return Ok(current_private_key);
}
match self.export_private_key(&get_previous_version_name(name)) {
Ok(previous_private_key) => {
if previous_private_key.public_key().eq(&version) {
Ok(previous_private_key)
} else {
Err(Error::KeyVersionNotFound(name.into(), version.to_string()))
}
}
Err(Error::KeyNotSet(_)) => {
Err(Error::KeyVersionNotFound(name.into(), version.to_string()))
}
Err(e) => Err(e),
}
}
fn import_private_key(&mut self, name: &str, key: Ed25519PrivateKey) -> Result<(), Error> {
self.set(name, key)
}
fn get_public_key(&self, name: &str) -> Result<PublicKeyResponse, Error> {
let response = self.get(name)?;
let key: Ed25519PrivateKey = response.value;
Ok(PublicKeyResponse {
last_update: response.last_update,
public_key: key.public_key(),
})
}
fn get_public_key_previous_version(&self, name: &str) -> Result<Ed25519PublicKey, Error> {
match self.export_private_key(&get_previous_version_name(name)) {
Ok(previous_private_key) => Ok(previous_private_key.public_key()),
Err(Error::KeyNotSet(_)) => Err(Error::KeyVersionNotFound(
name.into(),
"previous version".into(),
)),
Err(e) => Err(e),
}
}
fn rotate_key(&mut self, name: &str) -> Result<Ed25519PublicKey, Error> {
let private_key: Ed25519PrivateKey = self.get(name)?.value;
let (new_private_key, new_public_key) = new_ed25519_key_pair();
self.set(&get_previous_version_name(name), private_key)?;
self.set(name, new_private_key)?;
Ok(new_public_key)
}
fn sign<U: CryptoHash + Serialize>(
&self,
name: &str,
message: &U,
) -> Result<Ed25519Signature, Error> {
let private_key = self.export_private_key(name)?;
Ok(private_key.sign(message))
}
fn sign_using_version<U: CryptoHash + Serialize>(
&self,
name: &str,
version: Ed25519PublicKey,
message: &U,
) -> Result<Ed25519Signature, Error> {
let private_key = self.export_private_key_for_version(name, version)?;
Ok(private_key.sign(message))
}
}
fn new_ed25519_key_pair() -> (Ed25519PrivateKey, Ed25519PublicKey) {
let mut seed_rng = OsRng;
let mut rng = rand::rngs::StdRng::from_seed(seed_rng.gen());
let private_key = Ed25519PrivateKey::generate(&mut rng);
let public_key = private_key.public_key();
(private_key, public_key)
}
fn get_previous_version_name(name: &str) -> String {
format!("{}_previous", name)
}