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//!
use lcc::traits::{AutoEncoder, Encryptable, EncryptionHandler};
use lcc::{EncryptedBody, PackedData};
use miscreant::aead::{Aes256Siv, Algorithm};
use super::databody::DataBody;
use lcc::crypto::random;
use lcc::crypto::{Key, KEY_LENGTH};
impl Encryptable for DataBody {}
pub struct AesEngine {
ctx: Aes256Siv,
_key: Key,
iv: Vec<u8>,
}
impl AesEngine {
/// Generate new key and encryption engine
pub fn generate() -> Self {
let key = Key::generate();
Self {
ctx: Aes256Siv::new(&key.to_slice()),
_key: key,
iv: random::bytes(KEY_LENGTH),
}
}
/// Generate an Aes context from password
pub fn from_pw(pw: &str, salt: &str) -> Self {
let key = Key::from_password(pw, salt);
Self {
ctx: Aes256Siv::new(&key.to_slice()),
_key: key,
iv: random::bytes(KEY_LENGTH),
}
}
/// Load a packed data object which contains an Aes context
pub fn load(packed: PackedData, pw: &str, salt: &str) -> Option<Self> {
let mut temp = Self::from_pw(pw, salt);
let k = Key::decode(&String::from_utf8(temp.decrypt_primitive(&packed)?).ok()?);
Some(Self {
ctx: Aes256Siv::new(&k.to_slice()),
_key: k,
iv: packed.iv
})
}
/// Serialise the current context to save it somewhere
pub fn save(&mut self) -> PackedData {
let k = self._key.to_vec();
self.encrypt_primitive(&k)
}
fn encrypt_primitive(&mut self, data: &Vec<u8>) -> PackedData {
let nonce = random::bytes(64);
let iv = &self.iv.as_slice();
let encrypted = self.ctx.seal(nonce.as_slice(), iv, data.as_slice());
PackedData {
iv: self.iv.clone(),
data: encrypted,
nonce: nonce,
}
}
fn decrypt_primitive(&mut self, packed: &PackedData) -> Option<Vec<u8>> {
let iv = &self.iv.as_slice();
Some(self.ctx
.open(packed.nonce.as_slice(), iv, packed.data.as_slice())
.ok()?)
}
}
impl EncryptionHandler<DataBody> for AesEngine {
fn encrypt(&mut self, item: DataBody) -> EncryptedBody {
let ser = item.encode();
let data = self.encrypt_primitive(&ser.as_bytes().to_vec()).encode();
EncryptedBody { data }
}
fn decrypt(&mut self, item: EncryptedBody) -> Option<DataBody> {
let packed = PackedData::decode(&item.data);
Some(DataBody::decode(&String::from_utf8(
self.decrypt_primitive(&packed)?,
).ok()?))
}
}
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