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//!
use lcc::{traits::{AutoEncoder, Encryptable, EncryptionHandler},
EncryptedBody};
use miscreant::aead::{Aes256Siv, Algorithm};
use super::data::PackedData;
use super::databody::DataBody;
use super::{keys::{Key, KEY_LENGTH},
utils::random};
use std::collections::BTreeMap;
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,
iv: random::bytes(KEY_LENGTH),
}
}
pub fn from_pw(pw: &str, salt: &str) -> Self {
let key = Key::from_password(pw, salt);
Self {
ctx: Aes256Siv::new(&key.to_slice()),
key,
iv: random::bytes(KEY_LENGTH),
}
}
}
impl EncryptionHandler<DataBody> for AesEngine {
fn encrypt(&mut self, item: DataBody) -> EncryptedBody {
let ser = item.encode();
let nonce = random::bytes(64);
let iv = &self.iv.as_slice();
let data = &ser.as_bytes();
let encrypted = self.ctx.seal(nonce.as_slice(), iv, data);
let data = PackedData {
iv: self.iv.clone(),
data: encrypted,
nonce: nonce,
}.encode();
EncryptedBody { data }
}
fn decrypt(&mut self, item: EncryptedBody) -> Option<DataBody> {
let packed = PackedData::decode(&item.data);
let iv = &self.iv.as_slice();
let decrypted = self.ctx
.open(packed.nonce.as_slice(), iv, packed.data.as_slice())
.ok()?;
Some(DataBody::decode(&String::from_utf8(decrypted).ok()?))
}
}
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