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// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
use aes::cipher::block_padding::Pkcs7;
use aes::cipher::BlockDecryptMut;
use aes::cipher::BlockEncryptMut;
use aes::cipher::KeyIvInit;
use deno_core::error::type_error;
use deno_core::error::AnyError;
use deno_core::Resource;
use digest::KeyInit;
use std::borrow::Cow;
use std::cell::RefCell;
use std::rc::Rc;
enum Cipher {
Aes128Cbc(Box<cbc::Encryptor<aes::Aes128>>),
Aes128Ecb(Box<ecb::Encryptor<aes::Aes128>>),
// TODO(kt3k): add more algorithms Aes192Cbc, Aes256Cbc, Aes128GCM, etc.
}
enum Decipher {
Aes128Cbc(Box<cbc::Decryptor<aes::Aes128>>),
Aes128Ecb(Box<ecb::Decryptor<aes::Aes128>>),
// TODO(kt3k): add more algorithms Aes192Cbc, Aes256Cbc, Aes128GCM, etc.
}
pub struct CipherContext {
cipher: Rc<RefCell<Cipher>>,
}
pub struct DecipherContext {
decipher: Rc<RefCell<Decipher>>,
}
impl CipherContext {
pub fn new(algorithm: &str, key: &[u8], iv: &[u8]) -> Result<Self, AnyError> {
Ok(Self {
cipher: Rc::new(RefCell::new(Cipher::new(algorithm, key, iv)?)),
})
}
pub fn encrypt(&self, input: &[u8], output: &mut [u8]) {
self.cipher.borrow_mut().encrypt(input, output);
}
pub fn r#final(
self,
input: &[u8],
output: &mut [u8],
) -> Result<(), AnyError> {
Rc::try_unwrap(self.cipher)
.map_err(|_| type_error("Cipher context is already in use"))?
.into_inner()
.r#final(input, output)
}
}
impl DecipherContext {
pub fn new(algorithm: &str, key: &[u8], iv: &[u8]) -> Result<Self, AnyError> {
Ok(Self {
decipher: Rc::new(RefCell::new(Decipher::new(algorithm, key, iv)?)),
})
}
pub fn decrypt(&self, input: &[u8], output: &mut [u8]) {
self.decipher.borrow_mut().decrypt(input, output);
}
pub fn r#final(
self,
input: &[u8],
output: &mut [u8],
) -> Result<(), AnyError> {
Rc::try_unwrap(self.decipher)
.map_err(|_| type_error("Decipher context is already in use"))?
.into_inner()
.r#final(input, output)
}
}
impl Resource for CipherContext {
fn name(&self) -> Cow<str> {
"cryptoCipher".into()
}
}
impl Resource for DecipherContext {
fn name(&self) -> Cow<str> {
"cryptoDecipher".into()
}
}
impl Cipher {
fn new(
algorithm_name: &str,
key: &[u8],
iv: &[u8],
) -> Result<Self, AnyError> {
use Cipher::*;
Ok(match algorithm_name {
"aes-128-cbc" => {
Aes128Cbc(Box::new(cbc::Encryptor::new(key.into(), iv.into())))
}
"aes-128-ecb" => Aes128Ecb(Box::new(ecb::Encryptor::new(key.into()))),
_ => return Err(type_error(format!("Unknown cipher {algorithm_name}"))),
})
}
/// encrypt encrypts the data in the middle of the input.
fn encrypt(&mut self, input: &[u8], output: &mut [u8]) {
use Cipher::*;
match self {
Aes128Cbc(encryptor) => {
assert!(input.len() % 16 == 0);
for (input, output) in input.chunks(16).zip(output.chunks_mut(16)) {
encryptor.encrypt_block_b2b_mut(input.into(), output.into());
}
}
Aes128Ecb(encryptor) => {
assert!(input.len() % 16 == 0);
for (input, output) in input.chunks(16).zip(output.chunks_mut(16)) {
encryptor.encrypt_block_b2b_mut(input.into(), output.into());
}
}
}
}
/// r#final encrypts the last block of the input data.
fn r#final(self, input: &[u8], output: &mut [u8]) -> Result<(), AnyError> {
assert!(input.len() < 16);
use Cipher::*;
match self {
Aes128Cbc(encryptor) => {
let _ = (*encryptor)
.encrypt_padded_b2b_mut::<Pkcs7>(input, output)
.map_err(|_| type_error("Cannot pad the input data"))?;
Ok(())
}
Aes128Ecb(encryptor) => {
let _ = (*encryptor)
.encrypt_padded_b2b_mut::<Pkcs7>(input, output)
.map_err(|_| type_error("Cannot pad the input data"))?;
Ok(())
}
}
}
}
impl Decipher {
fn new(
algorithm_name: &str,
key: &[u8],
iv: &[u8],
) -> Result<Self, AnyError> {
use Decipher::*;
Ok(match algorithm_name {
"aes-128-cbc" => {
Aes128Cbc(Box::new(cbc::Decryptor::new(key.into(), iv.into())))
}
"aes-128-ecb" => Aes128Ecb(Box::new(ecb::Decryptor::new(key.into()))),
_ => return Err(type_error(format!("Unknown cipher {algorithm_name}"))),
})
}
/// decrypt decrypts the data in the middle of the input.
fn decrypt(&mut self, input: &[u8], output: &mut [u8]) {
use Decipher::*;
match self {
Aes128Cbc(decryptor) => {
assert!(input.len() % 16 == 0);
for (input, output) in input.chunks(16).zip(output.chunks_mut(16)) {
decryptor.decrypt_block_b2b_mut(input.into(), output.into());
}
}
Aes128Ecb(decryptor) => {
assert!(input.len() % 16 == 0);
for (input, output) in input.chunks(16).zip(output.chunks_mut(16)) {
decryptor.decrypt_block_b2b_mut(input.into(), output.into());
}
}
}
}
/// r#final decrypts the last block of the input data.
fn r#final(self, input: &[u8], output: &mut [u8]) -> Result<(), AnyError> {
assert!(input.len() == 16);
use Decipher::*;
match self {
Aes128Cbc(decryptor) => {
let _ = (*decryptor)
.decrypt_padded_b2b_mut::<Pkcs7>(input, output)
.map_err(|_| type_error("Cannot unpad the input data"))?;
Ok(())
}
Aes128Ecb(decryptor) => {
let _ = (*decryptor)
.decrypt_padded_b2b_mut::<Pkcs7>(input, output)
.map_err(|_| type_error("Cannot unpad the input data"))?;
Ok(())
}
}
}
}
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