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use crate::errors::InvalidLength;
use crate::{FromKey, FromKeyNonce};
use core::convert::TryInto;
use generic_array::{typenum::Unsigned, ArrayLength, GenericArray};
pub type BlockCipherKey<B> = GenericArray<u8, <B as FromKey>::KeySize>;
pub type Block<B> = GenericArray<u8, <B as BlockCipher>::BlockSize>;
pub type ParBlocks<B> = GenericArray<Block<B>, <B as BlockCipher>::ParBlocks>;
pub trait BlockCipher {
type BlockSize: ArrayLength<u8>;
type ParBlocks: ArrayLength<Block<Self>>;
}
pub trait BlockEncrypt: BlockCipher {
fn encrypt_block(&self, block: &mut Block<Self>);
#[inline]
fn encrypt_par_blocks(&self, blocks: &mut ParBlocks<Self>) {
for block in blocks.iter_mut() {
self.encrypt_block(block);
}
}
#[inline]
fn encrypt_blocks(&self, mut blocks: &mut [Block<Self>]) {
let pb = Self::ParBlocks::to_usize();
if pb > 1 {
let mut iter = blocks.chunks_exact_mut(pb);
for chunk in &mut iter {
self.encrypt_par_blocks(chunk.try_into().unwrap())
}
blocks = iter.into_remainder();
}
for block in blocks {
self.encrypt_block(block);
}
}
}
pub trait BlockDecrypt: BlockCipher {
fn decrypt_block(&self, block: &mut Block<Self>);
#[inline]
fn decrypt_par_blocks(&self, blocks: &mut ParBlocks<Self>) {
for block in blocks.iter_mut() {
self.decrypt_block(block);
}
}
#[inline]
fn decrypt_blocks(&self, mut blocks: &mut [Block<Self>]) {
let pb = Self::ParBlocks::to_usize();
if pb > 1 {
let mut iter = blocks.chunks_exact_mut(pb);
for chunk in &mut iter {
self.decrypt_par_blocks(chunk.try_into().unwrap())
}
blocks = iter.into_remainder();
}
for block in blocks {
self.decrypt_block(block);
}
}
}
pub trait BlockEncryptMut: BlockCipher {
fn encrypt_block_mut(&mut self, block: &mut Block<Self>);
}
pub trait BlockDecryptMut: BlockCipher {
fn decrypt_block_mut(&mut self, block: &mut Block<Self>);
}
impl<Alg: BlockEncrypt> BlockEncryptMut for Alg {
fn encrypt_block_mut(&mut self, block: &mut Block<Self>) {
self.encrypt_block(block);
}
}
impl<Alg: BlockDecrypt> BlockDecryptMut for Alg {
fn decrypt_block_mut(&mut self, block: &mut Block<Self>) {
self.decrypt_block(block);
}
}
impl<Alg: BlockCipher> BlockCipher for &Alg {
type BlockSize = Alg::BlockSize;
type ParBlocks = Alg::ParBlocks;
}
impl<Alg: BlockEncrypt> BlockEncrypt for &Alg {
#[inline]
fn encrypt_block(&self, block: &mut Block<Self>) {
Alg::encrypt_block(self, block);
}
#[inline]
fn encrypt_par_blocks(&self, blocks: &mut ParBlocks<Self>) {
Alg::encrypt_par_blocks(self, blocks);
}
#[inline]
fn encrypt_blocks(&self, blocks: &mut [Block<Self>]) {
Alg::encrypt_blocks(self, blocks);
}
}
impl<Alg: BlockDecrypt> BlockDecrypt for &Alg {
#[inline]
fn decrypt_block(&self, block: &mut Block<Self>) {
Alg::decrypt_block(self, block);
}
#[inline]
fn decrypt_par_blocks(&self, blocks: &mut ParBlocks<Self>) {
Alg::decrypt_par_blocks(self, blocks);
}
#[inline]
fn decrypt_blocks(&self, blocks: &mut [Block<Self>]) {
Alg::decrypt_blocks(self, blocks);
}
}
pub trait FromBlockCipher {
type BlockCipher: BlockCipher;
fn from_block_cipher(cipher: Self::BlockCipher) -> Self;
}
pub trait FromBlockCipherNonce {
type BlockCipher: BlockCipher;
type NonceSize: ArrayLength<u8>;
fn from_block_cipher_nonce(
cipher: Self::BlockCipher,
nonce: &GenericArray<u8, Self::NonceSize>,
) -> Self;
}
impl<T> FromKeyNonce for T
where
T: FromBlockCipherNonce,
T::BlockCipher: FromKey,
{
type KeySize = <T::BlockCipher as FromKey>::KeySize;
type NonceSize = T::NonceSize;
fn new(
key: &GenericArray<u8, Self::KeySize>,
nonce: &GenericArray<u8, Self::NonceSize>,
) -> Self {
Self::from_block_cipher_nonce(T::BlockCipher::new(key), nonce)
}
}
impl<T> FromKey for T
where
T: FromBlockCipher,
T::BlockCipher: FromKey,
{
type KeySize = <T::BlockCipher as FromKey>::KeySize;
fn new(key: &GenericArray<u8, Self::KeySize>) -> Self {
Self::from_block_cipher(T::BlockCipher::new(key))
}
fn new_from_slice(key: &[u8]) -> Result<Self, InvalidLength> {
T::BlockCipher::new_from_slice(key)
.map_err(|_| InvalidLength)
.map(Self::from_block_cipher)
}
}