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use crate::errors::InvalidLength;
use core::convert::TryInto;
use generic_array::{typenum::Unsigned, ArrayLength, GenericArray};
pub type BlockCipherKey<B> = GenericArray<u8, <B as NewBlockCipher>::KeySize>;
pub type Block<B> = GenericArray<u8, <B as BlockCipher>::BlockSize>;
pub type ParBlocks<B> = GenericArray<Block<B>, <B as BlockCipher>::ParBlocks>;
pub trait NewBlockCipher: Sized {
type KeySize: ArrayLength<u8>;
fn new(key: &BlockCipherKey<Self>) -> Self;
fn new_var(key: &[u8]) -> Result<Self, InvalidLength> {
if key.len() != Self::KeySize::to_usize() {
Err(InvalidLength)
} else {
Ok(Self::new(GenericArray::from_slice(key)))
}
}
}
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);
}
}