#![no_std]
#![cfg_attr(docsrs, feature(doc_cfg))]
#![doc(html_logo_url = "https://raw.githubusercontent.com/RustCrypto/meta/master/logo_small.png")]
#![forbid(unsafe_code)]
#![warn(missing_docs, rust_2018_idioms)]
#[cfg(feature = "std")]
extern crate std;
#[cfg(feature = "dev")]
#[cfg_attr(docsrs, doc(cfg(feature = "dev")))]
pub mod dev;
mod errors;
pub use crate::errors::InvalidKeyLength;
pub use generic_array::{self, typenum::consts};
use generic_array::typenum::Unsigned;
use generic_array::{ArrayLength, GenericArray};
pub type Key<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: &Key<Self>) -> Self;
fn new_varkey(key: &[u8]) -> Result<Self, InvalidKeyLength> {
if key.len() != Self::KeySize::to_usize() {
Err(InvalidKeyLength)
} else {
Ok(Self::new(GenericArray::from_slice(key)))
}
}
}
pub trait BlockCipher {
type BlockSize: ArrayLength<u8>;
type ParBlocks: ArrayLength<Block<Self>>;
fn encrypt_block(&self, block: &mut Block<Self>);
fn decrypt_block(&self, block: &mut Block<Self>);
#[inline]
fn encrypt_blocks(&self, blocks: &mut ParBlocks<Self>) {
for block in blocks.iter_mut() {
self.encrypt_block(block);
}
}
#[inline]
fn decrypt_blocks(&self, blocks: &mut ParBlocks<Self>) {
for block in blocks.iter_mut() {
self.decrypt_block(block);
}
}
}
pub trait BlockCipherMut {
type BlockSize: ArrayLength<u8>;
fn encrypt_block(&mut self, block: &mut GenericArray<u8, Self::BlockSize>);
fn decrypt_block(&mut self, block: &mut GenericArray<u8, Self::BlockSize>);
}
impl<Alg: BlockCipher> BlockCipherMut for Alg {
type BlockSize = Alg::BlockSize;
fn encrypt_block(&mut self, block: &mut GenericArray<u8, Self::BlockSize>) {
<Self as BlockCipher>::encrypt_block(self, block);
}
fn decrypt_block(&mut self, block: &mut GenericArray<u8, Self::BlockSize>) {
<Self as BlockCipher>::decrypt_block(self, block);
}
}