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#[cfg(not(feature = "with-openssl"))]
pub mod aes {
pub type Aes128Ctr = ctr::Ctr128BE<aes::Aes128>;
pub type Aes256Ctr = ctr::Ctr128BE<aes::Aes256>;
}
#[cfg(feature = "with-openssl")]
pub mod aes {
use cipher::generic_array::GenericArray;
use cipher::inout::InOutBuf;
use cipher::{InnerIvInit, IvSizeUser, StreamCipher, StreamCipherError};
use digest::crypto_common::{InnerUser, KeyInit, KeySizeUser};
use openssl::symm::{Cipher, Crypter, Mode};
pub struct Aes128Ctr(Crypter);
pub struct Aes128Key([u8; 16]);
impl KeySizeUser for Aes128Key {
type KeySize = typenum::consts::U16;
}
impl KeyInit for Aes128Key {
fn new(key: &GenericArray<u8, Self::KeySize>) -> Self {
Aes128Key((*key).into())
}
}
impl InnerUser for Aes128Ctr {
type Inner = Aes128Key;
}
impl IvSizeUser for Aes128Ctr {
type IvSize = typenum::consts::U16;
}
impl StreamCipher for Aes128Ctr {
fn try_apply_keystream_inout(
&mut self,
mut buf: InOutBuf<'_, '_, u8>,
) -> Result<(), StreamCipherError> {
let in_buf = buf.get_in().to_vec();
self.0
.update(&in_buf, buf.get_out())
.map_err(|_| StreamCipherError)?;
Ok(())
}
}
impl InnerIvInit for Aes128Ctr {
fn inner_iv_init(inner: Self::Inner, iv: &GenericArray<u8, Self::IvSize>) -> Self {
let crypter = Crypter::new(Cipher::aes_128_ctr(), Mode::Encrypt, &inner.0, Some(iv))
.expect("openssl error while initializing Aes128Ctr");
Aes128Ctr(crypter)
}
}
pub struct Aes256Ctr(Crypter);
pub struct Aes256Key([u8; 32]);
impl KeySizeUser for Aes256Key {
type KeySize = typenum::consts::U32;
}
impl KeyInit for Aes256Key {
fn new(key: &GenericArray<u8, Self::KeySize>) -> Self {
Aes256Key((*key).into())
}
}
impl InnerUser for Aes256Ctr {
type Inner = Aes256Key;
}
impl IvSizeUser for Aes256Ctr {
type IvSize = typenum::consts::U16;
}
impl StreamCipher for Aes256Ctr {
fn try_apply_keystream_inout(
&mut self,
mut buf: InOutBuf<'_, '_, u8>,
) -> Result<(), StreamCipherError> {
let in_buf = buf.get_in().to_vec();
self.0
.update(&in_buf, buf.get_out())
.map_err(|_| StreamCipherError)?;
Ok(())
}
}
impl InnerIvInit for Aes256Ctr {
fn inner_iv_init(inner: Self::Inner, iv: &GenericArray<u8, Self::IvSize>) -> Self {
let crypter = Crypter::new(Cipher::aes_256_ctr(), Mode::Encrypt, &inner.0, Some(iv))
.expect("openssl error while initializing Aes256Ctr");
Aes256Ctr(crypter)
}
}
}