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use crate::error::Error;
use crate::msgs::codec;
use crate::msgs::message::{BorrowedPlainMessage, OpaqueMessage, PlainMessage};
use ring::{aead, hkdf};
pub trait MessageDecrypter: Send + Sync {
fn decrypt(&self, m: OpaqueMessage, seq: u64) -> Result<PlainMessage, Error>;
}
pub(crate) trait MessageEncrypter: Send + Sync {
fn encrypt(&self, m: BorrowedPlainMessage, seq: u64) -> Result<OpaqueMessage, Error>;
}
impl dyn MessageEncrypter {
pub(crate) fn invalid() -> Box<dyn MessageEncrypter> {
Box::new(InvalidMessageEncrypter {})
}
}
impl dyn MessageDecrypter {
pub(crate) fn invalid() -> Box<dyn MessageDecrypter> {
Box::new(InvalidMessageDecrypter {})
}
}
#[derive(Default)]
pub(crate) struct Iv(pub(crate) [u8; ring::aead::NONCE_LEN]);
impl Iv {
#[cfg(feature = "tls12")]
fn new(value: [u8; ring::aead::NONCE_LEN]) -> Self {
Self(value)
}
#[cfg(feature = "tls12")]
pub(crate) fn copy(value: &[u8]) -> Self {
debug_assert_eq!(value.len(), ring::aead::NONCE_LEN);
let mut iv = Self::new(Default::default());
iv.0.copy_from_slice(value);
iv
}
#[cfg(test)]
pub(crate) fn value(&self) -> &[u8; 12] {
&self.0
}
}
pub(crate) struct IvLen;
impl hkdf::KeyType for IvLen {
fn len(&self) -> usize {
aead::NONCE_LEN
}
}
impl From<hkdf::Okm<'_, IvLen>> for Iv {
fn from(okm: hkdf::Okm<IvLen>) -> Self {
let mut r = Self(Default::default());
okm.fill(&mut r.0[..]).unwrap();
r
}
}
pub(crate) fn make_nonce(iv: &Iv, seq: u64) -> ring::aead::Nonce {
let mut nonce = [0u8; ring::aead::NONCE_LEN];
codec::put_u64(seq, &mut nonce[4..]);
nonce
.iter_mut()
.zip(iv.0.iter())
.for_each(|(nonce, iv)| {
*nonce ^= *iv;
});
aead::Nonce::assume_unique_for_key(nonce)
}
struct InvalidMessageEncrypter {}
impl MessageEncrypter for InvalidMessageEncrypter {
fn encrypt(&self, _m: BorrowedPlainMessage, _seq: u64) -> Result<OpaqueMessage, Error> {
Err(Error::General("encrypt not yet available".to_string()))
}
}
struct InvalidMessageDecrypter {}
impl MessageDecrypter for InvalidMessageDecrypter {
fn decrypt(&self, _m: OpaqueMessage, _seq: u64) -> Result<PlainMessage, Error> {
Err(Error::DecryptError)
}
}