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