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nora 2024-08-10 17:57:30 +02:00
parent 553f261396
commit 0bd4f7d9ef
3 changed files with 24 additions and 37 deletions
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32
ssh-transport/src/keys.rs
View file

@ -1,4 +1,4 @@
use chacha20poly1305::{ChaCha20Poly1305, KeyInit};
use chacha20::cipher::{KeyInit, KeyIvInit, StreamCipher, StreamCipherSeek};
use sha2::Digest;
use crate::Result;
@ -55,7 +55,8 @@ impl Decryptor for Session {
}
fn decrypt_packet(&mut self, bytes: &mut [u8], packet_number: u64) {
self.encryption_key_client_to_server.decrypt_packet(bytes, packet_number);
self.encryption_key_client_to_server
.decrypt_packet(bytes, packet_number);
}
fn rekey(&mut self, h: [u8; 32], k: [u8; 32]) -> Result<(), ()> {
@ -110,28 +111,39 @@ pub(crate) fn encode_mpint_for_hash(mut key: &[u8], mut add_to_hash: impl FnMut(
type SshChaCha20 = chacha20::ChaCha20Legacy;
struct SshChaCha20Poly1305 {
header_key: [u8; 32],
main: ChaCha20Poly1305,
header_key: chacha20::Key,
main_key: chacha20::Key,
}
impl SshChaCha20Poly1305 {
fn new(key: [u8; 64]) -> Self {
Self {
main: ChaCha20Poly1305::new(&<[u8; 32]>::try_from(&key[..32]).unwrap().into()),
header_key: key[32..].try_into().unwrap(),
main_key: <[u8; 32]>::try_from(&key[..32]).unwrap().into(),
header_key: <[u8; 32]>::try_from(&key[32..]).unwrap().into(),
}
}
fn decrypt_len(&self, bytes: &mut [u8], packet_number: u64) {
use chacha20::cipher::{KeyIvInit, StreamCipher};
// <https://github.com/openssh/openssh-portable/blob/1ec0a64c5dc57b8a2053a93b5ef0d02ff8598e5c/PROTOCOL.chacha20poly1305>
let mut cipher =
SshChaCha20::new(&self.header_key.into(), &packet_number.to_be_bytes().into());
let mut cipher = SshChaCha20::new(&self.header_key, &packet_number.to_be_bytes().into());
cipher.apply_keystream(bytes);
}
fn decrypt_packet(&mut self, bytes: &mut [u8], packet_number: u64) {
// <https://github.com/openssh/openssh-portable/blob/1ec0a64c5dc57b8a2053a93b5ef0d02ff8598e5c/PROTOCOL.chacha20poly1305>
let mut cipher = SshChaCha20::new(&self.main_key, &packet_number.to_be_bytes().into());
let mut poly1305_key = [0; poly1305::KEY_SIZE];
cipher.apply_keystream(&mut poly1305_key);
let total_len = bytes.len();
let payload = &mut bytes[..(total_len - 16)];
// TODO: Compute it over THE LENGTH AS WELL
let hash = poly1305::Poly1305::new(&poly1305_key.into()).compute_unpadded(payload);
cipher.seek(1_u32);
todo!()
}
}