added 3des-cbc cipher support

Author: Eugeny

README.md

@@ -26,6 +26,7 @@ This is a fork of [Thrussh](https://nest.pijul.com/pijul/thrussh) by Pierre-Éti
   * `aes256-cbc` ✨
   * `aes192-cbc` ✨
   * `aes128-cbc` ✨
+  * `3des-cbc` ✨
 * Key exchanges:
   * `curve25519-sha256@libssh.org`
   * `diffie-hellman-group1-sha1` ✨

russh/Cargo.toml

@@ -62,6 +62,7 @@ tokio = { workspace = true, features = [
     "macros",
     "process",
 ] }
+des = "0.8.1"
 
 [dev-dependencies]
 anyhow = "1.0"

russh/src/cipher/mod.rs

@@ -25,6 +25,7 @@ use aes::{Aes128, Aes192, Aes256};
 use byteorder::{BigEndian, ByteOrder};
 use cbc::CbcWrapper;
 use ctr::Ctr128BE;
+use des::TdesEde3;
 use log::debug;
 use once_cell::sync::Lazy;
 use tokio::io::{AsyncRead, AsyncReadExt};
@@ -70,6 +71,8 @@ pub(crate) trait Cipher {
 
 /// `clear`
 pub const CLEAR: Name = Name("clear");
+/// `3des-cbc`
+pub const TRIPLE_DES_CBC: Name = Name("3des-cbc");
 /// `aes128-ctr`
 pub const AES_128_CTR: Name = Name("aes128-ctr");
 /// `aes192-ctr`
@@ -90,6 +93,7 @@ pub const CHACHA20_POLY1305: Name = Name("chacha20-poly1305@openssh.com");
 pub const NONE: Name = Name("none");
 
 static _CLEAR: Clear = Clear {};
+static _3DES_CBC: SshBlockCipher<CbcWrapper<TdesEde3>> = SshBlockCipher(PhantomData);
 static _AES_128_CTR: SshBlockCipher<Ctr128BE<Aes128>> = SshBlockCipher(PhantomData);
 static _AES_192_CTR: SshBlockCipher<Ctr128BE<Aes192>> = SshBlockCipher(PhantomData);
 static _AES_256_CTR: SshBlockCipher<Ctr128BE<Aes256>> = SshBlockCipher(PhantomData);
@@ -102,6 +106,7 @@ static _CHACHA20_POLY1305: SshChacha20Poly1305Cipher = SshChacha20Poly1305Cipher
 pub static ALL_CIPHERS: &[&Name] = &[
     &CLEAR,
     &NONE,
+    &TRIPLE_DES_CBC,
     &AES_128_CTR,
     &AES_192_CTR,
     &AES_256_CTR,
@@ -117,6 +122,7 @@ pub(crate) static CIPHERS: Lazy<HashMap<&'static Name, &(dyn Cipher + Send + Syn
         let mut h: HashMap<&'static Name, &(dyn Cipher + Send + Sync)> = HashMap::new();
         h.insert(&CLEAR, &_CLEAR);
         h.insert(&NONE, &_CLEAR);
+        h.insert(&TRIPLE_DES_CBC, &_3DES_CBC);
         h.insert(&AES_128_CTR, &_AES_128_CTR);
         h.insert(&AES_192_CTR, &_AES_192_CTR);
         h.insert(&AES_256_CTR, &_AES_256_CTR);