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chore: checkpoint before Python removal

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Sienna Meridian Satterwhite
2026-03-26 22:33:59 +00:00
parent 683cec9307
commit e568ddf82a
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{"files":{".cargo_vcs_info.json":"fe2b604c914802839ddd017fb940712f9481b8f04b9d2fb2efb78f810077df9c","CHANGELOG.md":"00076d3471973ada2ae351cafa44babfe4a08babdb7929a6df1686afeb362d20","Cargo.toml":"0856a9702dcb53062d8d9632583b0d41b8f533c344fed27e4d728152141f93a7","Cargo.toml.orig":"ff8acef700e97bf93da37733957d69d4b1eda8882f20f3ca04b2b2c75bf02039","LICENSE-APACHE":"a9040321c3712d8fd0b09cf52b17445de04a23a10165049ae187cd39e5c86be5","LICENSE-MIT":"df5a6e5866476bcef44f2b2e1712d123ea26e350cc0b54df253beb4333bf0aec","README.md":"63c965e419f2689293b010b843d3ba9c802309a2883090300d1dd25eb28b7ada","src/chacha20poly1305.rs":"02dca087550cb3c3217a593234847097daeeb6bd021b32dc918614486e17adb0","src/error.rs":"2bd2e625c3acc829d0cc9e86ea731b0d039ed702db5da06286f89aacea28a77a","src/lib.rs":"0e433b9b02482596f6ca3902b362bdcca74fe8a84751897b47d7159050f5aeba"},"package":"caac132742f0d33c3af65bfcde7f6aa8f62f0e991d80db99149eb9d44708784f"}

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{
"git": {
"sha1": "65d6c00c0455b9dbb03471a337922076d123fe40"
},
"path_in_vcs": "ssh-cipher"
}

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# Changelog
All notable changes to this project will be documented in this file.
The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
## 0.2.0 (2023-08-11)
- Initial release
## 0.1.0
- Skipped to synchronize versions with `ssh-encoding`

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# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
#
# When uploading crates to the registry Cargo will automatically
# "normalize" Cargo.toml files for maximal compatibility
# with all versions of Cargo and also rewrite `path` dependencies
# to registry (e.g., crates.io) dependencies.
#
# If you are reading this file be aware that the original Cargo.toml
# will likely look very different (and much more reasonable).
# See Cargo.toml.orig for the original contents.
[package]
edition = "2021"
rust-version = "1.60"
name = "ssh-cipher"
version = "0.2.0"
authors = ["RustCrypto Developers"]
description = """
Pure Rust implementation of SSH symmetric encryption including support for the
modern aes128-gcm@openssh.com/aes256-gcm@openssh.com and
chacha20-poly1305@openssh.com algorithms as well as legacy support for older
ciphers. Built on the pure Rust cryptography implementations maintained by the
RustCrypto organization.
"""
readme = "README.md"
keywords = [
"crypto",
"encryption",
"openssh",
"ssh",
]
categories = [
"cryptography",
"no-std",
]
license = "Apache-2.0 OR MIT"
repository = "https://github.com/RustCrypto/SSH/tree/master/ssh-cipher"
[package.metadata.docs.rs]
all-features = true
rustdoc-args = [
"--cfg",
"docsrs",
]
[dependencies.aes]
version = "0.8"
optional = true
default-features = false
[dependencies.aes-gcm]
version = "0.10"
features = ["aes"]
optional = true
default-features = false
[dependencies.cbc]
version = "0.1"
optional = true
[dependencies.chacha20]
version = "0.9"
optional = true
default-features = false
[dependencies.cipher]
version = "0.4"
[dependencies.ctr]
version = "0.9"
optional = true
default-features = false
[dependencies.des]
version = "0.8"
optional = true
default-features = false
[dependencies.encoding]
version = "0.2"
package = "ssh-encoding"
[dependencies.poly1305]
version = "0.8"
optional = true
default-features = false
[dependencies.subtle]
version = "2"
optional = true
default-features = false
[features]
aes-cbc = [
"dep:aes",
"dep:cbc",
]
aes-ctr = [
"dep:aes",
"dep:ctr",
]
aes-gcm = [
"dep:aes",
"dep:aes-gcm",
]
chacha20poly1305 = [
"dep:chacha20",
"dep:poly1305",
"dep:subtle",
]
std = []
tdes = [
"dep:des",
"dep:cbc",
]

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Copyright (c) 2023 The RustCrypto Project Developers
Permission is hereby granted, free of charge, to any
person obtaining a copy of this software and associated
documentation files (the "Software"), to deal in the
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The above copyright notice and this permission notice
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
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SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.

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# [RustCrypto]: SSH Symmetric Ciphers
[![crate][crate-image]][crate-link]
[![Docs][docs-image]][docs-link]
[![Build Status][build-image]][build-link]
![Apache2/MIT licensed][license-image]
![Rust Version][rustc-image]
[![Project Chat][chat-image]][chat-link]
[Documentation][docs-link]
## About
Pure Rust implementation of SSH symmetric encryption including support for the
modern `aes128-gcm@openssh.com`/`aes256-gcm@openssh.com` and
`chacha20-poly1305@openssh.com` algorithms as well as legacy support for older
ciphers.
Built on the pure Rust cryptography implementations maintained by the
[RustCrypto] organization.
## Minimum Supported Rust Version
This crate requires **Rust 1.60** at a minimum.
We may change the MSRV in the future, but it will be accompanied by a minor
version bump.
## License
Licensed under either of:
* [Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0)
* [MIT license](http://opensource.org/licenses/MIT)
at your option.
### Contribution
Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in the work by you, as defined in the Apache-2.0 license, shall be
dual licensed as above, without any additional terms or conditions.
[//]: # (badges)
[crate-image]: https://buildstats.info/crate/ssh-cipher
[crate-link]: https://crates.io/crates/ssh-cipher
[docs-image]: https://docs.rs/ssh-cipher/badge.svg
[docs-link]: https://docs.rs/ssh-cipher/
[license-image]: https://img.shields.io/badge/license-Apache2.0/MIT-blue.svg
[rustc-image]: https://img.shields.io/badge/rustc-1.60+-blue.svg
[chat-image]: https://img.shields.io/badge/zulip-join_chat-blue.svg
[chat-link]: https://rustcrypto.zulipchat.com/#narrow/stream/346919-SSH
[build-image]: https://github.com/RustCrypto/SSH/actions/workflows/ssh-cipher.yml/badge.svg
[build-link]: https://github.com/RustCrypto/SSH/actions/workflows/ssh-cipher.yml
[//]: # (links)
[RustCrypto]: https://github.com/rustcrypto
[RFC4251]: https://datatracker.ietf.org/doc/html/rfc4251

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//! OpenSSH variant of ChaCha20Poly1305: `chacha20-poly1305@openssh.com`
//!
//! Differences from ChaCha20Poly1305 as described in RFC8439:
//!
//! - Construction uses two separately keyed instances of ChaCha20: one for data, one for lengths
//! - The input of Poly1305 is not padded
//! - The lengths of ciphertext and AAD are not authenticated using Poly1305
//!
//! [PROTOCOL.chacha20poly1305]: https://cvsweb.openbsd.org/src/usr.bin/ssh/PROTOCOL.chacha20poly1305?annotate=HEAD
use crate::{Error, Nonce, Result, Tag};
use chacha20::{ChaCha20, Key};
use cipher::{KeyInit, KeyIvInit, StreamCipher, StreamCipherSeek};
use poly1305::Poly1305;
use subtle::ConstantTimeEq;
const KEY_SIZE: usize = 32;
pub(crate) struct ChaCha20Poly1305 {
cipher: ChaCha20,
mac: Poly1305,
}
impl ChaCha20Poly1305 {
/// Create a new [`ChaCha20Poly1305`] instance with a 64-byte key.
/// From [PROTOCOL.chacha20poly1305]:
///
/// > The chacha20-poly1305@openssh.com cipher requires 512 bits of key
/// > material as output from the SSH key exchange. This forms two 256 bit
/// > keys (K_1 and K_2), used by two separate instances of chacha20.
/// > The first 256 bits constitute K_2 and the second 256 bits become
/// > K_1.
/// >
/// > The instance keyed by K_1 is a stream cipher that is used only
/// > to encrypt the 4 byte packet length field. The second instance,
/// > keyed by K_2, is used in conjunction with poly1305 to build an AEAD
/// > (Authenticated Encryption with Associated Data) that is used to encrypt
/// > and authenticate the entire packet.
///
/// [PROTOCOL.chacha20poly1305]: https://cvsweb.openbsd.org/src/usr.bin/ssh/PROTOCOL.chacha20poly1305?annotate=HEAD
pub fn new(key: &[u8], nonce: &[u8]) -> Result<Self> {
#[allow(clippy::arithmetic_side_effects)]
if key.len() != KEY_SIZE * 2 {
return Err(Error::KeySize);
}
// TODO(tarcieri): support for using both keys
let (k_2, _k_1) = key.split_at(KEY_SIZE);
let key = Key::from_slice(k_2);
let nonce = if nonce.is_empty() {
// For key encryption
Nonce::default()
} else {
Nonce::try_from(nonce).map_err(|_| Error::IvSize)?
};
let mut cipher = ChaCha20::new(key, &nonce.into());
let mut poly1305_key = poly1305::Key::default();
cipher.apply_keystream(&mut poly1305_key);
let mac = Poly1305::new(&poly1305_key);
// Seek to block 1
cipher.seek(64);
Ok(Self { cipher, mac })
}
#[inline]
pub fn encrypt(mut self, buffer: &mut [u8]) -> Tag {
self.cipher.apply_keystream(buffer);
self.mac.compute_unpadded(buffer).into()
}
#[inline]
pub fn decrypt(mut self, buffer: &mut [u8], tag: Tag) -> Result<()> {
let expected_tag = self.mac.compute_unpadded(buffer);
if expected_tag.ct_eq(&tag).into() {
self.cipher.apply_keystream(buffer);
Ok(())
} else {
Err(Error::Crypto)
}
}
}

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//! Error types.
use crate::Cipher;
use core::fmt;
/// Result type with `ssh-cipher` crate's [`Error`] as the error type.
pub type Result<T> = core::result::Result<T, Error>;
/// Error type.
#[derive(Clone, Debug, Eq, PartialEq)]
#[non_exhaustive]
pub enum Error {
/// Cryptographic errors.
Crypto,
/// Invalid key size.
KeySize,
/// Invalid initialization vector / nonce size.
IvSize,
/// Invalid AEAD tag size.
TagSize,
/// Unsupported cipher.
UnsupportedCipher(Cipher),
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Error::Crypto => write!(f, "cryptographic error"),
Error::KeySize => write!(f, "invalid key size"),
Error::IvSize => write!(f, "invalid initialization vector size"),
Error::TagSize => write!(f, "invalid AEAD tag size"),
Error::UnsupportedCipher(cipher) => write!(f, "unsupported cipher: {}", cipher),
}
}
}
#[cfg(feature = "std")]
impl std::error::Error for Error {}

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#![no_std]
#![cfg_attr(docsrs, feature(doc_auto_cfg))]
#![doc = include_str!("../README.md")]
#![doc(
html_logo_url = "https://raw.githubusercontent.com/RustCrypto/media/6ee8e381/logo.svg",
html_favicon_url = "https://raw.githubusercontent.com/RustCrypto/media/6ee8e381/logo.svg"
)]
#![forbid(unsafe_code)]
#![warn(
clippy::arithmetic_side_effects,
clippy::panic,
clippy::panic_in_result_fn,
clippy::unwrap_used,
missing_docs,
rust_2018_idioms,
unused_lifetimes,
unused_qualifications
)]
#[cfg(feature = "std")]
extern crate std;
mod error;
#[cfg(feature = "chacha20poly1305")]
mod chacha20poly1305;
pub use crate::error::{Error, Result};
use core::{fmt, str};
use encoding::{Label, LabelError};
#[cfg(feature = "aes-ctr")]
use cipher::StreamCipherCore;
#[cfg(feature = "aes-gcm")]
use aes_gcm::{aead::AeadInPlace, Aes128Gcm, Aes256Gcm};
#[cfg(feature = "chacha20poly1305")]
use crate::chacha20poly1305::ChaCha20Poly1305;
#[cfg(any(feature = "aes-cbc", feature = "aes-ctr"))]
use aes::{Aes128, Aes192, Aes256};
#[cfg(any(feature = "aes-cbc", feature = "tdes"))]
use {
cbc::{Decryptor, Encryptor},
cipher::{block_padding::NoPadding, BlockCipher, BlockDecryptMut, BlockEncryptMut},
};
#[cfg(any(feature = "aes-cbc", feature = "aes-gcm", feature = "tdes"))]
use cipher::KeyInit;
#[cfg(any(feature = "aes-cbc", feature = "aes-ctr", feature = "tdes"))]
use cipher::KeyIvInit;
#[cfg(feature = "tdes")]
use des::TdesEde3;
/// AES-128 in block chaining (CBC) mode
const AES128_CBC: &str = "aes128-cbc";
/// AES-192 in block chaining (CBC) mode
const AES192_CBC: &str = "aes192-cbc";
/// AES-256 in block chaining (CBC) mode
const AES256_CBC: &str = "aes256-cbc";
/// AES-128 in counter (CTR) mode
const AES128_CTR: &str = "aes128-ctr";
/// AES-192 in counter (CTR) mode
const AES192_CTR: &str = "aes192-ctr";
/// AES-256 in counter (CTR) mode
const AES256_CTR: &str = "aes256-ctr";
/// AES-128 in Galois/Counter Mode (GCM).
const AES128_GCM: &str = "aes128-gcm@openssh.com";
/// AES-256 in Galois/Counter Mode (GCM).
const AES256_GCM: &str = "aes256-gcm@openssh.com";
/// ChaCha20-Poly1305
const CHACHA20_POLY1305: &str = "chacha20-poly1305@openssh.com";
/// Triple-DES in block chaining (CBC) mode
const TDES_CBC: &str = "3des-cbc";
/// Nonce for AEAD modes.
///
/// This is used by e.g. `aes128-gcm@openssh.com`/`aes256-gcm@openssh.com` and
/// `chacha20-poly1305@openssh.com`.
pub type Nonce = [u8; 12];
/// Authentication tag for ciphertext data.
///
/// This is used by e.g. `aes128-gcm@openssh.com`/`aes256-gcm@openssh.com` and
/// `chacha20-poly1305@openssh.com`.
pub type Tag = [u8; 16];
/// Counter mode with a 32-bit big endian counter.
#[cfg(feature = "aes-ctr")]
type Ctr128BE<Cipher> = ctr::CtrCore<Cipher, ctr::flavors::Ctr128BE>;
/// Cipher algorithms.
#[derive(Copy, Clone, Debug, Eq, Hash, PartialEq, PartialOrd, Ord)]
#[non_exhaustive]
pub enum Cipher {
/// No cipher.
None,
/// AES-128 in cipher block chaining (CBC) mode.
Aes128Cbc,
/// AES-192 in cipher block chaining (CBC) mode.
Aes192Cbc,
/// AES-256 in cipher block chaining (CBC) mode.
Aes256Cbc,
/// AES-128 in counter (CTR) mode.
Aes128Ctr,
/// AES-192 in counter (CTR) mode.
Aes192Ctr,
/// AES-256 in counter (CTR) mode.
Aes256Ctr,
/// AES-128 in Galois/Counter Mode (GCM).
Aes128Gcm,
/// AES-256 in Galois/Counter Mode (GCM).
Aes256Gcm,
/// ChaCha20-Poly1305
ChaCha20Poly1305,
/// TripleDES in block chaining (CBC) mode
TDesCbc,
}
impl Cipher {
/// Decode cipher algorithm from the given `ciphername`.
///
/// # Supported cipher names
/// - `aes256-ctr`
pub fn new(ciphername: &str) -> core::result::Result<Self, LabelError> {
ciphername.parse()
}
/// Get the string identifier which corresponds to this algorithm.
pub fn as_str(self) -> &'static str {
match self {
Self::None => "none",
Self::Aes128Cbc => AES128_CBC,
Self::Aes192Cbc => AES192_CBC,
Self::Aes256Cbc => AES256_CBC,
Self::Aes128Ctr => AES128_CTR,
Self::Aes192Ctr => AES192_CTR,
Self::Aes256Ctr => AES256_CTR,
Self::Aes128Gcm => AES128_GCM,
Self::Aes256Gcm => AES256_GCM,
Self::ChaCha20Poly1305 => CHACHA20_POLY1305,
Self::TDesCbc => TDES_CBC,
}
}
/// Get the key and IV size for this cipher in bytes.
pub fn key_and_iv_size(self) -> Option<(usize, usize)> {
match self {
Self::None => None,
Self::Aes128Cbc => Some((16, 16)),
Self::Aes192Cbc => Some((24, 16)),
Self::Aes256Cbc => Some((32, 16)),
Self::Aes128Ctr => Some((16, 16)),
Self::Aes192Ctr => Some((24, 16)),
Self::Aes256Ctr => Some((32, 16)),
Self::Aes128Gcm => Some((16, 12)),
Self::Aes256Gcm => Some((32, 12)),
Self::ChaCha20Poly1305 => Some((64, 0)),
Self::TDesCbc => Some((24, 8)),
}
}
/// Get the block size for this cipher in bytes.
pub fn block_size(self) -> usize {
match self {
Self::None | Self::ChaCha20Poly1305 | Self::TDesCbc => 8,
Self::Aes128Cbc
| Self::Aes192Cbc
| Self::Aes256Cbc
| Self::Aes128Ctr
| Self::Aes192Ctr
| Self::Aes256Ctr
| Self::Aes128Gcm
| Self::Aes256Gcm => 16,
}
}
/// Compute the length of padding necessary to pad the given input to
/// the block size.
#[allow(clippy::arithmetic_side_effects)]
pub fn padding_len(self, input_size: usize) -> usize {
match input_size % self.block_size() {
0 => 0,
input_rem => self.block_size() - input_rem,
}
}
/// Does this cipher have an authentication tag? (i.e. is it an AEAD mode?)
pub fn has_tag(self) -> bool {
matches!(
self,
Self::Aes128Gcm | Self::Aes256Gcm | Self::ChaCha20Poly1305
)
}
/// Is this cipher `none`?
pub fn is_none(self) -> bool {
self == Self::None
}
/// Is the cipher anything other than `none`?
pub fn is_some(self) -> bool {
!self.is_none()
}
/// Decrypt the ciphertext in the `buffer` in-place using this cipher.
pub fn decrypt(self, key: &[u8], iv: &[u8], buffer: &mut [u8], tag: Option<Tag>) -> Result<()> {
match self {
#[cfg(feature = "aes-cbc")]
Self::Aes128Cbc => {
if tag.is_some() {
return Err(Error::TagSize);
}
cbc_decrypt::<Aes128>(key, iv, buffer)
}
#[cfg(feature = "aes-cbc")]
Self::Aes192Cbc => {
if tag.is_some() {
return Err(Error::TagSize);
}
cbc_decrypt::<Aes192>(key, iv, buffer)
}
#[cfg(feature = "aes-cbc")]
Self::Aes256Cbc => {
if tag.is_some() {
return Err(Error::TagSize);
}
cbc_decrypt::<Aes256>(key, iv, buffer)
}
#[cfg(feature = "aes-ctr")]
Self::Aes128Ctr | Self::Aes192Ctr | Self::Aes256Ctr => {
if tag.is_some() {
return Err(Error::TagSize);
}
// Counter mode encryption and decryption are the same operation
self.encrypt(key, iv, buffer)?;
Ok(())
}
#[cfg(feature = "aes-gcm")]
Self::Aes128Gcm => {
let cipher = Aes128Gcm::new_from_slice(key).map_err(|_| Error::KeySize)?;
let nonce = Nonce::try_from(iv).map_err(|_| Error::IvSize)?;
let tag = tag.ok_or(Error::TagSize)?;
cipher
.decrypt_in_place_detached(&nonce.into(), &[], buffer, &tag.into())
.map_err(|_| Error::Crypto)?;
Ok(())
}
#[cfg(feature = "aes-gcm")]
Self::Aes256Gcm => {
let cipher = Aes256Gcm::new_from_slice(key).map_err(|_| Error::KeySize)?;
let nonce = Nonce::try_from(iv).map_err(|_| Error::IvSize)?;
let tag = tag.ok_or(Error::TagSize)?;
cipher
.decrypt_in_place_detached(&nonce.into(), &[], buffer, &tag.into())
.map_err(|_| Error::Crypto)?;
Ok(())
}
#[cfg(feature = "chacha20poly1305")]
Self::ChaCha20Poly1305 => {
let tag = tag.ok_or(Error::TagSize)?;
ChaCha20Poly1305::new(key, iv)?.decrypt(buffer, tag)
}
#[cfg(feature = "tdes")]
Self::TDesCbc => {
if tag.is_some() {
return Err(Error::TagSize);
}
cbc_decrypt::<TdesEde3>(key, iv, buffer)
}
_ => {
// Suppress unused variable warnings.
let (_, _, _, _) = (key, iv, buffer, tag);
Err(self.unsupported())
}
}
}
/// Encrypt the ciphertext in the `buffer` in-place using this cipher.
pub fn encrypt(self, key: &[u8], iv: &[u8], buffer: &mut [u8]) -> Result<Option<Tag>> {
match self {
#[cfg(feature = "aes-cbc")]
Self::Aes128Cbc => {
cbc_encrypt::<Aes128>(key, iv, buffer)?;
Ok(None)
}
#[cfg(feature = "aes-cbc")]
Self::Aes192Cbc => {
cbc_encrypt::<Aes192>(key, iv, buffer)?;
Ok(None)
}
#[cfg(feature = "aes-cbc")]
Self::Aes256Cbc => {
cbc_encrypt::<Aes256>(key, iv, buffer)?;
Ok(None)
}
#[cfg(feature = "aes-ctr")]
Self::Aes128Ctr => {
ctr_encrypt::<Ctr128BE<Aes128>>(key, iv, buffer)?;
Ok(None)
}
#[cfg(feature = "aes-ctr")]
Self::Aes192Ctr => {
ctr_encrypt::<Ctr128BE<Aes192>>(key, iv, buffer)?;
Ok(None)
}
#[cfg(feature = "aes-ctr")]
Self::Aes256Ctr => {
ctr_encrypt::<Ctr128BE<Aes256>>(key, iv, buffer)?;
Ok(None)
}
#[cfg(feature = "aes-gcm")]
Self::Aes128Gcm => {
let cipher = Aes128Gcm::new_from_slice(key).map_err(|_| Error::KeySize)?;
let nonce = Nonce::try_from(iv).map_err(|_| Error::IvSize)?;
let tag = cipher
.encrypt_in_place_detached(&nonce.into(), &[], buffer)
.map_err(|_| Error::Crypto)?;
Ok(Some(tag.into()))
}
#[cfg(feature = "aes-gcm")]
Self::Aes256Gcm => {
let cipher = Aes256Gcm::new_from_slice(key).map_err(|_| Error::KeySize)?;
let nonce = Nonce::try_from(iv).map_err(|_| Error::IvSize)?;
let tag = cipher
.encrypt_in_place_detached(&nonce.into(), &[], buffer)
.map_err(|_| Error::Crypto)?;
Ok(Some(tag.into()))
}
#[cfg(feature = "chacha20poly1305")]
Self::ChaCha20Poly1305 => {
let tag = ChaCha20Poly1305::new(key, iv)?.encrypt(buffer);
Ok(Some(tag))
}
#[cfg(feature = "tdes")]
Self::TDesCbc => {
cbc_encrypt::<TdesEde3>(key, iv, buffer)?;
Ok(None)
}
_ => {
// Suppress unused variable warnings.
let (_, _, _) = (key, iv, buffer);
Err(self.unsupported())
}
}
}
/// Create an unsupported cipher error.
fn unsupported(self) -> Error {
Error::UnsupportedCipher(self)
}
}
impl AsRef<str> for Cipher {
fn as_ref(&self) -> &str {
self.as_str()
}
}
impl Label for Cipher {}
impl fmt::Display for Cipher {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str(self.as_str())
}
}
impl str::FromStr for Cipher {
type Err = LabelError;
fn from_str(ciphername: &str) -> core::result::Result<Self, LabelError> {
match ciphername {
"none" => Ok(Self::None),
AES128_CBC => Ok(Self::Aes128Cbc),
AES192_CBC => Ok(Self::Aes192Cbc),
AES256_CBC => Ok(Self::Aes256Cbc),
AES128_CTR => Ok(Self::Aes128Ctr),
AES192_CTR => Ok(Self::Aes192Ctr),
AES256_CTR => Ok(Self::Aes256Ctr),
AES128_GCM => Ok(Self::Aes128Gcm),
AES256_GCM => Ok(Self::Aes256Gcm),
CHACHA20_POLY1305 => Ok(Self::ChaCha20Poly1305),
TDES_CBC => Ok(Self::TDesCbc),
_ => Err(LabelError::new(ciphername)),
}
}
}
#[cfg(any(feature = "aes-cbc", feature = "tdes"))]
fn cbc_encrypt<C>(key: &[u8], iv: &[u8], buffer: &mut [u8]) -> Result<()>
where
C: BlockEncryptMut + BlockCipher + KeyInit,
{
let cipher = Encryptor::<C>::new_from_slices(key, iv).map_err(|_| Error::KeySize)?;
// Since the passed in buffer is already padded, using NoPadding here
cipher
.encrypt_padded_mut::<NoPadding>(buffer, buffer.len())
.map_err(|_| Error::Crypto)?;
Ok(())
}
#[cfg(any(feature = "aes-cbc", feature = "tdes"))]
fn cbc_decrypt<C>(key: &[u8], iv: &[u8], buffer: &mut [u8]) -> Result<()>
where
C: BlockDecryptMut + BlockCipher + KeyInit,
{
let cipher = Decryptor::<C>::new_from_slices(key, iv).map_err(|_| Error::KeySize)?;
// Since the passed in buffer is already padded, using NoPadding here
cipher
.decrypt_padded_mut::<NoPadding>(buffer)
.map_err(|_| Error::Crypto)?;
Ok(())
}
#[cfg(feature = "aes-ctr")]
fn ctr_encrypt<C>(key: &[u8], iv: &[u8], buffer: &mut [u8]) -> Result<()>
where
C: StreamCipherCore + KeyIvInit,
{
let cipher = C::new_from_slices(key, iv).map_err(|_| Error::KeySize)?;
cipher
.try_apply_keystream_partial(buffer.into())
.map_err(|_| Error::Crypto)?;
Ok(())
}

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