chore: checkpoint before Python removal

vendor/des/src/lib.rs

@@ -0,0 +1,33 @@
+//! Pure Rust implementation of the [Data Encryption Standard][DES] (DES),
+//! including [Triple DES] (TDES, 3DES) block ciphers.
+//!
+//! # ⚠️ Security Warning: Hazmat!
+//!
+//! This crate implements only the low-level block cipher function, and is intended
+//! for use for implementing higher-level constructions *only*. It is NOT
+//! intended for direct use in applications.
+//!
+//! USE AT YOUR OWN RISK!
+//!
+//! [DES]: https://en.wikipedia.org/wiki/Data_Encryption_Standard
+//! [Triple DES]: https://en.wikipedia.org/wiki/Triple_DES
+
+#![no_std]
+#![doc(
+    html_logo_url = "https://raw.githubusercontent.com/RustCrypto/media/26acc39f/logo.svg",
+    html_favicon_url = "https://raw.githubusercontent.com/RustCrypto/media/26acc39f/logo.svg",
+    html_root_url = "https://docs.rs/des/0.8.1"
+)]
+#![deny(unsafe_code)]
+#![cfg_attr(docsrs, feature(doc_cfg))]
+#![warn(missing_docs, rust_2018_idioms)]
+#![allow(clippy::clone_on_copy)] // TODO: remove on migration to const generics
+
+pub use cipher;
+
+mod consts;
+mod des;
+mod tdes;
+
+pub use crate::des::Des;
+pub use crate::tdes::{TdesEde2, TdesEde3, TdesEee2, TdesEee3};