https://github.com/rustaceanrob/chacha20

zero dependency, stack allocated ChaCha20 implementation
https://github.com/rustaceanrob/chacha20

chacha20 cryptography stack-allocated stream-cipher

Last synced: 6 months ago
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zero dependency, stack allocated ChaCha20 implementation

• Host: GitHub
• URL: https://github.com/rustaceanrob/chacha20
• Owner: rustaceanrob
• License: mit
• Created: 2024-03-03T02:14:39.000Z (over 1 year ago)
• Default Branch: main
• Last Pushed: 2024-03-12T20:13:21.000Z (over 1 year ago)
• Last Synced: 2025-03-12T06:47:38.717Z (7 months ago)
• Topics: chacha20, cryptography, stack-allocated, stream-cipher
• Language: Rust
• Homepage: https://crates.io/crates/rust_chacha20
• Size: 10.7 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
## ChaCha20

A Rust implementation of the ChaCha20 stream cipher. Complete with simple, auditable code.

#### Features

- [x] Stack-allocated

- [x] No unsafe code blocks

- [x] Zero dependencies

- [x] Seek an index in the keystream or a block in the keystream.

#### Usage

```rust

use chacha20::ChaCha20;

let key = hex::decode("000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f").unwrap();

let key: [u8; 32] = key.try_into().unwrap();

let nonce = hex::decode("000000000000004a00000000").unwrap();

let nonce: [u8; 12] = nonce.try_into().unwrap();

let seek = 42; // start the cipher at the 42nd index

let mut chacha = ChaCha20::new(key, nonce, seek);

let mut binding = *b"Ladies and Gentlemen of the class of '99: If I could offer you only one tip for the future, sunscreen would be it.";

let to = binding.as_mut_slice();

chacha.apply_keystream(to);

chacha.seek(seek); // move the keystream index back to 42

```