chacha rust sample

Cargo.toml

[package]
name = "chacha"
version = "0.1.0"
edition = "2021"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
"chacha20poly1305" = "0.10.1"

main.rs

use chacha20poly1305::{
    aead::{Aead, AeadCore, KeyInit, OsRng},
    ChaCha20Poly1305
};

fn main() -> Result<(), Box<dyn std::error::Error>>{
    let key = ChaCha20Poly1305::generate_key(&mut OsRng);
    let cipher = ChaCha20Poly1305::new(&key);
    let nonce = ChaCha20Poly1305::generate_nonce(&mut OsRng); // 96-bits; unique per message
    let ciphertext = cipher.encrypt(&nonce, b"plaintext message".as_ref()).unwrap();
    let plaintext = cipher.decrypt(&nonce, ciphertext.as_ref()).unwrap();
    assert_eq!(&plaintext, b"plaintext message");
    Ok(())
}