rust_sodium 0.10.2

Fast cryptographic library for Rust (bindings to libsodium)
Documentation 
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//! The original ChaCha20-Poly1305 construction can safely encrypt a pratically
//! unlimited number of messages with the same key, without any practical limit
//! to the size of a message (up to ~ 2^64 bytes).

use crate::ffi::{
    crypto_aead_chacha20poly1305_ABYTES, crypto_aead_chacha20poly1305_KEYBYTES,
    crypto_aead_chacha20poly1305_NPUBBYTES, crypto_aead_chacha20poly1305_decrypt,
    crypto_aead_chacha20poly1305_decrypt_detached, crypto_aead_chacha20poly1305_encrypt,
    crypto_aead_chacha20poly1305_encrypt_detached,
};
aead_module!(
    crypto_aead_chacha20poly1305_encrypt,
    crypto_aead_chacha20poly1305_decrypt,
    crypto_aead_chacha20poly1305_encrypt_detached,
    crypto_aead_chacha20poly1305_decrypt_detached,
    crypto_aead_chacha20poly1305_KEYBYTES as usize,
    crypto_aead_chacha20poly1305_NPUBBYTES as usize,
    crypto_aead_chacha20poly1305_ABYTES as usize
);

#[cfg(test)]
mod test {
    use super::*;

    #[test]
    #[rustfmt::skip]
    fn test_vector_1() {
        // Test from https://tools.ietf.org/html/draft-agl-tls-chacha20poly1305-04#section-7
        unwrap!(crate::init());
        let m = &[0x86, 0xd0, 0x99, 0x74, 0x84, 0x0b, 0xde, 0xd2, 0xa5, 0xca];
        let k = Key([
            0x42, 0x90, 0xbc, 0xb1, 0x54, 0x17, 0x35, 0x31, 0xf3, 0x14, 0xaf, 0x57, 0xf3, 0xbe,
            0x3b, 0x50, 0x06, 0xda, 0x37, 0x1e, 0xce, 0x27, 0x2a, 0xfa, 0x1b, 0x5d, 0xbd, 0xd1,
            0x10, 0x0a, 0x10, 0x07]);
        let n = Nonce([0xcd, 0x7c, 0xf6, 0x7b, 0xe3, 0x9c, 0x79, 0x4a]);
        let ad = &[0x87, 0xe2, 0x29, 0xd4, 0x50, 0x08, 0x45, 0xa0, 0x79, 0xc0];

        let c_expected = &[0xe3, 0xe4, 0x46, 0xf7, 0xed, 0xe9, 0xa1, 0x9b, 0x62, 0xa4, 0x67,
            0x7d, 0xab, 0xf4, 0xe3, 0xd2, 0x4b, 0x87, 0x6b, 0xb2, 0x84, 0x75, 0x38, 0x96, 0xe1,
            0xd6];

        let c = seal(m, Some(ad), &n, &k);
        assert_eq!(&c[..], c_expected);
    }
}