Crate c2_chacha

Pure Rust ChaCha with SIMD optimizations.

Stream-cipher usage:

#[cfg(features = "std")]
fn demo() {
extern crate c2_chacha;

use c2_chacha::stream_cipher::{NewStreamCipher, SyncStreamCipher, SyncStreamCipherSeek};
use c2_chacha::{ChaCha20, ChaCha12};

let key = b"very secret key-the most secret.";
let iv = b"my nonce";
let plaintext = b"The quick brown fox jumps over the lazy dog.";

let mut buffer = plaintext.to_vec();
// create cipher instance
let mut cipher = ChaCha20::new_var(key, iv).unwrap();
// apply keystream (encrypt)
cipher.apply_keystream(&mut buffer);
// and decrypt it back
cipher.seek(0);
cipher.apply_keystream(&mut buffer);
// stream ciphers can be used with streaming messages
let mut cipher = ChaCha12::new_var(key, iv).unwrap();
for chunk in buffer.chunks_mut(3) {
    cipher.apply_keystream(chunk);
}
}

Modules

guts

stream_cipher

Traits which define functionality of stream ciphers.

Type Definitions

ChaCha8

Similar to ChaCha20, but with fewer rounds for higher performance.

ChaCha12

Similar to ChaCha20, but with fewer rounds for higher performance.

ChaCha20

ChaCha20, as used in several standards; from Bernstein’s original publication.

Ietf

IETF RFC 7539 ChaCha. Unsuitable for messages longer than 256 GiB.

XChaCha8

Constructed analogously to XChaCha20, but with fewer rounds for higher performance; mixes during initialization to support both a long nonce and a full-length (64-bit) block counter.

XChaCha12

Constructed analogously to XChaCha20, but with fewer rounds for higher performance; mixes during initialization to support both a long nonce and a full-length (64-bit) block counter.

XChaCha20

Constructed analogously to XSalsa20; mixes during initialization to support both a long nonce and a full-length (64-bit) block counter.