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 Aliases

• 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.