Struct XChaCha 

pub struct XChaCha<const ROUNDS: usize> { /* private fields */ }

XChaCha20 stream cipher with 24-byte (192-bit) nonce (draft-irtf-cfrg-xchacha-03).

Internally uses HChaCha20 to derive a subkey from the first 16 bytes of the nonce, then uses the IETF ChaCha20 variant with the remaining 8 nonce bytes.

Implementations

impl<const ROUNDS: usize> XChaCha<ROUNDS>

pub fn new(key: &[u8; 32], nonce: &[u8; 24]) -> XChaCha<ROUNDS>

Creates a new XChaCha stream cipher from a 32-byte key and a 24-byte nonce.

The first 16 bytes of the nonce are used with HChaCha20 to derive a subkey. The last 8 bytes of the nonce become the ChaCha20 IETF nonce (prefixed with 4 zero bytes).

pub fn set_counter(&mut self, counter: u32)

Sets the ChaCha20 block counter. Counter is a u32.

Trait Implementations

impl<const ROUNDS: usize> Drop for XChaCha<ROUNDS>

fn drop(&mut self)

Executes the destructor for this type.

fn pin_drop(self: Pin<&mut Self>)

🔬This is a nightly-only experimental API. (pin_ergonomics)

Execute the destructor for this type, but different to Drop::drop, it requires self to be pinned.

impl<const ROUNDS: usize> StreamCipher for XChaCha<ROUNDS>

fn xor_keystream(&mut self, in_out: &mut [u8])

impl<const ROUNDS: usize> Zeroize for XChaCha<ROUNDS>

fn zeroize(&mut self)

Zero out this object from memory using Rust intrinsics which ensure the zeroization operation is not “optimized away” by the compiler.