Struct ChaCha20Poly1305Stream 

pub struct ChaCha20Poly1305Stream { /* private fields */ }

STREAM chunked AEAD using XChaCha20-Poly1305.

Nonce layout: 19-byte prefix ‖ 4-byte counter (big-endian) ‖ 1-byte flag.

Provide a 19-byte prefix to init.

Trait Implementations

impl Debug for ChaCha20Poly1305Stream

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl StreamingAead for ChaCha20Poly1305Stream

fn init(key: &[u8], nonce: &[u8], aad: &[u8]) -> Result<Self, CryptoError>

Initialise the stream.

nonce must be exactly 19 bytes (XChaCha20 nonce prefix).

fn encrypt_update( &mut self, chunk: &[u8], out: &mut [u8], ) -> Result<usize, CryptoError>

Feed a plaintext chunk; write ciphertext bytes into out. Returns the number of bytes written.

fn encrypt_finalize(self, out: &mut [u8]) -> Result<[u8; 16], CryptoError>

Flush remaining ciphertext into out and return the 16-byte authentication tag.

fn decrypt_update( &mut self, chunk: &[u8], out: &mut [u8], ) -> Result<usize, CryptoError>

Feed a ciphertext chunk; write plaintext bytes into out. Returns the number of bytes written.

fn decrypt_finalize(self, expected_tag: &[u8]) -> Result<(), CryptoError>

Verify expected_tag in constant time and flush remaining plaintext.

fn reset(&mut self)

Reset to initial (un-initialised) state for reuse.