Struct StreamOpener 

pub struct StreamOpener {
    cipher: ChaChaPoly1305<StreamCipherCoreWrapper<XChaChaCore<R20>>, UInt<UInt<UInt<UInt<UInt<UTerm, B1>, B1>, B0>, B0>, B0>>,
    nonce_prefix: [u8; 16],
    chunk_size: usize,
    aad: Vec<u8>,
    counter: u64,
    finished: bool,
}

Incremental decryption of one file’s content stream.

Fields

cipher: ChaChaPoly1305<StreamCipherCoreWrapper<XChaChaCore<R20>>, UInt<UInt<UInt<UInt<UInt<UTerm, B1>, B1>, B0>, B0>, B0>>

nonce_prefix: [u8; 16]

chunk_size: usize

aad: Vec<u8>

counter: u64

finished: bool

Implementations

impl StreamOpener

pub fn new(header: &FileHeader, key: &SecureKey) -> StreamOpener

pub fn chunk_ciphertext_len(&self) -> usize

Ciphertext bytes to feed per StreamOpener::open_chunk call; only the final chunk may be shorter.

pub fn open_chunk( &mut self, ciphertext: &[u8], is_last: bool, ) -> Result<SecureBytes, FileError>

Opens the next chunk. is_last marks that no more ciphertext follows; sealing and opening must agree on which chunk is final or authentication fails (this is what detects truncation).

pub fn finished(&self) -> bool

True once the final chunk has been opened. A stream that ends without this being true was truncated.