Struct MetaKey 

pub struct MetaKey(/* private fields */);

Private-metadata key (K5): real filename and informational size.

A distinct type, not PayloadKey, despite identical length and derivation method. This module’s promise that “swapping arguments in a key-schedule call becomes a compile error” did not cover K3/K5: both derivations returned PayloadKey, silently accepting a metadata key where a payload key belonged. Domain separation still held (different labels, different values), so no silent vulnerability arose, but the claimed protection exceeded the actual protection, exactly the case for which these types exist.

Implementations

impl MetaKey

pub fn from_bytes(bytes: [u8; 32]) -> Self

Take ownership of existing bytes.

pub fn random<R: CryptoRng + ?Sized>(rng: &mut R) -> Self

Generate using the supplied RNG.

The RNG is passed as an argument, not obtained from the environment: otherwise tests cease to be deterministic, and Wycheproof vectors cannot exercise our own call sites.

pub fn expose(&self) -> &[u8; 32]

Expose bytes. Deliberately verbose: the call must stand out during code reading and review.

Trait Implementations

impl Clone for MetaKey

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for MetaKey

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

Formats the value using the given formatter.

impl Drop for MetaKey

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 Zeroize for MetaKey

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.