Enum Error 

#[non_exhaustive]
pub enum Error {
    WeakSharedSecret,
    KeyDerivation,
    Decrypt,
    OutOfOrder,
    SequenceExhausted,
    MalformedFrame,
}

Errors produced by the sealed channel.

This crate never panics on attacker-controlled input; every fallible operation returns one of these variants instead.

Note: this type intentionally does not implement std::error::Error because the crate is #![no_std].

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

WeakSharedSecret

The supplied Diffie-Hellman shared secret is all-zero.

X25519 produces an all-zero output for low-order points (RFC 7748), which would make the resulting keys predictable; such a secret is rejected with a constant-time check.

KeyDerivation

The HKDF key-derivation step failed (e.g. an expand length error).

Decrypt

AEAD decryption (authentication) failed: the frame was tampered with, the keys do not match, or the nonce/AAD did not correspond.

OutOfOrder

A frame arrived with a sequence number other than the next expected one (replay or reordering).

SequenceExhausted

The 64-bit sequence counter is exhausted. The channel fails closed rather than wrapping or reusing a nonce.

MalformedFrame

A frame was too short, or did not begin with the expected magic byte.

Trait Implementations

impl Clone for Error

fn clone(&self) -> Error

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Error

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

Formats the value using the given formatter.

impl Display for Error

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

Formats the value using the given formatter.

impl PartialEq for Error

fn eq(&self, other: &Error) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for Error

impl StructuralPartialEq for Error