Struct X448 

pub struct X448;

X448 Diffie-Hellman key agreement (RFC 7748 §5).

• my_secret: 56-byte scalar (clamped per RFC 7748)
• their_public: 56-byte Montgomery-form public point
• shared_out: must be at least 56 bytes; receives the shared secret

Low-order public keys are rejected with CryptoError::Kex.

Trait Implementations

impl Clone for X448

fn clone(&self) -> X448

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for X448

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

Formats the value using the given formatter.

impl Default for X448

fn default() -> X448

Returns the “default value” for a type.

impl KeyAgreement for X448

fn agree( &self, my_secret: &[u8], their_public: &[u8], shared_out: &mut [u8], ) -> Result<(), CryptoError>

Perform X448 DH and write the 56-byte shared secret into shared_out.

Errors

Returns CryptoError::InvalidKey if either my_secret or their_public is not exactly 56 bytes, and CryptoError::Kex if their_public is a low-order point or the resulting shared secret is all-zero.

fn name(&self) -> &'static str

Human-readable algorithm identifier (e.g. "X25519").

fn scalar_len(&self) -> usize

Length of the scalar (private key) in bytes.

fn point_len(&self) -> usize

Length of the public point in bytes.

fn shared_secret_len(&self) -> usize

Length of the shared secret in bytes.

fn agree_to_vec( &self, my_secret: &[u8], their_public: &[u8], ) -> Result<Vec<u8>, CryptoError>

Convenience: perform ECDH and return the shared secret as a Vec<u8>.

impl Copy for X448