Struct Context 

pub struct Context<'k, 'v, K> {
    pub(crate) key: &'k K,
    pub(crate) value: &'v [u8],
}

Ed448 contexts as used by Ed448ph.

Contexts are domain separator strings that can be used to isolate uses of the algorithm between different protocols (which is very hard to reliably do otherwise) and between different uses within the same protocol.

To create a context, call either of the following:

• SigningKey::with_context
• VerifyingKey::with_context

Fields

key: &'k K

value: &'v [u8]

Implementations

impl<'k, 'v, K> Context<'k, 'v, K>

pub const MAX_LENGTH: usize = 255

Maximum length of a context string.

pub fn key(&self) -> &'k K

Borrow the key

pub fn value(&self) -> &'v [u8]

Borrow the value

Trait Implementations

impl<'k, 'v, K: Clone> Clone for Context<'k, 'v, K>

fn clone(&self) -> Context<'k, 'v, K>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'k, 'v, K: Debug> Debug for Context<'k, 'v, K>

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

Formats the value using the given formatter.

impl<D> DigestSigner<D, Signature> for Context<'_, '_, SigningKey>

where D: Default + FixedOutput + HashMarker + Update,

fn try_sign_digest<F: Fn(&mut D) -> Result<(), Error>>( &self, f: F, ) -> Result<Signature, Error>

Attempt to sign a message by updating the received Digest with it, returning a digital signature on success, or an error if something went wrong.

fn sign_digest<F>(&self, f: F) -> S

where F: Fn(&mut D),

Sign a message by updating the received Digest with it, returning a signature.

impl<D> DigestVerifier<D, Signature> for Context<'_, '_, VerifyingKey>

where D: Default + FixedOutput + HashMarker + Update,

fn verify_digest<F: Fn(&mut D) -> Result<(), Error>>( &self, f: F, signature: &Signature, ) -> Result<(), Error>

Verify the signature against the received Digest output, by updating it with the message.

impl PrehashSigner<Signature> for Context<'_, '_, SigningKey>

fn sign_prehash(&self, prehash: &[u8]) -> Result<Signature, Error>

Attempt to sign the given message digest, returning a digital signature on success, or an error if something went wrong.

impl Signer<Signature> for Context<'_, '_, SigningKey>

fn try_sign(&self, msg: &[u8]) -> Result<Signature, Error>

Attempt to sign the given message, returning a digital signature on success, or an error if something went wrong.

fn sign(&self, msg: &[u8]) -> S

Sign the given message and return a digital signature.

impl Verifier<Signature> for Context<'_, '_, VerifyingKey>

fn verify(&self, msg: &[u8], signature: &Signature) -> Result<(), Error>

Use Self (e.g. a verifying key) to verify that the provided signature is authentic for a given message bytestring.

impl<'k, 'v, K: Copy> Copy for Context<'k, 'v, K>