Struct tor_llcrypto::pk::ed25519::ExpandedKeypair

pub struct ExpandedKeypair { /* private fields */ }

A variant of Keypair containing an ExpandedSecretKey.

In the Tor protocol, we use this type for blinded onion service identity keys (KS_hs_blind_id). Since their scalar values are computed, rather than taken directly from a SHA-512 transformation of a SecretKey, we cannot use the regular Keypair type.

Implementations

impl ExpandedKeypair

pub fn public(&self) -> &PublicKey

Return the public part of this expanded keypair.

pub fn sign(&self, message: &[u8]) -> Signature

Compute a signature over a message using this keypair.

pub fn to_secret_key_bytes(&self) -> [u8; 64]

Return a representation of the secret key in this keypair.

(Since it is an expanded secret key, we represent it as its scalar part followed by its hash_prefix.)

pub fn from_secret_key_bytes(bytes: [u8; 64]) -> Option<Self>

Reconstruct a key from its byte representation as returned by to_secret_key_bytes().

Return None if the input cannot be the output of to_secret_key_bytes().

Trait Implementations

impl<'a> From<&'a SigningKey> for ExpandedKeypair

fn from(kp: &'a Keypair) -> ExpandedKeypair

Converts to this type from the input type.