Struct SigningKey 

#[repr(C)]
pub struct SigningKey {
    pub public_key: PublicKey,
    pub(crate) k: Scalar,
}

A SigningKey is used to sign a BlindedToken and verify an UnblindedToken.

This is a server secret and should NEVER be revealed to the client.

Fields

public_key: PublicKey

A PublicKey showing a committment to this particular key

k: Scalar

k is the actual key

Implementations

impl SigningKey

pub fn random<T: Rng + CryptoRng>(rng: &mut T) -> Self

Generates a new random SigningKey using the provided random number generator.

pub fn from_random_bytes(bytes: &[u8]) -> Result<SigningKey, TokenError>

Construct a SigningKey from 64 random bytes.

The random bytes MUST be cryptographically strong, uniform random bytes such as those output from a CSPRNG or appropriately seeded KDF.

pub fn sign(&self, P: &BlindedToken) -> Result<SignedToken, TokenError>

Signs the provided BlindedToken

Returns None if the BlindedToken point is not valid.

pub fn rederive_unblinded_token(&self, t: &TokenPreimage) -> UnblindedToken

Rederives an UnblindedToken via the token preimage of the provided UnblindedToken

W’ = T^k = H_1(t)^k

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

Convert this SigningKey to a byte array.

fn bytes_length_error() -> TokenError

pub fn from_bytes(bytes: &[u8]) -> Result<SigningKey, TokenError>

Construct a SigningKey from a slice of bytes.

Trait Implementations

impl Clone for SigningKey

fn clone(&self) -> SigningKey

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SigningKey

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

Formats the value using the given formatter.

impl Drop for SigningKey

Overwrite signing key with null when it goes out of scope.

fn drop(&mut self)

Executes the destructor for this type.