Struct VrfStruct 

pub struct VrfStruct<Curve, Hasher> {
    pub curve: Curve,
    pub hasher: Hasher,
    pub suite_id: u8,
}

Fields

curve: Curve

hasher: Hasher

suite_id: u8

ECVRF suite string as specific by RFC9381

Implementations

impl<C, D> VrfStruct<C, D>

where C: Curve + CurveArithmetic, C::FieldBytesSize: ModulusSize,

pub const fn cofactor(&self) -> Scalar<C>

Curve cofactor, i.e., number of points on EC divided by prime order of group G.

impl<C, D> VrfStruct<C, D>

where C: CurveArithmetic, C::FieldBytesSize: ModulusSize, C::AffinePoint: FromEncodedPoint<C>, C::ProjectivePoint: ToEncodedPoint<C> + CofactorGroup, D: Digest + BlockSizeUser + FixedOutput<OutputSize = C::FieldBytesSize> + FixedOutputReset,

pub fn prove(&self, secret_key: &[u8], alpha: &[u8]) -> Result<Vec<u8>>

Generates a VRF proof from a secret key and message. Spec: ECVRF_prove function (section 5.1).

Arguments

• x - A slice representing the secret key in octets.
• alpha - A slice representing the message in octets.

Returns

• If successful, a vector of octets representing the proof of the VRF.

pub fn verify( &self, public_key: &[u8], pi: &[u8], alpha: &[u8], ) -> Result<GenericArray<u8, C::FieldBytesSize>>

Verifies the provided VRF proof and computes the VRF hash output. Spec: ECVRF_verify function (section 5.2).

Arguments

• y - A slice representing the public key in octets.
• pi - A slice of octets representing the VRF proof.
• alpha - A slice containing the input data, to be hashed.

Returns

• If successful, a vector of octets with the VRF hash output.

pub fn proof_to_hash( &self, pi: &[u8], ) -> Result<GenericArray<u8, C::FieldBytesSize>>

Function to compute VRF hash output for a given proof. Spec: ECVRF_proof_to_hash function (steps 4-to 7).

Arguments

• proof - A vector of octets representing the proof of the VRF

Returns

• A vector of octets with the VRF hash output.

impl<C: Default, D: Default> VrfStruct<C, D>

pub fn new(suite_id: u8) -> Self