Struct elastic_elgamal::sharing::PublicKeySet

pub struct PublicKeySet<G: Group> { /* private fields */ }

Full public information about the participants of a threshold ElGamal encryption scheme after all participants’ commitments are collected.

Implementations

impl<G: Group> PublicKeySet<G>

pub fn new( params: Params, public_polynomial: Vec<G::Element>, proof_of_possession: &ProofOfPossession<G> ) -> Result<Self, Error>

Creates an instance based on information provided by the Dealer.

Errors

Returns an error if the information provided by the dealer is malformed.

pub fn from_participants( params: Params, participant_keys: Vec<PublicKey<G>> ) -> Result<Self, Error>

Creates a key set from the parameters and public keys of all participants.

Errors

Returns an error if the number of keys in participant_keys does not match the number of participants in params, or if participant_keys are inconsistent (do not correspond to a single shared key).

pub fn params(&self) -> Params

Returns parameters for this scheme.

pub fn shared_key(&self) -> &PublicKey<G>

Returns the shared public key used in this scheme.

pub fn participant_key(&self, index: usize) -> Option<&PublicKey<G>>

Returns the public key of a participant with the specified index. If index is out of bounds, returns None.

pub fn participant_keys(&self) -> &[PublicKey<G>]

Returns the slice with all participants’ public keys.

pub fn verify_participant( &self, index: usize, proof: &ProofOfPossession<G> ) -> Result<(), VerificationError>

Verifies a proof of possession of the participant’s secret key.

Proofs of possession for participants are not required for protocol correctness. Still, they can be useful to attribute failures or just as an additional safety mechanism; see the module docs for details.

Panics

Panics if index does not correspond to a participant.

Errors

Returns an error if the proof does not verify.

pub fn verify_share( &self, candidate_share: CandidateDecryption<G>, ciphertext: Ciphertext<G>, index: usize, proof: &LogEqualityProof<G> ) -> Result<VerifiableDecryption<G>, VerificationError>

Verifies a candidate decryption share for ciphertext provided by a participant with the specified index.

Errors

Returns an error if the proof does not verify.

Trait Implementations

impl<G: Clone + Group> Clone for PublicKeySet<G>

fn clone(&self) -> PublicKeySet<G>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<G: Debug + Group> Debug for PublicKeySet<G>

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

Formats the value using the given formatter.

impl<'de, G: Group> Deserialize<'de> for PublicKeySet<G>

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<G: Group> Serialize for PublicKeySet<G>

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>where __S: Serializer,

Serialize this value into the given Serde serializer.