Struct chain_vote::tally::EncryptedTally

pub struct EncryptedTally {
    r: Vec<Ciphertext>,
    fingerprint: ElectionFingerprint,
    max_stake: u64,
}

EncryptedTally is formed by one ciphertext per existing option and a fingerprint that identifies the election parameters used (crs and election public key)

Fields

r: Vec<Ciphertext>

fingerprint: ElectionFingerprint

max_stake: u64

Implementations

impl EncryptedTally

const MAX_STAKE_BYTES_LEN: usize = 8usize

pub fn new(options: usize, election_pk: ElectionPublicKey, crs: Crs) -> Self

Initialise a new tally with N different options. The EncryptedTally is computed using the additive homomorphic property of the elgamal Ciphertexts, and is therefore initialised with zero ciphertexts.

pub fn to_base64(&self) -> String

Returns base64 representation of EncryptedTally

pub fn from_base_64(encrypted_tally_b64: String) -> Result<Self, Box<dyn Error>>

Generate EncryptedTally type from base64 representation

Errors

• Base64DecodeError

pub fn add(&mut self, ballot: &Ballot, weight: u64)

Add a submitted ballot, with a specific weight to the tally. Remember that a vote is only valid for a specific election (i.e. pair of election public key and crs), and trying to add a ballot validated for a different one will result in a panic.

Note that the encrypted vote needs to have the exact same number of options as the initialised tally, otherwise an assert will trigger.

pub fn partial_decrypt<R: RngCore + CryptoRng>( &self, rng: &mut R, secret_key: &OpeningVoteKey ) -> TallyDecryptShare

Given a single committee member’s secret_key, returns a partial decryption of the EncryptedTally

pub fn validate_partial_decryptions( &self, pks: &[MemberPublicKey], decrypt_shares: &[TallyDecryptShare] ) -> Result<ValidatedTally, DecryptionError>

Given the members pks, and their corresponding decrypte_shares, this function validates the different shares, and returns a ValidatedTally, or a DecryptionError.

pub fn to_bytes(&self) -> Vec<u8>

Returns a byte array with every ciphertext in the EncryptedTally

pub fn from_bytes(bytes: &[u8]) -> Option<Self>

Tries to generate an EncryptedTally out of an array of bytes. Returns None if the size of the byte array is not a multiply of Ciphertext::BYTES_LEN.

Trait Implementations

impl Add<EncryptedTally> for EncryptedTally

type Output = EncryptedTally

The resulting type after applying the + operator.

fn add(self, rhs: Self) -> Self::Output

Performs the + operation.

impl Clone for EncryptedTally

fn clone(&self) -> EncryptedTally

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for EncryptedTally

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

Formats the value using the given formatter.

impl PartialEq<EncryptedTally> for EncryptedTally

fn eq(&self, other: &EncryptedTally) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for EncryptedTally

impl StructuralEq for EncryptedTally

impl StructuralPartialEq for EncryptedTally