Struct scicrypt::cryptosystems::curve_el_gamal::CurveElGamalPK

pub struct CurveElGamalPK {
    pub point: RistrettoPoint,
}

Encryption key for curve-based ElGamal

Fields

point: RistrettoPoint

Public key as a RistrettoPoint

Implementations

impl CurveElGamalPK

pub fn precompute(self) -> PrecomputedCurveElGamalPK

Precompute values for the encryption key to speed-up future encryptions

Trait Implementations

impl Associable<CurveElGamalPK> for CurveElGamalCiphertext

fn associate(self, public_key: &PK) -> AssociatedCiphertext<'_, Self, PK>

‘Enriches’ a ciphertext by associating it with a corresponding public key. This allows to overlead operators for homomorphic operations.

impl Clone for CurveElGamalPK

fn clone(&self) -> CurveElGamalPK

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for CurveElGamalPK

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

Formats the value using the given formatter.

impl DecryptionKey<CurveElGamalPK> for CurveElGamalSK

fn decrypt_raw(
    &self,
    _public_key: &CurveElGamalPK,
    ciphertext: &CurveElGamalCiphertext
) -> RistrettoPoint

Decrypt the ciphertext using the secret key and its related public key.

fn decrypt_identity_raw(
    &self,
    _public_key: &CurveElGamalPK,
    ciphertext: &<CurveElGamalPK as EncryptionKey>::Ciphertext
) -> bool

Returns true if the encrypted value equals the identity. This is typically faster than a full decryption.

fn decrypt(
    &self,
    ciphertext: &AssociatedCiphertext<'pk, <PK as EncryptionKey>::Ciphertext, PK>
) -> <PK as EncryptionKey>::Plaintext

Decrypt the associated ciphertext using the secret key.

fn decrypt_identity(
    &self,
    ciphertext: &AssociatedCiphertext<'pk, <PK as EncryptionKey>::Ciphertext, PK>
) -> bool

Returns true if the associated ciphertext encrypts the identity. This is typically faster than a full decryption.

impl DecryptionShare<CurveElGamalPK> for NOfNCurveElGamalShare

fn combine(
    decryption_shares: &[NOfNCurveElGamalShare],
    _public_key: &CurveElGamalPK
) -> Result<RistrettoPoint, DecryptionError>

Combine $t$ decryption shares belonging to distinct partial keys to finish decryption. It is the responsibility of the programmer to supply the right number of decryption shares to this function.

impl DecryptionShare<CurveElGamalPK> for TOfNCurveElGamalShare

fn combine(
    decryption_shares: &[TOfNCurveElGamalShare],
    _public_key: &CurveElGamalPK
) -> Result<RistrettoPoint, DecryptionError>

Combine $t$ decryption shares belonging to distinct partial keys to finish decryption. It is the responsibility of the programmer to supply the right number of decryption shares to this function.

impl<'de> Deserialize<'de> for CurveElGamalPK

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

Deserialize this value from the given Serde deserializer.

impl EncryptionKey for CurveElGamalPK

type Input = Scalar

Input is the type used to multiply additive ciphertexts or exponentiate multiplicative ciphertexts.

type Plaintext = RistrettoPoint

The type of the plaintext to be encrypted.

type Ciphertext = CurveElGamalCiphertext

The type of an encrypted plaintext, i.e. a ciphertext.

type Randomness = Scalar

The type of the randomness used.

fn encrypt_without_randomness(
    &self,
    plaintext: &<CurveElGamalPK as EncryptionKey>::Plaintext
) -> <CurveElGamalPK as EncryptionKey>::Ciphertext

WARNING: This is not a full encryption. The resulting ciphertext is completely insecure. ‘Encrypts’ the plaintext using the public key deterministically, essentially creating a trivial ciphertext. The encryption is not secure until you call randomize or randomize_with with suitable randomness.

fn randomize<R>(
    &self,
    ciphertext: <CurveElGamalPK as EncryptionKey>::Ciphertext,
    rng: &mut GeneralRng<R>
) -> <CurveElGamalPK as EncryptionKey>::Ciphertextwhere
    R: SecureRng,

Randomizes the ciphertext with the supplied rng.

fn randomize_with(
    &self,
    ciphertext: <CurveElGamalPK as EncryptionKey>::Ciphertext,
    randomness: &<CurveElGamalPK as EncryptionKey>::Randomness
) -> <CurveElGamalPK as EncryptionKey>::Ciphertext

Randomizes the ciphertext with the user supplied randomness.

fn encrypt<R>(
    &'pk self,
    plaintext: &Self::Plaintext,
    rng: &mut GeneralRng<R>
) -> AssociatedCiphertext<'pk, Self::Ciphertext, Self>where
    R: SecureRng,

Encrypt the plaintext using the public key and a cryptographic RNG and immediately associate it with the public key.

fn encrypt_raw<R>(
    &self,
    plaintext: &Self::Plaintext,
    rng: &mut GeneralRng<R>
) -> Self::Ciphertextwhere
    R: SecureRng,

Encrypt the plaintext using the public key and a cryptographic RNG.

impl HomomorphicAddition for CurveElGamalPK

fn add(
    &self,
    ciphertext_a: &<CurveElGamalPK as EncryptionKey>::Ciphertext,
    ciphertext_b: &<CurveElGamalPK as EncryptionKey>::Ciphertext
) -> <CurveElGamalPK as EncryptionKey>::Ciphertext

Combines two ciphertexts so that their decrypted value reflects some addition operation

fn mul_constant(
    &self,
    ciphertext: &<CurveElGamalPK as EncryptionKey>::Ciphertext,
    input: &<CurveElGamalPK as EncryptionKey>::Input
) -> <CurveElGamalPK as EncryptionKey>::Ciphertext

Applies some operation on a ciphertext so that the decrypted value reflects some multiplication with input

fn sub(
    &self,
    ciphertext_a: &<CurveElGamalPK as EncryptionKey>::Ciphertext,
    ciphertext_b: &<CurveElGamalPK as EncryptionKey>::Ciphertext
) -> <CurveElGamalPK as EncryptionKey>::Ciphertext

Combines two ciphertexts so that their decrypted value reflects some subtract operation

fn add_constant(
    &self,
    ciphertext: &<CurveElGamalPK as EncryptionKey>::Ciphertext,
    constant: &<CurveElGamalPK as EncryptionKey>::Plaintext
) -> <CurveElGamalPK as EncryptionKey>::Ciphertext

Combines two ciphertexts so that their decrypted value reflects some addition operation with a constant

fn sub_constant(
    &self,
    ciphertext: &<CurveElGamalPK as EncryptionKey>::Ciphertext,
    constant: &<CurveElGamalPK as EncryptionKey>::Plaintext
) -> <CurveElGamalPK as EncryptionKey>::Ciphertext

Combines two ciphertexts so that their decrypted value reflects some subtract operation with a constant

impl PartialDecryptionKey<CurveElGamalPK> for NOfNCurveElGamalSK

type DecryptionShare = NOfNCurveElGamalShare

The type of the decryption share. If enough decryption shares of different keys are combined, they output the correct decryption.

fn partial_decrypt_raw(
    &self,
    _public_key: &CurveElGamalPK,
    ciphertext: &CurveElGamalCiphertext
) -> NOfNCurveElGamalShare

Partially decrypts a ciphertext, returning a valid decryption share.

fn partial_decrypt(
    &self,
    ciphertext: &AssociatedCiphertext<'pk, <PK as EncryptionKey>::Ciphertext, PK>
) -> Self::DecryptionShare

Partially decrypts a ciphertext, returning a valid decryption share.

impl PartialDecryptionKey<CurveElGamalPK> for TOfNCurveElGamalSK

type DecryptionShare = TOfNCurveElGamalShare

The type of the decryption share. If enough decryption shares of different keys are combined, they output the correct decryption.

fn partial_decrypt_raw(
    &self,
    _public_key: &CurveElGamalPK,
    ciphertext: &CurveElGamalCiphertext
) -> TOfNCurveElGamalShare

Partially decrypts a ciphertext, returning a valid decryption share.

fn partial_decrypt(
    &self,
    ciphertext: &AssociatedCiphertext<'pk, <PK as EncryptionKey>::Ciphertext, PK>
) -> Self::DecryptionShare

Partially decrypts a ciphertext, returning a valid decryption share.

impl PartialEq<CurveElGamalPK> for CurveElGamalPK

fn eq(&self, other: &CurveElGamalPK) -> 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 Serialize for CurveElGamalPK

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

Serialize this value into the given Serde serializer.

impl Eq for CurveElGamalPK

impl StructuralEq for CurveElGamalPK

impl StructuralPartialEq for CurveElGamalPK