Struct Attribute 

pub struct Attribute {
    pub value: GroupElement,
}

An attribute (in the background, this is a GroupElement), which should not be identifiable and can be encrypted and rekeyed, but not reshuffled.

Fields

value: GroupElement

Methods from Deref<Target = GroupElement>

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

Convert to a 32-byte array.

Any GroupElement can be converted this way.

pub fn to_lizard(&self) -> Option<[u8; 16]>

Convert to a 16-byte string using the lizard approach.

Notice that a Ristretto point is represented as 32 bytes with ~2^252 valid points, so only a very small fraction of points (only those created from lizard) can be converted this way.

pub fn to_hex(&self) -> String

Convert to a hexadecimal string.

Trait Implementations

impl BatchEncryptable for Attribute

Available on crate feature batch only.

fn preprocess_batch(items: &[Self]) -> Result<Vec<Self>, BatchError>

impl Clone for Attribute

fn clone(&self) -> Attribute

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Attribute

impl Debug for Attribute

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

Formats the value using the given formatter.

impl Deref for Attribute

type Target = GroupElement

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl<'de> Deserialize<'de> for Attribute

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl ElGamalEncryptable for Attribute

fn value(&self) -> &GroupElement

Get the GroupElement plaintext value.

fn from_value(value: GroupElement) -> Self

where Self: Sized,

Create from a GroupElement.

fn from_point(value: GroupElement) -> Self

where Self: Sized,

Create from a GroupElement.

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

where Self: Sized,

Create with a random value.

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

Encode as a byte array of length 32. See GroupElement::to_bytes.

fn to_hex(&self) -> String

Convert to a hexadecimal string of 64 characters.

fn from_bytes(bytes: &[u8; 32]) -> Option<Self>

where Self: Sized,

Create from a byte array of length 32. Returns None if the input is not a valid encoding of a GroupElement.

fn from_slice(slice: &[u8]) -> Option<Self>

where Self: Sized,

Create from a slice of bytes. Returns None if the input is not a valid encoding of a GroupElement.

fn from_hex(hex: &str) -> Option<Self>

where Self: Sized,

Create from a hexadecimal string. Returns None if the input is not a valid encoding of a GroupElement.

fn from_hash(hash: &[u8; 64]) -> Self

where Self: Sized,

Create from a hash value. See GroupElement::from_hash.

fn from_lizard(data: &[u8; 16]) -> Self

where Self: Sized,

Create from a byte array of length 16 using lizard encoding. This is useful for creating a pseudonym from an existing identifier or encoding attributes, as it accepts any 16-byte value. See GroupElement::from_lizard.

fn to_lizard(&self) -> Option<[u8; 16]>

Encode as a byte array of length 16 using lizard encoding. Returns None if the point is not a valid lizard encoding of a 16-byte value. See GroupElement::to_lizard. If the value was created using ElGamalEncryptable::from_lizard, this will return a valid value, but otherwise it will most likely return None.

impl Encryptable for Attribute

type EncryptedType = EncryptedAttribute

The encrypted version of this type.

type PublicKeyType = AttributeSessionPublicKey

The session public key type required for encryption.

type GlobalPublicKeyType = AttributeGlobalPublicKey

The global public key type required for offline encryption.

fn encrypt<R>( &self, public_key: &Self::PublicKeyType, rng: &mut R, ) -> Self::EncryptedType

where R: Rng + CryptoRng,

Encrypt this value using a session key.

fn encrypt_global<R>( &self, public_key: &Self::GlobalPublicKeyType, rng: &mut R, ) -> Self::EncryptedType

where R: Rng + CryptoRng,

Encrypt this value using a global key (offline encryption).

impl Eq for Attribute

impl From<GroupElement> for Attribute

fn from(value: GroupElement) -> Self

Converts to this type from the input type.

impl Hash for Attribute

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Padded for Attribute

fn from_bytes_padded(data: &[u8]) -> Result<Self, Error>

where Self: Sized,

Encodes an arbitrary byte array using PKCS#7 padding.

fn from_string_padded(text: &str) -> Result<Self, Error>

where Self: Sized,

Encodes a string using PKCS#7 padding.

fn to_string_padded(&self) -> Result<String, Error>

Decodes back to the original string.

fn to_bytes_padded(&self) -> Result<Vec<u8>, Error>

Decodes back to the original byte array.

impl PartialEq for Attribute

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

Tests for self and other values to be equal, and is used by ==.

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

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

impl Serialize for Attribute

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Attribute