Struct Ciphertext 

pub struct Ciphertext(/* private fields */);

An encrypted message.

Ciphertexts are created by encrypting a message with a PublicKey and can be decrypted using the corresponding SecretKey.

Security

Always call Ciphertext::verify before processing a ciphertext from an untrusted source to prevent chosen-ciphertext attacks. The SecretKey::decrypt method performs this check automatically.

Known Limitations

Plaintext length is not hidden. The ciphertext v component is an XOR-encrypted byte string of exactly the same length as the plaintext. An observer can therefore determine the exact length of any encrypted message from the ciphertext size alone. If message length is sensitive in your protocol, pad all messages to a uniform length before encrypting.

Example

use threshold_pairing::SecretKey;

let sk = SecretKey::random();
let pk = sk.public_key();

let message = b"secret message";
let ciphertext = pk.encrypt(message);

// Verify the ciphertext is valid
assert!(ciphertext.verify());

let decrypted = sk.decrypt(&ciphertext).unwrap();
assert_eq!(message.to_vec(), decrypted);

Implementations

impl Ciphertext

pub fn verify(&self) -> bool

Returns true if this is a valid ciphertext. This check is necessary to prevent chosen-ciphertext attacks. Implementation treats ciphertexts with either u or v as the identity point as invalid.

Trait Implementations

impl Clone for Ciphertext

fn clone(&self) -> Ciphertext

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Ciphertext

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Ciphertext

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Hash for Ciphertext

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 Ord for Ciphertext

fn cmp(&self, other: &Self) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Ciphertext

fn eq(&self, other: &Ciphertext) -> 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 PartialOrd for Ciphertext

fn partial_cmp(&self, other: &Self) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Serialize for Ciphertext

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Eq for Ciphertext

impl StructuralPartialEq for Ciphertext