Trait fast_paillier::AnyEncryptionKey

source ·

pub trait AnyEncryptionKey: Sealed {
    // Required methods
    fn n(&self) -> &Integer;
    fn nn(&self) -> &Integer;
    fn half_n(&self) -> &Integer;
    fn encrypt_with(
        &self,
        x: &Plaintext,
        nonce: &Nonce
    ) -> Result<Ciphertext, Error>;
    fn oadd(
        &self,
        c1: &Ciphertext,
        c2: &Ciphertext
    ) -> Result<Ciphertext, Error>;
    fn osub(
        &self,
        c1: &Ciphertext,
        c2: &Ciphertext
    ) -> Result<Ciphertext, Error>;
    fn omul(
        &self,
        scalar: &Integer,
        ciphertext: &Ciphertext
    ) -> Result<Ciphertext, Error>;
    fn oneg(&self, ciphertext: &Ciphertext) -> Result<Ciphertext, Error>;
    fn in_signed_group(&self, x: &Integer) -> bool;
}

Expand description

Any key capable of encryption

Both encryption and decryption keys can be used to carry out encryption. Moreover, encryption using decryption key is faster.

Example

This trait can be used, for instance, to accept an encryption key as an argument to the function and benefit from faster encryption if decryption key is provided.

use fast_paillier::{AnyEncryptionKey, Error};
use rug::Integer;

// This function accepts both encryption and decryption key. If decryption key is provided,
// it'll be more efficient
fn some_function(ek: &dyn AnyEncryptionKey) -> Result<Integer, Error> {
    // ...
    let ciphertext = ek.encrypt_with(&x, &r)?;
    Ok(ciphertext)
}