elgamal-curve25519's Introduction

elgamal-curve25519

ElGamal homomorphic encryption on Curve25519.

NOTES:

The API may change (error management, more options on the homomorphic side, idk).
nightly only to ensure some level of constant-time-ness. More info here and here.

Install

To install the library add in your Cargo.toml:

# Cargo.toml

[dependencies]
elgamal-curve25519 = "0.1"

Usage

To use the library just add in the root of your crate:

// root_file_name.rs

extern crate elgamal_curve25519; // old style
// or just use `use`, which can be used in any file of your project
use elgamal_curve25519; // new style

You can read the docs and the tests for more information on how to use it in practice.

License

This project is license under either of

Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contributing

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in elgamal-curve25519 by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.

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elgamal-curve25519's Issues

Fix field names in CypherText to_bytes function

In the implementation block for CypherText, the to_bytes implementation is using gamma twice. This needs to be gamma and delta, as this will cause incorrect byte representation.

broken build

error[E0277]: the trait bound `D: std::default::Default` is not satisfied
   --> src/lib.rs:198:40
    |
196 |         where D: Digest<OutputSize = U64>
    |                                          - help: consider further restricting type parameter `D`: `, D: std::default::Default`
197 |     {
198 |         let scalar = Scalar::from_hash(digest).reduce();
    |                                        ^^^^^^ the trait `std::default::Default` is not implemented for `D`
    | 
   ::: /home/user/.cargo/registry/src/github.com-1ecc6299db9ec823/curve25519-dalek-1.1.3/src/scalar.rs:602:45
    |
602 |         where D: Digest<OutputSize = U64> + Default
    |                                             ------- required by this bound in `curve25519_dalek::scalar::Scalar::from_hash`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0277`.
error: could not compile `elgamal-curve25519`.

To learn more, run the command again with --verbose.

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