rust-elgamal

Elgamal public key cryptography implementation in Rust.

This library has been built as an exercise in implementing algorithms in Rust, and is not recommended for any production use requiring real security

API

Key generation

generate_keys - Generate Elgamal keypair

fn generate_keys(bit_size: uint) -> (PublicKey, PrivateKey)

Elgamal Encryption and Signature scheme

PublicKey is an object representing the Elgamal public key with the following methods:

encrypt - Encryption

fn encrypt(&self, m: &BigUint) -> (BigUint, BigUint)

encrypt_string - Encrypt a plaintext string

fn encrypt_string(&self, m: &str) -> String

verify - Verify signature

fn verify(&self, r: &BigUint, s: &BigUint, m: &BigUint) -> bool

verify_string - Verify signature for a string

fn verify_string(&self, sig: &str, m: &str) -> bool

PrivateKey is an object representing the Elgamal private key with the following methods:

decrypt - Decryption

fn decrypt(&self, c1: &BigUint, c2: &BigUint) -> BigUint

decrypt_string - Decrypt a ciphertext string

fn decrypt_string(&self, m: &str) -> String

sign - Signature generation

fn sign(&self, m: &BigUint) -> (BigUint, BigUint)

sign_string - Sign a string

fn sign_string(&self, sig: &str, m: &str) -> bool

Example

extern crate elgamal;

fn main() {

    let (public_key, private_key) = elgamal::generate_keys(1024);

    let plaintext = "Secret";

    let ciphertext = public_key.encrypt_string(plaintext);
    let signature = private_key.sign_string(ciphertext.as_slice());

    let decrytped_plaintext = private_key.decrypt_string(ciphertext.as_slice());
    let verified = public_key.verify_string(signature.as_slice(), ciphertext.as_slice());

    println!("Decrypted message: {}, Valid signature : {}", decrytped_plaintext, verified);
}

Building the library

Compile library:
```
cargo build
```
Run tests:
```
cargo test
```

drb/rust-elgamal

rust-elgamal

API

Key generation

Elgamal Encryption and Signature scheme

Example

Building the library