Feistel Cipher

A didactic implementation of a Feistel cipher in Rust.

⚠️ Disclaimer

This is an educational implementation and should NOT be used for real cryptographic purposes. For production use, please use well-audited cryptographic libraries like RustCrypto.

Usage

Add this to your Cargo.toml:

[dependencies]
feistel = "0.1.0"

Example

use feistel::FeistelCipher;

fn main() {
    // Create a cipher with a 64-bit key
    let cipher = FeistelCipher::new(0xDEADBEEF_CAFEBABE);

    let plaintext: u64 = 0x0123456789ABCDEF;

    // Encrypt
    let ciphertext = cipher.encrypt(plaintext);

    // Decrypt
    let decrypted = cipher.decrypt(ciphertext);

    assert_eq!(plaintext, decrypted);
}

Custom Number of Rounds

use feistel::FeistelCipher;

// Create a cipher with 32 rounds (default is 16)
let cipher = FeistelCipher::with_rounds(0xDEADBEEF_CAFEBABE, 32);

License

This project is licensed under the MIT License - see the LICENSE file for details. Contributions are welcome! Please feel free to submit a Pull Request.