[dependencies]
kuznechik = "0.2.0"

fn hello_world() {
    // Инициализация
    let gamma = vec![0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xce, 0xf0, 0xa1, 0xb2, 0xc3, 0xd4, 0xe5, 0xf0, 0x01, 0x12,
                     0x23, 0x34, 0x45, 0x56, 0x67, 0x78, 0x89, 0x90, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19];
    let kuz = Kuznechik::new("Кузнечик на Rust").unwrap();
    let mut alg = AlgOfb::new(&kuz);
    alg.gamma = gamma.clone();
    let data = String::from("Hello World!").into_bytes();
    // Шифрование
    let enc_data = alg.encrypt(data.clone());
    println!("Encrypted data:\n{:?}", &enc_data);
    // Расшифрование
    alg.gamma = gamma;
    let dec_data = alg.decrypt(enc_data);
    println!(
        "Decrypted data:\n{}",
        String::from_utf8(dec_data.clone()).unwrap()
    );
    assert_eq!(dec_data, data);
}

pub fn encrypt_block(data: &mut Block128, keys: &[Block128; 10]) {
    for i in 0..9 {
        tfm_lsx(data, &keys[i]);
    }
    tfm_x(data, &keys[9]);
}

fn tfm_lsx(data: &mut Block128, key: &Block128) {
    tfm_x(data, key);
    tfm_s(data);
    tfm_l(data);
}

fn tfm_x(data: &mut Block128, key: &Block128) {
    for i in 0..16 {
        data[i] ^= key[i];
    }
}

fn tfm_s(data: &mut Block128) {
    for i in 0..16 {
        data[i] = K_PI[data[i] as usize];
    }
}

fn tfm_l(data: &mut Block128) {
    for _ in 0..16 {
        tfm_r(data);
    }
}

fn tfm_r(data: &mut Block128) {
    let temp = trf_linear(data);
    data.rotate_right(1);
    data[0] = temp;
}

fn trf_linear(data: &Block128) -> u8 {
    // indexes:  0,  1,   2,   3,   4,   5,   6
    // values:  16, 32, 133, 148, 192, 194, 251
    let mut res = 0u8;
    res ^= MULT_TABLE[3][data[0] as usize];
    res ^= MULT_TABLE[1][data[1] as usize];
    res ^= MULT_TABLE[2][data[2] as usize];
    res ^= MULT_TABLE[0][data[3] as usize];
    res ^= MULT_TABLE[5][data[4] as usize];
    res ^= MULT_TABLE[4][data[5] as usize];
    res ^= data[6];
    res ^= MULT_TABLE[6][data[7] as usize];
    res ^= data[8];
    res ^= MULT_TABLE[4][data[9] as usize];
    res ^= MULT_TABLE[5][data[10] as usize];
    res ^= MULT_TABLE[0][data[11] as usize];
    res ^= MULT_TABLE[2][data[12] as usize];
    res ^= MULT_TABLE[1][data[13] as usize];
    res ^= MULT_TABLE[3][data[14] as usize];
    res ^= data[15];
    res
}