fn main() -> Result<(), Box<dyn Error>> {
    tink_daead::init();
    let kh = tink_core::keyset::Handle::new(&tink_daead::aes_siv_key_template())?;
    let d = tink_daead::new(&kh)?;

    let pt = b"this data needs to be encrypted";
    let ad = b"additional data";
    let ct1 = d.encrypt_deterministically(pt, ad)?;
    println!("'{}' => {}", String::from_utf8_lossy(pt), hex::encode(&ct1));

    let ct2 = d.encrypt_deterministically(pt, ad)?;
    assert_eq!(ct1, ct2, "cipher texts are not equal");
    println!("Cipher texts are equal.");

    let pt2 = d.decrypt_deterministically(&ct1, ad)?;
    assert_eq!(&pt[..], pt2);
    Ok(())
}