import dev.o1c.jcryptobox.JCryptoBox;

import java.nio.charset.StandardCharsets;
import java.security.KeyPair;
import java.security.SecureRandom;

class Example {
    static void sealedBox() {
        KeyPair alice = JCryptoBox.generateKeyPair();
        byte[] message = "Hello, Alice!".getBytes(StandardCharsets.UTF_8);
        byte[] sealedBox = JCryptoBox.sealing(alice.getPublic()).seal(message);

        byte[] decrypted = JCryptoBox.unsealing(alice).unseal(sealedBox);
    }

    static void boxFactory() {
        KeyPair alice = JCryptoBox.generateKeyPair();
        KeyPair bob = JCryptoBox.generateKeyPair();

        // nonce can be any length but can only be used once per key
        byte[] nonce = new byte[16];
        SecureRandom random = SecureRandom.getInstanceStrong();
        random.nextBytes(nonce);
        // or some sequential source with networking, etc.
        byte[] message1 = "Hello, Bob! ~Alice".getBytes(StandardCharsets.UTF_8);
        byte[] box1 = JCryptoBox.boxing(alice, bob.getPublic()).box(nonce, message1);
        byte[] decrypted1 = JCryptoBox.opening(bob, alice.getPublic()).open(nonce, box1);

        random.nextBytes(nonce);
        byte[] message2 = "Greetings, Alice! ~Bob".getBytes(StandardCharsets.UTF_8);
        byte[] box2 = JCryptoBox.boxing(bob, alice.getPublic()).box(nonce, message2);
        byte[] decrypted2 = JCryptoBox.opening(alice, bob.getPublic()).open(nonce, box2);
    }
}