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/*
 * @test
 * @bug 8379433
 * @summary Test expected DecapsulateException thrown by Hybrid KEM implementation
 * @modules java.base/sun.security.ssl
 * @run main/othervm TestHybrid
*/
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.Provider;
import java.util.Arrays;
import javax.crypto.DecapsulateException;
import javax.crypto.KEM;

public class TestHybrid {

    public static void main(String[] args) throws Exception {

        Class<?> clazz = Class.forName("sun.security.ssl.HybridProvider");
        Provider p = (Provider) clazz.getField("PROVIDER").get(null);

        String alg = "X25519MLKEM768";
        KeyPairGenerator kpg = KeyPairGenerator.getInstance(alg, p);
        KeyPair kp = kpg.generateKeyPair();

        KEM kem = KEM.getInstance(alg, p);
        KEM.Encapsulator e = kem.newEncapsulator(kp.getPublic());
        KEM.Decapsulator d = kem.newDecapsulator(kp.getPrivate());

        int secretSize = e.secretSize();
        KEM.Encapsulated enc = e.encapsulate();
        byte[] ciphertext = enc.encapsulation();

        byte[] badCiphertext = Arrays.copyOf(ciphertext,
                ciphertext.length - 1);
        try {
            d.decapsulate(badCiphertext, 0, secretSize, "Generic");
            throw new RuntimeException(
                    "Expected DecapsulateException not thrown");
        } catch (DecapsulateException expected) {
            System.out.println("Expected DecapsulateException thrown");
        }
    }
}