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Java 24: Quantum-resistant ML-KEM and ML-DSA (JEP 496, 497) #123

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Java 24: Quantum-resistant ML-KEM and ML-DSA (JEP 496, 497) #123

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56 changes: 56 additions & 0 deletions JavaReleases/src/test/java/pl/mperor/lab/java/Java24.java
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,9 @@
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import java.nio.charset.StandardCharsets;
import java.security.KeyPairGenerator;
import java.security.Signature;
import java.util.HashSet;
import java.util.List;
import java.util.concurrent.CountDownLatch;
Expand All @@ -26,6 +29,7 @@
import java.util.stream.Gatherers;
import java.util.stream.IntStream;
import java.util.stream.Stream;
import javax.crypto.KEM;

/// Java 24 (March 2025)
/// [JDK 24](https://openjdk.org/projects/jdk/24)
Expand Down Expand Up @@ -239,4 +243,56 @@ public void testTransformDropsMethod() throws IOException {
Assertions.assertFalse(remainingMethods.contains("add"));
Assertions.assertTrue(remainingMethods.contains("greet"));
}

@Test
public void testMlKemEncapsulationSharesSameSecret() throws Exception {
var receiverKeys = KeyPairGenerator.getInstance("ML-KEM-768").generateKeyPair();
var kem = KEM.getInstance("ML-KEM-768");

var encapsulator = kem.newEncapsulator(receiverKeys.getPublic());
var encapsulated = encapsulator.encapsulate();
var senderSecret = encapsulated.key();

var decapsulator = kem.newDecapsulator(receiverKeys.getPrivate());
var receiverSecret = decapsulator.decapsulate(encapsulated.encapsulation());

// the sender never transmits the secret itself, only the encapsulation; both sides derive
// the same SecretKey bytes from it independently.
Assertions.assertArrayEquals(senderSecret.getEncoded(), receiverSecret.getEncoded());
}

@Test
public void testMlDsaSignatureVerifiesForGenuineMessage() throws Exception {
var keys = KeyPairGenerator.getInstance("ML-DSA-65").generateKeyPair();
var message = "John Doe approved the transfer".getBytes(StandardCharsets.UTF_8);

var signer = Signature.getInstance("ML-DSA-65");
signer.initSign(keys.getPrivate());
signer.update(message);
var signature = signer.sign();

var verifier = Signature.getInstance("ML-DSA-65");
verifier.initVerify(keys.getPublic());
verifier.update(message);

Assertions.assertTrue(verifier.verify(signature));
}

@Test
public void testMlDsaSignatureRejectsTamperedMessage() throws Exception {
var keys = KeyPairGenerator.getInstance("ML-DSA-65").generateKeyPair();
var original = "John Doe approved the transfer".getBytes(StandardCharsets.UTF_8);
var tampered = "John Doe approved the deletion".getBytes(StandardCharsets.UTF_8);

var signer = Signature.getInstance("ML-DSA-65");
signer.initSign(keys.getPrivate());
signer.update(original);
var signature = signer.sign();

var verifier = Signature.getInstance("ML-DSA-65");
verifier.initVerify(keys.getPublic());
verifier.update(tampered);

Assertions.assertFalse(verifier.verify(signature));
}
}
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