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Merged
zzambers merged 1 commit into from
Mar 12, 2025
Merged

KEMTests: comment and cosmetic changes #81

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38 changes: 29 additions & 9 deletions cryptotest/tests/KEMTests.java
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Original file line number Diff line number Diff line change
Expand Up @@ -89,22 +89,22 @@ public static Object encapsulator_encapsulate(Object e) throws Exception {
return m.invoke(e);
}

public static Object encapsulated_encapsulation(Object e) throws Exception {
public static byte[] encapsulated_encapsulation(Object e) throws Exception {
Class c = Class.forName("javax.crypto.KEM$Encapsulated");
Method m = c.getDeclaredMethod("encapsulation");
return m.invoke(e);
return (byte[]) m.invoke(e);
}

public static Object encapsulated_key(Object e) throws Exception {
public static SecretKey encapsulated_key(Object e) throws Exception {
Class c = Class.forName("javax.crypto.KEM$Encapsulated");
Method m = c.getDeclaredMethod("key");
return m.invoke(e);
return (SecretKey) m.invoke(e);
}

public static Object decapsulator_decapsulate(Object d, Object o) throws Exception {
public static SecretKey decapsulator_decapsulate(Object d, Object o) throws Exception {
Class c = Class.forName("javax.crypto.KEM$Decapsulator");
Method m = c.getDeclaredMethod("decapsulate", byte[].class);
return m.invoke(d, o);
return (SecretKey) m.invoke(d, o);
}

@Override
Expand All @@ -122,15 +122,35 @@ protected void checkAlgorithm(Provider.Service service, String alias) throws Alg
KeyPair kp = kpg.generateKeyPair();
Object sender = kem_newEncapsulator(kem, kp.getPublic());
Object encapsulated = encapsulator_encapsulate(sender);
Object encapsulation = encapsulated_encapsulation(encapsulated);
SecretKey k1 = (SecretKey) encapsulated_key(encapsulated);
byte[] encapsulation = encapsulated_encapsulation(encapsulated);
SecretKey k1 = encapsulated_key(encapsulated);

Object receiver = kem_newDecapsulator(kem, kp.getPrivate());
SecretKey k2 = (SecretKey) decapsulator_decapsulate(receiver, encapsulation);
SecretKey k2 = decapsulator_decapsulate(receiver, encapsulation);

if (!Arrays.equals(k1.getEncoded(), k2.getEncoded())) {
throw new Exception("Keys are not equal");
}

/*
Code above uses reflection, so that it is buildable on all jdks,
It is equivalent to following code:

KEM kem = KEM.getInstance(alias, service.getProvider());
KeyPairGenerator kpg = null;
... per algorithm key generator selection here ...
KeyPair kp = kpg.generateKeyPair();
KEM.Encapsulator sender = kem.newEncapsulator(kp.getPublic());
KEM.Encapsulated encapsulated = sender.encapsulate();
byte[] encapsulation = encapsulated.encapsulation();
SecretKey k1 = encapsulated.key();
KEM.Decapsulator receiver = kem.newDecapsulator(kp.getPrivate());
SecretKey k2 = receiver.decapsulate(encapsulation);
if (!Arrays.equals(k1.getEncoded(), k2.getEncoded())) {
throw new Exception("Keys are not equal");
}

*/
} catch (AlgorithmIgnoredException aie) {
throw aie;
} catch (NoSuchAlgorithmException ex) {
Expand Down