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// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.security.cryptauth.lib.securegcm;
import com.google.security.cryptauth.lib.securegcm.SecureGcmProto.Tickle;
import com.google.security.cryptauth.lib.securegcm.TransportCryptoOps.Payload;
import com.google.security.cryptauth.lib.securegcm.TransportCryptoOps.PayloadType;
import com.google.security.cryptauth.lib.securemessage.PublicKeyProtoUtil;
import java.security.KeyPair;
import java.security.PublicKey;
import java.util.Arrays;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import junit.framework.TestCase;
/**
* Android compatible tests for the {@link TransportCryptoOps} class.
*/
public class TransportCryptoOpsTest extends TestCase {
private static final byte[] KEY_BYTES = {
1, 2, 3, 4, 5, 6, 7, 8, 9, 0,
1, 2, 3, 4, 5, 6, 7, 8, 9, 0,
1, 2, 3, 4, 5, 6, 7, 8, 9, 0,
1, 2
};
private static final byte[] KEY_HANDLE = { 9 };
private SecretKey masterKey;
@Override
protected void setUp() throws Exception {
KeyEncodingTest.installSunEcSecurityProviderIfNecessary();
masterKey = new SecretKeySpec(KEY_BYTES, "AES");
super.setUp();
}
public void testServerMessage() throws Exception {
long tickleExpiry = 12345L;
Tickle tickle = Tickle.newBuilder()
.setExpiryTime(tickleExpiry)
.build();
// Simulate sending a message
byte[] signcryptedMessage = TransportCryptoOps.signcryptServerMessage(
new Payload(PayloadType.TICKLE, tickle.toByteArray()),
masterKey,
KEY_HANDLE);
// Simulate the process of receiving the message
assertTrue(Arrays.equals(KEY_HANDLE, TransportCryptoOps.getKeyHandleFor(signcryptedMessage)));
Payload received = TransportCryptoOps.verifydecryptServerMessage(signcryptedMessage, masterKey);
assertEquals(PayloadType.TICKLE, received.getPayloadType());
Tickle receivedTickle = Tickle.parseFrom(received.getMessage());
assertEquals(tickleExpiry, receivedTickle.getExpiryTime());
}
public void testClientMessage() throws Exception {
if (PublicKeyProtoUtil.isLegacyCryptoRequired()) {
return; // This test isn't for legacy crypto
}
KeyPair userKeyPair = PublicKeyProtoUtil.generateEcP256KeyPair();
doTestClientMessageWith(userKeyPair);
}
public void testClientMessageWithLegacyCrypto() throws Exception {
KeyPair userKeyPair = PublicKeyProtoUtil.generateRSA2048KeyPair();
doTestClientMessageWith(userKeyPair);
}
private void doTestClientMessageWith(KeyPair userKeyPair) throws Exception {
PublicKey userPublicKey = userKeyPair.getPublic();
// Will use a Tickle for the test message, even though that would normally
// only be sent from the server to the client
long tickleExpiry = 12345L;
Tickle tickle = Tickle.newBuilder()
.setExpiryTime(tickleExpiry)
.build();
// Simulate sending a message
byte[] signcryptedMessage = TransportCryptoOps.signcryptClientMessage(
new Payload(PayloadType.TICKLE, tickle.toByteArray()),
userKeyPair,
masterKey);
// Simulate the process of receiving the message
byte[] encodedUserPublicKey = TransportCryptoOps.getEncodedUserPublicKeyFor(signcryptedMessage);
assertTrue(Arrays.equals(KeyEncoding.encodeUserPublicKey(userPublicKey), encodedUserPublicKey));
userPublicKey = KeyEncoding.parseUserPublicKey(encodedUserPublicKey);
// At this point the server would have looked up the masterKey for this userPublicKey
Payload received = TransportCryptoOps.verifydecryptClientMessage(
signcryptedMessage, userPublicKey, masterKey);
assertEquals(PayloadType.TICKLE, received.getPayloadType());
Tickle receivedTickle = Tickle.parseFrom(received.getMessage());
assertEquals(tickleExpiry, receivedTickle.getExpiryTime());
}
}
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