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/*
* Copyright (C) 2019 The Android Open Source Project
*
* 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
*
* http://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.android.internal.net.ipsec.ike.crypto;
import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import android.net.IpSecAlgorithm;
import android.net.ipsec.ike.SaProposal;
import com.android.internal.net.TestUtils;
import com.android.internal.net.ipsec.ike.message.IkeMessage;
import com.android.internal.net.ipsec.ike.message.IkeSaPayload.EncryptionTransform;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
import java.util.Arrays;
import java.util.Random;
import javax.crypto.AEADBadTagException;
@RunWith(JUnit4.class)
public final class IkeCombinedModeCipherTest {
private static final String IV = "fbd69d9de2dafc5e";
private static final String ENCRYPTED_PADDED_DATA_WITH_CHECKSUM =
"f4109834e9f3559758c05edf119917521b885f67f0d14ced43";
private static final String UNENCRYPTED_PADDED_DATA = "000000080000400f00";
private static final String ADDITIONAL_AUTH_DATA =
"77c708b4523e39a471dc683c1d4f21362e202508000000060000004129000025";
private static final String KEY =
"7C04513660DEC572D896105254EF92608054F8E6EE19E79CE52AB8697B2B5F2C2AA90C29";
private static final int AES_GCM_IV_LEN = 8;
private static final int AES_GCM_16_CHECKSUM_LEN = 128;
private IkeCombinedModeCipher mAesGcm16Cipher;
private byte[] mAesGcmKey;
private byte[] mIv;
private byte[] mEncryptedPaddedDataWithChecksum;
private byte[] mUnencryptedPaddedData;
private byte[] mAdditionalAuthData;
@Before
public void setUp() {
mAesGcm16Cipher =
(IkeCombinedModeCipher)
IkeCipher.create(
new EncryptionTransform(
SaProposal.ENCRYPTION_ALGORITHM_AES_GCM_16,
SaProposal.KEY_LEN_AES_256),
IkeMessage.getSecurityProvider());
mAesGcmKey = TestUtils.hexStringToByteArray(KEY);
mIv = TestUtils.hexStringToByteArray(IV);
mEncryptedPaddedDataWithChecksum =
TestUtils.hexStringToByteArray(ENCRYPTED_PADDED_DATA_WITH_CHECKSUM);
mUnencryptedPaddedData = TestUtils.hexStringToByteArray(UNENCRYPTED_PADDED_DATA);
mAdditionalAuthData = TestUtils.hexStringToByteArray(ADDITIONAL_AUTH_DATA);
}
@Test
public void testBuild() throws Exception {
assertTrue(mAesGcm16Cipher.isAead());
assertEquals(AES_GCM_IV_LEN, mAesGcm16Cipher.generateIv().length);
}
@Test
public void testGenerateRandomIv() throws Exception {
assertFalse(Arrays.equals(mAesGcm16Cipher.generateIv(), mAesGcm16Cipher.generateIv()));
}
@Test
public void testEncrypt() throws Exception {
byte[] calculatedData =
mAesGcm16Cipher.encrypt(
mUnencryptedPaddedData, mAdditionalAuthData, mAesGcmKey, mIv);
assertArrayEquals(mEncryptedPaddedDataWithChecksum, calculatedData);
}
@Test
public void testDecrypt() throws Exception {
byte[] calculatedData =
mAesGcm16Cipher.decrypt(
mEncryptedPaddedDataWithChecksum, mAdditionalAuthData, mAesGcmKey, mIv);
assertArrayEquals(mUnencryptedPaddedData, calculatedData);
}
@Test
public void testEncryptWithWrongKeyLen() throws Exception {
byte[] encryptionKey = TestUtils.hexStringToByteArray(KEY + "00");
try {
mAesGcm16Cipher.encrypt(
mUnencryptedPaddedData, mAdditionalAuthData, encryptionKey, mIv);
fail("Expected to fail because encryption key has wrong length.");
} catch (IllegalArgumentException expected) {
}
}
@Test
public void testDecrypWithWrongKey() throws Exception {
byte[] encryptionKey = new byte[mAesGcmKey.length];
new Random().nextBytes(encryptionKey);
try {
mAesGcm16Cipher.decrypt(
mEncryptedPaddedDataWithChecksum, mAdditionalAuthData, encryptionKey, mIv);
fail("Expected to fail because decryption key is wrong");
} catch (AEADBadTagException expected) {
}
}
@Test
public void testBuildIpSecAlgorithm() throws Exception {
IpSecAlgorithm ipsecAlgorithm = mAesGcm16Cipher.buildIpSecAlgorithmWithKey(mAesGcmKey);
IpSecAlgorithm expectedIpSecAlgorithm =
new IpSecAlgorithm(
IpSecAlgorithm.AUTH_CRYPT_AES_GCM, mAesGcmKey, AES_GCM_16_CHECKSUM_LEN);
assertTrue(IpSecAlgorithm.equals(expectedIpSecAlgorithm, ipsecAlgorithm));
}
@Test
public void buildIpSecAlgorithmWithInvalidKey() throws Exception {
byte[] encryptionKey = TestUtils.hexStringToByteArray(KEY + "00");
try {
mAesGcm16Cipher.buildIpSecAlgorithmWithKey(encryptionKey);
fail("Expected to fail because encryption key has wrong length.");
} catch (IllegalArgumentException expected) {
}
}
}
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