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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 javax.crypto.IllegalBlockSizeException;
@RunWith(JUnit4.class)
public final class IkeNormalModeCipherTest {
private static final String IKE_AUTH_INIT_REQUEST_IV = "b9132b7bb9f658dfdc648e5017a6322a";
private static final String IKE_AUTH_INIT_REQUEST_ENCRYPT_PADDED_DATA =
"030c316ce55f365760d46426ce5cfc78bd1ed9abff63eb9594c1bd58"
+ "46de333ecd3ea2b705d18293b130395300ba92a351041345"
+ "0a10525cea51b2753b4e92b081fd78d995659a98f742278f"
+ "f9b8fd3e21554865c15c79a5134d66b2744966089e416c60"
+ "a274e44a9a3f084eb02f3bdce1e7de9de8d9a62773ab563b"
+ "9a69ba1db03c752acb6136452b8a86c41addb4210d68c423"
+ "efed80e26edca5fa3fe5d0a5ca9375ce332c474b93fb1fa3"
+ "59eb4e81";
private static final String IKE_AUTH_INIT_REQUEST_UNENCRYPTED_PADDED_DATA =
"2400000c010000000a50500d2700000c010000000a505050"
+ "2100001c02000000df7c038aefaaa32d3f44b228b52a3327"
+ "44dfb2c12c00002c00000028010304032ad4c0a20300000c"
+ "0100000c800e008003000008030000020000000805000000"
+ "2d00001801000000070000100000ffff00000000ffffffff"
+ "2900001801000000070000100000ffff00000000ffffffff"
+ "29000008000040000000000c000040010000000100000000"
+ "000000000000000b";
private static final String ENCR_KEY_FROM_INIT_TO_RESP = "5cbfd33f75796c0188c4a3a546aec4a1";
private static final int AES_BLOCK_SIZE = 16;
private IkeNormalModeCipher mAesCbcCipher;
private byte[] mAesCbcKey;
private byte[] mIv;
private byte[] mEncryptedPaddedData;
private byte[] mUnencryptedPaddedData;
@Before
public void setUp() throws Exception {
mAesCbcCipher =
(IkeNormalModeCipher)
IkeCipher.create(
new EncryptionTransform(
SaProposal.ENCRYPTION_ALGORITHM_AES_CBC,
SaProposal.KEY_LEN_AES_128),
IkeMessage.getSecurityProvider());
mAesCbcKey = TestUtils.hexStringToByteArray(ENCR_KEY_FROM_INIT_TO_RESP);
mIv = TestUtils.hexStringToByteArray(IKE_AUTH_INIT_REQUEST_IV);
mEncryptedPaddedData =
TestUtils.hexStringToByteArray(IKE_AUTH_INIT_REQUEST_ENCRYPT_PADDED_DATA);
mUnencryptedPaddedData =
TestUtils.hexStringToByteArray(IKE_AUTH_INIT_REQUEST_UNENCRYPTED_PADDED_DATA);
}
@Test
public void testBuild() throws Exception {
assertFalse(mAesCbcCipher.isAead());
assertEquals(AES_BLOCK_SIZE, mAesCbcCipher.getBlockSize());
assertEquals(AES_BLOCK_SIZE, mAesCbcCipher.generateIv().length);
}
@Test
public void testGenerateRandomIv() throws Exception {
assertFalse(Arrays.equals(mAesCbcCipher.generateIv(), mAesCbcCipher.generateIv()));
}
@Test
public void testEncryptWithNormalCipher() throws Exception {
byte[] calculatedData = mAesCbcCipher.encrypt(mUnencryptedPaddedData, mAesCbcKey, mIv);
assertArrayEquals(mEncryptedPaddedData, calculatedData);
}
@Test
public void testDecryptWithNormalCipher() throws Exception {
byte[] calculatedData = mAesCbcCipher.decrypt(mEncryptedPaddedData, mAesCbcKey, mIv);
assertArrayEquals(mUnencryptedPaddedData, calculatedData);
}
@Test
public void testEncryptWithWrongKey() throws Exception {
byte[] encryptionKey = TestUtils.hexStringToByteArray(ENCR_KEY_FROM_INIT_TO_RESP + "00");
try {
mAesCbcCipher.encrypt(mEncryptedPaddedData, encryptionKey, mIv);
fail("Expected to fail due to encryption key with wrong length.");
} catch (IllegalArgumentException expected) {
}
}
@Test
public void testDecryptWithNormalCipherWithBadPad() throws Exception {
byte[] dataToDecrypt =
TestUtils.hexStringToByteArray(
IKE_AUTH_INIT_REQUEST_UNENCRYPTED_PADDED_DATA + "00");
try {
mAesCbcCipher.decrypt(dataToDecrypt, mAesCbcKey, mIv);
fail("Expected to fail when try to decrypt data with bad padding");
} catch (IllegalBlockSizeException expected) {
}
}
@Test
public void testBuildIpSecAlgorithm() throws Exception {
IpSecAlgorithm ipsecAlgorithm = mAesCbcCipher.buildIpSecAlgorithmWithKey(mAesCbcKey);
IpSecAlgorithm expectedIpSecAlgorithm =
new IpSecAlgorithm(IpSecAlgorithm.CRYPT_AES_CBC, mAesCbcKey);
assertTrue(IpSecAlgorithm.equals(expectedIpSecAlgorithm, ipsecAlgorithm));
}
@Test
public void buildIpSecAlgorithmWithInvalidKey() throws Exception {
byte[] encryptionKey = TestUtils.hexStringToByteArray(ENCR_KEY_FROM_INIT_TO_RESP + "00");
try {
mAesCbcCipher.buildIpSecAlgorithmWithKey(encryptionKey);
fail("Expected to fail due to encryption key with wrong length.");
} catch (IllegalArgumentException expected) {
}
}
}
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