1/*
2 * Copyright (C) 2009 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *     http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package tests.security;
18
19import java.security.AlgorithmParameters;
20import java.security.InvalidAlgorithmParameterException;
21import java.security.InvalidKeyException;
22import java.security.Key;
23import java.security.NoSuchAlgorithmException;
24import java.util.Arrays;
25import javax.crypto.BadPaddingException;
26import javax.crypto.Cipher;
27import javax.crypto.IllegalBlockSizeException;
28import javax.crypto.KeyGenerator;
29import javax.crypto.NoSuchPaddingException;
30import junit.framework.Assert;
31
32public class AlgorithmParameterSymmetricHelper extends TestHelper<AlgorithmParameters> {
33
34    private static final String plainData = "some data to encrypt and decrypt";
35    private final String algorithmName;
36    private final int keySize;
37    private String blockmode;
38
39    public AlgorithmParameterSymmetricHelper(String algorithmName, int keySize) {
40        this.algorithmName = algorithmName;
41        this.keySize = keySize;
42    }
43
44    public AlgorithmParameterSymmetricHelper(String algorithmName, String blockmode, int keySize) {
45        this(algorithmName, keySize);
46        this.blockmode = blockmode;
47    }
48
49    @Override
50    public void test(AlgorithmParameters parameters) throws Exception {
51        KeyGenerator generator = KeyGenerator.getInstance(algorithmName);
52        generator.init(keySize);
53
54        Key key = generator.generateKey();
55        String transformation = algorithmName;
56        if (blockmode != null)
57        {
58            transformation += "/" + blockmode;
59        }
60
61        Cipher cipher = Cipher.getInstance(transformation);
62        cipher.init(Cipher.ENCRYPT_MODE, key, parameters);
63        byte[] bs = cipher.doFinal(plainData.getBytes());
64
65        cipher.init(Cipher.DECRYPT_MODE, key, parameters);
66        byte[] decrypted = cipher.doFinal(bs);
67
68        Assert.assertTrue(Arrays.equals(plainData.getBytes(), decrypted));
69    }
70}
71