Home | History | Annotate | Download | only in security 
      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 
     17 package tests.security;
     18 
     19 import java.security.AlgorithmParameters;
     20 import java.security.InvalidAlgorithmParameterException;
     21 import java.security.InvalidKeyException;
     22 import java.security.Key;
     23 import java.security.NoSuchAlgorithmException;
     24 import java.util.Arrays;
     25 import javax.crypto.BadPaddingException;
     26 import javax.crypto.Cipher;
     27 import javax.crypto.IllegalBlockSizeException;
     28 import javax.crypto.KeyGenerator;
     29 import javax.crypto.NoSuchPaddingException;
     30 import junit.framework.Assert;
     31 
     32 public 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