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      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) {
     51 
     52         KeyGenerator generator = null;
     53         try {
     54             generator = KeyGenerator.getInstance(algorithmName);
     55         } catch (NoSuchAlgorithmException e) {
     56             Assert.fail(e.getMessage());
     57         }
     58 
     59         generator.init(keySize);
     60 
     61         Key key = generator.generateKey();
     62 
     63 
     64         Cipher cipher = null;
     65         try {
     66             String transformation = algorithmName;
     67             if (blockmode != null)
     68             {
     69                 transformation += "/" + blockmode;
     70             }
     71             cipher = Cipher.getInstance(transformation);
     72         } catch (NoSuchAlgorithmException e) {
     73             Assert.fail(e.getMessage());
     74         } catch (NoSuchPaddingException e) {
     75             Assert.fail(e.getMessage());
     76         }
     77 
     78         try {
     79             cipher.init(Cipher.ENCRYPT_MODE, key, parameters);
     80         } catch (InvalidKeyException e) {
     81             Assert.fail(e.getMessage());
     82         } catch (InvalidAlgorithmParameterException e) {
     83             Assert.fail(e.getMessage());
     84         }
     85 
     86         byte[] bs = null;
     87         try {
     88             bs = cipher.doFinal(plainData.getBytes());
     89         } catch (IllegalBlockSizeException e) {
     90             Assert.fail(e.getMessage());
     91         } catch (BadPaddingException e) {
     92             Assert.fail(e.getMessage());
     93         }
     94 
     95         try {
     96             cipher.init(Cipher.DECRYPT_MODE, key, parameters);
     97         } catch (InvalidKeyException e) {
     98             Assert.fail(e.getMessage());
     99         } catch (InvalidAlgorithmParameterException e) {
    100             Assert.fail(e.getMessage());
    101         }
    102 
    103         byte[] decrypted = null;
    104         try {
    105             decrypted = cipher.doFinal(bs);
    106         } catch (IllegalBlockSizeException e) {
    107             Assert.fail(e.getMessage());
    108         } catch (BadPaddingException e) {
    109             Assert.fail(e.getMessage());
    110         }
    111 
    112         Assert.assertTrue(Arrays.equals(plainData.getBytes(), decrypted));
    113     }
    114 }
    115