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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 and up. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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package org.bouncycastle.crypto.test;

import org.bouncycastle.crypto.BlockCipher;
import org.bouncycastle.crypto.DataLengthException;
import org.bouncycastle.crypto.params.KeyParameter;
import org.bouncycastle.util.test.SimpleTest;

public abstract class CipherTest
    extends SimpleTest
{
    private SimpleTest[]      _tests;
    private BlockCipher _engine;
    private KeyParameter _validKey;

//    protected CipherTest(
//        SimpleTest[]  tests)
//    {
//        _tests = tests;
//    }

    protected CipherTest(
        SimpleTest[]   tests,
        BlockCipher  engine,
        KeyParameter validKey)
    {
        _tests = tests;
        _engine = engine;
        _validKey = validKey;
    }
    
    public abstract String getName();

    public void performTest()
        throws Exception
    {
        for (int i = 0; i != _tests.length; i++)
        {
            _tests[i].performTest();
        }

        if (_engine != null)
        {
            //
            // state tests
            //
            byte[]      buf = new byte[128];
            
            try
            {   
                _engine.processBlock(buf, 0, buf, 0);
                
                fail("failed initialisation check");
            }
            catch (IllegalStateException e)
            {
                // expected 
            }
            
            bufferSizeCheck((_engine));
        }
    }
    
    private void bufferSizeCheck(
        BlockCipher engine)
    {
        byte[] correctBuf = new byte[engine.getBlockSize()];
        byte[] shortBuf = new byte[correctBuf.length / 2];
        
        engine.init(true, _validKey);
        
        try
        {   
            engine.processBlock(shortBuf, 0, correctBuf, 0);
            
            fail("failed short input check");
        }
        catch (DataLengthException e)
        {
            // expected 
        }
        
        try
        {   
            engine.processBlock(correctBuf, 0, shortBuf, 0);
            
            fail("failed short output check");
        }
        catch (DataLengthException e)
        {
            // expected 
        }
        
        engine.init(false, _validKey);
        
        try
        {   
            engine.processBlock(shortBuf, 0, correctBuf, 0);
            
            fail("failed short input check");
        }
        catch (DataLengthException e)
        {
            // expected 
        }
        
        try
        {   
            engine.processBlock(correctBuf, 0, shortBuf, 0);
            
            fail("failed short output check");
        }
        catch (DataLengthException e)
        {
            // expected 
        }
    }
}