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package org.spongycastle.crypto.examples;
import java.io.*;
import java.lang.*;
import javax.microedition.midlet.MIDlet;
import javax.microedition.lcdui.*;
import org.spongycastle.util.test.*;
import org.spongycastle.util.encoders.*;
import org.spongycastle.crypto.*;
import org.spongycastle.crypto.paddings.*;
import org.spongycastle.crypto.engines.*;
import org.spongycastle.crypto.modes.*;
import org.spongycastle.crypto.params.*;
/**
* MIDP is a simple graphics application for the J2ME CLDC/MIDP.
*
* It has hardcoded values for the key and plain text. It also performs the
* standard testing for the chosen cipher, and displays the results.
*
* This example shows how to use the light-weight API and a symmetric cipher.
*
*/
public class MIDPTest extends MIDlet
{
private Display d = null;
private boolean doneEncrypt = false;
private String key = "0123456789abcdef0123456789abcdef";
private String plainText = "www.bouncycastle.org";
private byte[] keyBytes = null;
private byte[] cipherText = null;
private BufferedBlockCipher cipher = null;
private String[] cipherNames = {"DES", "DESede", "IDEA", "Rijndael", "Twofish"};
private Form output = null;
public void startApp()
{
Display.getDisplay(this).setCurrent(output);
}
public void pauseApp()
{
}
public void destroyApp(boolean unconditional)
{
}
public MIDPTest()
{
output = new Form("BouncyCastle");
output.append("Key: " + key.substring(0, 7) + "...\n");
output.append("In : " + plainText.substring(0, 7) + "...\n");
cipherText = performEncrypt(Hex.decode(key.getBytes()), plainText);
String ctS = new String(Hex.encode(cipherText));
output.append("\nCT : " + ctS.substring(0, 7) + "...\n");
String decryptText = performDecrypt(Hex.decode(key.getBytes()), cipherText);
output.append("PT : " + decryptText.substring(0, 7) + "...\n");
if (decryptText.compareTo(plainText) == 0)
{
output.append("Success");
}
else
{
output.append("Failure");
message("[" + plainText + "]");
message("[" + decryptText + "]");
}
}
private byte[] performEncrypt(byte[] key, String plainText)
{
byte[] ptBytes = plainText.getBytes();
cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(getEngineInstance()));
String name = cipher.getUnderlyingCipher().getAlgorithmName();
message("Using " + name);
cipher.init(true, new KeyParameter(key));
byte[] rv = new byte[cipher.getOutputSize(ptBytes.length)];
int oLen = cipher.processBytes(ptBytes, 0, ptBytes.length, rv, 0);
try
{
cipher.doFinal(rv, oLen);
}
catch (CryptoException ce)
{
message("Ooops, encrypt exception");
status(ce.toString());
}
return rv;
}
private String performDecrypt(byte[] key, byte[] cipherText)
{
cipher.init(false, new KeyParameter(key));
byte[] rv = new byte[cipher.getOutputSize(cipherText.length)];
int oLen = cipher.processBytes(cipherText, 0, cipherText.length, rv, 0);
try
{
cipher.doFinal(rv, oLen);
}
catch (CryptoException ce)
{
message("Ooops, decrypt exception");
status(ce.toString());
}
return new String(rv).trim();
}
private int whichCipher()
{
return 4; // DES
}
private BlockCipher getEngineInstance()
{
// returns a block cipher according to the current
// state of the radio button lists. This is only
// done prior to encryption.
BlockCipher rv = null;
switch (whichCipher())
{
case 0 :
rv = new DESEngine();
break;
case 1 :
rv = new DESedeEngine();
break;
case 2 :
rv = new IDEAEngine();
break;
case 3 :
rv = new RijndaelEngine();
break;
case 4 :
rv = new TwofishEngine();
break;
default :
rv = new DESEngine();
break;
}
return rv;
}
public void message(String s)
{
System.out.println("M:" + s);
}
public void status(String s)
{
System.out.println("S:" + s);
}
}
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