aes.java

来自「a 3G milenage Javacard source code examp」· Java 代码 · 共 56 行

package crypto_milenage  ;

import javacard.framework.*;
import  javacard.security.*   ;
import  javacardx.crypto.*;


public class aes 
{   private AESKey      aeskey;
	private Cipher cipherAES  ;
	
	
  public      byte [] Out; // = new byte[BLOCK_SIZE];
	
    public aes()
    { Out = JCSystem.makeTransientByteArray((short)(16),JCSystem.CLEAR_ON_DESELECT);
	  
	  try {
	  cipherAES     = Cipher.getInstance(Cipher.ALG_AES_BLOCK_128_ECB_NOPAD, false); }
	  catch (CryptoException e){}
	  
	  try {
	  aeskey = (AESKey)KeyBuilder.buildKey(KeyBuilder.TYPE_AES,KeyBuilder.LENGTH_AES_128,false);}
	  catch (CryptoException e){}
	  
    }
   	
 public void setKey( byte[] key,short off,byte mode )
  { 
	 try{ aeskey.setKey(key,off);}
	    catch (CryptoException e){}
	   
	 if (mode == (byte)1)
	  try{cipherAES.init(aeskey, Cipher.MODE_ENCRYPT);}
		 catch (CryptoException e){}
	 
	 else
		try{cipherAES.init(aeskey, Cipher.MODE_DECRYPT);}
		 catch (CryptoException e){}
		 
  }
 
 

 
  /// Encrypt a block.
  public void encrypt( byte[] clearText, short clearOff, byte[] cipherText, short cipherOff )
  {   
	  try{cipherAES.doFinal(clearText,clearOff,(short)16,cipherText,cipherOff);}
	
	  catch (CryptoException e){}
	
  }

 } // aes