Java加密算法Triple DES

import javax.crypto.Cipher;

import javax.crypto.KeyGenerator;

import javax.crypto.SecretKey;

import javax.crypto.SecretKeyFactory;

import javax.crypto.spec.DESedeKeySpec;

import javax.crypto.spec.IvParameterSpec;

/**

三重加密 3DES也作 Triple DES, 

@author stone 
@date 2014-03-10 02:14:37 
*/

public class TripleDES {

 // 算法名稱

 public static final String KEY_ALGORITHM = "DESede";

 // 算法名稱/加密模式/填充方式

 public static final String CIPHER_ALGORITHM_ECB = "DESede/ECB/PKCS5Padding";

 public static final String CIPHER_ALGORITHM_CBC = "DESede/CBC/PKCS5Padding";
private KeyGenerator keyGen;

 private SecretKey secretKey;

 private SecretKey secretKey2;

 private Cipher cipher;

 private static byte[] encryptData;
public static void main(String[] args) throws Exception {

 TripleDES tripleDES = new TripleDES("ECB");  
 tripleDES.encrypt("sau8jzxlcvm,'123`98(*^&%^^JCB ZX>>A<S<}}{");  
 System.out.println("加密后：" + new String(encryptData));  
 System.out.println("解密后："+ new String(tripleDES.decrypt(encryptData)));  

 tripleDES = new TripleDES("CBC");  
 tripleDES.encrypt2("sau8jzxlc DQV#><«|vm,'123`98(*^&%^^JCB ZX>>A<S<}}{");  
 System.out.println("加密后：" + new String(encryptData));  
 System.out.println("解密后："+ new String(tripleDES.decrypt2(encryptData)));  

}
public TripleDES(String mode) throws Exception {

 if ("ECB".equals(mode)) {  

//          cipher = Cipher.getInstance(KEY_ALGORITHM);

     cipher = Cipher.getInstance(CIPHER_ALGORITHM_ECB);  
     keyGen = KeyGenerator.getInstance(KEY_ALGORITHM);  
     secretKey = keyGen.generateKey();  
 } else if("CBC".equals(mode)) {  
     cipher = Cipher.getInstance(CIPHER_ALGORITHM_CBC);  
     keyGen = KeyGenerator.getInstance(KEY_ALGORITHM);  
     DESedeKeySpec spec = new DESedeKeySpec(keyGen.generateKey().getEncoded());  
     secretKey2 = SecretKeyFactory.getInstance(KEY_ALGORITHM).generateSecret(spec);  
 }  

}

 /**

加密 
@param str 
@return 
@throws Exception 
*/

public byte[] encrypt(String str) throws Exception {

 cipher.init(Cipher.ENCRYPT_MODE, secretKey);

 return encryptData = cipher.doFinal(str.getBytes());

}

/** 
解密 
@param encrypt 
@return 
@throws Exception 
*/

public byte[] decrypt(byte[] encrypt) throws Exception {

 cipher.init(Cipher.DECRYPT_MODE, secretKey);

 return encryptData = cipher.doFinal(encrypt);

}

byte[] getIV() {

 return "administ".getBytes();

}

/** 
加密 
@param str 
@return 
@throws Exception 
*/

public byte[] encrypt2(String str) throws Exception {

 cipher.init(Cipher.ENCRYPT_MODE, secretKey2, new IvParameterSpec(getIV()));

 return encryptData = cipher.doFinal(str.getBytes());

}

/** 
解密 
@param encrypt 
@return 
@throws Exception 
*/

public byte[] decrypt2(byte[] encrypt) throws Exception {

 cipher.init(Cipher.DECRYPT_MODE, secretKey2, new IvParameterSpec(getIV()));

 return encryptData = cipher.doFinal(encrypt);

}

}  </pre>