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);  
    }  
}  

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