对称加密算法(2)：3DES

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3DES 的实现方式：jdk 的实现 ， BouncyCastle 的实现方式 

    /**
	 * jdk 3DES 生成秘钥 
	 * @return
	 * @throws Exception
	 */
	public static byte [] JDK_3DES_GetSecretKey() throws Exception{
		KeyGenerator keyGenerator = KeyGenerator.getInstance("DESede");
		keyGenerator.init(168);  // 秘钥的长度 ,可使用 new SecureRandom() 生成默认长度的秘钥
		SecretKey secretKey = keyGenerator.generateKey();
		return secretKey.getEncoded();
	}
	
	/**
	 * 使用 3des 对数据进行加密 
	 * @param src
	 * @param encryptKey
	 * @return
	 * @throws Exception
	 */
	public static byte [] JDK_3DES_Encrypt(String src,byte [] encryptKey) throws Exception{
		//Key 的转换
		DESedeKeySpec keySpec = new DESedeKeySpec(encryptKey);
		SecretKeyFactory factory = SecretKeyFactory.getInstance("DESede");
		Key secretKey = factory.generateSecret(keySpec);
		
		//加密
		Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");
		cipher.init(Cipher.ENCRYPT_MODE, secretKey);
		byte [] result = cipher.doFinal(src.getBytes());
		return result;
	}
	
	/**
	 * 使用 3des 对数据进行解密 
	 * @param encryptBytes
	 * @param encryptKey
	 * @return
	 * @throws Exception
	 */
	public static String JDK_3DES_Decrypt(byte [] encryptBytes ,byte [] encryptKey) throws Exception{
		//Key 的转换
		DESedeKeySpec keySpec = new DESedeKeySpec(encryptKey);
		SecretKeyFactory factory = SecretKeyFactory.getInstance("DESede");
		Key secretKey = factory.generateSecret(keySpec);
		
		//解密
		Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");
		cipher.init(Cipher.DECRYPT_MODE, secretKey);
		String result = new String(cipher.doFinal(encryptBytes));
		return result;
	}
	
	/**
	 * bc 3DES 生成秘钥 
	 * @return
	 * @throws Exception
	 */
	public static byte [] BC_3DES_GetSecretKey() throws Exception{
		Security.addProvider(new BouncyCastleProvider());
		KeyGenerator keyGenerator = KeyGenerator.getInstance("DESede","BC");
		keyGenerator.init(new SecureRandom());  // 秘钥的长度  new SecureRandom() 默认长度
		SecretKey secretKey = keyGenerator.generateKey();
		return secretKey.getEncoded();
	}
	
	/**
	 * 使用 3des 对数据进行加密 
	 * @param src
	 * @param encryptKey
	 * @return
	 * @throws Exception
	 */
	public static byte [] BC_3DES_Encrypt(String src,byte [] encryptKey) throws Exception{
		//Key 的转换
		DESedeKeySpec keySpec = new DESedeKeySpec(encryptKey);
		SecretKeyFactory factory = SecretKeyFactory.getInstance("DESede");
		Key secretKey = factory.generateSecret(keySpec);
		
		//加密
		Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");
		cipher.init(Cipher.ENCRYPT_MODE, secretKey);
		byte [] result = cipher.doFinal(src.getBytes());
		return result;
	}
	
	/**
	 * 使用 3des 对数据进行解密 
	 * @param encryptBytes
	 * @param encryptKey
	 * @return
	 * @throws Exception
	 */
	public static String BC_3DES_Decrypt(byte [] encryptBytes ,byte [] encryptKey) throws Exception{
		//Key 的转换
		DESedeKeySpec keySpec = new DESedeKeySpec(encryptKey);
		SecretKeyFactory factory = SecretKeyFactory.getInstance("DESede");
		Key secretKey = factory.generateSecret(keySpec);
		
		//解密
		Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");
		cipher.init(Cipher.DECRYPT_MODE, secretKey);
		String result = new String(cipher.doFinal(encryptBytes));
		return result;
	}