/**
 * AES 128bit 加密解密工具类
 */
package com.nationalelectirc.utils;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Base64;

public class AesEncryptUtil {

	// 使用AES-128-CBC加密模式，key需要为16位,key和iv可以相同！
	public static final String KY = "sfrz20180607java";

	public static final String IV = "sfrz20180607java";

	/**
	 * 加密方法
	 * 
	 * @param data
	 *            要加密的数据
	 * @param key
	 *            加密key
	 * @param iv
	 *            加密iv
	 * @return 加密的结果
	 * @throws Exception
	 */
	public static String encrypt(String data, String key, String iv) throws Exception {
		try {

			Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");// "�㷨/ģʽ/���뷽ʽ"
			int blockSize = cipher.getBlockSize();

			byte[] dataBytes = data.getBytes();
			int plaintextLength = dataBytes.length;
			if (plaintextLength % blockSize != 0) {
				plaintextLength = plaintextLength + (blockSize - (plaintextLength % blockSize));
			}

			byte[] plaintext = new byte[plaintextLength];
			System.arraycopy(dataBytes, 0, plaintext, 0, dataBytes.length);

			SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES");
			IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes());

			cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);
			byte[] encrypted = cipher.doFinal(plaintext);
			Base64 base64 = new Base64();
			encrypted = base64.encode(encrypted);
			return new String(encrypted,"UTF-8");

		} catch (Exception e) {
			
			return null;
		}
	}

	/**
	 * 解密方法
	 * 
	 * @param data
	 *            要解密的数据
	 * @param key
	 *            解密key
	 * @param iv
	 *            解密iv
	 * @return 解密的结果
	 * @throws Exception
	 */
	public static String desEncrypt(String data, String key, String iv) throws Exception {
		try {
			byte[] b = data.getBytes();
			Base64 base64 = new Base64();
			byte[] encrypted1 = base64.decode(b);
			Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
			SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES");
			IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes());

			cipher.init(Cipher.DECRYPT_MODE, keyspec, ivspec);

			byte[] original = cipher.doFinal(encrypted1);
			String originalString = new String(original, "UTF-8");
			return originalString;
		} catch (Exception e) {
			
			return null;
		}
	}

	/**
	 * 使用默认的key和iv加密
	 * 
	 * @param data
	 * @return
	 * @throws Exception
	 */
	public static String encrypt(String data) throws Exception {
		return encrypt(data, KY, IV);
	}

	/**
	 * 使用默认的key和iv解密
	 * 
	 * @param data
	 * @return
	 * @throws Exception
	 */
	public static String desEncrypt(String data) throws Exception {
		return desEncrypt(data, KY, IV);
	}

	/**
	 * 测试
	 */
//	public static void main(String args[]) throws Exception {
//
//		String test = "18729990110";
//
//		String data = null;
//		String key = "dufy20170329java";
//		String iv = "dufy20170329java";
//
//		data = encrypt(test, key, iv);
//
//		System.out.println(data);
//		data = "e1pRPoA5eQSO6mY1spa3KW8ELlXoUuIdRzGzZR1yeSqj9unIe7r0O6LK/p1rZ/3yJ5DE5QpDbVrCAI+qavGA4Fuo+0ehB/n4WxYR1kbT4I6tfbgkI1oAC32XvOoX9cqSLuEOUpvwFe0tA2zO3FO4O/s6ergu7aaqMqq6c52y9GTm/3+RvFciJHXI0OlkVF92fg2OqKfEYPmHsKhnu5S4CtnHuqw5Ebbm7fI5H6jaIddf6S3e7is/v1bQ7EJ9MhkXyWq+MNsOl0HJBkjRoxBGm32D9/E52oObYj/8axhlWDdsA9erCps9Z0Jq3UvZ0B2Y8mfJ6glQC8TiNtBfdrIn5V9sRTN9/mC/81EZla96fw4dYcP27BFZ6C5T8gwT4K1pftSsyVsZsJ+B3KxDDvtwos5tEMub4RLZjC5WABHGT+ea3m0eDL9Jh7P+FUVD0TOLsP4/abxQJ0faMIzVyT08Tg==";
//		String data2 = "/3GcWickKhOKtV6v4ncCJii0Br4Lxb6r0GkRVm3MATZEgNh1CT2UC3hQbB+XNy6Lm19R0joUBwHE0uiebLdBgP/pyzlK6XlTfHseQCqg5yOaMLOjXrLL5yygH6+7GhDfrC9AanUgTZi7FVPoQu6jQT8YoP/+UObFi1fAtx/Dl7AxZW7OMAoLnQDWSGP9z2vRsIL8s/JQyO+B9+ePeHqtDhdRru0wb/ThdjUOQp1I1X0qOH7vTW7xmEjc8D0xck9gdgdtrlePu02Gcp2gmmS0ufuaJhDwEV/IW/djO2N+Ps+yNG7Tda4mRiTut7TphiyyfkUNduImqg1Qxn4uhUYcPTt4yxWYN2kjT8lOMKzDnvsRlopDrCBz22SlFkOFZ+W2cfxCpR0NQaBJAvzlWRrAJZ/V/OHuvZO9Hgo0224QyCnd/dKvwaA6Vzw2wdbOZ8KLk0BMIyBNESrpMQhu4XR9WQ==";
//		System.out.println(desEncrypt(data, key, iv));
//		System.out.println(desEncrypt(data2, key, iv));
//	}

}