package com.hx.util;

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

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

/**
 * AES加解密工具
 * 使用该类，需要行替换local_policy.jar及us_export_policy.jar
 * @author ChenJiaHe
 *
 */
public class AesUtil {

	/**16位加密秘钥*/
	public static final String SECRET = "huoXiong16816888";
	
	/**
	 * AES加密
	 * 
	 * @param str
	 *            需要加密的明文
	 * @param secret
	 *            秘钥
	 * @return 加密后的密文(base64编码字符串)
	 */
	public static String aesEncryp(String str, String secret) {
		if (null != str) {
			byte[] bytes = null;

			try {
				Base64 base64 = new Base64();
				String ALGORITHM = "AES";
				SecretKey deskey = new SecretKeySpec(secret.getBytes("UTF-8"), ALGORITHM);// 生成密钥
				Cipher c;
				c = Cipher.getInstance(ALGORITHM);
				c.init(Cipher.ENCRYPT_MODE, deskey);
				bytes = c.doFinal(str.getBytes("UTF-8"));
				if (bytes != null) {
					return new String(base64.encode(bytes));
				}
			} catch (Exception e) {
				e.printStackTrace();
			}

		}
		return null;
	}
	
	/**
	 * AES解密
	 * 
	 * @param str
	 *            需要解密的秘文
	 * @param secret
	 *            秘钥
	 * @return 解密后的明文
	 */
	public static String aesDecryp(String str, String secret) {
		try {
			Base64 base64 = new Base64();
			String ALGORITHM = "AES";
			SecretKey deskey = new SecretKeySpec(secret.getBytes("UTF-8"), ALGORITHM);// 生成密钥
			Cipher c = Cipher.getInstance(ALGORITHM);
			c.init(Cipher.DECRYPT_MODE, deskey);
			return new String(c.doFinal(base64.decode(str.getBytes("UTF-8"))), "UTF-8");
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}

	/**
	 * AES加密（固定秘钥）
	 *
	 * @param str 需要加密的明文
	 * @return 加密后的密文(base64编码字符串)
	 */
	public static String aesEncryp(String str) {
		String secret = SECRET;
		if (null != str) {
			byte[] bytes = null;

			try {
				Base64 base64 = new Base64();
				String ALGORITHM = "AES";
				SecretKey deskey = new SecretKeySpec(secret.getBytes("UTF-8"), ALGORITHM);// 生成密钥
				Cipher c;
				c = Cipher.getInstance(ALGORITHM);
				c.init(Cipher.ENCRYPT_MODE, deskey);
				bytes = c.doFinal(str.getBytes("UTF-8"));
				if (bytes != null) {
					return new String(base64.encode(bytes));
				}
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
		return null;
	}

	/**
	 * AES解密（固定秘钥）
	 *
	 * @param str 需要解密的秘文
	 * @return 解密后的明文
	 */
	public static String aesDecryp(String str) {
		String secret = SECRET;
		try {
			Base64 base64 = new Base64();
			String ALGORITHM = "AES";
			SecretKey deskey = new SecretKeySpec(secret.getBytes("UTF-8"), ALGORITHM);// 生成密钥
			Cipher c = Cipher.getInstance(ALGORITHM);
			c.init(Cipher.DECRYPT_MODE, deskey);
			return new String(c.doFinal(base64.decode(str.getBytes("UTF-8"))), "UTF-8");
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}

}