package com.ule.demo;

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

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

/**
 * 邮乐报文 加解密工具类
 * 
 * @author admin
 *
 */
public class AESUtils {

	/**
	 * 数据加密
	 *
	 * @param requestData
	 * @param aesKey
	 * @return
	 */
	public static String encryData(String requestData, String aesKey) throws Exception {
		byte[] encryptedData = aesEncrypt(requestData, aesKey, aesKey);
		return Base64.encodeBase64String(encryptedData);
	}

	/**
	 * 数据解密
	 *
	 * @param requestData
	 * @param aesKey
	 * @return
	 */
	public static String decryptData(String encryptedData, String aesKey) throws Exception {
		return aesDecrypt(encryptedData, aesKey, aesKey);
	}

	/**
	 * aes加密
	 *
	 * @param decryptedData
	 * @param encryptKey
	 * @param ivKeys
	 * @return
	 * @throws Exception
	 */
	private static byte[] aesEncrypt(String decryptedData, String encryptKey, String ivKeys) throws Exception {
		String PKCS5Padding = "AES/CBC/PKCS5Padding";
		Cipher cipher = Cipher.getInstance(PKCS5Padding);
		byte[] raw = ivKeys.getBytes("utf-8");
		IvParameterSpec iv = new IvParameterSpec(raw);
		cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(encryptKey.getBytes("utf-8"), "AES"), iv);
		byte[] encryptedData = cipher.doFinal(decryptedData.getBytes("UTF-8"));
		return encryptedData;
	}

	/**
	 * aes解密
	 *
	 * @param encryptedData
	 * @param encryptKey
	 * @param ivKeys
	 * @return
	 * @throws Exception
	 */
	private static String aesDecrypt(String encryptedData, String encryptKey, String ivKeys) throws Exception {
		String PKCS5Padding = "AES/CBC/PKCS5Padding";
		Cipher cipher = Cipher.getInstance(PKCS5Padding);
		byte[] raw = ivKeys.getBytes("utf-8");
		IvParameterSpec iv = new IvParameterSpec(raw);
		cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(encryptKey.getBytes("utf-8"), "AES"), iv);
		byte[] decryptedData = cipher.doFinal(Base64.decodeBase64(encryptedData));
		return new String(decryptedData, "UTF-8");
	}

	/**
	 * MD5摘要算法
	 * 
	 * @throws @throws
	 */
	public static String MD5(String key) {
		return DigestUtils.md5Hex(key);
	}
}