package com.product.text.message.util;

import java.security.MessageDigest;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.codec.binary.Base64;

/**
 * MD5加密/验证工具类
* Copyright  PRODUCT-BASE
* @Title: PRODUCT-BASE-
* @Project: Md5Util
* @Date: 2021年6月25日 下午5:09:51
* @Author: 杜洪波
* @Description:
 */
public class Md5Util {
	static final char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };

	/**
	 * 生成MD5码
	 * 
	 * @param plainText 要加密的字符串
	 * @return md5值
	 */
	public final static String MD5(String plainText) {
		try {
			byte[] strTemp = plainText.getBytes("UTF-8");
			MessageDigest mdTemp = MessageDigest.getInstance("MD5");
			mdTemp.update(strTemp);
			byte[] md = mdTemp.digest();
			int j = md.length;
			char str[] = new char[j * 2];
			int k = 0;
			for (int i = 0; i < j; i++) {
				byte byte0 = md[i];
				str[k++] = hexDigits[byte0 >>> 4 & 0xf];
				str[k++] = hexDigits[byte0 & 0xf];
			}
			return new String(str);
		} catch (Exception e) {
			return null;
		}
	}

	/**
	 * 生成MD5码
	 * 
	 * @param plainText 要加密的字符串
	 * @return md5值
	 */
	public final static String MD5(byte[] plainText) {
		try {
			byte[] strTemp = plainText;
			MessageDigest mdTemp = MessageDigest.getInstance("MD5");
			mdTemp.update(strTemp);
			byte[] md = mdTemp.digest();
			int j = md.length;
			char str[] = new char[j * 2];
			int k = 0;
			for (int i = 0; i < j; i++) {
				byte byte0 = md[i];
				str[k++] = hexDigits[byte0 >>> 4 & 0xf];
				str[k++] = hexDigits[byte0 & 0xf];
			}
			return new String(str);
		} catch (Exception e) {
			return null;
		}
	}

	/**
	 * 先进行HmacSHA1转码再进行Base64编码
	 * 
	 * @param data 要SHA1的串
	 * @param key  秘钥
	 * @return
	 * @throws Exception
	 */
	public static String HmacSHA1ToBase64(String data, String key) throws Exception {
		SecretKeySpec signingKey = new SecretKeySpec(key.getBytes(), "HmacSHA1");
		Mac mac = Mac.getInstance("HmacSHA1");
		mac.init(signingKey);
		byte[] rawHmac = mac.doFinal(data.getBytes());
		return Base64.encodeBase64String(rawHmac);
	}

	/**
	 * 校验MD5码
	 * 
	 * @param text 要校验的字符串
	 * @param md5  md5值
	 * @return 校验结果
	 */
	public static boolean valid(String text, String md5) {
		return md5.equals(MD5(text)) || md5.equals(MD5(text).toUpperCase());
	}

	/**
	 * 
	 * @param params
	 * @return
	 */
	public static String MD5(String... params) {
		StringBuilder sb = new StringBuilder();
		for (String param : params) {
			sb.append(param);
		}
		return MD5(sb.toString());
	}
}