package cn.efunbox.base.util;

import lombok.extern.slf4j.Slf4j;
import org.apache.commons.codec.digest.DigestUtils;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SignatureException;

@Slf4j
public class MD5 {
	public MD5() {
	}

	public static final String byte2hexString(byte[] bytes) {
		StringBuffer buf = new StringBuffer(bytes.length * 2);
		for (int i = 0; i < bytes.length; i++) {
			if (((int) bytes[i] & 0xff) < 0x10) {
				buf.append("0");
			}
			buf.append(Long.toString((int) bytes[i] & 0xff, 16));
		}
		return buf.toString();
	}

	/**
	 * md5加密
	 * @param sourceString
	 * @return
	 */
	public static String MD5Encode(String sourceString) {
		String resultString = null;
		try {
			resultString = new String(sourceString);
			MessageDigest md = MessageDigest.getInstance("MD5");
			resultString = byte2hexString(md.digest(resultString.getBytes()));
		} catch (Exception ex) {
		}
		return resultString;
	}
	
	 public static String getMD5Str(String str) {
	        MessageDigest messageDigest = null;

	        try {
	            messageDigest = MessageDigest.getInstance("MD5");

	            messageDigest.reset();

	            messageDigest.update(str.getBytes("UTF-8"));
	        } catch (NoSuchAlgorithmException e) {
	            System.out.println("NoSuchAlgorithmException caught!");
	            System.exit(-1);
	        } catch (UnsupportedEncodingException e) {
	            e.printStackTrace();
	        }

	        byte[] byteArray = messageDigest.digest();

	        StringBuffer md5StrBuff = new StringBuffer();

	        for (int i = 0; i < byteArray.length; i++) {
	            if (Integer.toHexString(0xFF & byteArray[i]).length() == 1)  {
	                md5StrBuff.append("0").append(Integer.toHexString(0xFF & byteArray[i]));
	            } else {
					md5StrBuff.append(Integer.toHexString(0xFF & byteArray[i]));
				}
	        }  
	  
	        return md5StrBuff.toString();  
	    }


	/**
	 * 签名字符串
	 * @param text 需要签名的字符串
	 * @param sign 签名结果
	 * @param key 密钥
	 * @return 签名结果
	 */
	public static boolean verify(String text, String sign, String key) {
		text = text + key;
		String mysign = DigestUtils.md5Hex(getContentBytes(text, "utf-8"));
		log.info("text : " + text);
		log.info("sign : " + mysign);
		if(mysign.equals(sign)) {
			return true;
		}
		else {
			return false;
		}
	}

	/**
	 * @param content
	 * @param charset
	 * @return
	 * @throws SignatureException
	 * @throws UnsupportedEncodingException
	 */
	private static byte[] getContentBytes(String content, String charset) {
		if (charset == null || "".equals(charset)) {
			return content.getBytes();
		}
		try {
			return content.getBytes(charset);
		} catch (UnsupportedEncodingException e) {
			throw new RuntimeException("MD5签名过程中出现错误,指定的编码集不对,您目前指定的编码集是:" + charset);
		}
	}


	public static void main(String[] args) throws UnsupportedEncodingException {

		String md5Str = getMD5Str("ylXny2u:tUagqa8e,#1596164432");
		System.out.println(md5Str);

	}

}