package com.ruoyi.web.util;

/**
 * @ClassName ParseMD5
 * @Description: TODO
 * @Author LX
 * @Date 2023/6/27
 * @Version V1.0
 **/

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * 将字符串转换为MD5
 */
public class ParseMD5 {

    private final static String mStrClassName = "ParseMD5";
    private final static String EMPTY_NULL = "NULL";

    private static final Logger sys_error_logger = LoggerFactory.getLogger("sys-error");

    public static String parseStrToMd5L32(String str) {
        // 将字符串转换为32位小写MD5
        String reStr = null;
        try {
            MessageDigest md5 = MessageDigest.getInstance("MD5");
            byte[] bytes = md5.digest(str.getBytes());
            StringBuffer stringBuffer = new StringBuffer();
            for (byte b : bytes) {
                int bt = b&0xff;
                if (bt < 16) {
                    stringBuffer.append(0);
                }
                stringBuffer.append(Integer.toHexString(bt));
            }
            reStr = stringBuffer.toString();
        } catch (NoSuchAlgorithmException e) {
            sys_error_logger.error(String.format(mStrClassName+" errorMsg: %s====>"
                    ,e.getLocalizedMessage()));
        }
        return reStr;
    }

    // 将字符串转换为32位大写的MD5
    public static String parseStrToMd5U32(String str) {
        String reStr = parseStrToMd5L32(str);
        if (reStr != null) {
            reStr = reStr.toUpperCase();
        }
        return reStr;
    }

    // 将字符串转换为16位小写的MD5
    public static String parseStrToMd5L16(String str) {
        String reStr = parseStrToMd5L32(str);
        if (reStr != null) {
            reStr = reStr.substring(8, 24);
        }
        return reStr;
    }

    // 将字符串转换为16位大写的MD5
    public static String parseStrToMd5U16(String str) {
        String reStr = parseStrToMd5L32(str);
        if (reStr != null) {
            reStr = reStr.toUpperCase().substring(8, 24);
        }
        return reStr;
    }
}