com.github.fosin.cdp.util.crypt.MD5Util Maven / Gradle / Ivy

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package com.github.fosin.cdp.util.crypt;

import lombok.extern.slf4j.Slf4j;

import java.security.MessageDigest;

@Slf4j
/**
 * MD5Util class.
 *
 * @author 28860823
 * @version $Id: $
 */
public class MD5Util {

    /**
     * encrypt
     *
     * @param s a {@link java.lang.String} object.
     * @return a {@link java.lang.String} object.
     */
    public final static String encrypt(String s) {
        char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
        try {
            byte[] btInput = s.getBytes();
            // 获得MD5摘要算法的 MessageDigest 对象
            MessageDigest mdInst = MessageDigest.getInstance("MD5");
            // 使用指定的字节更新摘要
            mdInst.update(btInput);
            // 获得密文
            byte[] md = mdInst.digest();
            // 把密文转换成十六进制的字符串形式
            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) {
            log.error("generate md5 error, {}", s, e);
            return null;
        }
    }
}