将Base64编码的md5转换为可读的String

问题描述

我有一个密码存储在ldap中作为md5哈希： {MD5} 3CydFlqyl / 4AB5cY5ZmdEA ==
从它的外观来看，它是base64编码的。
如何将从ldap接收的字节数组转换为可读的md5-hash-style字符串，如下所示： 1bc29b36f623ba82aaf6724fd3b16718 ？
是 {MD5} 哈希或ldap的一部分是否添加它并且应该在解码之前将其删除？

  String b = Base64.decodeBase64的（a）的ToString（）; 
  

它返回 - [B @ 24bf1f20 。可能这是一个错误的编码，但当我将其转换为UTF-8时，我看到不可读的字符。
那么，我该怎么做才能解决这个问题？

解决方案

看来上面的答案是针对C＃的，因为那里对于Java中的StringBuilder类，没有这样的AppendFormat方法。

这是正确的解决方案：

  public static String getMd5Hash（String str）throws NoSuchAlgorithmException，UnsupportedEncodingException 
 {
 MessageDigest md = MessageDigest.getInstance（MD5）; 
 byte [] thedigest = md.digest（str.getBytes（UTF-8））; 
 
 StringBuilder hexString = new StringBuilder（）; 
 
 for（int i = 0; i< thedigest.length; i ++）
 {
 String hex = Integer.toHexString（0xFF& thedigest [i]）; 
 if（hex.length（）== 1）
 hexString.append（'0'）; 
 
 hexString.append（hex）; 
} 
 
返回hexString.toString（）。toUpperCase（）; 
} 
  

I have a password stored in ldap as md5 hash: {MD5}3CydFlqyl/4AB5cY5ZmdEA==By the looks of it, it's base64 encoded.How can i convert byte array received from ldap to a nice readable md5-hash-style string like this: 1bc29b36f623ba82aaf6724fd3b16718 ?Is {MD5} a part of hash or ldap adds it and it should be deleted before decoding?

I've tried to use commons base64 lib, but when i call it like this:

String b = Base64.decodeBase64(a).toString();

It returns this - [B@24bf1f20. Probably it's a wrong encoding, but when i convert it to UTF-8 i see unreadable chars.So, what can i do to solve this?

解决方案

It appears the above answer was for C#, as there is no such AppendFormat method for the StringBuilder class in Java.

Here is the correct solution:

public static String getMd5Hash(String str) throws NoSuchAlgorithmException, UnsupportedEncodingException
{
  MessageDigest md = MessageDigest.getInstance("MD5");
  byte[] thedigest = md.digest(str.getBytes("UTF-8"));

  StringBuilder hexString = new StringBuilder();

  for (int i = 0; i < thedigest.length; i++)
  {
      String hex = Integer.toHexString(0xFF & thedigest[i]);
      if (hex.length() == 1)
          hexString.append('0');

      hexString.append(hex);
  }

  return hexString.toString().toUpperCase();
}

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