如何使用MD5散列密码 [英] how to hash an password using MD5

问题描述

大家好，我实现了这个代码来哈希用户密码，但是当我再次尝试哈希相同的密码时，它会生成另一个哈希！

这是我的代码：

Hi all, i implemented this code to hash user password, but when i try to hash the same password again, it generates another hash!
this is my code:

public static String ConvertToHash(String password)
	{
		try {
			MessageDigest ms = MessageDigest.getInstance("MD5");
			byte[] pass = password.getBytes();
			byte[] hashedpass = ms.digest(password.getBytes("UTF-8"));
			String hashed = hashedpass.toString();
			return hashed;
		} catch (NoSuchAlgorithmException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (UnsupportedEncodingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		return null;
		
	}

错误原因是什么？

提前感谢！

what is the error causes that?
thanks in advance!

推荐答案

这个有效：

This one works:

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

public class HelloWorld{
    public static String ConvertToHash(String password)
	{
		try {
			MessageDigest ms = MessageDigest.getInstance("MD5");
			byte[] pass = password.getBytes();
			byte[] byteData = ms.digest(password.getBytes("UTF-8"));
			StringBuffer sb = new StringBuffer();
            for (int i = 0; i < byteData.length; i++) {
             sb.append(Integer.toString((byteData[i] & 0xff) + 0x100, 16).substring(1));
            }
			return sb.toString();
		} catch (NoSuchAlgorithmException e) {
			return null;
		} catch (UnsupportedEncodingException e) {
			return null;
		}
	}
     
     public static void main(String []args){
        System.out.println(ConvertToHash("password"));
        System.out.println(ConvertToHash("password"));
     }
}

请参阅我对问题的评论：不要使用MD5！例如，您可以通过类 java.security.MessageDigest 使用SHA-256：

http://docs.oracle.com/javase/7/docs/api/java/security/MessageDigest.html [ ^ ] 。

-SA

Please see my comment to the question: don't use MD5! For example, you can use SHA-256 through the class java.security.MessageDigest:
http://docs.oracle.com/javase/7/docs/api/java/security/MessageDigest.html[^].

—SA

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