将哈希值更改回文本 [英] Changing hash back to text

问题描述

我已将密码设置为哈希并作为varchar存储到数据库中

但我想检索并将其转换回文本，因为它是

怎么做我这样做



继承人我怎么把它转换为哈希：



我试过的：

I have setup my password as hash and stored into the database as a varchar
But i want to retrieve and convert it back to text as it was
How do i do it

Heres how i converted it to hash:

What I have tried:

protected string MD5Hash(string input)
{
    StringBuilder stringBuilder = new StringBuilder();
    MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
    byte[] bytes = md5.ComputeHash(new UTF8Encoding().GetBytes(input));
    for (int i = 0; i < bytes.Length; i++)
    {
        stringBuilder.Append(bytes[i].ToString("x2"));
    }
    return stringBuilder.ToString();

}

推荐答案

根据定义，哈希不能转换回原始哈希值。



您可以做的是散列一个新字符串并比较两个哈希值。如果它们匹配，那么新字符串就是旧字符串之前的字符串。

A hash by definition cannot be converted back to the original.

What you can do is hash a new string and compare the two hashes. If they match then the new string is what the old one was before it was hashed.

Quote：

我已将密码设置为哈希并作为varchar存储到数据库中

但是我想检索并将其转换回文本原样

我该怎么办它

I have setup my password as hash and stored into the database as a varchar
But i want to retrieve and convert it back to text as it was
How do i do it

简答：你不能！

MD5哈希是一个单向进程，就像任何其他哈希一样。你不能逆转它，它是设计的。

与可以解密的加密相反。

Short answer: you can't !
MD5 hash is a one way process, like any other hash. you can't reverse it, it is by design.
Contrary to encryption which can be decrypted.

你无法从哈希中获取原始数据。那是设计上的。如果需要解密，则必须使用加密方法而不是哈希。

You can't get the original data from a hash. That is by design. If you need to decrypt, you have to use an encryption method instead of a hash.

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