如何在 PHP 中解密 md5 字符串
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How to decrypt an md5 string in PHP
提问by deepak
I have encoded a string with md5()and I want to decrypt the same string.
我已经编码了一个字符串，md5()我想解密同一个字符串。
I have written the following code:
我编写了以下代码：
<?php
$rr = md5(utf8_encode('hello'));
echo $rr;
$rr1 = md5(utf8_decode('5d41402abc4b2a76b9719d911017c592'));
echo '<br/>' .$rr1;
?>
Now I am able to encrypt the string. But now, I want to decrypt the string. I have tried:
现在我可以加密字符串了。但是现在，我想解密字符串。我试过了：
md5(utf_decode('string'));
But it is not working. How can I decrypt the string which is encrypted with md5()?
但它不起作用。如何解密用 加密的字符串md5()？
回答by Will
You can't! MD5 is a one-way hash, not encryption. The whole point is that it's supposed to be impossible to reverse. What you'd use it for is, for example, storing a password. You don't need to know what the password is; you just need to md5()whatever the user typed into the password field, and see if it matches the stored md5()value of the user's password.
你不能！MD5 是一种单向散列，而不是加密。重点是它应该是不可能逆转的。例如，您将使用它来存储密码。你不需要知道密码是什么；您只需要md5()输入用户在密码字段中输入的任何内容，并查看它是否与md5()用户密码的存储值匹配。
If you want to be able to encrypt and decrypt, look into something like AES/ Twofish / Blowfish. The MCrypt modulewill help you quite a bit.
如果您希望能够加密和解密，请查看AES/ Twofish / Blowfish 之类的东西。在这个Mcrypt模块会帮你不少。
This questionprovides some additional resources for how to encrypt and decrypt in PHP.
这个问题提供了一些关于如何在 PHP 中加密和解密的额外资源。
I should also point out that md5()is a weak, collision-prone hashing algorithm, and shouldn't be trusted for high-security applications. I would use sha256 at minimum, or sha512.
我还应该指出，这md5()是一种弱的、容易发生冲突的散列算法，不应该被高安全性应用程序信任。我至少会使用 sha256 或 sha512。
