C＃读回加密的密码 [英] C# Reading back encrypted passwords

问题描述

我使用下面的代码将密码保存到注册表中，我如何将其转换回来？下面的代码不是我的，但它加密好。

谢谢

 使用System.Security.Cryptography; 
 
 public static string EncodePasswordToBase64（string password）
 {byte [] bytes = Encoding.Unicode.GetBytes（password）; 
 byte [] dst = new byte [bytes.Length]; 
 byte [] inArray = HashAlgorithm.Create（SHA1）。ComputeHash（dst）; 
 return Convert.ToBase64String（inArray）; 
 
  

解决方案

SHA1是哈希算法，而不是加密算法。哈希算法是一种单向函数，它将数据转换为该数据的哈希值，但原始数据无法从哈希中获取。加密算法是一种双向函数，可将数据转换为加密数据，然后可将加密数据转换回原始数据。

I'm using the code below to save a password to the registry, how do I convert it back? The code below isn't mine but it encrypts well.

Thanks

using System.Security.Cryptography;

public static string EncodePasswordToBase64(string password)
{  byte[] bytes   = Encoding.Unicode.GetBytes(password);
   byte[] dst     = new byte[bytes.Length];
   byte[] inArray = HashAlgorithm.Create("SHA1").ComputeHash(dst);
   return Convert.ToBase64String(inArray);
}

解决方案

SHA1 is a hash algorithm, not an encryption algorithm. A hash algorithm is a one-way function which transforms data into a hash of that data, but the original data cannot be gotten back from the hash. An encryption algorithm is a two-way function which transforms data into encrypted data, and the encrypted data can then be transformed back into the original data.

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