如何解密SHA256？ [英] How can decrypte SHA256 ?

问题描述

 
我使用以下流程来加密某些文本。我怎样才能解密结果。 
 
  public   static   string  GetSHA256（ string  text）
 {
 UnicodeEncoding ue =  new  UnicodeEncoding （）; 
  byte  [] hashValue; 
  //   byte [] message = ue.GetBytes（NYRR+ text +RRYN）;  
  byte  [] message = ue.GetBytes（text.Length *  2  + text + text.Length *  2 ）; 
 
 SHA256Managed hashString =  new  SHA256Managed（）; 
  string  hex =  ; 
 
 hashValue = hashString.ComputeHash（message）; 
  foreach （ byte  x  in  hashValue）
 {
 hex + =  String  .Format（  {0：x2}，x）; 
} 
  return  hex; 
} 

我的尝试：

  public   static   string  GetSHA256（ string  text）
 {
 UnicodeEncoding ue =  new  UnicodeEncoding（）; 
  byte  [] hashValue; 
  //   byte [] message = ue.GetBytes（NYRR+ text +RRYN）;  
  byte  [] message = ue.GetBytes（text.Length *  2  + text + text.Length *  2 ）; 
 
 SHA256Managed hashString =  new  SHA256Managed（）; 
  string  hex =  ; 
 
 hashValue = hashString.ComputeHash（message）; 
  foreach （ byte  x  in  hashValue）
 {
 hex + =  String  .Format（  {0：x2}，x）; 
} 
  return  hex; 
} 

解决方案

像 SHA 等哈希函数是由定义单向意味着散列过程会丢失结果中的信息，并且不能用于加密。

< blockquote class =quote>

Quote：

如何解密SHA256

你不能因为SHA256不加密。

就像用数字命理学。在数字命理学中，你给出一个名称的值，通过对每个字母给出的值求和，你不能反转过程。

SHA256是一种散列方法，而不是加密方法。您无法解密哈希值，因为它是基于被哈希的字符串值的数学确定值。

Hi ,

I am using follwoing process to Encrypt the certain text .How can i decrypt the result.

public static string GetSHA256(string text)
  {
      UnicodeEncoding ue = new UnicodeEncoding();
      byte[] hashValue;
      //byte[] message = ue.GetBytes("NYRR" + text + "RRYN");
      byte[] message = ue.GetBytes(text.Length * 2 + text + text.Length * 2);

      SHA256Managed hashString = new SHA256Managed();
      string hex = "";

      hashValue = hashString.ComputeHash(message);
      foreach (byte x in hashValue)
      {
          hex += String.Format("{0:x2}", x);
      }
      return hex;
  }

What I have tried:

public static string GetSHA256(string text)
  {
      UnicodeEncoding ue = new UnicodeEncoding();
      byte[] hashValue;
      //byte[] message = ue.GetBytes("NYRR" + text + "RRYN");
      byte[] message = ue.GetBytes(text.Length * 2 + text + text.Length * 2);

      SHA256Managed hashString = new SHA256Managed();
      string hex = "";

      hashValue = hashString.ComputeHash(message);
      foreach (byte x in hashValue)
      {
          hex += String.Format("{0:x2}", x);
      }
      return hex;
  }

解决方案

Hash functions like SHA etc. are by definition one-way meaning that the process of hashing will loose information in the result, and cannot be used for encryption.

Quote:

How can decrypte SHA256

You can't because SHA256 is not encryption.
It is like with numerology. In numerology you give give a value to a name by summing the values given to each letters, you can't reverse the process.

SHA256 is a hashing method, not an encryption method. You can't decrypt a hash value because it's a mathematically determined value based on the value of the string being hashed.

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