在.NET Core中使用SHA-1

问题描述

在dotnet核心
中对字符串进行哈希处理时，我得到了奇怪的结果，我发现了类似的问题：

我已经安装了nuget软件包 System.Security.Cryptography.Algorithms （v 4.3.0）

也尝试使用 GetEncoding（0）获取sys默认编码。也不起作用。

解决方案

我不确定'SHA-1 Online'如何代表您的哈希，但是因为它是一个哈希，它可以包含无法在（UTF8）字符串中表示的字符。我认为您最好使用 Convert.ToBase64String（）轻松表示字符串中的字节数组哈希：

  var hashString = Convert.ToBase64String（hash）; 
  

要将其转换回字节数组，请使用 Convert.FromBase64String（ ）：

  var bytes = Convert.FromBase64String（hashString）; 
  

另请参阅：。其中显示了表示字符串中哈希的多种方法。例如， hash.ToString（ X）将使用十六进制表示形式。

针对<$ c顺便说一下，$ c> broodjepoep 。 ：-）

I get strange results when hashing a string in dotnet coreI have found this similar question: Computing SHA1 with ASP.NET Coreand have found how to convert a byte array to string in .net core

this is my code:

private static string CalculateSha1(string text)
{
    var enc = Encoding.GetEncoding(65001); // utf-8 code page
    byte[] buffer = enc.GetBytes(text);

    var sha1 = System.Security.Cryptography.SHA1.Create();

    var hash = sha1.ComputeHash(buffer);

    return enc.GetString(hash);
}

and this is my test:

string test = "broodjepoep"; // forgive me

string shouldBe = "b2bc870e4ddf0e15486effd19026def2c8a54753"; // according to http://www.sha1-online.com/

string wouldBe = CalculateSha1(test);

System.Diagnostics.Debug.Assert(shouldBe.Equals(wouldBe));

output:

I have the nuget package System.Security.Cryptography.Algorithms installed (v 4.3.0)

Also tried with GetEncoding(0) to get the sys default coding. Also did not work.

解决方案

I'm not sure how 'SHA-1 Online' represents your hash, buts since it's a hash, it can contain characters that can't be represented in a (UTF8) string. I think you're better off using Convert.ToBase64String() to easily represent the byte-array hash in a string:

var hashString = Convert.ToBase64String(hash);

To convert it back to a byte-array, use Convert.FromBase64String():

var bytes =  Convert.FromBase64String(hashString);

Also see: Converting a md5 hash byte array to a string. Which shows there a multiple ways to represent hash in a string. For example, hash.ToString("X") will use a hexadecimal representation.

Kudos for broodjepoep, by the way. :-)

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