如何从 RSA public 密钥 XML 文件中获取 n 值.net core c#

Question

JWKS 端点的 n 值是多少。

如何从 .net core c# 中的 RSA public 密钥 XML 文件中获取 n 值。

这是我的 RSA public 密钥。

<RSAKeyValue><Modulus>w2EmXqTfj7LDHtN8/H6I1XAOW5bnH2j0IYDK2VSg0kd+TtCJDh/rogV/ouxGBYoyr6pEtuOQsQyIYcUWektRL+/hVHPZzw9VTNtxGpgYZoVjFH1TB+acJ5wz7eOAybLdEHA4/F7A9VyvlRDir6AuuXcqF4yU0G3Ew21bFzRT7S0hDMMmHCsKwvi33lFkWkMFNnXVwQMdWu59jgksMvTQDWpFveUBr1E4R9FRYmrQPe4hMrjijlmS86xBTn3Qasd6qnT2uW137uwtC2aaqWS/Q8BGBbDpOxiMxffrGLyr3Xos1dOCgqx+oE/ZW6+CGhC+F4My/2EZNciyGhtt4N5abQ==</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>

Answer 1

模数为 n，指数为 e，另请参阅 here

几行，使用LINQ to XML，你可以提取值：

using System;
using System.Xml.Linq;

namespace RSAXML
{
    class Program
    {
        static void Main(string[] args)
        {

            string RSAKey = "<RSAKeyValue><Modulus>w2EmXqTfj7LDHtN8/H6I1XAOW5bnH2j0IYDK2VSg0kd+TtCJDh/rogV/ouxGBYoyr6pEtuOQsQyIYcUWektRL+/hVHPZzw9VTNtxGpgYZoVjFH1TB+acJ5wz7eOAybLdEHA4/F7A9VyvlRDir6AuuXcqF4yU0G3Ew21bFzRT7S0hDMMmHCsKwvi33lFkWkMFNnXVwQMdWu59jgksMvTQDWpFveUBr1E4R9FRYmrQPe4hMrjijlmS86xBTn3Qasd6qnT2uW137uwtC2aaqWS/Q8BGBbDpOxiMxffrGLyr3Xos1dOCgqx+oE/ZW6+CGhC+F4My/2EZNciyGhtt4N5abQ==</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>";

            XElement RSAKeyXML = XElement.Parse(RSAKey);
            
            string Modulus = RSAKeyXML.Element("Modulus").Value.ToString();

            Console.WriteLine(Modulus);
        }
    }
}

结果：

w2EmXqTfj7LDHtN8/H6I1XAOW5bnH2j0IYDK2VSg0kd+TtCJDh/rogV/ouxGBYoyr6pEtuOQsQyIYcUWektRL+/hVHPZzw9VTNtxGpgYZoVjFH1TB+acJ5wz7eOAybLdEHA4/F7A9VyvlRDir6AuuXcqF4yU0G3Ew21bFzRT7S0hDMMmHCsKwvi33lFkWkMFNnXVwQMdWu59jgksMvTQDWpFveUBr1E4R9FRYmrQPe4hMrjijlmS86xBTn3Qasd6qnT2uW137uwtC2aaqWS/Q8BGBbDpOxiMxffrGLyr3Xos1dOCgqx+oE/ZW6+CGhC+F4My/2EZNciyGhtt4N5abQ==

在此您可以看到如何根据模数和指数导入密钥。

如何从 RSA public 密钥 XML 文件中获取 n 值.net core c#

How to get n value from RSA public key XML file .net core c#

c#

jwt

rsa

public-key