提取与X509证书XML文件中的公钥？ [英] Extract public key from an XML file with X509certificate?

问题描述

我想从XML文件创建在C＃中的 X509Certificate2 对象。 XML文件是我们从供应商那里获得了 SAML 元数据文件。

I am trying to create an X509Certificate2 object in C# from an XML file. The XML file is a SAML metadata file that we received from a vendor.

我试图提取公从这些XML元素键：

I am trying to extract the public key from these XML Elements:

<X509Data>
    <X509Certificate>
      MIIB7DCCAVmgAwIBAgIQPjHcBTL63bBLuJZ88RcrCjAJBgUrDgMCHQUAMBExDzANBgNVBAMT
      BnJvbWVvazAgFw0xMDAzMTUwMjI1MjZaGA8yMTEwMDIxOTAyMjUyNlowETEPMA0GA1UEAxMG
      cm9tZW9rMIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDAu/sBh13A27rR7gJpZsI6zCee
      TXNohQWlq2z6Zg8Oxzsy5JoVV 
    </X509Certificate>
</X509Data> 

有没有在C＃的方式来提取无论是从XML元素的.CER文件或公钥呢？

Is there a way in C# to extract either the .cer file or public key from the XML element?

推荐答案

这是一个很难回答的问题不知道X509证书是如何编码的回答，但假设你有编码的东西，你可以做类似如下：

This is a difficult question to answer without knowing how the X509Certificate is encoded, but assuming you have the encoding stuff, you can do something like the following:

  var document = new XmlDocument();
  document.LoadXml(txtXml.Text);
  var cert = document.SelectSingleNode("X509Data/X509Certificate").InnerText;
  /*...Decode text in cert here (may need to use Encoding, Base64, UrlEncode, etc) ending with 'data' being a byte array...*/ 
  var x509 = new X509Certificate2(data);

然后，你应该能够使用标准的文件I / O逻辑将文件写入到磁盘。

Then you should be able to write the file to disk using standard File I/O logic.

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