如何从X509Certificate2获取组织名称？

Question

I can get the full subject string from an X509Certificate2 via the Subject property, but is there any way to get a specific value from the subject string (eg just O = "Stack Exchange, Inc." )? The SubjectName property looked promising, but it seems to only contain more ways of dumping the entire subject into a string.

Answer 1

No you can't, the X509Certificate2 does not have any property besides Subject to get the information that you need.

But if you really need to have the Organization name separeted, you could have it with a simple regex match:

var organization = Regex.Match(certificate.Subject, @"O\s?=(.*)\s").Groups[1].ToString();

Answer 2

In the Portable.BouncyCastle library (available via NuGet ) there is an X509Name class that allows you to do something like this:

using Org.BouncyCastle.Asn1.X509;
using System.Linq;
using System.Security.Cryptography.X509Certificates;

...

X509Certificate2 certificate = ...

var name = new X509Name(certificate.Subject);
var organization = name
  .GetValueList(X509Name.O)
  .OfType<string>()
  .FirstOrDefault();