Get x059 certificate extensions in C#

This is how you could get following X509Extension details in C#

Subject alternative name
CRL distribution points,
Authority information access,
certificate policies,
Thumbprint algorithm

[1]Certificate Policy:
Policy Identifier=2.16.356.100.2.2

Key Usage

Digital Signature, Non-Repudiation (c0)

[1]Authority Info Access

Access Method=Certification Authority Issuer (1.3.6.7.8.5.7.48.2)

Alternative Name:

URL=https://www.CA.com/CA2014.cer

[2]Authority Info Access

Access Method=On-line Certificate Status Protocol (1.5.7.1..1)

Alternative Name:

URL=http://ocsp.ca.com

RFC822 Name=ramesh@parijatha.com

Simple C# example given below:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Security;
using System.Security.Cryptography;
using System.Security.Cryptography.X509Certificates;


namespace x059_certificate_extensions_in_Csharp
{
    class Program
    {
        static void Main(string[] args)
        {
            string folder = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location);
            X509Certificate2 cert = new X509Certificate2( folder + "\\dgft.cer");

            foreach (X509Extension ext in cert.Extensions)
            {
                //get all extension information of certificate like, 
                AsnEncodedData asndata = new AsnEncodedData(ext.Oid, ext.RawData);
                Console.WriteLine(asndata.Format(true));
            }
            
            Console.ReadLine();
        }
    }
}

Thursday, 19 May 2016

Get x059 certificate extensions in C#

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