PRB: X509Certificate Supports Only DER-Encoded Certificates (318217)

RESOLUTION

1. Remove the following strings from the certificate data:

   -----BEGIN CERTIFICATE-----
   -----END CERTIFICATE-----
   						

2. Decode the Base64 certificate data. For example, the following Visual C# sample code decodes Base64 certificate data:

   using System;
   using System.IO;
   using System.Security.Cryptography.X509Certificates;
   using System.Text;
   
   namespace ReadBase64Cert
   {
       public class ReadBase64Cert
       {
           public ReadBase64Cert()
           {
           }
           public static void Main(string[] args)
           {
               if (args.Length < 1)
               {
                   Console.WriteLine("Usage: Base64EncodedFile (.cer)\n");
                   return;
               }
   
               // args[0] - Base64Encoded .cer file
   
               // Open the certificate, and read it into a byte array.
               FileStream certFile = new FileStream(args[0],
                   FileMode.Open,
                   FileAccess.Read);
               int size = (int)certFile.Length;
               byte[] certBytes = new byte[size];
               size = certFile.Read(certBytes, 0, size);
               certFile.Close();
       
               // Remove the unnecessary characters.
               String certString = Encoding.ASCII.GetString(certBytes);
               StringBuilder sb = new StringBuilder(certString);
               sb.Replace("-----BEGIN CERTIFICATE-----", "");
               sb.Replace("-----END CERTIFICATE-----", "");
       
               // Decode the bytes from base64 to raw bytes.
               certBytes = Convert.FromBase64String(sb.ToString());
               X509Certificate cert = new X509Certificate(certBytes);
               Console.WriteLine(cert.GetName()); 
           }
       }
   }