X509Certificate Sınıfı

CreateFromCertFile metodu
Şöyle yaparız

string Certificate = "foobar.cer";
X509Certificate cert = X509Certificate.CreateFromCertFile(Certificate);

GetRawCertData metodu
Şöyle yaparız

Org.BouncyCastle.X509.X509CertificateParser cp = 
  new Org.BouncyCastle.X509.X509CertificateParser();

Org.BouncyCastle.X509.X509Certificate[] chain = 
  new Org.BouncyCastle.X509.X509Certificate[] {
    cp.ReadCertificate(cert.GetRawCertData())
 };

GetPublicKey metodu
Şöyle yaparız

byte[] results = cert.GetPublicKey();