Export Private Key to PKCS8, PEM, DER, XML

Demonstrates how to export a digital certificate's private key to RSA PEM or DER, PKCS8 PEM or DER, or XML.

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Chilkat.Cert cert = new Chilkat.Cert();

//  Th LoadByCommonName method searches the Windows
//  Current User Certificate Store and Local Machine Certificate
//  Store for a certificate whose common name (CN) matches
//  the argument:
bool success;
success = cert.LoadByCommonName("Chilkat Software, Inc.");
if (success == false) {
    MessageBox.Show("Failed to find certificate!");
}
else {

    //  Get the PrivateKey object:
    Chilkat.PrivateKey pkey;

    pkey = cert.ExportPrivateKey();
    if (!(pkey == null )) {

        //  Export the private key to an RSA DER file:
        pkey.SaveRsaDerFile("pkey_rsa.der");

        //  Export to a PKCS8 DER file:
        pkey.SavePkcs8File("pkey_pkcs8.der");

        //  Export to an RSA PEM file:
        pkey.SaveRsaPemFile("pkey_rsa.pem");

        //  Export to a PKCS8 PEM file:
        pkey.SavePkcs8PemFile("pkey_pkcs8.pem");

        //  Export to XML:
        pkey.SaveXmlFile("pkey.xml");

        //  Get PKCS8 PEM string:
        textBox1.Text += "PKCS8 PEM Private Key:" + "\r\n";
        textBox1.Refresh();
        textBox1.Text += pkey.GetPkcs8Pem() + "\r\n";
        textBox1.Refresh();

        //  Get RSA PEM string:
        textBox1.Text += "RSA PEM Private Key:" + "\r\n";
        textBox1.Refresh();
        textBox1.Text += pkey.GetRsaPem() + "\r\n";
        textBox1.Refresh();

    }
    else {
        MessageBox.Show("No private key found!");
    }

}

//  The Chilkat Certificate, Certificate Store, Private Key,
//  Public Key, and Key Container classes / objects are freeware.

//  They are used by and included with the Chilkat Email,
//  Crypt, S/MIME, and other commercial Chilkat components.