Decrypt MIME with PFX

Demonstrates how to decrypt MIME using a PFX (containing a digital certificate with private key). The content-type of an encrypted MIME message looks like this:

Content-Type: application/x-pkcs7-mime;
	name="smime.p7m"

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Chilkat.Mime mime = new Chilkat.Mime();

bool success;
success = mime.UnlockComponent("Anything for 30-day trial");
if (success == false) {
    MessageBox.Show("Failed to unlock component");
    return;
}

success = mime.LoadMimeFile("encryptedEmail.eml");
if (success != true) {
    textBox1.Text += mime.LastErrorText + "\r\n";
    return;
}

Chilkat.CertStore certStore = new Chilkat.CertStore();
success = certStore.LoadPfxFile("myPfx.pfx","myPfxPassword");
if (success != true) {
    textBox1.Text += certStore.LastErrorText + "\r\n";
    return;
}

//  Find the certificate by email address.  There are many
//  ways to find certificates within a Chilkat certificate store
//  object...
Chilkat.Cert cert = null;
cert = certStore.FindCertBySubjectE("support@chilkatsoft.com");
if (cert == null ) {
    textBox1.Text += certStore.LastErrorText + "\r\n";
    return;
}

Chilkat.PrivateKey privKey = null;
privKey = cert.ExportPrivateKey();
if (privKey == null ) {
    textBox1.Text += cert.LastErrorText + "\r\n";

    return;
}

success = mime.Decrypt2(cert,privKey);
if (success != true) {
    textBox1.Text += mime.LastErrorText + "\r\n";
    return;
}

//  Show the decrypted MIME:
textBox1.Text += mime.GetMime() + "\r\n";