Set the Decryption Certificate and Private Key

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Demonstrates the Chilkat Email.SetDecryptCert2 method, which explicitly provides a certificate and its corresponding private key as separate objects for decrypting a received encrypted email. Set them before loading the encrypted message. This example loads a .cer certificate and a PEM private key, sets both, then loads an encrypted email.

Background: Sometimes the certificate and its private key are stored separately — a public .cer file plus a PEM (or other format) key file — rather than combined in a PFX. SetDecryptCert2 accepts the two objects individually, which is the natural fit for that arrangement. It is the two-object counterpart to SetDecryptCert, which takes a single certificate that already carries its private key.

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bool success = false;

//  Demonstrates the SetDecryptCert2 method, which explicitly provides a certificate and its
//  corresponding private key (as separate objects) for decrypting a received encrypted
//  email.  Set them before loading the encrypted email.

Chilkat.Email email = new Chilkat.Email();

//  Load the certificate (public) and the matching private key from separate files.
Chilkat.Cert cert = new Chilkat.Cert();
success = cert.LoadFromFile("qa_data/certs/recipient.cer");
if (success == false) {
    Debug.WriteLine(cert.LastErrorText);
    return;
}

Chilkat.PrivateKey privKey = new Chilkat.PrivateKey();
success = privKey.LoadPemFile("qa_data/certs/recipient_privkey.pem");
if (success == false) {
    Debug.WriteLine(privKey.LastErrorText);
    return;
}

//  Provide the certificate and private key to use for decryption.
success = email.SetDecryptCert2(cert,privKey);
if (success == false) {
    Debug.WriteLine(email.LastErrorText);
    return;
}

//  Load the encrypted email; Chilkat decrypts it using the certificate and key.
success = email.LoadEml("qa_data/eml/encrypted.eml");
if (success == false) {
    Debug.WriteLine(email.LastErrorText);
    return;
}

Debug.WriteLine("Decrypted = " + Convert.ToString(email.Decrypted));

//  Note: Paths such as "qa_data/..." are relative local filesystem paths,
//  relative to the current working directory of the running application.