Set the Decryption Certificate for an Email

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Demonstrates the Chilkat Email.SetDecryptCert method, which explicitly provides a certificate (with access to its private key) for decrypting a received encrypted email. Set the certificate before loading the encrypted message so Chilkat can decrypt it automatically. This example loads the certificate from a PFX, sets it, and then loads an encrypted email.

Background: Decrypting S/MIME email requires the recipient's private key. On Windows and macOS, Chilkat can find an installed certificate automatically, but when the key lives in a standalone PFX file you provide it explicitly with SetDecryptCert. A PFX (PKCS#12) bundles the certificate and its private key in one password-protected file. If the certificate and key are in separate files, use SetDecryptCert2 instead.

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bool success = false;

//  Demonstrates the SetDecryptCert method, which explicitly provides a certificate (with
//  access to its private key) for decrypting a received encrypted email.  Set the cert
//  before loading the encrypted email so it can be decrypted automatically.

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

//  Load a certificate together with its private key from a PFX file.
Chilkat.Cert cert = new Chilkat.Cert();
success = cert.LoadPfxFile("qa_data/certs/decryption.pfx","pfx_password");
if (success == false) {
    Debug.WriteLine(cert.LastErrorText);
    return;
}

//  Provide the certificate to use for decryption.
success = email.SetDecryptCert(cert);
if (success == false) {
    Debug.WriteLine(email.LastErrorText);
    return;
}

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

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