Encrypt MIME for Multiple Recipients

See more MIME Examples

Demonstrates encrypting the current MIME entity for several recipients at once. A certificate is added for each recipient with AddEncryptCert, and EncryptN then produces a single CMS/PKCS #7 message that each recipient can independently decrypt.

The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

bool success = false;

Chilkat.Mime mime = new Chilkat.Mime();
success = mime.SetBodyFromPlainText("This message will be encrypted.");
if (success == false) {
    Debug.WriteLine(mime.LastErrorText);
    return;
}

//  Add a certificate for each intended recipient.  Every recipient receives an independently
//  wrapped copy of the message key.
Chilkat.Cert cert1 = new Chilkat.Cert();
success = cert1.LoadFromFile("qa_data/recipient1.cer");
if (success == false) {
    Debug.WriteLine(cert1.LastErrorText);
    return;
}

success = mime.AddEncryptCert(cert1);
if (success == false) {
    Debug.WriteLine(mime.LastErrorText);
    return;
}

Chilkat.Cert cert2 = new Chilkat.Cert();
success = cert2.LoadFromFile("qa_data/recipient2.cer");
if (success == false) {
    Debug.WriteLine(cert2.LastErrorText);
    return;
}

success = mime.AddEncryptCert(cert2);
if (success == false) {
    Debug.WriteLine(mime.LastErrorText);
    return;
}

//  Encrypt for every added recipient at once.
success = mime.EncryptN();
if (success == false) {
    Debug.WriteLine(mime.LastErrorText);
    return;
}

success = mime.SaveMime("qa_output/encrypted_multi.eml");
if (success == false) {
    Debug.WriteLine(mime.LastErrorText);
    return;
}

Debug.WriteLine("Message encrypted for multiple recipients.");