(.NET Core C#) Send Encrypted Email using Certificate in Apple Keychain

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Send encrypted (S/MIME) email using a certificate found in the Apple Keychain.

Note: This example requires Chilkat v10.1.2 or later.

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Chilkat.Email email = new Chilkat.Email();
email.Subject = "This email is encrypted";
email.Body = "This is a S/MIME encrypted mail";
email.From = "Joe <joe@example.com>";

// Emails are encrypted using the recipient's certificate.
string recipientEmailAddr = "jane@example2.com";
email.AddTo("",recipientEmailAddr);

// Indicate that the email is to be sent encrypted.
email.SendEncrypted = true;

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

// -----------------------------------------------
// This example requires Chilkat v10.1.2 or later.
// -----------------------------------------------

// The recipient's certificate is used to encrypt.
// This will load the certificate from the Apple Keychain.
bool success = cert.LoadByEmailAddress(recipientEmailAddr);
if (success != true) {
    Debug.WriteLine(cert.LastErrorText);
    return;
}

// Specify the certificate to be used for encryption.
success = email.SetEncryptCert(cert);
email.SendEncrypted = true;

Chilkat.MailMan mailman = new Chilkat.MailMan();
mailman.SmtpHost = "smtp.example.com";
mailman.SmtpUsername = "joe@example.com";
mailman.SmtpPort = 587;
mailman.StartTLS = true;

// We'll get the SMTP password from the Apple Keychain.
// See how we originally saved the email credentials to the Keychain here:
// Save Email Credentials in Apple Keychain or Windows Credentials Manager
Chilkat.Secrets secrets = new Chilkat.Secrets();

// On Windows, this is the Windows Credentials Manager
// On MacOS/iOS, it is the Apple Keychain
secrets.Location = "local_manager";

// Specify the name of the secret.
// service and username are required.
// appName and domain are optional.
// Note: The values are arbitrary and can be anything you want.
Chilkat.JsonObject json = new Chilkat.JsonObject();
json.UpdateString("appName","MyEmailApp");
json.UpdateString("service","SMTP");
json.UpdateString("domain","example.com");
json.UpdateString("username","joe@example.com");

mailman.SmtpPassword = secrets.GetSecretStr(json);

// Send the encrypted email.
// The email is encrypted and sent within the SendEmail function.
success = mailman.SendEmail(email);
if (success != true) {
    Debug.WriteLine(mailman.LastErrorText);
    return;
}

Debug.WriteLine("Encrypted email sent!");