(Swift) 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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func chilkatTest() {
    let email = CkoEmail()!
    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.
    var recipientEmailAddr: String? = "jane@example2.com"
    email.add(to: "", emailAddress: recipientEmailAddr)

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

    let cert = CkoCert()!

    // -----------------------------------------------
    // 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.
    var success: Bool = cert.load(byEmailAddress: recipientEmailAddr)
    if success != true {
        print("\(cert.lastErrorText!)")
        return
    }

    // Specify the certificate to be used for encryption.
    success = email.setEncryptCert(cert)
    email.sendEncrypted = true

    let mailman = CkoMailMan()!
    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
    let secrets = CkoSecrets()!

    // 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.
    let json = CkoJsonObject()!
    json.update("appName", value: "MyEmailApp")
    json.update("service", value: "SMTP")
    json.update("domain", value: "example.com")
    json.update("username", value: "joe@example.com")

    mailman.smtpPassword = secrets.getSecretStr(json)

    // Send the encrypted email.
    // The email is encrypted and sent within the SendEmail function.
    success = mailman.send(email)
    if success != true {
        print("\(mailman.lastErrorText!)")
        return
    }

    print("Encrypted email sent!")

}