(Go) 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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    email := chilkat.NewEmail()
    email.SetSubject("This email is encrypted")
    email.SetBody("This is a S/MIME encrypted mail")
    email.SetFrom("Joe <joe@example.com>")

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

    // Indicate that the email is to be sent encrypted.
    email.SetSendEncrypted(true)

    cert := chilkat.NewCert()

    // -----------------------------------------------
    // 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.
    success := cert.LoadByEmailAddress(recipientEmailAddr)
    if success != true {
        fmt.Println(cert.LastErrorText())
        email.DisposeEmail()
        cert.DisposeCert()
        return
    }

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

    mailman := chilkat.NewMailMan()
    mailman.SetSmtpHost("smtp.example.com")
    mailman.SetSmtpUsername("joe@example.com")
    mailman.SetSmtpPort(587)
    mailman.SetStartTLS(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
    secrets := chilkat.NewSecrets()

    // On Windows, this is the Windows Credentials Manager
    // On MacOS/iOS, it is the Apple Keychain
    secrets.SetLocation("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.
    json := chilkat.NewJsonObject()
    json.UpdateString("appName","MyEmailApp")
    json.UpdateString("service","SMTP")
    json.UpdateString("domain","example.com")
    json.UpdateString("username","joe@example.com")

    mailman.SetSmtpPassword(secrets.GetSecretStr(json))

    // Send the encrypted email.
    // The email is encrypted and sent within the SendEmail function.
    success = mailman.SendEmail(email)
    if success != true {
        fmt.Println(mailman.LastErrorText())
        email.DisposeEmail()
        cert.DisposeCert()
        mailman.DisposeMailMan()
        secrets.DisposeSecrets()
        json.DisposeJsonObject()
        return
    }

    fmt.Println("Encrypted email sent!")

    email.DisposeEmail()
    cert.DisposeCert()
    mailman.DisposeMailMan()
    secrets.DisposeSecrets()
    json.DisposeJsonObject()