C#

SMTP Login Secure

Demonstrates how to set the SMTP password using a secure string.

This example requires Chilkat v9.5.0.71 or greater.

C#

bool success = false;

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

Chilkat.MailMan mailman = new Chilkat.MailMan();

// Imagine we've previously saved our encrypted login and password within a JSON config file
// that contains this:

// {
//   "smtp_login": "D7lnlWY291LKMeChlvQq7N/Tg7ieuSB15a+9Ekyd0R4=",
//   "smtp_password": "5neIq9Jmn0E3p71N6Yc8TA=="
// }

Chilkat.JsonObject json = new Chilkat.JsonObject();
json.LoadFile("qa_data/passwords/smtp.json");

Chilkat.Crypt2 crypt = new Chilkat.Crypt2();

// These are the encryption settings we previously used to encrypt the credentials within the JSON config file.
crypt.CryptAlgorithm = "aes";
crypt.CipherMode = "cbc";
crypt.KeyLength = 128;
crypt.SetEncodedKey("000102030405060708090A0B0C0D0E0F","hex");
crypt.SetEncodedIV("000102030405060708090A0B0C0D0E0F","hex");
crypt.EncodingMode = "base64";

Chilkat.SecureString ssLogin = new Chilkat.SecureString();
Chilkat.SecureString ssPassword = new Chilkat.SecureString();

// Decrypt to the secure string.  (the strings will still held in memory encrypted, but are now encrypted using
// a randomly generated session key.)
crypt.DecryptSecureENC(json.StringOf("smtp_login"),ssLogin);
crypt.DecryptSecureENC(json.StringOf("smtp_password"),ssPassword);

// Set the SMTP domain, login, and password
mailman.SmtpHost = "smtp.gmail.com";
mailman.SmtpSsl = true;
mailman.SmtpPort = 465;

mailman.SmtpUsername = ssLogin.Access();
// Set the SmtpPassword property via the SetPassword method using the secure string.
mailman.SetPassword("smtp",ssPassword);

// Connect and authenticate..
success = mailman.SmtpConnect();
if (success != true) {
    Debug.WriteLine(mailman.LastErrorText);
    return;
}

success = mailman.SmtpAuthenticate();
if (success != true) {
    Debug.WriteLine(mailman.LastErrorText);
    return;
}

Debug.WriteLine("SMTP login successful.");

// ...

mailman.CloseSmtpConnection();