(dev/core#2258) Read+write SMTP password using 'crypto.token'

Before
------

The format of the 'smtpPassword' subfield depends on the available PECL extensions:

* The field is ciphertext... if PHP has `mcrypt` enabled
* The field is plaintext... if PHP has `mcrypt` disabled

After
-----

The format of the `smtpPassword` subfield is specified by `crypto.token` which means:

* The field is ciphertext... if it begins with `chr(2)`
* The field is plaintext... if it begins with any printable character

CRM/Admin/Form/Setting/Smtp.php

@@ -198,7 +198,7 @@ public function postProcess() {
 
     // if password is present, encrypt it
     if (!empty($formValues['smtpPassword'])) {
-      $formValues['smtpPassword'] = CRM_Utils_Crypt::encrypt($formValues['smtpPassword']);
+      $formValues['smtpPassword'] = \Civi::service('crypto.token')->encrypt($formValues['smtpPassword'], 'CRED');
     }
 
     Civi::settings()->set('mailing_backend', $formValues);
@@ -254,7 +254,7 @@ public function setDefaultValues() {
         $this->_defaults = $mailingBackend;
 
         if (!empty($this->_defaults['smtpPassword'])) {
-          $this->_defaults['smtpPassword'] = CRM_Utils_Crypt::decrypt($this->_defaults['smtpPassword']);
+          $this->_defaults['smtpPassword'] = \Civi::service('crypto.token')->decrypt($this->_defaults['smtpPassword']);
         }
       }
       else {

CRM/Utils/Mail.php

@@ -48,7 +48,7 @@ public static function createMailer() {
 
       if ($mailingInfo['smtpAuth']) {
         $params['username'] = $mailingInfo['smtpUsername'];
-        $params['password'] = CRM_Utils_Crypt::decrypt($mailingInfo['smtpPassword']);
+        $params['password'] = \Civi::service('crypto.token')->decrypt($mailingInfo['smtpPassword']);
         $params['auth'] = TRUE;
       }
       else {