- load des.inc file only when needed

program/include/main.inc

@@ -30,7 +30,6 @@ require_once('lib/utf7.inc');
 require_once('include/rcube_shared.inc');
 
 // fallback if not PHP modules are available
-@include_once('lib/des.inc');
 @include_once('lib/utf8.class.php');
 
 // define constannts for input reading

program/include/rcmail.php

@@ -1064,22 +1064,24 @@ class rcmail
       mcrypt_generic_deinit($td);
       mcrypt_module_close($td);
     }
-    else if (function_exists('des'))
-    {
-      define('DES_IV_SIZE', 8);
+    else {
+      @include_once('lib/des.inc');
+
+      if (function_exists('des')) {
+        $des_iv_size = 8;
         $iv = '';
-      for ($i = 0; $i < constant('DES_IV_SIZE'); $i++)
+        for ($i = 0; $i < $des_iv_size; $i++)
           $iv .= sprintf("%c", mt_rand(0, 255));
         $cipher = $iv . des($this->config->get_crypto_key($key), $clear, 1, 1, $iv);
       }
-    else
-    {
+      else {
         raise_error(array(
           'code' => 500, 'type' => 'php',
           'file' => __FILE__, 'line' => __LINE__,
           'message' => "Could not perform encryption; make sure Mcrypt is installed or lib/des.inc is available"
         ), true, true);
       }
+    }
 
     return $base64 ? base64_encode($cipher) : $cipher;
   }
@@ -1110,21 +1112,23 @@ class rcmail
       mcrypt_generic_deinit($td);
       mcrypt_module_close($td);
     }
-    else if (function_exists('des'))
-    {
-      define('DES_IV_SIZE', 8);
-      $iv = substr($cipher, 0, constant('DES_IV_SIZE'));
-      $cipher = substr($cipher, constant('DES_IV_SIZE'));
+    else {
+      @include_once('lib/des.inc');
+    
+      if (function_exists('des')) {
+        $des_iv_size = 8;
+        $iv = substr($cipher, 0, $des_iv_size);
+        $cipher = substr($cipher, $des_iv_size);
         $clear = des($this->config->get_crypto_key($key), $cipher, 0, 1, $iv);
       }
-    else
-    {
+      else {
         raise_error(array(
           'code' => 500, 'type' => 'php',
           'file' => __FILE__, 'line' => __LINE__,
           'message' => "Could not perform decryption; make sure Mcrypt is installed or lib/des.inc is available"
         ), true, true);
       }
+    }
 
     /*-
      * Trim PHP's padding and the canary byte; see note in