From de41f143e62346f2b1fce2ede32f06b860734f33 Mon Sep 17 00:00:00 2001
From: Stephen Paul Weber <singpolyma@singpolyma.net>
Date: Tue, 26 Jul 2016 18:44:49 -0500
Subject: [PATCH] Throw exception if using CAST5 without mcrypt

---
 lib/openpgp_crypt_symmetric.php | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/openpgp_crypt_symmetric.php b/lib/openpgp_crypt_symmetric.php
index 120d4d9..844c53b 100644
--- a/lib/openpgp_crypt_symmetric.php
+++ b/lib/openpgp_crypt_symmetric.php
@@ -154,6 +154,8 @@ class OpenPGP_Crypt_Symmetric {
       case 3:
         if(defined('MCRYPT_CAST_128')) {
           $cipher = new MCryptWrapper(MCRYPT_CAST_128);
+        } else {
+          throw new Exception("Unsupported cipher: you must have mcrypt installed to use CAST5");
         }
         break;
       case 7: