Using a more widely available cipher & mode for test_initialize_encry…

…pt_decrypt() (newer PHP versions)

tests/codeigniter/libraries/Encryption_test.php

@@ -208,7 +208,7 @@ public function test_initialize_encrypt_decrypt()
 		$this->assertEquals($message, $this->encryption->decrypt($this->encryption->encrypt($message)));
 
 		// Try DES in ECB mode, just for the sake of changing stuff
-		$this->encryption->initialize(array('cipher' => 'des', 'mode' => 'ecb', 'key' => substr($key, 0, 8)));
+		$this->encryption->initialize(array('cipher' => 'tripledes', 'mode' => 'ofb', 'key' => substr($key, 0, 8)));
 		$this->assertEquals($message, $this->encryption->decrypt($this->encryption->encrypt($message)));
 	}