Fix for random byte generation in MIME email messages

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@1789 44740490-163a-0410-bde0-09ae8108e29a

lib/SimpleSAML/XHTML/EMail.php

@@ -66,7 +66,7 @@ pre {
 		if ($this->subject == NULL) throw new Exception('EMail field [subject] is required and not set.');
 		if ($this->body == NULL) throw new Exception('EMail field [body] is required and not set.');
 		
-		$random_hash = substr(0, 16, md5(date('r', time())));
+		$random_hash = SimpleSAML_Utilities::stringToHex(SimpleSAML_Utilities::generateRandomBytes(16));
 		
 		if (isset($this->from))
 			$this->headers[]= 'From: ' . $this->from;