Merge pull request #8655 from nextcloud/stable12-8630

[stable12] use hash algo that's robust against collisions

Author: rullzer

apps/user_ldap/lib/Connection.php

@@ -208,7 +208,7 @@ private function getCacheKey($key) {
 		if(is_null($key)) {
 			return $prefix;
 		}
-		return $prefix.md5($key);
+		return $prefix.hash('sha256', $key);
 	}
 
 	/**

apps/user_ldap/lib/Proxy.php

@@ -161,7 +161,7 @@ private function getCacheKey($key) {
 		if(is_null($key)) {
 			return $prefix;
 		}
-		return $prefix.md5($key);
+		return $prefix.hash('sha256', $key);
 	}
 
 	/**