Hi.
Sorry for my lamer question.
I want use MD5Sum function (from RFunc 2.1.3.1) in my database.
But I have some trouble in Firebird 2.0.3.
If I declare function as sql in folder sql in distrib

DECLARE EXTERNAL FUNCTION MD5SUM
CSTRING(16383)
RETURNS CSTRING(32) FREE_IT
ENTRY_POINT 'fn_md5sum' MODULE_NAME 'rfunc';

I get error incorrect datatype.
If I change size of cstring I get error when I try to use
this function
Function not exists, but dll in UDF folder, Server restarted.