http://bugs.winehq.org/show_bug.cgi?id=22064
--- Comment #61 from Hans Leidekker hans@meelstraat.net 2010-08-30 09:16:49 CDT --- Created an attachment (id=30483) --> (http://bugs.winehq.org/attachment.cgi?id=30483) secur32: Return header and trailer buffer from DecryptMessage (schannel).
Does this patch work for you?