------------------------------------------------------------------------------ ------------------------------------------------------------------------------ -- This file is part of 'Finite Field Arithmetic', aka 'FFA'. -- -- -- -- (C) 2017 Stanislav Datskovskiy ( www.loper-os.org ) -- -- http://wot.deedbot.org/17215D118B7239507FAFED98B98228A001ABFFC7.html -- -- -- -- You do not have, nor can you ever acquire the right to use, copy or -- -- distribute this software ; Should you use this software for any purpose, -- -- or copy and distribute it to anyone or in any manner, you are breaking -- -- the laws of whatever soi-disant jurisdiction, and you promise to -- -- continue doing so for the indefinite future. In any case, please -- -- always : read and understand any software ; verify any PGP signatures -- -- that you use - for any purpose. -- -- -- -- See also http://trilema.com/2015/a-new-software-licensing-paradigm . -- ------------------------------------------------------------------------------ ------------------------------------------------------------------------------ with Words; use Words; with FZ_Type; use FZ_Type; package FZ_Basic is pragma Pure; -- N := 0 procedure FZ_Clear(N : out FZ); -- Set given FZ to a given truth value procedure WBool_To_FZ(V : in WBool; N : out FZ); -- First word of N := Source procedure FZ_Set_Head(N : out FZ; Source : in Word); -- First word of N function FZ_Get_Head(N : in FZ) return Word; -- Exchange X and Y procedure FZ_Swap(X : in out FZ; Y : in out FZ); pragma Precondition(X'Length = Y'Length); -- Constant-time MUX: Sel = 0: Result := X; Sel = 1: Result := Y procedure FZ_Mux(X : in FZ; Y : in FZ; Result : out FZ; Sel : in WBool); pragma Precondition(X'Length = Y'Length and X'Length = Result'Length); end FZ_Basic;