------------------------------------------------------------------------------ -- -- -- GNAT LIBRARY COMPONENTS -- -- -- -- G N A T . S E C U R E _ H A S H E S . S H A 2 _ C O M M O N -- -- -- -- S p e c -- -- -- -- Copyright (C) 2009-2021, Free Software Foundation, Inc. -- -- -- -- GNAT is free software; you can redistribute it and/or modify it under -- -- terms of the GNU General Public License as published by the Free Soft- -- -- ware Foundation; either version 3, or (at your option) any later ver- -- -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- -- or FITNESS FOR A PARTICULAR PURPOSE. -- -- -- -- As a special exception under Section 7 of GPL version 3, you are granted -- -- additional permissions described in the GCC Runtime Library Exception, -- -- version 3.1, as published by the Free Software Foundation. -- -- -- -- You should have received a copy of the GNU General Public License and -- -- a copy of the GCC Runtime Library Exception along with this program; -- -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- -- . -- -- -- -- GNAT was originally developed by the GNAT team at New York University. -- -- Extensive contributions were provided by Ada Core Technologies Inc. -- -- -- ------------------------------------------------------------------------------ -- This package provides supporting code for implementation of the following -- secure hash functions described in FIPS PUB 180-3: SHA-224, SHA-256, -- SHA-384, SHA-512. It contains the generic transform operation that is -- common to the above four functions. The complete text of FIPS PUB 180-3 -- can be found at: -- http://csrc.nist.gov/publications/fips/fips180-3/fips180-3_final.pdf -- This is an internal unit and should not be used directly in applications. -- Use GNAT.SHA* instead. package GNAT.Secure_Hashes.SHA2_Common is Block_Words : constant := 16; -- All functions operate on blocks of 16 words generic with package Hash_State is new Hash_Function_State (<>); Rounds : Natural; -- Number of transformation rounds K : Hash_State.State; -- Constants used in the transform operation with function Sigma0 (X : Hash_State.Word) return Hash_State.Word is <>; with function Sigma1 (X : Hash_State.Word) return Hash_State.Word is <>; with function S0 (X : Hash_State.Word) return Hash_State.Word is <>; with function S1 (X : Hash_State.Word) return Hash_State.Word is <>; -- FIPS PUB 180-3 elementary functions procedure Transform (H_St : in out Hash_State.State; M_St : in out Message_State); end GNAT.Secure_Hashes.SHA2_Common;