| ------------------------------------------------------------------------------ |
| -- -- |
| -- 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, 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 -- |
| -- <http://www.gnu.org/licenses/>. -- |
| -- -- |
| -- 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; |
