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------------------------------------------------------------------------------ -- -- -- GNAT LIBRARY COMPONENTS -- -- -- -- G N A T . S E C U R E _ H A S H E S . S H A 2 _ 3 2 -- -- -- -- 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 support for the 32-bit FIPS PUB 180-3 functions -- SHA-224 and SHA-256. -- This is an internal unit and should not be used directly in applications. -- Use GNAT.SHA224 and GNAT.SHA256 instead. with Interfaces; with GNAT.Byte_Swapping; with GNAT.Secure_Hashes.SHA2_Common; package GNAT.Secure_Hashes.SHA2_32 is subtype Word is Interfaces.Unsigned_32; package Hash_State is new Hash_Function_State (Word => Word, Swap => GNAT.Byte_Swapping.Swap4, Hash_Bit_Order => System.High_Order_First); -- SHA-224 and SHA-256 operate on 32-bit big endian words K : constant Hash_State.State (0 .. 63) := (16#428a2f98#, 16#71374491#, 16#b5c0fbcf#, 16#e9b5dba5#, 16#3956c25b#, 16#59f111f1#, 16#923f82a4#, 16#ab1c5ed5#, 16#d807aa98#, 16#12835b01#, 16#243185be#, 16#550c7dc3#, 16#72be5d74#, 16#80deb1fe#, 16#9bdc06a7#, 16#c19bf174#, 16#e49b69c1#, 16#efbe4786#, 16#0fc19dc6#, 16#240ca1cc#, 16#2de92c6f#, 16#4a7484aa#, 16#5cb0a9dc#, 16#76f988da#, 16#983e5152#, 16#a831c66d#, 16#b00327c8#, 16#bf597fc7#, 16#c6e00bf3#, 16#d5a79147#, 16#06ca6351#, 16#14292967#, 16#27b70a85#, 16#2e1b2138#, 16#4d2c6dfc#, 16#53380d13#, 16#650a7354#, 16#766a0abb#, 16#81c2c92e#, 16#92722c85#, 16#a2bfe8a1#, 16#a81a664b#, 16#c24b8b70#, 16#c76c51a3#, 16#d192e819#, 16#d6990624#, 16#f40e3585#, 16#106aa070#, 16#19a4c116#, 16#1e376c08#, 16#2748774c#, 16#34b0bcb5#, 16#391c0cb3#, 16#4ed8aa4a#, 16#5b9cca4f#, 16#682e6ff3#, 16#748f82ee#, 16#78a5636f#, 16#84c87814#, 16#8cc70208#, 16#90befffa#, 16#a4506ceb#, 16#bef9a3f7#, 16#c67178f2#); -- Constants from FIPS PUB 180-3 function Sigma0 (X : Word) return Word; function Sigma1 (X : Word) return Word; function S0 (X : Word) return Word; function S1 (X : Word) return Word; pragma Inline (Sigma0, Sigma1, S0, S1); -- Elementary functions Sigma^256_0, Sigma^256_1, sigma^256_0, sigma^256_1 -- from FIPS PUB 180-3. procedure Transform is new SHA2_Common.Transform (Hash_State => Hash_State, K => K, Rounds => 64, Sigma0 => Sigma0, Sigma1 => Sigma1, S0 => S0, S1 => S1); SHA224_Init_State : constant Hash_State.State (0 .. 7) := (0 => 16#c1059ed8#, 1 => 16#367cd507#, 2 => 16#3070dd17#, 3 => 16#f70e5939#, 4 => 16#ffc00b31#, 5 => 16#68581511#, 6 => 16#64f98fa7#, 7 => 16#befa4fa4#); SHA256_Init_State : constant Hash_State.State (0 .. 7) := (0 => 16#6a09e667#, 1 => 16#bb67ae85#, 2 => 16#3c6ef372#, 3 => 16#a54ff53a#, 4 => 16#510e527f#, 5 => 16#9b05688c#, 6 => 16#1f83d9ab#, 7 => 16#5be0cd19#); -- Initialization vectors from FIPS PUB 180-3 end GNAT.Secure_Hashes.SHA2_32;