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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 _ 6 4 --
+-- --
+-- 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 64-bit FIPS PUB 180-3 functions
+-- SHA-384 and SHA-512.
+
+-- This is an internal unit and should not be used directly in applications.
+-- Use GNAT.SHA384 and GNAT.SHA512 instead.
+
+with Interfaces;
+with GNAT.Byte_Swapping;
+
+with GNAT.Secure_Hashes.SHA2_Common;
+
+package GNAT.Secure_Hashes.SHA2_64 is
+ subtype Word is Interfaces.Unsigned_64;
+
+ package Hash_State is new Hash_Function_State
+ (Word => Word,
+ Swap => GNAT.Byte_Swapping.Swap8,
+ Hash_Bit_Order => System.High_Order_First);
+ -- SHA-384 and SHA-512 operate on 64-bit big endian words
+
+ K : Hash_State.State (0 .. 79) :=
+ (16#428a2f98d728ae22#, 16#7137449123ef65cd#,
+ 16#b5c0fbcfec4d3b2f#, 16#e9b5dba58189dbbc#,
+ 16#3956c25bf348b538#, 16#59f111f1b605d019#,
+ 16#923f82a4af194f9b#, 16#ab1c5ed5da6d8118#,
+ 16#d807aa98a3030242#, 16#12835b0145706fbe#,
+ 16#243185be4ee4b28c#, 16#550c7dc3d5ffb4e2#,
+ 16#72be5d74f27b896f#, 16#80deb1fe3b1696b1#,
+ 16#9bdc06a725c71235#, 16#c19bf174cf692694#,
+ 16#e49b69c19ef14ad2#, 16#efbe4786384f25e3#,
+ 16#0fc19dc68b8cd5b5#, 16#240ca1cc77ac9c65#,
+ 16#2de92c6f592b0275#, 16#4a7484aa6ea6e483#,
+ 16#5cb0a9dcbd41fbd4#, 16#76f988da831153b5#,
+ 16#983e5152ee66dfab#, 16#a831c66d2db43210#,
+ 16#b00327c898fb213f#, 16#bf597fc7beef0ee4#,
+ 16#c6e00bf33da88fc2#, 16#d5a79147930aa725#,
+ 16#06ca6351e003826f#, 16#142929670a0e6e70#,
+ 16#27b70a8546d22ffc#, 16#2e1b21385c26c926#,
+ 16#4d2c6dfc5ac42aed#, 16#53380d139d95b3df#,
+ 16#650a73548baf63de#, 16#766a0abb3c77b2a8#,
+ 16#81c2c92e47edaee6#, 16#92722c851482353b#,
+ 16#a2bfe8a14cf10364#, 16#a81a664bbc423001#,
+ 16#c24b8b70d0f89791#, 16#c76c51a30654be30#,
+ 16#d192e819d6ef5218#, 16#d69906245565a910#,
+ 16#f40e35855771202a#, 16#106aa07032bbd1b8#,
+ 16#19a4c116b8d2d0c8#, 16#1e376c085141ab53#,
+ 16#2748774cdf8eeb99#, 16#34b0bcb5e19b48a8#,
+ 16#391c0cb3c5c95a63#, 16#4ed8aa4ae3418acb#,
+ 16#5b9cca4f7763e373#, 16#682e6ff3d6b2b8a3#,
+ 16#748f82ee5defb2fc#, 16#78a5636f43172f60#,
+ 16#84c87814a1f0ab72#, 16#8cc702081a6439ec#,
+ 16#90befffa23631e28#, 16#a4506cebde82bde9#,
+ 16#bef9a3f7b2c67915#, 16#c67178f2e372532b#,
+ 16#ca273eceea26619c#, 16#d186b8c721c0c207#,
+ 16#eada7dd6cde0eb1e#, 16#f57d4f7fee6ed178#,
+ 16#06f067aa72176fba#, 16#0a637dc5a2c898a6#,
+ 16#113f9804bef90dae#, 16#1b710b35131c471b#,
+ 16#28db77f523047d84#, 16#32caab7b40c72493#,
+ 16#3c9ebe0a15c9bebc#, 16#431d67c49c100d4c#,
+ 16#4cc5d4becb3e42b6#, 16#597f299cfc657e2a#,
+ 16#5fcb6fab3ad6faec#, 16#6c44198c4a475817#);
+ -- 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^512_0, Sigma^512_1, sigma^512_0, sigma^512_1
+ -- from FIPS PUB 180-3.
+
+ procedure Transform is new SHA2_Common.Transform
+ (Hash_State => Hash_State,
+ K => K,
+ Rounds => 80,
+ Sigma0 => Sigma0,
+ Sigma1 => Sigma1,
+ S0 => S0,
+ S1 => S1);
+
+ SHA384_Init_State : constant Hash_State.State :=
+ (0 => 16#cbbb9d5dc1059ed8#,
+ 1 => 16#629a292a367cd507#,
+ 2 => 16#9159015a3070dd17#,
+ 3 => 16#152fecd8f70e5939#,
+ 4 => 16#67332667ffc00b31#,
+ 5 => 16#8eb44a8768581511#,
+ 6 => 16#db0c2e0d64f98fa7#,
+ 7 => 16#47b5481dbefa4fa4#);
+ SHA512_Init_State : constant Hash_State.State :=
+ (0 => 16#6a09e667f3bcc908#,
+ 1 => 16#bb67ae8584caa73b#,
+ 2 => 16#3c6ef372fe94f82b#,
+ 3 => 16#a54ff53a5f1d36f1#,
+ 4 => 16#510e527fade682d1#,
+ 5 => 16#9b05688c2b3e6c1f#,
+ 6 => 16#1f83d9abfb41bd6b#,
+ 7 => 16#5be0cd19137e2179#);
+ -- Initialization vectors from FIPS PUB 180-3
+
+end GNAT.Secure_Hashes.SHA2_64;