--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/ada/libgnat/g-shshco.ads	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,66 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                         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) 2009-2017, 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;