| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT LIBRARY COMPONENTS -- |
| -- -- |
| -- G N A T . S E C U R E _ H A S H E S . S H A 1 -- |
| -- -- |
| -- S p e c -- |
| -- -- |
| -- Copyright (C) 2002-2021, 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 -- |
| -- <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 SHA-1 |
| -- secure hash function as described in FIPS PUB 180-3. 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.SHA1 instead. |
| |
| with GNAT.Byte_Swapping; |
| with Interfaces; |
| |
| package GNAT.Secure_Hashes.SHA1 is |
| |
| package Hash_State is new Hash_Function_State |
| (Word => Interfaces.Unsigned_32, |
| Swap => GNAT.Byte_Swapping.Swap4, |
| Hash_Bit_Order => System.High_Order_First); |
| -- SHA-1 operates on 32-bit big endian words |
| |
| Block_Words : constant := 16; |
| -- Messages are processed in chunks of 16 words |
| |
| procedure Transform |
| (H : in out Hash_State.State; |
| M : in out Message_State); |
| -- Transformation function applied for each block |
| |
| Initial_State : constant Hash_State.State; |
| -- Initialization vector |
| |
| private |
| |
| Initial_State : constant Hash_State.State := |
| (0 => 16#67452301#, |
| 1 => 16#EFCDAB89#, |
| 2 => 16#98BADCFE#, |
| 3 => 16#10325476#, |
| 4 => 16#C3D2E1F0#); |
| -- Initialization vector from FIPS PUB 180-3 |
| |
| end GNAT.Secure_Hashes.SHA1; |
