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------------------------------------------------------------------------------
-- --
-- GNAT LIBRARY COMPONENTS --
-- --
-- G N A T . S H A 1 --
-- --
-- S p e c --
-- --
-- Copyright (C) 2002-2006, AdaCore --
-- --
-- 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 2, 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. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNAT; see file COPYING. If not, write --
-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
-- Boston, MA 02110-1301, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
-- This package implements the US Secure Hash Algorithm 1 (SHA1) as described
-- in RFC 3174. The complete text of RFC 3174 can be found at:
-- http://www.ietf.org/rfc/rfc3174.txt
-- Note: the code for this unit is derived from GNAT.MD5
with Ada.Streams;
with Interfaces;
package GNAT.SHA1 is
type Context is private;
-- This type holds the five-word (20 byte) buffer H, as described in
-- RFC 3174 (6.1). Its initial value is Initial_Context below.
Initial_Context : constant Context;
-- Initial value of a Context object. May be used to reinitialize
-- a Context value by simple assignment of this value to the object.
procedure Update
(C : in out Context;
Input : String);
procedure Wide_Update
(C : in out Context;
Input : Wide_String);
procedure Update
(C : in out Context;
Input : Ada.Streams.Stream_Element_Array);
-- Modify the Context C. If C has the initial value Initial_Context,
-- then, after a call to one of these procedures, Digest (C) will return
-- the Message-Digest of Input.
--
-- These procedures may be called successively with the same context and
-- different inputs, and these several successive calls will produce
-- the same final context as a call with the concatenation of the inputs.
subtype Message_Digest is String (1 .. 40);
-- The string type returned by function Digest
function Digest (C : Context) return Message_Digest;
-- Extracts the Message-Digest from a context. This function should be
-- used after one or several calls to Update.
function Digest (S : String) return Message_Digest;
function Wide_Digest (W : Wide_String) return Message_Digest;
function Digest
(A : Ada.Streams.Stream_Element_Array) return Message_Digest;
-- These functions are equivalent to the corresponding Update (or
-- Wide_Update) on a default initialized Context, followed by Digest
-- on the resulting Context.
private
-- Magic numbers
Initial_H0 : constant := 16#67452301#;
Initial_H1 : constant := 16#EFCDAB89#;
Initial_H2 : constant := 16#98BADCFE#;
Initial_H3 : constant := 16#10325476#;
Initial_H4 : constant := 16#C3D2E1F0#;
type H_Type is array (0 .. 4) of Interfaces.Unsigned_32;
Initial_H : constant H_Type :=
(0 => Initial_H0,
1 => Initial_H1,
2 => Initial_H2,
3 => Initial_H3,
4 => Initial_H4);
type Context is record
H : H_Type := Initial_H;
Buffer : String (1 .. 64) := (others => ASCII.NUL);
Last : Natural := 0;
Length : Natural := 0;
end record;
Initial_Context : constant Context :=
(H => Initial_H,
Buffer => (others => ASCII.NUL), Last => 0, Length => 0);
end GNAT.SHA1;
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