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------------------------------------------------------------------------------
-- --
-- GNAT LIBRARY COMPONENTS --
-- --
-- G N A T . M D 5 --
-- --
-- S p e c --
-- --
-- Copyright (C) 2002-2004 Ada Core Technologies, 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 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 MD5 Message-Digest Algorithm as described in
-- RFC 1321. The complete text of RFC 1321 can be found at:
--
-- http://www.ietf.org/rfc/rfc1321.txt
--
-- The implementation is derived from the RSA Data Secutity, Inc. MD5
-- Message-Digest Algorithm, as described in RFC 1321.
with Ada.Streams;
with Interfaces;
package GNAT.MD5 is
type Context is private;
-- This type is the four-word (16 byte) MD buffer, as described in
-- RFC 1321 (3.3). It 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 .. 32);
-- 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_A : constant := 16#67452301#;
Initial_B : constant := 16#EFCDAB89#;
Initial_C : constant := 16#98BADCFE#;
Initial_D : constant := 16#10325476#;
type Context is record
A : Interfaces.Unsigned_32 := Initial_A;
B : Interfaces.Unsigned_32 := Initial_B;
C : Interfaces.Unsigned_32 := Initial_C;
D : Interfaces.Unsigned_32 := Initial_D;
Buffer : String (1 .. 64) := (others => ASCII.NUL);
Last : Natural := 0;
Length : Natural := 0;
end record;
Initial_Context : constant Context :=
(A => Initial_A, B => Initial_B, C => Initial_C, D => Initial_D,
Buffer => (others => ASCII.NUL), Last => 0, Length => 0);
end GNAT.MD5;
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