6cbcc54138
* xeinfo.adb: Don't look for revision numbers. * xnmake.adb: Likewise. * xsinfo.adb: Likewise. * xsnames.adb: Likewise. * xtreeprs.adb: Likewise. From-SVN: r50768
107 lines
5.1 KiB
Ada
107 lines
5.1 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT LIBRARY COMPONENTS --
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-- --
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-- G N A T . M D 5 --
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-- --
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-- S p e c --
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-- --
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-- --
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-- Copyright (C) 2002 Ada Core Technologies, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 2, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNAT; see file COPYING. If not, write --
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-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
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-- MA 02111-1307, USA. --
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-- --
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-- As a special exception, if other files instantiate generics from this --
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-- unit, or you link this unit with other files to produce an executable, --
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-- this unit does not by itself cause the resulting executable to be --
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-- covered by the GNU General Public License. This exception does not --
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-- however invalidate any other reasons why the executable file might be --
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-- covered by the GNU Public License. --
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-- --
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-- GNAT is maintained by Ada Core Technologies Inc (http://www.gnat.com). --
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-- --
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------------------------------------------------------------------------------
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--
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-- This package implements the MD5 Message-Digest Algorithm as described in
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-- RFC 1321. The complete text of RFC 1321 can be found at:
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--
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-- http://www.ietf.org/rfc/rfc1321.txt
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--
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-- The implementation is derived from the RSA Data Secutity, Inc. MD5
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-- Message-Digest Algorithm, as described in RFC 1321.
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with Ada.Streams;
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with Interfaces;
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package GNAT.MD5 is
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type Context is private;
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-- This type is the four-word (16 byte) MD buffer, as described in
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-- RFC 1321 (3.3). It initial value is Initial_Context below.
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Initial_Context : constant Context;
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-- Initial value of a Context object. May be used to reinitialize
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-- a Context value by simple assignment of this value to the object.
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procedure Update
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(C : in out Context;
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Input : String);
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procedure Wide_Update
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(C : in out Context;
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Input : Wide_String);
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procedure Update
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(C : in out Context;
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Input : Ada.Streams.Stream_Element_Array);
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-- Modify the Context C. If C has the initial value Initial_Context,
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-- then, after a call to one of these procedures, Digest (C) will return
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-- the Message-Digest of Input.
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--
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-- These procedures may be called successively with the same context and
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-- different inputs. However, several successive calls will not produce
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-- the same final context as a call with the concatenation of the inputs.
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subtype Message_Digest is String (1 .. 32);
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-- The string type returned by function Digest.
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function Digest (C : Context) return Message_Digest;
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-- Extracts the Message-Digest from a context. This function should be
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-- used after one or several calls to Update.
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function Digest (S : String) return Message_Digest;
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function Wide_Digest (W : Wide_String) return Message_Digest;
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function Digest
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(A : Ada.Streams.Stream_Element_Array)
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return Message_Digest;
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-- These functions are equivalent to the corresponding Update (or
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-- Wide_Update) on a default initialized Context, followed by Digest
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-- on the resulting Context.
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private
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-- Magic numbers
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Initial_A : constant := 16#67452301#;
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Initial_B : constant := 16#EFCDAB89#;
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Initial_C : constant := 16#98BADCFE#;
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Initial_D : constant := 16#10325476#;
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type Context is record
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A : Interfaces.Unsigned_32 := Initial_A;
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B : Interfaces.Unsigned_32 := Initial_B;
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C : Interfaces.Unsigned_32 := Initial_C;
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D : Interfaces.Unsigned_32 := Initial_D;
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end record;
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Initial_Context : constant Context :=
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(A => Initial_A, B => Initial_B, C => Initial_C, D => Initial_D);
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end GNAT.MD5;
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