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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;