| ------------------------------------------------------------------------------ |
| -- -- |
| -- 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; |
