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-- Copyright (c) 2014, Natacha Porté --
-- --
-- Permission to use, copy, modify, and distribute this software for any --
-- purpose with or without fee is hereby granted, provided that the above --
-- copyright notice and this permission notice appear in all copies. --
-- --
-- THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES --
-- WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF --
-- MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR --
-- ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES --
-- WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN --
-- ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF --
-- OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. --
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-- Natools.HMAC provides an implementation of keyed-hash message --
-- authentication code (HMAC) based on cryptographic hash function provided --
-- as formal parameters. --
------------------------------------------------------------------------------
with Ada.Streams;
generic
type Hash_Context is private;
Initial_Context : in Hash_Context;
with procedure Update
(Context : in out Hash_Context;
Input : in Ada.Streams.Stream_Element_Array);
with function Digest (Context : Hash_Context)
return Ada.Streams.Stream_Element_Array;
Block_Size_In_SE : in Ada.Streams.Stream_Element_Count;
package Natools.HMAC is
type Context is private;
procedure Setup
(C : out Context;
Key : in Ada.Streams.Stream_Element_Array);
procedure Setup
(C : out Context;
Key : in String);
-- Reset C with the given Key
function Create (Key : Ada.Streams.Stream_Element_Array) return Context;
function Create (Key : String) return Context;
-- Create a new Context initialized with the given Key.
-- This is equivalent to calling Setup on the returned object.
procedure Update
(C : in out Context;
Input : in Ada.Streams.Stream_Element_Array);
procedure Update
(C : in out Context;
Input : in String);
-- Append Input to the HMACed message
function Digest (C : Context) return Ada.Streams.Stream_Element_Array;
-- Return the HMAC of the message given to C
function Digest (Key : String; Message : Ada.Streams.Stream_Element_Array)
return Ada.Streams.Stream_Element_Array;
function Digest (Key, Message : Ada.Streams.Stream_Element_Array)
return Ada.Streams.Stream_Element_Array;
-- Return directly the HMAC of Message with the given Key
private
type Context is record
Key : Ada.Streams.Stream_Element_Array (1 .. Block_Size_In_SE);
Hash : Hash_Context;
end record;
end Natools.HMAC;