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364 | -- Copyright (c) 2020 Maxim Reznik <reznikmm@gmail.com>
--
-- SPDX-License-Identifier: MIT
-- License-Filename: LICENSE
-------------------------------------------------------------
separate (JWS.RS256)
package body Read_DER is
use type Ada.Streams.Stream_Element;
use type Ada.Streams.Stream_Element_Count;
procedure Algorithm
(Input : Ada.Streams.Stream_Element_Array;
J : in out Ada.Streams.Stream_Element_Count);
procedure Expect
(Input : Ada.Streams.Stream_Element_Array;
J : in out Ada.Streams.Stream_Element_Count;
Item : Ada.Streams.Stream_Element);
procedure Get_Length
(Input : Ada.Streams.Stream_Element_Array;
J : in out Ada.Streams.Stream_Element_Count;
Length : out Ada.Streams.Stream_Element_Count);
function Get_Integer
(Input : Ada.Streams.Stream_Element_Array;
J : in out Ada.Streams.Stream_Element_Count)
return JWS.Integers.Number;
procedure PrivateKeyAlgorithmIdentifier
(Input : Ada.Streams.Stream_Element_Array;
J : in out Ada.Streams.Stream_Element_Count);
function RSAPrivateKey
(Input : Ada.Streams.Stream_Element_Array;
J : in out Ada.Streams.Stream_Element_Count) return Private_Key;
function PrivateKey
(Input : Ada.Streams.Stream_Element_Array;
J : in out Ada.Streams.Stream_Element_Count) return Private_Key;
function OneAsymmetricKey
(Input : Ada.Streams.Stream_Element_Array;
J : in out Ada.Streams.Stream_Element_Count) return Private_Key;
function Public_Key_String
(Input : Ada.Streams.Stream_Element_Array;
J : in out Ada.Streams.Stream_Element_Count) return Public_Key;
function RSAPublicKey
(Input : Ada.Streams.Stream_Element_Array;
J : in out Ada.Streams.Stream_Element_Count) return Public_Key;
---------------
-- Algorithm --
---------------
procedure Algorithm
(Input : Ada.Streams.Stream_Element_Array;
J : in out Ada.Streams.Stream_Element_Count)
is
RSA_Id : constant Ada.Streams.Stream_Element_Array :=
(16#06#, 16#09#, 16#2A#, 16#86#, 16#48#, 16#86#,
16#F7#, 16#0D#, 16#01#, 16#01#, 16#01#);
Null_Params : constant Ada.Streams.Stream_Element_Array :=
(05, 00); -- NULL
begin
for X of RSA_Id loop
Expect (Input, J, X);
end loop;
for X of Null_Params loop
Expect (Input, J, X);
end loop;
end Algorithm;
------------
-- Expect --
------------
procedure Expect
(Input : Ada.Streams.Stream_Element_Array;
J : in out Ada.Streams.Stream_Element_Count;
Item : Ada.Streams.Stream_Element) is
begin
if Input (J) = Item then
J := J + 1;
else
raise Constraint_Error;
end if;
end Expect;
-----------------
-- Get_Integer --
-----------------
function Get_Integer
(Input : Ada.Streams.Stream_Element_Array;
J : in out Ada.Streams.Stream_Element_Count)
return JWS.Integers.Number
is
Length : Ada.Streams.Stream_Element_Count;
Last : Ada.Streams.Stream_Element_Count;
Count : Positive;
begin
Expect (Input, J, 2); -- Integer
Get_Length (Input, J, Length);
Last := J + Length - 1;
Count := JWS.Integers.BER_Length (Input (J .. Last));
return Result : JWS.Integers.Number (1 .. Count) do
JWS.Integers.BER_Decode (Input (J .. Last), Result);
J := Last + 1;
end return;
end Get_Integer;
----------------
-- Get_Length --
----------------
procedure Get_Length
(Input : Ada.Streams.Stream_Element_Array;
J : in out Ada.Streams.Stream_Element_Count;
Length : out Ada.Streams.Stream_Element_Count)
is
begin
Length := Ada.Streams.Stream_Element_Count (Input (J));
if Length >= 128 then
declare
P : Ada.Streams.Stream_Element_Array renames
Input (J + 1 .. J + Length - 128);
begin
Length := 0;
J := P'Last + 1;
for B of P loop
Length := Length * 256 + Ada.Streams.Stream_Element_Count (B);
end loop;
end;
else
J := J + 1;
end if;
end Get_Length;
----------------------
-- OneAsymmetricKey --
----------------------
function OneAsymmetricKey
(Input : Ada.Streams.Stream_Element_Array;
J : in out Ada.Streams.Stream_Element_Count) return Private_Key
is
Length : Ada.Streams.Stream_Element_Count;
Last : Ada.Streams.Stream_Element_Count;
begin
Expect (Input, J, 16#30#); -- SEQUENCE
Get_Length (Input, J, Length);
Last := J + Length;
declare
Version : constant JWS.Integers.Number := Get_Integer (Input, J);
begin
pragma Assert (Version in (1 => 0));
PrivateKeyAlgorithmIdentifier (Input, J);
end;
return R : constant Private_Key := PrivateKey (Input, J) do
pragma Assert (J = Last);
end return;
end OneAsymmetricKey;
----------------
-- PrivateKey --
----------------
function PrivateKey
(Input : Ada.Streams.Stream_Element_Array;
J : in out Ada.Streams.Stream_Element_Count) return Private_Key
is
Length : Ada.Streams.Stream_Element_Count;
Last : Ada.Streams.Stream_Element_Count;
begin
Expect (Input, J, 16#04#); -- OCTET STRING
Get_Length (Input, J, Length);
Last := J + Length;
return R : constant Private_Key := RSAPrivateKey (Input, J) do
pragma Assert (J = Last);
end return;
end PrivateKey;
-----------------------------------
-- PrivateKeyAlgorithmIdentifier --
-----------------------------------
procedure PrivateKeyAlgorithmIdentifier
(Input : Ada.Streams.Stream_Element_Array;
J : in out Ada.Streams.Stream_Element_Count)
is
Length : Ada.Streams.Stream_Element_Count;
Last : Ada.Streams.Stream_Element_Count;
begin
Expect (Input, J, 16#30#); -- SEQUENCE
Get_Length (Input, J, Length);
Last := J + Length;
Algorithm (Input, J);
pragma Assert (J = Last);
end PrivateKeyAlgorithmIdentifier;
-----------------------
-- Public_Key_String --
-----------------------
function Public_Key_String
(Input : Ada.Streams.Stream_Element_Array;
J : in out Ada.Streams.Stream_Element_Count)
return Public_Key
is
Length : Ada.Streams.Stream_Element_Count;
Last : Ada.Streams.Stream_Element_Count;
begin
Expect (Input, J, 16#03#); -- BIT STRING
Get_Length (Input, J, Length);
Last := J + Length;
Expect (Input, J, 16#00#); -- EOC
return R : constant Public_Key := RSAPublicKey (Input, J) do
pragma Assert (J = Last);
end return;
end Public_Key_String;
----------------------
-- Read_Private_Key --
----------------------
function Read_Private_Key
(Input : Ada.Streams.Stream_Element_Array)
return Private_Key
is
J : Ada.Streams.Stream_Element_Count := Input'First;
begin
return OneAsymmetricKey (Input, J);
end Read_Private_Key;
---------------------
-- Read_Public_Key --
---------------------
function Read_Public_Key
(Input : Ada.Streams.Stream_Element_Array)
return Public_Key
is
J : Ada.Streams.Stream_Element_Count := Input'First;
Length : Ada.Streams.Stream_Element_Count;
Last : Ada.Streams.Stream_Element_Count;
begin
Expect (Input, J, 16#30#); -- SEQUENCE
Get_Length (Input, J, Length);
Last := J + Length;
PrivateKeyAlgorithmIdentifier (Input, J);
return R : constant Public_Key := Public_Key_String (Input, J) do
pragma Assert (J = Last);
end return;
end Read_Public_Key;
-------------------
-- RSAPrivateKey --
-------------------
function RSAPrivateKey
(Input : Ada.Streams.Stream_Element_Array;
J : in out Ada.Streams.Stream_Element_Count) return Private_Key
is
Length : Ada.Streams.Stream_Element_Count;
Last : Ada.Streams.Stream_Element_Count;
begin
Expect (Input, J, 16#30#); -- SEQUENCE
Get_Length (Input, J, Length);
Last := J + Length;
declare
Version : constant JWS.Integers.Number := Get_Integer (Input, J);
begin
pragma Assert (Version in (1 => 0));
end;
declare
Modulus : constant JWS.Integers.Number :=
Get_Integer (Input, J);
Public_Exponent : constant JWS.Integers.Number :=
Get_Integer (Input, J);
Private_Exponent : constant JWS.Integers.Number :=
Get_Integer (Input, J);
Prime_1 : constant JWS.Integers.Number :=
Get_Integer (Input, J);
Prime_2 : constant JWS.Integers.Number :=
Get_Integer (Input, J);
Exponent_1 : constant JWS.Integers.Number :=
Get_Integer (Input, J);
Exponent_2 : constant JWS.Integers.Number :=
Get_Integer (Input, J);
Coefficient : constant JWS.Integers.Number :=
Get_Integer (Input, J);
begin
pragma Assert (J = Last);
return
(N => Modulus'Last,
E => Public_Exponent'Last,
D => Private_Exponent'Last,
P => Prime_1'Last,
Q => Prime_2'Last,
E1 => Exponent_1'Last,
E2 => Exponent_2'Last,
C => Coefficient'Last,
Modulus => Modulus,
Public_Exponent => Public_Exponent,
Private_Exponent => Private_Exponent,
Prime_1 => Prime_1,
Prime_2 => Prime_2,
Exponent_1 => Exponent_1,
Exponent_2 => Exponent_2,
Coefficient => Coefficient);
end;
end RSAPrivateKey;
------------------
-- RSAPublicKey --
------------------
function RSAPublicKey
(Input : Ada.Streams.Stream_Element_Array;
J : in out Ada.Streams.Stream_Element_Count) return Public_Key
is
Length : Ada.Streams.Stream_Element_Count;
Last : Ada.Streams.Stream_Element_Count;
begin
Expect (Input, J, 16#30#); -- SEQUENCE
Get_Length (Input, J, Length);
Last := J + Length;
declare
Modulus : constant JWS.Integers.Number := Get_Integer (Input, J);
Exponent : constant JWS.Integers.Number := Get_Integer (Input, J);
begin
pragma Assert (J = Last);
return (N => Modulus'Last,
E => Exponent'Last,
Modulus => Modulus,
Public_Exponent => Exponent);
end;
end RSAPublicKey;
end Read_DER;
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