steelcrypt/src/algorithms/pi-cipher/pi64cipher_spec.ads

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3.4 KiB
Ada

-- Copyright (C) 2015 Daniel Otte <bg@nerilex.org>
--
-- This program is free software: you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation, either version 3 of the License, or
-- (at your option) any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT 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
-- along with this program. If not, see <http://www.gnu.org/licenses/>.
with Crypto_Core_Types; use Crypto_Core_Types;
package Pi64Cipher_Spec is
type Context_T is private;
Cipher_Name : constant String := "pi64cipher";
Width_Bits : constant := 64;
N : constant := 4;
R : constant := 3;
IS_Bits : constant := (N * 4 * Width_Bits);
IS_Bytes : constant := IS_Bits / 8;
Rate_Bits : constant := IS_Bits / 2;
Rate_Bytes : constant := Rate_Bits / 8;
Capacity_Bits : constant := IS_Bits - Rate_Bits;
Capacity_Bytes : constant := Capacity_Bits / 8;
Block_Bits : constant := Rate_Bits;
Block_Bytes : constant := Block_Bits / 8;
Tag_Bits : constant := Rate_Bits;
Tag_Bytes : constant := Tag_Bits / 8;
Secret_Message_Number_Bits : constant := Block_Bits;
Secret_Message_Number_Bytes : constant := Secret_Message_Number_Bits / 8;
subtype Block_Number_T is Natural;
subtype Block_T is u8_Array (1 .. Rate_Bytes);
subtype Tag_T is u8_Array(1 .. Rate_Bytes);
procedure Initialize(Context : out Context_T; Key : in u8_Array; Public_Nonce : in u8_Array);
procedure Process_Header_Block (Context : in out Context_T; Block : Block_T; Block_Number : Block_Number_T);
procedure Process_Header_Last_Block (Context : in out Context_T; Block : u8_Array; Block_Number : Block_Number_T);
procedure Encrypt_Secret_Message_Number(Context : in out Context_T; Block : in out u8_Array);
procedure Decrypt_Secret_Message_Number(Context : in out Context_T; Block : in out u8_Array);
procedure Encrypt_Block(Context : in out Context_T; Block : in out Block_T; Block_Number : Block_Number_T);
procedure Decrypt_Block(Context : in out Context_T; Block : in out Block_T; Block_Number : Block_Number_T);
procedure Encrypt_Last_Block(Context : in out Context_T; Block : in out u8_Array; Block_Number : Block_Number_T);
procedure Decrypt_Last_Block(Context : in out Context_T; Block : in out u8_Array; Block_Number : Block_Number_T);
function Get_Tag(Context : Context_T) return Tag_T;
function Is_Valid(Is_Tag : in Tag_T; Should_Tag : in Tag_T) return Boolean;
function Is_Valid(Context : in Context_T; Should_Tag : in Tag_T) return Boolean;
function Encrypt(Msg : u8_Array; AD : u8_Array; Public_Nonce : u8_Array; Secret_Nonce : u8_Array; Key : u8_Array) return u8_Array;
procedure Decrypt(Is_Valid : out Boolean; Msg : out u8_Array; Secret_Nonce : out u8_Array; Cipher : in u8_Array; AD : in u8_Array; Public_Nonce : in u8_Array; Key : in u8_Array);
private
subtype Word_T is u64;
subtype Chunk_T is u64_Array(1 .. 4);
subtype Tag_Int_T is u64_Array(1 .. 4 * N / 2);
type State_T is array (1 .. N) of Chunk_T;
type Context_T is record
State : State_T;
Tag : Tag_Int_T;
Counter : u64;
end record;
end Pi64Cipher_Spec;