76 lines
3.1 KiB
Ada
76 lines
3.1 KiB
Ada
-- Copyright (C) 2015 Daniel Otte <bg@nerilex.org>
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--
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-- This program is free software: you can redistribute it and/or modify
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-- it under the terms of the GNU General Public License as published by
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-- the Free Software Foundation, either version 3 of the License, or
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-- (at your option) any later version.
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--
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-- This program is distributed in the hope that it will be useful,
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of
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-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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-- GNU General Public License for more details.
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--
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-- You should have received a copy of the GNU General Public License
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-- along with this program. If not, see <http://www.gnu.org/licenses/>.
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with Crypto_Core_Types; use Crypto_Core_Types;
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package Pi16Cipher_Spec is
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type Context_T is private;
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Cipher_Name : constant String := "pi16cipher";
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Width_Bits : constant := 16;
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N : constant := 4;
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R : constant := 3;
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IS_Bits : constant := (N * 4 * Width_Bits);
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IS_Bytes : constant := IS_Bits / 8;
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Rate_Bits : constant := IS_Bits / 2;
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Rate_Bytes : constant := Rate_Bits / 8;
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Capacity_Bits : constant := IS_Bits - Rate_Bits;
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Capacity_Bytes : constant := Capacity_Bits / 8;
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Block_Bits : constant := Rate_Bits;
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Block_Bytes : constant := Block_Bits / 8;
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Tag_Bits : constant := Rate_Bits;
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Tag_Bytes : constant := Tag_Bits / 8;
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Secret_Message_Number_Bits : constant := Block_Bits;
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Secret_Message_Number_Bytes : constant := Secret_Message_Number_Bits / 8;
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subtype Block_Number_T is Natural;
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subtype Block_T is u8_Array (1 .. Rate_Bytes);
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procedure Initialize(Context : out Context_T; Key : in u8_Array; Public_Nonce : in u8_Array);
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-- procedure Encrypt_Secret_Message_Number(Context : in out Context; Secret_Message_Number : in u8_Array);
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-- procedure Header_Next_Block(Context : in out Context_T; Header : in u8_Array);
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-- procedure Header_Last_Block(Context : in out Context_T; Header : in u8_Array);
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-- procedure Encrypt_Next_Block(Context : in out Context_T; Block : in out u8_Array);
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-- procedure Encrypt_Last_Block(Context : in out Context_T; Block : in out u8_Array);
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-- procedure Decrypt_Next_Block(Context : in out Context_T; Block : in out u8_Array);
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-- procedure Decrypt_Last_Block(Context : in out Context_T; Block : in out u8_Array);
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-- procedure Get_Tag(Context : in Context_T; Tag : out u8_Array);
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-- function Is_Valid(Context : in Context_T; Tag : in u8_Array) return Boolean;
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function Encrypt(Msg : u8_Array; AD : u8_Array; Public_Nonce : u8_Array; Secret_Nonce : Block_T; Key : u8_Array) return u8_Array;
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procedure Decrypt(Is_Valid : out Boolean; Msg : out u8_Array; Secret_Nonce : out Block_T; Cipher : in u8_Array; AD : in u8_Array; Public_Nonce : in u8_Array; Key : in u8_Array);
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private
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subtype Word_T is u16;
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subtype Chunk_T is u16_Array(1 .. 4);
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subtype Tag_Int_T is u16_Array(1 .. 4 * N / 2);
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subtype Tag_T is u8_Array(1 .. Rate_Bytes);
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type State_T is array (1 .. N) of Chunk_T;
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type Context_T is record
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State : State_T;
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Tag : Tag_Int_T;
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Counter : u64;
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end record;
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end Pi16Cipher_Spec;
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