71 lines
2.4 KiB
Ada
71 lines
2.4 KiB
Ada
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-- 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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with Crypto_Types; use Crypto_Types;
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use Crypto_Types.Crypto_Utils_u8;
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package AES_Spec is
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subtype Key_128_T is Block_128_Bit;
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subtype Key_192_T is Block_192_Bit;
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subtype Key_256_T is Block_256_Bit;
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type Context_128_T is private;
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type Context_192_T is private;
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type Context_256_T is private;
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subtype Block_T is Block_128_Bit;
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procedure Initialize(Context : out Context_128_T; Key : in Key_128_T);
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procedure Encrypt(Context : in Context_128_T; Block: in out Block_T);
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procedure Decrypt(Context : in Context_128_T; Block: in out Block_T);
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procedure Initialize(Context : out Context_192_T; Key : in Key_192_T);
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procedure Encrypt(Context : in Context_192_T; Block: in out Block_T);
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procedure Decrypt(Context : in Context_192_T; Block: in out Block_T);
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procedure Initialize(Context : out Context_256_T; Key : in Key_256_T);
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procedure Encrypt(Context : in Context_256_T; Block: in out Block_T);
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procedure Decrypt(Context : in Context_256_T; Block: in out Block_T);
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private
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subtype RoundKey_T is Block_128_Bit;
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type RoundKeys_T is Array (Integer range <>) of RoundKey_T;
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subtype Num_RoundKeys_T is Integer range 11 .. 15;
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type Context_T(Num_RoundKeys : Num_RoundKeys_T := 15) is record
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RoundKeys : RoundKeys_T(1 .. Num_RoundKeys);
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end record;
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type Context_128_T is new Context_T(11);
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type Context_192_T is new Context_T(13);
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type Context_256_T is new Context_T(15);
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Nb : constant Integer := 4;
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polynom : constant u8 := 16#1B#;
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function gf256mul(a, b : u8) return u8;
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generic
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type T_In(<>) is new u8_Array;
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type T_Out(<>) is new Context_T;
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procedure Initialize_Generic(Key : T_In; Context : out T_Out);
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end AES_Spec;
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