116 lines
3.3 KiB
Ada
116 lines
3.3 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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package body Crypto_Core_Types is
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function To_Hex(A : u8) return String is
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S : String(1 .. 2);
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Hex_Table : constant array (0 .. 15) of Character :=
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( '0', '1', '2', '3',
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'4', '5', '6', '7',
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'8', '9', 'a', 'b',
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'c', 'd', 'e', 'f');
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begin
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S(1) := Hex_Table(Integer(Shift_Right(A, 4)));
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S(2) := Hex_Table(Integer(A and 16#0f#));
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return S;
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end To_Hex;
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function To_Hex(A : u8_Array) return String is
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S : String(1 .. A'Length * 2);
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k : Positive := 1;
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begin
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for i in A'Range loop
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S(k .. k + 1) := To_Hex(A(i));
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k := k + 2;
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end loop;
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return S;
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end To_Hex;
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function Get_Hex_Value(C : Character) return Integer is
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r : Integer;
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begin
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case C is
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when '0' => r := 0;
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when '1' => r := 1;
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when '2' => r := 2;
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when '3' => r := 3;
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when '4' => r := 4;
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when '5' => r := 5;
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when '6' => r := 6;
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when '7' => r := 7;
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when '8' => r := 8;
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when '9' => r := 9;
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when 'A' => r := 10;
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when 'a' => r := 10;
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when 'B' => r := 11;
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when 'b' => r := 11;
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when 'C' => r := 12;
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when 'c' => r := 12;
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when 'D' => r := 13;
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when 'd' => r := 13;
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when 'E' => r := 14;
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when 'e' => r := 14;
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when 'F' => r := 15;
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when 'f' => r := 15;
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when others => r:= -1;
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end case;
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return r;
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end;
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function From_Hex(S : String) return u8_Array is
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A : u8_Array(1 .. (S'Length + 1) / 2);
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C : Character;
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V : Integer range -1 .. 15;
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Index : Positive := 1;
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Inside : Boolean := False;
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begin
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for i in S'Range loop
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C := S(i);
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if C /= ' ' and then C /= '_' then
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V := Get_Hex_Value(C);
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if V = -1 then
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raise Format_Violation;
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else
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if Inside then
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A(Index) := A(Index) or u8(V);
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Inside := False;
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Index := Index + 1;
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else
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A(Index) := Shift_Left(u8(V), 4);
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Inside := True;
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end if;
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end if;
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end if;
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end loop;
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return A;
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end From_Hex;
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function From_Ascii(S : String) return u8_Array is
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A : u8_Array(1 .. S'Length);
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Index : Integer := 1;
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begin
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for i in S'Range loop
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A(Index) := u8(Character'Pos(S(i)));
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Index := INdex + 1;
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end loop;
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return A;
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end From_Ascii;
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end Crypto_Core_types;
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