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CRC5_USB.pas
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CRC5_USB.pas
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unit CRC5_USB;
//CRC-5 USB
//Author: domasz
//Last Update: 2022-11-21
//Licence: MIT
interface
uses SysUtils, HasherBase;
type THasherCRC5_USB = class(THasherbase)
private
FHash: Byte;
public
constructor Create; override;
procedure Update(Msg: PByte; Length: Integer); override;
function Final: String; override;
end;
implementation
var Table: array[0..255] of Byte = (
$01, $0F, $1D, $13, $10, $1E, $0C, $02,
$0A, $04, $16, $18, $1B, $15, $07, $09,
$17, $19, $0B, $05, $06, $08, $1A, $14,
$1C, $12, $00, $0E, $0D, $03, $11, $1F,
$04, $0A, $18, $16, $15, $1B, $09, $07,
$0F, $01, $13, $1D, $1E, $10, $02, $0C,
$12, $1C, $0E, $00, $03, $0D, $1F, $11,
$19, $17, $05, $0B, $08, $06, $14, $1A,
$0B, $05, $17, $19, $1A, $14, $06, $08,
$00, $0E, $1C, $12, $11, $1F, $0D, $03,
$1D, $13, $01, $0F, $0C, $02, $10, $1E,
$16, $18, $0A, $04, $07, $09, $1B, $15,
$0E, $00, $12, $1C, $1F, $11, $03, $0D,
$05, $0B, $19, $17, $14, $1A, $08, $06,
$18, $16, $04, $0A, $09, $07, $15, $1B,
$13, $1D, $0F, $01, $02, $0C, $1E, $10,
$15, $1B, $09, $07, $04, $0A, $18, $16,
$1E, $10, $02, $0C, $0F, $01, $13, $1D,
$03, $0D, $1F, $11, $12, $1C, $0E, $00,
$08, $06, $14, $1A, $19, $17, $05, $0B,
$10, $1E, $0C, $02, $01, $0F, $1D, $13,
$1B, $15, $07, $09, $0A, $04, $16, $18,
$06, $08, $1A, $14, $17, $19, $0B, $05,
$0D, $03, $11, $1F, $1C, $12, $00, $0E,
$1F, $11, $03, $0D, $0E, $00, $12, $1C,
$14, $1A, $08, $06, $05, $0B, $19, $17,
$09, $07, $15, $1B, $18, $16, $04, $0A,
$02, $0C, $1E, $10, $13, $1D, $0F, $01,
$1A, $14, $06, $08, $0B, $05, $17, $19,
$11, $1F, $0D, $03, $00, $0E, $1C, $12,
$0C, $02, $10, $1E, $1D, $13, $01, $0F,
$07, $09, $1B, $15, $16, $18, $0A, $04
);
constructor THasherCRC5_USB.Create;
begin
inherited Create;
FHash := $00;
Check := '19';
end;
procedure THasherCRC5_USB.Update(Msg: PByte; Length: Integer);
var i: Integer;
begin
for i:=0 to Length-1 do begin
FHash := Table[($FF and (FHash xor Msg^))];
Inc(Msg);
end;
end;
function THasherCRC5_USB.Final: String;
begin
Result := IntToHex(FHash, 2);
end;
initialization
HasherList.RegisterHasher('CRC-5 USB', THasherCRC5_USB);
end.