CRC8_I4321.pas

unit CRC8_I4321;
//CRC-8 I-432-1
//Author: domasz
//Version: 0.1 (2022-11-17)
//Licence: MIT  

interface

uses SysUtils, HasherBase;

type THasherCRC8_I4321 = 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 = (
$00, $07, $0E, $09, $1C, $1B, $12, $15,
$38, $3F, $36, $31, $24, $23, $2A, $2D,
$70, $77, $7E, $79, $6C, $6B, $62, $65,
$48, $4F, $46, $41, $54, $53, $5A, $5D,
$E0, $E7, $EE, $E9, $FC, $FB, $F2, $F5,
$D8, $DF, $D6, $D1, $C4, $C3, $CA, $CD,
$90, $97, $9E, $99, $8C, $8B, $82, $85,
$A8, $AF, $A6, $A1, $B4, $B3, $BA, $BD,
$C7, $C0, $C9, $CE, $DB, $DC, $D5, $D2,
$FF, $F8, $F1, $F6, $E3, $E4, $ED, $EA,
$B7, $B0, $B9, $BE, $AB, $AC, $A5, $A2,
$8F, $88, $81, $86, $93, $94, $9D, $9A,
$27, $20, $29, $2E, $3B, $3C, $35, $32,
$1F, $18, $11, $16, $03, $04, $0D, $0A,
$57, $50, $59, $5E, $4B, $4C, $45, $42,
$6F, $68, $61, $66, $73, $74, $7D, $7A,
$89, $8E, $87, $80, $95, $92, $9B, $9C,
$B1, $B6, $BF, $B8, $AD, $AA, $A3, $A4,
$F9, $FE, $F7, $F0, $E5, $E2, $EB, $EC,
$C1, $C6, $CF, $C8, $DD, $DA, $D3, $D4,
$69, $6E, $67, $60, $75, $72, $7B, $7C,
$51, $56, $5F, $58, $4D, $4A, $43, $44,
$19, $1E, $17, $10, $05, $02, $0B, $0C,
$21, $26, $2F, $28, $3D, $3A, $33, $34,
$4E, $49, $40, $47, $52, $55, $5C, $5B,
$76, $71, $78, $7F, $6A, $6D, $64, $63,
$3E, $39, $30, $37, $22, $25, $2C, $2B,
$06, $01, $08, $0F, $1A, $1D, $14, $13,
$AE, $A9, $A0, $A7, $B2, $B5, $BC, $BB,
$96, $91, $98, $9F, $8A, $8D, $84, $83,
$DE, $D9, $D0, $D7, $C2, $C5, $CC, $CB,
$E6, $E1, $E8, $EF, $FA, $FD, $F4, $F3
);

constructor THasherCRC8_I4321.Create;
begin
  inherited Create;
  FHash :=  $00;
  Check := 'A1';
end;

procedure THasherCRC8_I4321.Update(Msg: PByte; Length: Integer);
var i: Integer;
begin
  for i:=0 to Length-1 do begin    	
    FHash := (FHash shl 8) xor Table[(Msg^ xor FHash) and $FF];	
    Inc(Msg);
  end;   
end;

function THasherCRC8_I4321.Final: String;
begin
  FHash := FHash xor $55;
  Result := IntToHex(FHash, 2); 
end;

initialization
  HasherList.RegisterHasher('CRC-8 I-432-1', THasherCRC8_I4321);

end.