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UNIT CsCrc;
interface
//
// Initial Value for CRCvalue is $FFFFFFF (by definition)
// The CRC-Value is equal to NOT CRCvalue
//
  Procedure InitCrc32 (Var CRCvalue          :  Cardinal);
  Procedure NextCrc32      (B         : Byte;
           Var CRCvalue          :  Cardinal);
  Procedure DoneCrc32 (Var CRCvalue          :  Cardinal);

  Procedure InitCrc16 (Var CRCvalue          :  Word);
  Procedure NextCrc16      (B         : Byte;
           Var CRCvalue          :  Word);
  Procedure DoneCrc16 (Var CRCvalue          :  Word);

  Function CRC32FromString (Const aString : String) : Cardinal;
  Function CRC16FromString (Const aString : String) : Word;
Implementation
Const
  Table32:  Array[Byte] Of Cardinal =
   ($00000000, $77073096, $EE0E612C, $990951BA,
    $076DC419, $706AF48F, $E963A535, $9E6495A3,
    $0EDB8832, $79DCB8A4, $E0D5E91E, $97D2D988,
    $09B64C2B, $7EB17CBD, $E7B82D07, $90BF1D91,
    $1DB71064, $6AB020F2, $F3B97148, $84BE41DE,
    $1ADAD47D, $6DDDE4EB, $F4D4B551, $83D385C7,
    $136C9856, $646BA8C0, $FD62F97A, $8A65C9EC,
    $14015C4F, $63066CD9, $FA0F3D63, $8D080DF5,
    $3B6E20C8, $4C69105E, $D56041E4, $A2677172,
    $3C03E4D1, $4B04D447, $D20D85FD, $A50AB56B,
    $35B5A8FA, $42B2986C, $DBBBC9D6, $ACBCF940,
    $32D86CE3, $45DF5C75, $DCD60DCF, $ABD13D59,
    $26D930AC, $51DE003A, $C8D75180, $BFD06116,
    $21B4F4B5, $56B3C423, $CFBA9599, $B8BDA50F,
    $2802B89E, $5F058808, $C60CD9B2, $B10BE924,
    $2F6F7C87, $58684C11, $C1611DAB, $B6662D3D,

    $76DC4190, $01DB7106, $98D220BC, $EFD5102A,
    $71B18589, $06B6B51F, $9FBFE4A5, $E8B8D433,
    $7807C9A2, $0F00F934, $9609A88E, $E10E9818,
    $7F6A0DBB, $086D3D2D, $91646C97, $E6635C01,
    $6B6B51F4, $1C6C6162, $856530D8, $F262004E,
    $6C0695ED, $1B01A57B, $8208F4C1, $F50FC457,
    $65B0D9C6, $12B7E950, $8BBEB8EA, $FCB9887C,
    $62DD1DDF, $15DA2D49, $8CD37CF3, $FBD44C65,
    $4DB26158, $3AB551CE, $A3BC0074, $D4BB30E2,
    $4ADFA541, $3DD895D7, $A4D1C46D, $D3D6F4FB,
    $4369E96A, $346ED9FC, $AD678846, $DA60B8D0,
    $44042D73, $33031DE5, $AA0A4C5F, $DD0D7CC9,
    $5005713C, $270241AA, $BE0B1010, $C90C2086,
    $5768B525, $206F85B3, $B966D409, $CE61E49F,
    $5EDEF90E, $29D9C998, $B0D09822, $C7D7A8B4,
    $59B33D17, $2EB40D81, $B7BD5C3B, $C0BA6CAD,

    $EDB88320, $9ABFB3B6, $03B6E20C, $74B1D29A,
    $EAD54739, $9DD277AF, $04DB2615, $73DC1683,
    $E3630B12, $94643B84, $0D6D6A3E, $7A6A5AA8,
    $E40ECF0B, $9309FF9D, $0A00AE27, $7D079EB1,
    $F00F9344, $8708A3D2, $1E01F268, $6906C2FE,
    $F762575D, $806567CB, $196C3671, $6E6B06E7,
    $FED41B76, $89D32BE0, $10DA7A5A, $67DD4ACC,
    $F9B9DF6F, $8EBEEFF9, $17B7BE43, $60B08ED5,
    $D6D6A3E8, $A1D1937E, $38D8C2C4, $4FDFF252,
    $D1BB67F1, $A6BC5767, $3FB506DD, $48B2364B,
    $D80D2BDA, $AF0A1B4C, $36034AF6, $41047A60,
    $DF60EFC3, $A867DF55, $316E8EEF, $4669BE79,
    $CB61B38C, $BC66831A, $256FD2A0, $5268E236,
    $CC0C7795, $BB0B4703, $220216B9, $5505262F,
    $C5BA3BBE, $B2BD0B28, $2BB45A92, $5CB36A04,
    $C2D7FFA7, $B5D0CF31, $2CD99E8B, $5BDEAE1D,

    $9B64C2B0, $EC63F226, $756AA39C, $026D930A,
    $9C0906A9, $EB0E363F, $72076785, $05005713,
    $95BF4A82, $E2B87A14, $7BB12BAE, $0CB61B38,
    $92D28E9B, $E5D5BE0D, $7CDCEFB7, $0BDBDF21,
    $86D3D2D4, $F1D4E242, $68DDB3F8, $1FDA836E,
    $81BE16CD, $F6B9265B, $6FB077E1, $18B74777,
    $88085AE6, $FF0F6A70, $66063BCA, $11010B5C,
    $8F659EFF, $F862AE69, $616BFFD3, $166CCF45,
    $A00AE278, $D70DD2EE, $4E048354, $3903B3C2,
    $A7672661, $D06016F7, $4969474D, $3E6E77DB,
    $AED16A4A, $D9D65ADC, $40DF0B66, $37D83BF0,
    $A9BCAE53, $DEBB9EC5, $47B2CF7F, $30B5FFE9,
    $BDBDF21C, $CABAC28A, $53B39330, $24B4A3A6,
    $BAD03605, $CDD70693, $54DE5729, $23D967BF,
    $B3667A2E, $C4614AB8, $5D681B02, $2A6F2B94,
    $B40BBE37, $C30C8EA1, $5A05DF1B, $2D02EF8D);



  Table16 : Array [Byte] Of Word = (
    $0000,$C0C1,$C181,$0140,$C301,$03C0,$0280,$C241,
    $C601,$06C0,$0780,$C741,$0500,$C5C1,$C481,$0440,
    $CC01,$0CC0,$0D80,$CD41,$0F00,$CFC1,$CE81,$0E40,
    $0A00,$CAC1,$CB81,$0B40,$C901,$09C0,$0880,$C841,
    $D801,$18C0,$1980,$D941,$1B00,$DBC1,$DA81,$1A40,
    $1E00,$DEC1,$DF81,$1F40,$DD01,$1DC0,$1C80,$DC41,
    $1400,$D4C1,$D581,$1540,$D701,$17C0,$1680,$D641,
    $D201,$12C0,$1380,$D341,$1100,$D1C1,$D081,$1040,
    $F001,$30C0,$3180,$F141,$3300,$F3C1,$F281,$3240,
    $3600,$F6C1,$F781,$3740,$F501,$35C0,$3480,$F441,
    $3C00,$FCC1,$FD81,$3D40,$FF01,$3FC0,$3E80,$FE41,
    $FA01,$3AC0,$3B80,$FB41,$3900,$F9C1,$F881,$3840,
    $2800,$E8C1,$E981,$2940,$EB01,$2BC0,$2A80,$EA41,
    $EE01,$2EC0,$2F80,$EF41,$2D00,$EDC1,$EC81,$2C40,
    $E401,$24C0,$2580,$E541,$2700,$E7C1,$E681,$2640,
    $2200,$E2C1,$E381,$2340,$E101,$21C0,$2080,$E041,
    $A001,$60C0,$6180,$A141,$6300,$A3C1,$A281,$6240,
    $6600,$A6C1,$A781,$6740,$A501,$65C0,$6480,$A441,
    $6C00,$ACC1,$AD81,$6D40,$AF01,$6FC0,$6E80,$AE41,
    $AA01,$6AC0,$6B80,$AB41,$6900,$A9C1,$A881,$6840,
    $7800,$B8C1,$B981,$7940,$BB01,$7BC0,$7A80,$BA41,
    $BE01,$7EC0,$7F80,$BF41,$7D00,$BDC1,$BC81,$7C40,
    $B401,$74C0,$7580,$B541,$7700,$B7C1,$B681,$7640,
    $7200,$B2C1,$B381,$7340,$B101,$71C0,$7080,$B041,
    $5000,$90C1,$9181,$5140,$9301,$53C0,$5280,$9241,
    $9601,$56C0,$5780,$9741,$5500,$95C1,$9481,$5440,
    $9C01,$5CC0,$5D80,$9D41,$5F00,$9FC1,$9E81,$5E40,
    $5A00,$9AC1,$9B81,$5B40,$9901,$59C0,$5880,$9841,
    $8801,$48C0,$4980,$8941,$4B00,$8BC1,$8A81,$4A40,
    $4E00,$8EC1,$8F81,$4F40,$8D01,$4DC0,$4C80,$8C41,
    $4400,$84C1,$8581,$4540,$8701,$47C0,$4680,$8641,
    $8201,$42C0,$4380,$8341,$4100,$81C1,$8081,$4040);

Procedure InitCrc32;
Begin
  CRCValue := $FFFFFFFF;
End;

Procedure NextCrc32;
Begin
  CRCvalue := (CRCvalue SHR 8)  XOR Table32[b XOR (CRCvalue AND $000000FF)];
End;

Procedure DoneCrc32;
Begin
  CRCvalue := NOT CRCvalue;
End;

Procedure InitCrc16;
Begin
  CRCValue := $FFFF;
End;

Procedure NextCrc16;
Begin
  CRCvalue := (CRCvalue SHR 8)  XOR Table16[b XOR (CRCvalue AND $00FF)];
End;

Procedure DoneCrc16;
Begin
  CRCvalue := NOT CRCvalue;
End;

Function CRC32FromString (Const aString : String) : Cardinal;
Var
  i : Integer;

Begin
  InitCrc32(Result);
  For i:=1 to Length (aString) do
    NextCrc32 (Ord (aString[i]), Result);
  DoneCrc32(Result)
End;

Function CRC16FromString (Const aString : String) : Word;
Var
  i : Integer;

Begin
  InitCrc16(Result);
  For i:=1 to Length (aString) do
    NextCrc16 (Ord (aString[i]), Result);
  DoneCrc16(Result)
End;
End.					

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var  CRC         : Word;
     Sendestring : String;

begin
  SendeString:=#0#0#0#0#3;
  //CRC Berechnen
  CRC:=CRC16FromString(SendeString);
  SendeString:=SendeString+(inttostr(CRC));
end;					

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SetLength (aString, Length (aString) + 2);
Move (CRC, aString[Length (aString)-1],2);