41232818.txt
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上传日期:2013-07-23
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文件大小:14k
- unit des;
- interface
- uses SysUtils;
- type
- TKeyByte = array[0..5] of Byte;
- TDesMode = (dmEncry, dmDecry);
- function DecryptDES(Decryptstr, PublicKey: String): String;
- function EncryptDES(Encyptstr, PrivateKey: String): String;
- function EncryStr(Str, Key: String): String;
- function DecryStr(Str, Key: String): String;
- function EncryStrHex(Str, Key: String): String;
- function DecryStrHex(StrHex, Key: String): String;
- const
- BitIP: array[0..63] of Byte =
- (57, 49, 41, 33, 25, 17, 9, 1,
- 59, 51, 43, 35, 27, 19, 11, 3,
- 61, 53, 45, 37, 29, 21, 13, 5,
- 63, 55, 47, 39, 31, 23, 15, 7,
- 56, 48, 40, 32, 24, 16, 8, 0,
- 58, 50, 42, 34, 26, 18, 10, 2,
- 60, 52, 44, 36, 28, 20, 12, 4,
- 62, 54, 46, 38, 30, 22, 14, 6 );
- BitCP: array[0..63] of Byte =
- ( 39, 7, 47, 15, 55, 23, 63, 31,
- 38, 6, 46, 14, 54, 22, 62, 30,
- 37, 5, 45, 13, 53, 21, 61, 29,
- 36, 4, 44, 12, 52, 20, 60, 28,
- 35, 3, 43, 11, 51, 19, 59, 27,
- 34, 2, 42, 10, 50, 18, 58, 26,
- 33, 1, 41, 9, 49, 17, 57, 25,
- 32, 0, 40, 8, 48, 16, 56, 24 );
- BitExp: array[0..47] of Integer =
- ( 31, 0, 1, 2, 3, 4, 3, 4, 5, 6, 7, 8, 7, 8, 9,10,
- 11,12,11,12,13,14,15,16,15,16,17,18,19,20,19,20,
- 21,22,23,24,23,24,25,26,27,28,27,28,29,30,31,0 );
- BitPM: array[0..31] of Byte =
- ( 15, 6,19,20,28,11,27,16, 0,14,22,25, 4,17,30, 9,
- 1, 7,23,13,31,26, 2, 8,18,12,29, 5,21,10, 3,24 );
- sBox: array[0..7] of array[0..63] of Byte =
- ( ( 14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7,
- 0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8,
- 4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0,
- 15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13 ),
- ( 15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10,
- 3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5,
- 0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15,
- 13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9 ),
- ( 10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8,
- 13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1,
- 13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7,
- 1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12 ),
- ( 7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15,
- 13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9,
- 10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4,
- 3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14 ),
- ( 2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9,
- 14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6,
- 4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14,
- 11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3 ),
- ( 12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11,
- 10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8,
- 9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6,
- 4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13 ),
- ( 4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1,
- 13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6,
- 1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2,
- 6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12 ),
- ( 13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7,
- 1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2,
- 7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8,
- 2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11 ) );
- BitPMC1: array[0..55] of Byte =
- ( 56, 48, 40, 32, 24, 16, 8,
- 0, 57, 49, 41, 33, 25, 17,
- 9, 1, 58, 50, 42, 34, 26,
- 18, 10, 2, 59, 51, 43, 35,
- 62, 54, 46, 38, 30, 22, 14,
- 6, 61, 53, 45, 37, 29, 21,
- 13, 5, 60, 52, 44, 36, 28,
- 20, 12, 4, 27, 19, 11, 3 );
- BitPMC2: array[0..47] of Byte =
- ( 13, 16, 10, 23, 0, 4,
- 2, 27, 14, 5, 20, 9,
- 22, 18, 11, 3, 25, 7,
- 15, 6, 26, 19, 12, 1,
- 40, 51, 30, 36, 46, 54,
- 29, 39, 50, 44, 32, 47,
- 43, 48, 38, 55, 33, 52,
- 45, 41, 49, 35, 28, 31 );
- var
- subKey: array[0..15] of TKeyByte;
- implementation
- function DecryptDES(Decryptstr, PublicKey: String): String;
- begin
- Result :=DecryStr(Decryptstr, PublicKey);
- end;
- function EncryptDES(Encyptstr, PrivateKey: String): String;
- begin
- Result := EncryStr(Encyptstr, PrivateKey);
- end;
- procedure initPermutation(var inData: array of Byte);
- var
- newData: array[0..7] of Byte;
- i: Integer;
- begin
- FillChar(newData, 8, 0);
- for i := 0 to 63 do
- if (inData[BitIP[i] shr 3] and (1 shl (7- (BitIP[i] and $07)))) <> 0 then
- newData[i shr 3] := newData[i shr 3] or (1 shl (7-(i and $07)));
- for i := 0 to 7 do inData[i] := newData[i];
- end;
- procedure conversePermutation(var inData: array of Byte);
- var
- newData: array[0..7] of Byte;
- i: Integer;
- begin
- FillChar(newData, 8, 0);
- for i := 0 to 63 do
- if (inData[BitCP[i] shr 3] and (1 shl (7-(BitCP[i] and $07)))) <> 0 then
- newData[i shr 3] := newData[i shr 3] or (1 shl (7-(i and $07)));
- for i := 0 to 7 do inData[i] := newData[i];
- end;
- procedure expand(inData: array of Byte; var outData: array of Byte);
- var
- i: Integer;
- begin
- FillChar(outData, 6, 0);
- for i := 0 to 47 do
- if (inData[BitExp[i] shr 3] and (1 shl (7-(BitExp[i] and $07)))) <> 0 then
- outData[i shr 3] := outData[i shr 3] or (1 shl (7-(i and $07)));
- end;
- procedure permutation(var inData: array of Byte);
- var
- newData: array[0..3] of Byte;
- i: Integer;
- begin
- FillChar(newData, 4, 0);
- for i := 0 to 31 do
- if (inData[BitPM[i] shr 3] and (1 shl (7-(BitPM[i] and $07)))) <> 0 then
- newData[i shr 3] := newData[i shr 3] or (1 shl (7-(i and $07)));
- for i := 0 to 3 do inData[i] := newData[i];
- end;
- function si(s,inByte: Byte): Byte;
- var
- c: Byte;
- begin
- c := (inByte and $20) or ((inByte and $1e) shr 1) or
- ((inByte and $01) shl 4);
- Result := (sBox[s][c] and $0f);
- end;
- procedure permutationChoose1(inData: array of Byte;
- var outData: array of Byte);
- var
- i: Integer;
- begin
- FillChar(outData, 7, 0);
- for i := 0 to 55 do
- if (inData[BitPMC1[i] shr 3] and (1 shl (7-(BitPMC1[i] and $07)))) <> 0 then
- outData[i shr 3] := outData[i shr 3] or (1 shl (7-(i and $07)));
- end;
- procedure permutationChoose2(inData: array of Byte;
- var outData: array of Byte);
- var
- i: Integer;
- begin
- FillChar(outData, 6, 0);
- for i := 0 to 47 do
- if (inData[BitPMC2[i] shr 3] and (1 shl (7-(BitPMC2[i] and $07)))) <> 0 then
- outData[i shr 3] := outData[i shr 3] or (1 shl (7-(i and $07)));
- end;
-
- procedure cycleMove(var inData: array of Byte; bitMove: Byte);
- var
- i: Integer;
- begin
- for i := 0 to bitMove - 1 do
- begin
- inData[0] := (inData[0] shl 1) or (inData[1] shr 7);
- inData[1] := (inData[1] shl 1) or (inData[2] shr 7);
- inData[2] := (inData[2] shl 1) or (inData[3] shr 7);
- inData[3] := (inData[3] shl 1) or ((inData[0] and $10) shr 4);
- inData[0] := (inData[0] and $0f);
- end;
- end;
- procedure makeKey(inKey: array of Byte; var outKey: array of TKeyByte);
- const
- bitDisplace: array[0..15] of Byte =
- ( 1,1,2,2, 2,2,2,2, 1,2,2,2, 2,2,2,1 );
- var
- outData56: array[0..6] of Byte;
- key28l: array[0..3] of Byte;
- key28r: array[0..3] of Byte;
- key56o: array[0..6] of Byte;
- i: Integer;
- begin
- permutationChoose1(inKey, outData56);
- key28l[0] := outData56[0] shr 4;
- key28l[1] := (outData56[0] shl 4) or (outData56[1] shr 4);
- key28l[2] := (outData56[1] shl 4) or (outData56[2] shr 4);
- key28l[3] := (outData56[2] shl 4) or (outData56[3] shr 4);
- key28r[0] := outData56[3] and $0f;
- key28r[1] := outData56[4];
- key28r[2] := outData56[5];
- key28r[3] := outData56[6];
- for i := 0 to 15 do
- begin
- cycleMove(key28l, bitDisplace[i]);
- cycleMove(key28r, bitDisplace[i]);
- key56o[0] := (key28l[0] shl 4) or (key28l[1] shr 4);
- key56o[1] := (key28l[1] shl 4) or (key28l[2] shr 4);
- key56o[2] := (key28l[2] shl 4) or (key28l[3] shr 4);
- key56o[3] := (key28l[3] shl 4) or (key28r[0]);
- key56o[4] := key28r[1];
- key56o[5] := key28r[2];
- key56o[6] := key28r[3];
- permutationChoose2(key56o, outKey[i]);
- end;
- end;
- procedure encry(inData, subKey: array of Byte;
- var outData: array of Byte);
- var
- outBuf: array[0..5] of Byte;
- buf: array[0..7] of Byte;
- i: Integer;
- begin
- expand(inData, outBuf);
- for i := 0 to 5 do outBuf[i] := outBuf[i] xor subKey[i];
- // outBuf xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx
- buf[0] := outBuf[0] shr 2; //xxxxxx -> 2
- buf[1] := ((outBuf[0] and $03) shl 4) or (outBuf[1] shr 4); // 4 <- xx xxxx -> 4
- buf[2] := ((outBuf[1] and $0f) shl 2) or (outBuf[2] shr 6); // 2 <- xxxx xx -> 6
- buf[3] := outBuf[2] and $3f; // xxxxxx
- buf[4] := outBuf[3] shr 2; // xxxxxx
- buf[5] := ((outBuf[3] and $03) shl 4) or (outBuf[4] shr 4); // xx xxxx
- buf[6] := ((outBuf[4] and $0f) shl 2) or (outBuf[5] shr 6); // xxxx xx
- buf[7] := outBuf[5] and $3f; // xxxxxx
- for i := 0 to 7 do buf[i] := si(i, buf[i]);
- for i := 0 to 3 do outBuf[i] := (buf[i*2] shl 4) or buf[i*2+1];
- permutation(outBuf);
- for i := 0 to 3 do outData[i] := outBuf[i];
- end;
- procedure desData(desMode: TDesMode;
- inData: array of Byte; var outData: array of Byte);
- // inData, outData 都为8Bytes,否则出错
- var
- i, j: Integer;
- temp, buf: array[0..3] of Byte;
- begin
- for i := 0 to 7 do outData[i] := inData[i];
- initPermutation(outData);
- if desMode = dmEncry then
- begin
- for i := 0 to 15 do
- begin
- for j := 0 to 3 do temp[j] := outData[j]; //temp = Ln
- for j := 0 to 3 do outData[j] := outData[j + 4]; //Ln+1 = Rn
- encry(outData, subKey[i], buf); //Rn ==Kn==> buf
- for j := 0 to 3 do outData[j + 4] := temp[j] xor buf[j]; //Rn+1 = Ln^buf
- end;
- for j := 0 to 3 do temp[j] := outData[j + 4];
- for j := 0 to 3 do outData[j + 4] := outData[j];
- for j := 0 to 3 do outData[j] := temp[j];
- end
- else if desMode = dmDecry then
- begin
- for i := 15 downto 0 do
- begin
- for j := 0 to 3 do temp[j] := outData[j];
- for j := 0 to 3 do outData[j] := outData[j + 4];
- encry(outData, subKey[i], buf);
- for j := 0 to 3 do outData[j + 4] := temp[j] xor buf[j];
- end;
- for j := 0 to 3 do temp[j] := outData[j + 4];
- for j := 0 to 3 do outData[j + 4] := outData[j];
- for j := 0 to 3 do outData[j] := temp[j];
- end;
- conversePermutation(outData);
- end;
- //////////////////////////////////////////////////////////////
- function EncryStr(Str, Key: String): String;
- var
- StrByte, OutByte, KeyByte: array[0..7] of Byte;
- StrResult: String;
- I, J: Integer;
- begin
- if (Length(Str) > 0) and (Ord(Str[Length(Str)]) = 0) then
- raise Exception.Create('Error: the last char is NULL char.');
- if Length(Key) < 8 then
- while Length(Key) < 8 do Key := Key + Chr(0);
- while Length(Str) mod 8 <> 0 do Str := Str + Chr(0);
- for J := 0 to 7 do KeyByte[J] := Ord(Key[J + 1]);
- makeKey(keyByte, subKey);
- StrResult := '';
- for I := 0 to Length(Str) div 8 - 1 do
- begin
- for J := 0 to 7 do
- StrByte[J] := Ord(Str[I * 8 + J + 1]);
- desData(dmEncry, StrByte, OutByte);
- for J := 0 to 7 do
- StrResult := StrResult + Chr(OutByte[J]);
- end;
- Result := StrResult;
- end;
- function DecryStr(Str, Key: String): String;
- var
- StrByte, OutByte, KeyByte: array[0..7] of Byte;
- StrResult: String;
- I, J: Integer;
- begin
- if Length(Key) < 8 then
- while Length(Key) < 8 do Key := Key + Chr(0);
- for J := 0 to 7 do KeyByte[J] := Ord(Key[J + 1]);
- makeKey(keyByte, subKey);
- StrResult := '';
- for I := 0 to Length(Str) div 8 - 1 do
- begin
- for J := 0 to 7 do StrByte[J] := Ord(Str[I * 8 + J + 1]);
- desData(dmDecry, StrByte, OutByte);
- for J := 0 to 7 do
- StrResult := StrResult + Chr(OutByte[J]);
- end;
- while (Length(StrResult) > 0) and
- (Ord(StrResult[Length(StrResult)]) = 0) do
- Delete(StrResult, Length(StrResult), 1);
- Result := StrResult;
- end;
- ///////////////////////////////////////////////////////////
- function EncryStrHex(Str, Key: String): String;
- var
- StrResult, TempResult, Temp: String;
- I: Integer;
- begin
- TempResult := EncryStr(Str, Key);
- StrResult := '';
- for I := 0 to Length(TempResult) - 1 do
- begin
- Temp := Format('%x', [Ord(TempResult[I + 1])]);
- if Length(Temp) = 1 then Temp := '0' + Temp;
- StrResult := StrResult + Temp;
- end;
- Result := StrResult;
- end;
- function DecryStrHex(StrHex, Key: String): String;
- function HexToInt(Hex: String): Integer;
- var
- I, Res: Integer;
- ch: Char;
- begin
- Res := 0;
- for I := 0 to Length(Hex) - 1 do
- begin
- ch := Hex[I + 1];
- if (ch >= '0') and (ch <= '9') then
- Res := Res * 16 + Ord(ch) - Ord('0')
- else if (ch >= 'A') and (ch <= 'F') then
- Res := Res * 16 + Ord(ch) - Ord('A') + 10
- else if (ch >= 'a') and (ch <= 'f') then
- Res := Res * 16 + Ord(ch) - Ord('a') + 10
- else raise Exception.Create('Error: not a Hex String');
- end;
- Result := Res;
- end;
- var
- Str, Temp: String;
- I: Integer;
- begin
- Str := '';
- for I := 0 to Length(StrHex) div 2 - 1 do
- begin
- Temp := Copy(StrHex, I * 2 + 1, 2);
- Str := Str + Chr(HexToInt(Temp));
- end;
- Result := DecryStr(Str, Key);
- end;
- end.