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Pascal/Delphi Source File
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2002-07-08
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17KB
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485 lines
{******************************************************************************}
{* DCPcrypt v2.0 written by David Barton (crypto@cityinthesky.co.uk) **********}
{******************************************************************************}
{* A binary compatible implementation of DES and Triple DES *******************}
{* Based on C source code by Eric Young ***************************************}
{******************************************************************************}
{* Copyright (c) 1999-2002 David Barton *}
{* Permission is hereby granted, free of charge, to any person obtaining a *}
{* copy of this software and associated documentation files (the "Software"), *}
{* to deal in the Software without restriction, including without limitation *}
{* the rights to use, copy, modify, merge, publish, distribute, sublicense, *}
{* and/or sell copies of the Software, and to permit persons to whom the *}
{* Software is furnished to do so, subject to the following conditions: *}
{* *}
{* The above copyright notice and this permission notice shall be included in *}
{* all copies or substantial portions of the Software. *}
{* *}
{* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR *}
{* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *}
{* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL *}
{* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER *}
{* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING *}
{* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER *}
{* DEALINGS IN THE SOFTWARE. *}
{******************************************************************************}
{******************************************************************************}
{* This implementation of DES is based on the C implementation by *}
{* Eric Young (eay@mincom.oz.au) *}
{******************************************************************************}
{* DES takes a 64bit key and discards every 8th bit (56bit effectively) *}
{* 3DES takes either a <= 128bit key and uses one key twice or takes a *}
{* <= 192bit key and uses each once (again discarding every 8th bit) *}
{******************************************************************************}
unit DCPdes;
interface
uses
Classes, Sysutils, DCPcrypt2, DCPconst, DCPblockciphers;
type
TDCP_customdes= class(TDCP_blockcipher64)
protected
procedure DoInit(KeyB: PByteArray; KeyData: PDWordArray);
procedure EncryptBlock(const InData; var OutData; KeyData: PDWordArray);
procedure DecryptBlock(const InData; var OutData; KeyData: PDWordArray);
end;
type
TDCP_des= class(TDCP_customdes)
protected
KeyData: array[0..31] of dword;
procedure InitKey(const Key; Size: longword); override;
public
class function GetId: integer; override;
class function GetAlgorithm: string; override;
class function GetMaxKeySize: integer; override;
class function SelfTest: boolean; override;
procedure Burn; override;
procedure EncryptECB(const InData; var OutData); override;
procedure DecryptECB(const InData; var OutData); override;
end;
TDCP_3des= class(TDCP_customdes)
protected
KeyData: array[0..2,0..31] of dword;
procedure InitKey(const Key; Size: longword); override;
public
class function GetId: integer; override;
class function GetAlgorithm: string; override;
class function GetMaxKeySize: integer; override;
class function SelfTest: boolean; override;
procedure Burn; override;
procedure EncryptECB(const InData; var OutData); override;
procedure DecryptECB(const InData; var OutData); override;
end;
{******************************************************************************}
{******************************************************************************}
implementation
{$R-}{$Q-}
{$I DCPdes.inc}
procedure hperm_op(var a, t: dword; n, m: dword);
begin
t:= ((a shl (16 - n)) xor a) and m;
a:= a xor t xor (t shr (16 - n));
end;
procedure perm_op(var a, b, t: dword; n, m: dword);
begin
t:= ((a shr n) xor b) and m;
b:= b xor t;
a:= a xor (t shl n);
end;
procedure TDCP_customdes.DoInit(KeyB: PByteArray; KeyData: PDwordArray);
var
c, d, t, s, t2, i: dword;
begin
c:= KeyB^[0] or (KeyB^[1] shl 8) or (KeyB^[2] shl 16) or (KeyB^[3] shl 24);
d:= KeyB^[4] or (KeyB^[5] shl 8) or (KeyB^[6] shl 16) or (KeyB^[7] shl 24);
perm_op(d,c,t,4,$0f0f0f0f);
hperm_op(c,t,dword(-2),$cccc0000);
hperm_op(d,t,dword(-2),$cccc0000);
perm_op(d,c,t,1,$55555555);
perm_op(c,d,t,8,$00ff00ff);
perm_op(d,c,t,1,$55555555);
d:= ((d and $ff) shl 16) or (d and $ff00) or ((d and $ff0000) shr 16) or
((c and $f0000000) shr 4);
c:= c and $fffffff;
for i:= 0 to 15 do
begin
if shifts2[i]<> 0 then
begin
c:= ((c shr 2) or (c shl 26));
d:= ((d shr 2) or (d shl 26));
end
else
begin
c:= ((c shr 1) or (c shl 27));
d:= ((d shr 1) or (d shl 27));
end;
c:= c and $fffffff;
d:= d and $fffffff;
s:= des_skb[0,c and $3f] or
des_skb[1,((c shr 6) and $03) or ((c shr 7) and $3c)] or
des_skb[2,((c shr 13) and $0f) or ((c shr 14) and $30)] or
des_skb[3,((c shr 20) and $01) or ((c shr 21) and $06) or ((c shr 22) and $38)];
t:= des_skb[4,d and $3f] or
des_skb[5,((d shr 7) and $03) or ((d shr 8) and $3c)] or
des_skb[6, (d shr 15) and $3f ] or
des_skb[7,((d shr 21) and $0f) or ((d shr 22) and $30)];
t2:= ((t shl 16) or (s and $ffff));
KeyData^[(i shl 1)]:= ((t2 shl 2) or (t2 shr 30));
t2:= ((s shr 16) or (t and $ffff0000));
KeyData^[(i shl 1)+1]:= ((t2 shl 6) or (t2 shr 26));
end;
end;
procedure TDCP_customdes.EncryptBlock(const InData; var OutData; KeyData: PDWordArray);
var
l, r, t, u: dword;
i: longint;
begin
r:= PDword(@InData)^;
l:= PDword(dword(@InData)+4)^;
t:= ((l shr 4) xor r) and $0f0f0f0f;
r:= r xor t;
l:= l xor (t shl 4);
t:= ((r shr 16) xor l) and $0000ffff;
l:= l xor t;
r:= r xor (t shl 16);
t:= ((l shr 2) xor r) and $33333333;
r:= r xor t;
l:= l xor (t shl 2);
t:= ((r shr 8) xor l) and $00ff00ff;
l:= l xor t;
r:= r xor (t shl 8);
t:= ((l shr 1) xor r) and $55555555;
r:= r xor t;
l:= l xor (t shl 1);
r:= (r shr 29) or (r shl 3);
l:= (l shr 29) or (l shl 3);
i:= 0;
while i< 32 do
begin
u:= r xor KeyData^[i ];
t:= r xor KeyData^[i+1];
t:= (t shr 4) or (t shl 28);
l:= l xor des_SPtrans[0,(u shr 2) and $3f] xor
des_SPtrans[2,(u shr 10) and $3f] xor
des_SPtrans[4,(u shr 18) and $3f] xor
des_SPtrans[6,(u shr 26) and $3f] xor
des_SPtrans[1,(t shr 2) and $3f] xor
des_SPtrans[3,(t shr 10) and $3f] xor
des_SPtrans[5,(t shr 18) and $3f] xor
des_SPtrans[7,(t shr 26) and $3f];
u:= l xor KeyData^[i+2];
t:= l xor KeyData^[i+3];
t:= (t shr 4) or (t shl 28);
r:= r xor des_SPtrans[0,(u shr 2) and $3f] xor
des_SPtrans[2,(u shr 10) and $3f] xor
des_SPtrans[4,(u shr 18) and $3f] xor
des_SPtrans[6,(u shr 26) and $3f] xor
des_SPtrans[1,(t shr 2) and $3f] xor
des_SPtrans[3,(t shr 10) and $3f] xor
des_SPtrans[5,(t shr 18) and $3f] xor
des_SPtrans[7,(t shr 26) and $3f];
u:= r xor KeyData^[i+4];
t:= r xor KeyData^[i+5];
t:= (t shr 4) or (t shl 28);
l:= l xor des_SPtrans[0,(u shr 2) and $3f] xor
des_SPtrans[2,(u shr 10) and $3f] xor
des_SPtrans[4,(u shr 18) and $3f] xor
des_SPtrans[6,(u shr 26) and $3f] xor
des_SPtrans[1,(t shr 2) and $3f] xor
des_SPtrans[3,(t shr 10) and $3f] xor
des_SPtrans[5,(t shr 18) and $3f] xor
des_SPtrans[7,(t shr 26) and $3f];
u:= l xor KeyData^[i+6];
t:= l xor KeyData^[i+7];
t:= (t shr 4) or (t shl 28);
r:= r xor des_SPtrans[0,(u shr 2) and $3f] xor
des_SPtrans[2,(u shr 10) and $3f] xor
des_SPtrans[4,(u shr 18) and $3f] xor
des_SPtrans[6,(u shr 26) and $3f] xor
des_SPtrans[1,(t shr 2) and $3f] xor
des_SPtrans[3,(t shr 10) and $3f] xor
des_SPtrans[5,(t shr 18) and $3f] xor
des_SPtrans[7,(t shr 26) and $3f];
Inc(i,8);
end;
r:= (r shr 3) or (r shl 29);
l:= (l shr 3) or (l shl 29);
t:= ((r shr 1) xor l) and $55555555;
l:= l xor t;
r:= r xor (t shl 1);
t:= ((l shr 8) xor r) and $00ff00ff;
r:= r xor t;
l:= l xor (t shl 8);
t:= ((r shr 2) xor l) and $33333333;
l:= l xor t;
r:= r xor (t shl 2);
t:= ((l shr 16) xor r) and $0000ffff;
r:= r xor t;
l:= l xor (t shl 16);
t:= ((r shr 4) xor l) and $0f0f0f0f;
l:= l xor t;
r:= r xor (t shl 4);
PDword(@OutData)^:= l;
PDword(dword(@OutData)+4)^:= r;
end;
procedure TDCP_customdes.DecryptBlock(const InData; var OutData; KeyData: PDWordArray);
var
l, r, t, u: dword;
i: longint;
begin
r:= PDword(@InData)^;
l:= PDword(dword(@InData)+4)^;
t:= ((l shr 4) xor r) and $0f0f0f0f;
r:= r xor t;
l:= l xor (t shl 4);
t:= ((r shr 16) xor l) and $0000ffff;
l:= l xor t;
r:= r xor (t shl 16);
t:= ((l shr 2) xor r) and $33333333;
r:= r xor t;
l:= l xor (t shl 2);
t:= ((r shr 8) xor l) and $00ff00ff;
l:= l xor t;
r:= r xor (t shl 8);
t:= ((l shr 1) xor r) and $55555555;
r:= r xor t;
l:= l xor (t shl 1);
r:= (r shr 29) or (r shl 3);
l:= (l shr 29) or (l shl 3);
i:= 30;
while i> 0 do
begin
u:= r xor KeyData^[i ];
t:= r xor KeyData^[i+1];
t:= (t shr 4) or (t shl 28);
l:= l xor des_SPtrans[0,(u shr 2) and $3f] xor
des_SPtrans[2,(u shr 10) and $3f] xor
des_SPtrans[4,(u shr 18) and $3f] xor
des_SPtrans[6,(u shr 26) and $3f] xor
des_SPtrans[1,(t shr 2) and $3f] xor
des_SPtrans[3,(t shr 10) and $3f] xor
des_SPtrans[5,(t shr 18) and $3f] xor
des_SPtrans[7,(t shr 26) and $3f];
u:= l xor KeyData^[i-2];
t:= l xor KeyData^[i-1];
t:= (t shr 4) or (t shl 28);
r:= r xor des_SPtrans[0,(u shr 2) and $3f] xor
des_SPtrans[2,(u shr 10) and $3f] xor
des_SPtrans[4,(u shr 18) and $3f] xor
des_SPtrans[6,(u shr 26) and $3f] xor
des_SPtrans[1,(t shr 2) and $3f] xor
des_SPtrans[3,(t shr 10) and $3f] xor
des_SPtrans[5,(t shr 18) and $3f] xor
des_SPtrans[7,(t shr 26) and $3f];
u:= r xor KeyData^[i-4];
t:= r xor KeyData^[i-3];
t:= (t shr 4) or (t shl 28);
l:= l xor des_SPtrans[0,(u shr 2) and $3f] xor
des_SPtrans[2,(u shr 10) and $3f] xor
des_SPtrans[4,(u shr 18) and $3f] xor
des_SPtrans[6,(u shr 26) and $3f] xor
des_SPtrans[1,(t shr 2) and $3f] xor
des_SPtrans[3,(t shr 10) and $3f] xor
des_SPtrans[5,(t shr 18) and $3f] xor
des_SPtrans[7,(t shr 26) and $3f];
u:= l xor KeyData^[i-6];
t:= l xor KeyData^[i-5];
t:= (t shr 4) or (t shl 28);
r:= r xor des_SPtrans[0,(u shr 2) and $3f] xor
des_SPtrans[2,(u shr 10) and $3f] xor
des_SPtrans[4,(u shr 18) and $3f] xor
des_SPtrans[6,(u shr 26) and $3f] xor
des_SPtrans[1,(t shr 2) and $3f] xor
des_SPtrans[3,(t shr 10) and $3f] xor
des_SPtrans[5,(t shr 18) and $3f] xor
des_SPtrans[7,(t shr 26) and $3f];
Dec(i,8);
end;
r:= (r shr 3) or (r shl 29);
l:= (l shr 3) or (l shl 29);
t:= ((r shr 1) xor l) and $55555555;
l:= l xor t;
r:= r xor (t shl 1);
t:= ((l shr 8) xor r) and $00ff00ff;
r:= r xor t;
l:= l xor (t shl 8);
t:= ((r shr 2) xor l) and $33333333;
l:= l xor t;
r:= r xor (t shl 2);
t:= ((l shr 16) xor r) and $0000ffff;
r:= r xor t;
l:= l xor (t shl 16);
t:= ((r shr 4) xor l) and $0f0f0f0f;
l:= l xor t;
r:= r xor (t shl 4);
PDword(@OutData)^:= l;
PDword(dword(@OutData)+4)^:= r;
end;
class function TDCP_des.GetMaxKeySize: integer;
begin
Result:= 64;
end;
class function TDCP_des.GetID: integer;
begin
Result:= DCP_des;
end;
class function TDCP_des.GetAlgorithm: string;
begin
Result:= 'DES';
end;
class function TDCP_des.SelfTest: boolean;
const
InData1: array[0..7] of byte=
($07,$56,$D8,$E0,$77,$47,$61,$D2);
OutData1: array[0..7] of byte=
($0C,$D3,$DA,$02,$00,$21,$DC,$09);
Key1: array[0..7] of byte=
($01,$70,$F1,$75,$46,$8F,$B5,$E6);
InData2: array[0..7] of byte=
($48,$0D,$39,$00,$6E,$E7,$62,$F2);
OutData2: array[0..7] of byte=
($A1,$F9,$91,$55,$41,$02,$0B,$56);
Key2: array[0..7] of byte=
($02,$58,$16,$16,$46,$29,$B0,$07);
var
Cipher: TDCP_des;
Data: array[0..7] of byte;
begin
Cipher:= TDCP_des.Create(nil);
Cipher.Init(Key1,Sizeof(Key1)*8,nil);
Cipher.EncryptECB(InData1,Data);
Result:= boolean(CompareMem(@Data,@OutData1,Sizeof(Data)));
Cipher.DecryptECB(Data,Data);
Result:= Result and boolean(CompareMem(@Data,@InData1,Sizeof(Data)));
Cipher.Burn;
Cipher.Init(Key2,Sizeof(Key2)*8,nil);
Cipher.EncryptECB(InData2,Data);
Result:= Result and boolean(CompareMem(@Data,@OutData2,Sizeof(Data)));
Cipher.DecryptECB(Data,Data);
Result:= Result and boolean(CompareMem(@Data,@InData2,Sizeof(Data)));
Cipher.Burn;
Cipher.Free;
end;
procedure TDCP_des.InitKey(const Key; Size: longword);
var
KeyB: array[0..7] of byte;
begin
FillChar(KeyB,Sizeof(KeyB),0);
Move(Key,KeyB,Size div 8);
DoInit(@KeyB,@KeyData);
end;
procedure TDCP_des.Burn;
begin
FillChar(KeyData,Sizeof(KeyData),0);
inherited Burn;
end;
procedure TDCP_des.EncryptECB(const InData; var OutData);
begin
if not fInitialized then
raise EDCP_blockcipher.Create('Cipher not initialized');
EncryptBlock(InData,OutData,@KeyData);
end;
procedure TDCP_des.DecryptECB(const InData; var OutData);
begin
if not fInitialized then
raise EDCP_blockcipher.Create('Cipher not initialized');
DecryptBlock(InData,OutData,@KeyData);
end;
{******************************************************************************}
class function TDCP_3des.GetMaxKeySize: integer;
begin
Result:= 192;
end;
class function TDCP_3des.GetID: integer;
begin
Result:= DCP_3des;
end;
class function TDCP_3des.GetAlgorithm: string;
begin
Result:= '3DES';
end;
class function TDCP_3des.SelfTest: boolean;
const
Key: array[0..23] of byte=
($01,$23,$45,$67,$89,$ab,$cd,$ef,$fe,$dc,$ba,$98,
$76,$54,$32,$10,$89,$ab,$cd,$ef,$01,$23,$45,$67);
PlainText: array[0..7] of byte=
($01,$23,$45,$67,$89,$ab,$cd,$e7);
CipherText: array[0..7] of byte=
($de,$0b,$7c,$06,$ae,$5e,$0e,$d5);
var
Cipher: TDCP_3des;
Block: array[0..7] of byte;
begin
Cipher:= TDCP_3des.Create(nil);
Cipher.Init(Key,Sizeof(Key)*8,nil);
Cipher.EncryptECB(PlainText,Block);
Result:= CompareMem(@Block,@CipherText,Sizeof(CipherText));
Cipher.DecryptECB(Block,Block);
Result:= Result and CompareMem(@Block,@PlainText,Sizeof(PlainText));
Cipher.Free;
end;
procedure TDCP_3des.InitKey(const Key; Size: longword);
var
KeyB: array[0..2,0..7] of byte;
begin
FillChar(KeyB,Sizeof(KeyB),0);
Move(Key,KeyB,Size div 8);
DoInit(@KeyB[0],@KeyData[0]);
DoInit(@KeyB[1],@KeyData[1]);
if Size> 128 then
DoInit(@KeyB[2],@KeyData[2])
else
Move(KeyData[0],KeyData[2],128);
end;
procedure TDCP_3des.Burn;
begin
FillChar(KeyData,Sizeof(KeyData),0);
inherited Burn;
end;
procedure TDCP_3des.EncryptECB(const InData; var OutData);
begin
if not fInitialized then
raise EDCP_blockcipher.Create('Cipher not initialized');
EncryptBlock(InData,OutData,@KeyData[0]);
DecryptBlock(OutData,OutData,@KeyData[1]);
EncryptBlock(OutData,OutData,@KeyData[2]);
end;
procedure TDCP_3des.DecryptECB(const InData; var OutData);
begin
if not fInitialized then
raise EDCP_blockcipher.Create('Cipher not initialized');
DecryptBlock(InData,OutData,@KeyData[2]);
EncryptBlock(OutData,OutData,@KeyData[1]);
DecryptBlock(OutData,OutData,@KeyData[0]);
end;
end.