mirror of
https://github.com/StephenGenusa/DCPCrypt.git
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5fc435d45f
DCPCrypt by David Barton updated and tested with Delphi 2009, 2010, XE, XE2, XE3, XE4, XE5 by Warren Postma. Updated for XE7 by Stephen Genusa.
237 lines
12 KiB
ObjectPascal
237 lines
12 KiB
ObjectPascal
{******************************************************************************}
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{* DCPcrypt v2.1 written by David Barton (crypto@cityinthesky.co.uk) **********}
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{******************************************************************************}
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{* A binary compatible implementation of Gost *********************************}
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{******************************************************************************}
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{******************************************************************************}
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{* !!WARNING!! !!WARNING!! !!WARNING!!!!WARNING!! !!WARNING!! !!WARNING!! *}
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{* *}
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{* I am not sure if this is compatible with the actual GOST standard *}
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{* as a result, use this implementation with extreme caution. *}
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{* *}
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{* !!WARNING!! !!WARNING!! !!WARNING!!!!WARNING!! !!WARNING!! !!WARNING!! *}
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{******************************************************************************}
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{******************************************************************************}
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{* Copyright (c) 1999-2002 David Barton *}
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{* Permission is hereby granted, free of charge, to any person obtaining a *}
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{* copy of this software and associated documentation files (the "Software"), *}
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{* to deal in the Software without restriction, including without limitation *}
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{* the rights to use, copy, modify, merge, publish, distribute, sublicense, *}
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{* and/or sell copies of the Software, and to permit persons to whom the *}
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{* Software is furnished to do so, subject to the following conditions: *}
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{* *}
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{* The above copyright notice and this permission notice shall be included in *}
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{* all copies or substantial portions of the Software. *}
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{* *}
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{* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR *}
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{* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *}
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{* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL *}
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{* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER *}
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{* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING *}
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{* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER *}
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{* DEALINGS IN THE SOFTWARE. *}
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{******************************************************************************}
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unit DCPgost;
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{$INCLUDE '..\dcp.inc'}
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interface
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uses
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Classes, Sysutils, DCPcrypt2, DCPconst, DCPblockciphers;
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type
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TDCP_gost= class(TDCP_blockcipher64)
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protected
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KeyData: array[0..7] of DWord;
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procedure InitKey(const Key; Size: longword); override;
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public
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class function GetId: integer; override;
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class function GetAlgorithm: string; override;
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class function GetMaxKeySize: integer; override;
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class function SelfTest: boolean; override;
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procedure Burn; override;
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procedure EncryptECB(const InData; var OutData); override;
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procedure DecryptECB(const InData; var OutData); override;
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end;
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{******************************************************************************}
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{******************************************************************************}
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implementation
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{$R-}{$Q-}
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{$I DCPgost.inc}
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{$IFDEF DELPHIXE2_UP}
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{$POINTERMATH ON}
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{$ENDIF}
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class function TDCP_gost.GetMaxKeySize: integer;
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begin
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Result:= 256;
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end;
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class function TDCP_gost.GetID: integer;
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begin
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Result:= DCP_gost;
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end;
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class function TDCP_gost.GetAlgorithm: string;
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begin
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Result:= 'Gost';
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end;
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class function TDCP_gost.SelfTest: boolean;
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const
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Key1: array[0..31] of byte=
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($BE,$5E,$C2,$00,$6C,$FF,$9D,$CF,$52,$35,$49,$59,$F1,$FF,$0C,$BF,
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$E9,$50,$61,$B5,$A6,$48,$C1,$03,$87,$06,$9C,$25,$99,$7C,$06,$72);
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InData1: array[0..7] of byte=
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($0D,$F8,$28,$02,$B7,$41,$A2,$92);
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OutData1: array[0..7] of byte=
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($07,$F9,$02,$7D,$F7,$F7,$DF,$89);
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Key2: array[0..31] of byte=
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($B3,$85,$27,$2A,$C8,$D7,$2A,$5A,$8B,$34,$4B,$C8,$03,$63,$AC,$4D,
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$09,$BF,$58,$F4,$1F,$54,$06,$24,$CB,$CB,$8F,$DC,$F5,$53,$07,$D7);
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InData2: array[0..7] of byte=
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($13,$54,$EE,$9C,$0A,$11,$CD,$4C);
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OutData2: array[0..7] of byte=
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($4F,$B5,$05,$36,$F9,$60,$A7,$B1);
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var
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Block: array[0..7] of byte;
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Cipher: TDCP_gost;
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begin
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FillChar(Block, SizeOf(Block), 0);
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Cipher:= TDCP_gost.Create(nil);
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Cipher.Init(Key1,Sizeof(Key1)*8,nil);
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Cipher.EncryptECB(InData1,Block);
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Result:= boolean(CompareMem(@Block,@OutData1,8));
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Cipher.DecryptECB(Block,Block);
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Cipher.Burn;
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Result:= Result and boolean(CompareMem(@Block,@InData1,8));
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Cipher.Init(Key2,Sizeof(Key2)*8,nil);
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Cipher.EncryptECB(InData2,Block);
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Result:= Result and boolean(CompareMem(@Block,@OutData2,8));
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Cipher.DecryptECB(Block,Block);
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Cipher.Burn;
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Result:= Result and boolean(CompareMem(@Block,@InData2,8));
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Cipher.Free;
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end;
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procedure TDCP_gost.InitKey(const Key; Size: longword);
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var
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i: longword;
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userkey: array[0..31] of byte;
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begin
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Size:= Size div 8;
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FillChar(userkey,Sizeof(userkey),0);
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Move(Key,userkey,Size);
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for i:= 0 to 7 do
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KeyData[i]:= (dword(UserKey[4*i+3]) shl 24) or (dword(UserKey[4*i+2]) shl 16) or
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(dword(UserKey[4*i+1]) shl 8) or (dword(UserKey[4*i+0]));
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end;
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procedure TDCP_gost.Burn;
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begin
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FillChar(KeyData,Sizeof(KeyData),0);
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inherited Burn;
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end;
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procedure TDCP_gost.EncryptECB(const InData; var OutData);
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var
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n1, n2: DWord;
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i: longword;
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begin
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if not fInitialized then
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raise EDCP_blockcipher.Create('Cipher not initialized');
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n1:= PDword(@InData)^;
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n2:= PDword(PointerToInt(@InData)+4)^;
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for i:= 0 to 2 do
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begin
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n2:= n2 xor (sTable[3,(n1+KeyData[0]) shr 24] xor sTable[2,((n1+KeyData[0]) shr 16) and $FF]
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xor sTable[1,((n1+KeyData[0]) shr 8) and $FF] xor sTable[0,(n1+KeyData[0]) and $FF]);
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n1:= n1 xor (sTable[3,(n2+KeyData[1]) shr 24] xor sTable[2,((n2+KeyData[1]) shr 16) and $FF]
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xor sTable[1,((n2+KeyData[1]) shr 8) and $FF] xor sTable[0,(n2+KeyData[1]) and $FF]);
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n2:= n2 xor (sTable[3,(n1+KeyData[2]) shr 24] xor sTable[2,((n1+KeyData[2]) shr 16) and $FF]
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xor sTable[1,((n1+KeyData[2]) shr 8) and $FF] xor sTable[0,(n1+KeyData[2]) and $FF]);
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n1:= n1 xor (sTable[3,(n2+KeyData[3]) shr 24] xor sTable[2,((n2+KeyData[3]) shr 16) and $FF]
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xor sTable[1,((n2+KeyData[3]) shr 8) and $FF] xor sTable[0,(n2+KeyData[3]) and $FF]);
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n2:= n2 xor (sTable[3,(n1+KeyData[4]) shr 24] xor sTable[2,((n1+KeyData[4]) shr 16) and $FF]
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xor sTable[1,((n1+KeyData[4]) shr 8) and $FF] xor sTable[0,(n1+KeyData[4]) and $FF]);
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n1:= n1 xor (sTable[3,(n2+KeyData[5]) shr 24] xor sTable[2,((n2+KeyData[5]) shr 16) and $FF]
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xor sTable[1,((n2+KeyData[5]) shr 8) and $FF] xor sTable[0,(n2+KeyData[5]) and $FF]);
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n2:= n2 xor (sTable[3,(n1+KeyData[6]) shr 24] xor sTable[2,((n1+KeyData[6]) shr 16) and $FF]
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xor sTable[1,((n1+KeyData[6]) shr 8) and $FF] xor sTable[0,(n1+KeyData[6]) and $FF]);
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n1:= n1 xor (sTable[3,(n2+KeyData[7]) shr 24] xor sTable[2,((n2+KeyData[7]) shr 16) and $FF]
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xor sTable[1,((n2+KeyData[7]) shr 8) and $FF] xor sTable[0,(n2+KeyData[7]) and $FF]);
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end;
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n2:= n2 xor (sTable[3,(n1+KeyData[7]) shr 24] xor sTable[2,((n1+KeyData[7]) shr 16) and $FF]
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xor sTable[1,((n1+KeyData[7]) shr 8) and $FF] xor sTable[0,(n1+KeyData[7]) and $FF]);
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n1:= n1 xor (sTable[3,(n2+KeyData[6]) shr 24] xor sTable[2,((n2+KeyData[6]) shr 16) and $FF]
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xor sTable[1,((n2+KeyData[6]) shr 8) and $FF] xor sTable[0,(n2+KeyData[6]) and $FF]);
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n2:= n2 xor (sTable[3,(n1+KeyData[5]) shr 24] xor sTable[2,((n1+KeyData[5]) shr 16) and $FF]
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xor sTable[1,((n1+KeyData[5]) shr 8) and $FF] xor sTable[0,(n1+KeyData[5]) and $FF]);
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n1:= n1 xor (sTable[3,(n2+KeyData[4]) shr 24] xor sTable[2,((n2+KeyData[4]) shr 16) and $FF]
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xor sTable[1,((n2+KeyData[4]) shr 8) and $FF] xor sTable[0,(n2+KeyData[4]) and $FF]);
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n2:= n2 xor (sTable[3,(n1+KeyData[3]) shr 24] xor sTable[2,((n1+KeyData[3]) shr 16) and $FF]
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xor sTable[1,((n1+KeyData[3]) shr 8) and $FF] xor sTable[0,(n1+KeyData[3]) and $FF]);
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n1:= n1 xor (sTable[3,(n2+KeyData[2]) shr 24] xor sTable[2,((n2+KeyData[2]) shr 16) and $FF]
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xor sTable[1,((n2+KeyData[2]) shr 8) and $FF] xor sTable[0,(n2+KeyData[2]) and $FF]);
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n2:= n2 xor (sTable[3,(n1+KeyData[1]) shr 24] xor sTable[2,((n1+KeyData[1]) shr 16) and $FF]
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xor sTable[1,((n1+KeyData[1]) shr 8) and $FF] xor sTable[0,(n1+KeyData[1]) and $FF]);
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n1:= n1 xor (sTable[3,(n2+KeyData[0]) shr 24] xor sTable[2,((n2+KeyData[0]) shr 16) and $FF]
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xor sTable[1,((n2+KeyData[0]) shr 8) and $FF] xor sTable[0,(n2+KeyData[0]) and $FF]);
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PDword(@OutData)^:= n2;
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PDword(PointerToInt(@OutData)+4)^:= n1;
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end;
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procedure TDCP_gost.DecryptECB(const InData; var OutData);
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var
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n1, n2: DWord;
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i: longword;
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begin
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if not fInitialized then
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raise EDCP_blockcipher.Create('Cipher not initialized');
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n1:= PDword(@InData)^;
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n2:= PDword(PointerToInt(@InData)+4)^;
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n2:= n2 xor (sTable[3,(n1+KeyData[0]) shr 24] xor sTable[2,((n1+KeyData[0]) shr 16) and $FF]
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xor sTable[1,((n1+KeyData[0]) shr 8) and $FF] xor sTable[0,(n1+KeyData[0]) and $FF]);
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n1:= n1 xor (sTable[3,(n2+KeyData[1]) shr 24] xor sTable[2,((n2+KeyData[1]) shr 16) and $FF]
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xor sTable[1,((n2+KeyData[1]) shr 8) and $FF] xor sTable[0,(n2+KeyData[1]) and $FF]);
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n2:= n2 xor (sTable[3,(n1+KeyData[2]) shr 24] xor sTable[2,((n1+KeyData[2]) shr 16) and $FF]
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xor sTable[1,((n1+KeyData[2]) shr 8) and $FF] xor sTable[0,(n1+KeyData[2]) and $FF]);
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n1:= n1 xor (sTable[3,(n2+KeyData[3]) shr 24] xor sTable[2,((n2+KeyData[3]) shr 16) and $FF]
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xor sTable[1,((n2+KeyData[3]) shr 8) and $FF] xor sTable[0,(n2+KeyData[3]) and $FF]);
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n2:= n2 xor (sTable[3,(n1+KeyData[4]) shr 24] xor sTable[2,((n1+KeyData[4]) shr 16) and $FF]
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xor sTable[1,((n1+KeyData[4]) shr 8) and $FF] xor sTable[0,(n1+KeyData[4]) and $FF]);
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n1:= n1 xor (sTable[3,(n2+KeyData[5]) shr 24] xor sTable[2,((n2+KeyData[5]) shr 16) and $FF]
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xor sTable[1,((n2+KeyData[5]) shr 8) and $FF] xor sTable[0,(n2+KeyData[5]) and $FF]);
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n2:= n2 xor (sTable[3,(n1+KeyData[6]) shr 24] xor sTable[2,((n1+KeyData[6]) shr 16) and $FF]
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xor sTable[1,((n1+KeyData[6]) shr 8) and $FF] xor sTable[0,(n1+KeyData[6]) and $FF]);
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n1:= n1 xor (sTable[3,(n2+KeyData[7]) shr 24] xor sTable[2,((n2+KeyData[7]) shr 16) and $FF]
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xor sTable[1,((n2+KeyData[7]) shr 8) and $FF] xor sTable[0,(n2+KeyData[7]) and $FF]);
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for i:= 0 to 2 do
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begin
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n2:= n2 xor (sTable[3,(n1+KeyData[7]) shr 24] xor sTable[2,((n1+KeyData[7]) shr 16) and $FF]
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xor sTable[1,((n1+KeyData[7]) shr 8) and $FF] xor sTable[0,(n1+KeyData[7]) and $FF]);
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n1:= n1 xor (sTable[3,(n2+KeyData[6]) shr 24] xor sTable[2,((n2+KeyData[6]) shr 16) and $FF]
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xor sTable[1,((n2+KeyData[6]) shr 8) and $FF] xor sTable[0,(n2+KeyData[6]) and $FF]);
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n2:= n2 xor (sTable[3,(n1+KeyData[5]) shr 24] xor sTable[2,((n1+KeyData[5]) shr 16) and $FF]
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xor sTable[1,((n1+KeyData[5]) shr 8) and $FF] xor sTable[0,(n1+KeyData[5]) and $FF]);
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n1:= n1 xor (sTable[3,(n2+KeyData[4]) shr 24] xor sTable[2,((n2+KeyData[4]) shr 16) and $FF]
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xor sTable[1,((n2+KeyData[4]) shr 8) and $FF] xor sTable[0,(n2+KeyData[4]) and $FF]);
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n2:= n2 xor (sTable[3,(n1+KeyData[3]) shr 24] xor sTable[2,((n1+KeyData[3]) shr 16) and $FF]
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xor sTable[1,((n1+KeyData[3]) shr 8) and $FF] xor sTable[0,(n1+KeyData[3]) and $FF]);
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n1:= n1 xor (sTable[3,(n2+KeyData[2]) shr 24] xor sTable[2,((n2+KeyData[2]) shr 16) and $FF]
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xor sTable[1,((n2+KeyData[2]) shr 8) and $FF] xor sTable[0,(n2+KeyData[2]) and $FF]);
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n2:= n2 xor (sTable[3,(n1+KeyData[1]) shr 24] xor sTable[2,((n1+KeyData[1]) shr 16) and $FF]
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xor sTable[1,((n1+KeyData[1]) shr 8) and $FF] xor sTable[0,(n1+KeyData[1]) and $FF]);
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n1:= n1 xor (sTable[3,(n2+KeyData[0]) shr 24] xor sTable[2,((n2+KeyData[0]) shr 16) and $FF]
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xor sTable[1,((n2+KeyData[0]) shr 8) and $FF] xor sTable[0,(n2+KeyData[0]) and $FF]);
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end;
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PDword(@OutData)^:= n2;
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PDword(PointerToInt(@OutData)+4)^:= n1;
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end;
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end.
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