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DECCipher.pas
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{*****************************************************************************
Delphi Encryption Compendium (DEC Part I)
Version 5.2, Part I, for Delphi 7 - 10.2 Tokyo or higher/FPC 2.6 or higher
Remarks: Freeware, Copyright must be included
Original Author: (c) 2006 Hagen Reddmann, HaReddmann [at] T-Online [dot] de
Modifications: (c) 2008 Arvid Winkelsdorf, info [at] digivendo [dot] de
Last change: 19. November 2017
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ''AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*****************************************************************************}
unit DECCipher;
{$IFDEF FPC}
{$MODE Delphi}
{$ENDIF}
{$RANGECHECKS OFF}
interface
uses SysUtils, Classes, DECUtil, DECFmt;
{$I Ver.inc}
type
TCipher_Null = class; // Null cipher, does'nt encrypt, copying only
TCipher_Blowfish = class;
TCipher_Twofish = class; {AES Round 2 Final Candidate}
TCipher_IDEA = class;
TCipher_Cast256 = class;
TCipher_Mars = class; {AES Round 2 Final Candidate}
TCipher_RC4 = class; {Streamcipher in as Block Cipher}
TCipher_RC6 = class; {AES Round 2 Final Candidate}
TCipher_Rijndael = class; {AES Round 2 Final Candidate}
TCipher_Square = class;
TCipher_SCOP = class; {Streamcipher on Longword, very fast}
TCipher_Sapphire = class; {Stream Cipher, eq. Design from german ENIGMA Machine}
TCipher_1DES = class; {Single DES 8 byte Blocksize, 8 byte Keysize 56 bits relevant}
TCipher_2DES = class; {Triple DES 8 byte Blocksize, 16 byte Keysize 112 bits relevant}
TCipher_3DES = class; {Triple DES 8 byte Blocksize, 24 byte Keysize 168 bits relevant}
TCipher_2DDES = class; {Triple DES 16 byte Blocksize, 16 byte Keysize 112 bits relevant}
TCipher_3DDES = class; {Triple DES 16 byte Blocksize, 24 byte Keysize 168 bits relevant}
TCipher_3TDES = class; {Triple DES 24 byte Blocksize, 24 byte Keysize 168 bits relevant}
TCipher_3Way = class;
TCipher_Cast128 = class;
TCipher_Gost = class;
TCipher_Misty = class;
TCipher_NewDES = class;
TCipher_Q128 = class;
TCipher_RC2 = class;
TCipher_RC5 = class;
TCipher_SAFER = class;
TCipher_Shark = class;
TCipher_Skipjack = class;
TCipher_TEA = class;
TCipher_TEAN = class;
TCipherContext = packed record
KeySize: Integer; // maximal key size in bytes
BlockSize: Integer; // mininmal block size in bytes, eg. 1 = Streamcipher
BufferSize: Integer; // internal buffersize in bytes
UserSize: Integer; // internal size in bytes of cipher dependend structures
UserSave: Boolean;
end;
TCipherState = (csNew, csInitialized, csEncode, csDecode, csPadded, csDone);
TCipherStates = set of TCipherState;
{ TCipher.State represents the internal state of processing
csNew = cipher isn't initialized, .Init() must be called before en/decode
csInitialized = cipher is initialized by .Init(), eg. Keysetup was processed
csEncode = Encodeing was started, and more chunks can be encoded, but not decoded
csDecode = Decodeing was started, and more chunks can be decoded, but not encoded
csPadded = trough En/Decodeing the messagechunks are padded, no more chunks can
be processed, the cipher is blocked.
csDone = Processing is finished and Cipher.Done was called. Now new En/Decoding
can be started without calling .Init() before. csDone is basicaly
identical to csInitialized, except Cipher.Buffer holds the encrypted
last state of Cipher.Feedback, thus Cipher.Buffer can be used as C-MAC.}
TCipherMode = (cmCTSx, cmCBCx, cmCFB8, cmCFBx, cmOFB8, cmOFBx, cmCFS8, cmCFSx, cmECBx);
{ cmCTSx = double CBC, with CFS8 padding of truncated final block
cmCBCx = Cipher Block Chainung, with CFB8 padding of truncated final block
cmCFB8 = 8bit Cipher Feedback mode
cmCFBx = CFB on Blocksize of Cipher
cmOFB8 = 8bit Output Feedback mode
cmOFBx = OFB on Blocksize bytes
cmCFS8 = 8Bit CFS, double CFB
cmCFSx = CFS on Blocksize bytes
cmECBx = Electronic Code Book
Modes cmCBCx, cmCTSx, cmCFBx, cmOFBx, cmCFSx, cmECBx working on Blocks of
Cipher.BufferSize bytes, on Blockcipher that's equal to Cipher.BlockSize.
Modes cmCFB8, cmOFB8, cmCFS8 work on 8 bit Feedback Shift Registers.
Modes cmCTSx, cmCFSx, cmCFS8 are proprietary modes developed by me. These modes
works such as cmCBCx, cmCFBx, cmCFB8 but with double XOR'ing of the inputstream
into Feedback register.
Mode cmECBx need message padding to a multiple of Cipher.BlockSize and should
be only used in 1byte Streamciphers.
Modes cmCTSx, cmCBCx need no external padding, because internal the last truncated
block is padded by cmCFS8 or cmCFB8. After padding these Mode can't be used to
process more data. If it needed to process chunks of data then each chunk must
be algined to Cipher.BufferSize bytes.
Modes cmCFBx,cmCFB8,cmOFBx,cmOFB8,cmCFSx,cmCFS8 need no padding.
}
TDECCipherCodeEvent = procedure(const Source; var Dest; DataSize: Integer) of object;
TDECCipherClass = class of TDECCipher;
TDECCipher = class(TDECObject)
private
FState: TCipherState;
FMode: TCipherMode;
FData: PByteArray;
FDataSize: Integer;
procedure SetMode(Value: TCipherMode);
protected
FBufferSize: Integer;
FBufferIndex: Integer;
FUserSize: Integer;
FBuffer: PByteArray;
FVector: PByteArray;
FFeedback: PByteArray;
FUser: Pointer;
FUserSave: Pointer;
procedure CheckState(States: TCipherStates);
procedure DoInit(const Key; Size: Integer); virtual; abstract;
procedure DoEncode(Source, Dest: Pointer; Size: Integer); virtual; abstract;
procedure DoDecode(Source, Dest: Pointer; Size: Integer); virtual; abstract;
public
constructor Create; override;
destructor Destroy; override;
class function Context: TCipherContext; virtual; abstract;
procedure Init(const Key; Size: Integer; const IVector; IVectorSize: Integer; IFiller: Byte = $FF); overload;
procedure Init(const Key: Binary; const IVector: Binary = ''; IFiller: Byte = $FF); overload;
procedure Done;
procedure Protect; virtual;
procedure Encode(const Source; var Dest; DataSize: Integer);
procedure Decode(const Source; var Dest; DataSize: Integer);
function EncodeBinary(const Source: Binary; Format: TDECFormatClass = nil): Binary;
function DecodeBinary(const Source: Binary; Format: TDECFormatClass = nil): Binary;
procedure EncodeFile(const Source, Dest: String; const Progress: IDECProgress = nil);
procedure DecodeFile(const Source, Dest: String; const Progress: IDECProgress = nil);
procedure EncodeStream(const Source, Dest: TStream; const DataSize: Int64; const Progress: IDECProgress = nil);
procedure DecodeStream(const Source, Dest: TStream; const DataSize: Int64; const Progress: IDECProgress = nil);
function CalcMAC(Format: TDECFormatClass = nil): Binary;
property InitVectorSize: Integer read FBufferSize;
property InitVector: PByteArray read FVector; // buffer size bytes
property Feedback: PByteArray read FFeedback; // buffer size bytes
property State: TCipherState read FState;
published
property Mode: TCipherMode read FMode write SetMode;
end;
TCipher_Null = class(TDECCipher)
protected
procedure DoInit(const Key; Size: Integer); override;
procedure DoEncode(Source, Dest: Pointer; Size: Integer); override;
procedure DoDecode(Source, Dest: Pointer; Size: Integer); override;
public
class function Context: TCipherContext; override;
end;
TCipher_Blowfish = class(TDECCipher)
protected
procedure DoInit(const Key; Size: Integer); override;
procedure DoEncode(Source, Dest: Pointer; Size: Integer); override;
procedure DoDecode(Source, Dest: Pointer; Size: Integer); override;
public
class function Context: TCipherContext; override;
end;
TCipher_Twofish = class(TDECCipher)
protected
procedure DoInit(const Key; Size: Integer); override;
procedure DoEncode(Source, Dest: Pointer; Size: Integer); override;
procedure DoDecode(Source, Dest: Pointer; Size: Integer); override;
public
class function Context: TCipherContext; override;
end;
TCipher_IDEA = class(TDECCipher) {International Data Encryption Algorithm }
protected
procedure DoInit(const Key; Size: Integer); override;
procedure DoEncode(Source, Dest: Pointer; Size: Integer); override;
procedure DoDecode(Source, Dest: Pointer; Size: Integer); override;
public
class function Context: TCipherContext; override;
end;
TCipher_Cast256 = class(TDECCipher)
protected
procedure DoInit(const Key; Size: Integer); override;
procedure DoEncode(Source, Dest: Pointer; Size: Integer); override;
procedure DoDecode(Source, Dest: Pointer; Size: Integer); override;
public
class function Context: TCipherContext; override;
end;
TCipher_Mars = class(TDECCipher)
protected
procedure DoInit(const Key; Size: Integer); override;
procedure DoEncode(Source, Dest: Pointer; Size: Integer); override;
procedure DoDecode(Source, Dest: Pointer; Size: Integer); override;
public
class function Context: TCipherContext; override;
end;
TCipher_RC4 = class(TDECCipher)
protected
procedure DoInit(const Key; Size: Integer); override;
procedure DoEncode(Source, Dest: Pointer; Size: Integer); override;
procedure DoDecode(Source, Dest: Pointer; Size: Integer); override;
public
class function Context: TCipherContext; override;
end;
TCipher_RC6 = class(TDECCipher)
private
FRounds: Integer; {16-24, default 20}
procedure SetRounds(Value: Integer);
protected
procedure DoInit(const Key; Size: Integer); override;
procedure DoEncode(Source, Dest: Pointer; Size: Integer); override;
procedure DoDecode(Source, Dest: Pointer; Size: Integer); override;
public
class function Context: TCipherContext; override;
published
property Rounds: Integer read FRounds write SetRounds;
end;
TCipher_Rijndael = class(TDECCipher)
private
FRounds: Integer;
protected
procedure DoInit(const Key; Size: Integer); override;
procedure DoEncode(Source, Dest: Pointer; Size: Integer); override;
procedure DoDecode(Source, Dest: Pointer; Size: Integer); override;
public
class function Context: TCipherContext; override;
published
property Rounds: Integer read FRounds;
end;
TCipher_Square = class(TDECCipher)
protected
procedure DoInit(const Key; Size: Integer); override;
procedure DoEncode(Source, Dest: Pointer; Size: Integer); override;
procedure DoDecode(Source, Dest: Pointer; Size: Integer); override;
public
class function Context: TCipherContext; override;
end;
TCipher_SCOP = class(TDECCipher) {Stream Cipher in Blockmode}
protected
procedure DoInit(const Key; Size: Integer); override;
procedure DoEncode(Source, Dest: Pointer; Size: Integer); override;
procedure DoDecode(Source, Dest: Pointer; Size: Integer); override;
public
class function Context: TCipherContext; override;
end;
TCipher_Sapphire = class(TDECCipher)
protected
procedure DoInit(const Key; Size: Integer); override;
procedure DoEncode(Source, Dest: Pointer; Size: Integer); override;
procedure DoDecode(Source, Dest: Pointer; Size: Integer); override;
public
class function Context: TCipherContext; override;
end;
TCipher_1DES = class(TDECCipher)
protected
procedure DoInitKey(const Data: array of Byte; Key: PLongArray; Reverse: Boolean);
procedure DoInit(const Key; Size: Integer); override;
procedure DoEncode(Source, Dest: Pointer; Size: Integer); override;
procedure DoDecode(Source, Dest: Pointer; Size: Integer); override;
public
class function Context: TCipherContext; override;
end;
TCipher_2DES = class(TCipher_1DES)
protected
procedure DoInit(const Key; Size: Integer); override;
procedure DoEncode(Source, Dest: Pointer; Size: Integer); override;
procedure DoDecode(Source, Dest: Pointer; Size: Integer); override;
public
class function Context: TCipherContext; override;
end;
TCipher_3DES = class(TCipher_1DES)
protected
procedure DoInit(const Key; Size: Integer); override;
procedure DoEncode(Source, Dest: Pointer; Size: Integer); override;
procedure DoDecode(Source, Dest: Pointer; Size: Integer); override;
public
class function Context: TCipherContext; override;
end;
TCipher_2DDES = class(TCipher_2DES)
protected
procedure DoEncode(Source, Dest: Pointer; Size: Integer); override;
procedure DoDecode(Source, Dest: Pointer; Size: Integer); override;
public
class function Context: TCipherContext; override;
end;
TCipher_3DDES = class(TCipher_3DES)
protected
procedure DoEncode(Source, Dest: Pointer; Size: Integer); override;
procedure DoDecode(Source, Dest: Pointer; Size: Integer); override;
public
class function Context: TCipherContext; override;
end;
TCipher_3TDES = class(TCipher_3DES)
protected
procedure DoEncode(Source, Dest: Pointer; Size: Integer); override;
procedure DoDecode(Source, Dest: Pointer; Size: Integer); override;
public
class function Context: TCipherContext; override;
end;
TCipher_3Way = class(TDECCipher)
protected
procedure DoInit(const Key; Size: Integer); override;
procedure DoEncode(Source, Dest: Pointer; Size: Integer); override;
procedure DoDecode(Source, Dest: Pointer; Size: Integer); override;
public
class function Context: TCipherContext; override;
end;
TCipher_Cast128 = class(TDECCipher) {Carlisle Adams and Stafford Tavares }
private
FRounds: Integer;
procedure SetRounds(Value: Integer);
protected
procedure DoInit(const Key; Size: Integer); override;
procedure DoEncode(Source, Dest: Pointer; Size: Integer); override;
procedure DoDecode(Source, Dest: Pointer; Size: Integer); override;
public
class function Context: TCipherContext; override;
published
property Rounds: Integer read FRounds write SetRounds;
end;
TCipher_Gost = class(TDECCipher) {russian Cipher}
protected
procedure DoInit(const Key; Size: Integer); override;
procedure DoEncode(Source, Dest: Pointer; Size: Integer); override;
procedure DoDecode(Source, Dest: Pointer; Size: Integer); override;
public
class function Context: TCipherContext; override;
end;
TCipher_Misty = class(TDECCipher)
protected
procedure DoInit(const Key; Size: Integer); override;
procedure DoEncode(Source, Dest: Pointer; Size: Integer); override;
procedure DoDecode(Source, Dest: Pointer; Size: Integer); override;
public
class function Context: TCipherContext; override;
end;
{ This algorithm resembles the Data Encryption Standard (DES), but is easier
to implement in software and is supposed to be more secure.
It is not to be confused with another algorithm--known by the
same name--which is simply DES without the initial and final
permutations. The NewDES here is a completely different algorithm.}
TCipher_NewDES = class(TDECCipher)
protected
procedure DoInit(const Key; Size: Integer); override;
procedure DoEncode(Source, Dest: Pointer; Size: Integer); override;
procedure DoDecode(Source, Dest: Pointer; Size: Integer); override;
public
class function Context: TCipherContext; override;
end;
TCipher_Q128 = class(TDECCipher)
protected
procedure DoInit(const Key; Size: Integer); override;
procedure DoEncode(Source, Dest: Pointer; Size: Integer); override;
procedure DoDecode(Source, Dest: Pointer; Size: Integer); override;
public
class function Context: TCipherContext; override;
end;
TCipher_RC2 = class(TDECCipher)
protected
procedure DoInit(const Key; Size: Integer); override;
procedure DoEncode(Source, Dest: Pointer; Size: Integer); override;
procedure DoDecode(Source, Dest: Pointer; Size: Integer); override;
public
class function Context: TCipherContext; override;
end;
TCipher_RC5 = class(TDECCipher)
private
FRounds: Integer; {8-16, default 12}
procedure SetRounds(Value: Integer);
protected
procedure DoInit(const Key; Size: Integer); override;
procedure DoEncode(Source, Dest: Pointer; Size: Integer); override;
procedure DoDecode(Source, Dest: Pointer; Size: Integer); override;
public
class function Context: TCipherContext; override;
published
property Rounds: Integer read FRounds write SetRounds;
end;
TSAFERVersion = (svSK128, svSK64, svSK40, svK128, svK64, svK40);
{svK40 SAFER K-40 Keysize is 40bit -> 5 Byte
svK64 SAFER K-64 Keysize is 64bit -> 8 Byte
svK128 SAFER K-128 KeySize is 128bit -> 16 Byte
svSK40 SAFER SK-40 stronger Version from K-40 with better Keyscheduling
svSK64 SAFER SK-64 stronger Version from K-64 with better Keyscheduling
svSK128 SAFER SK-128 stronger Version from K-128 with better Keyscheduling}
TCipher_SAFER = class(TDECCipher) {SAFER = Secure And Fast Encryption Routine}
private
FRounds: Integer;
FVersion: TSAFERVersion;
procedure SetRounds(Value: Integer);
procedure SetVersion(Value: TSAFERVersion);
protected
procedure DoInit(const Key; Size: Integer); override;
procedure DoEncode(Source, Dest: Pointer; Size: Integer); override;
procedure DoDecode(Source, Dest: Pointer; Size: Integer); override;
public
class function Context: TCipherContext; override;
published
property Rounds: Integer read FRounds write SetRounds;
property Version: TSAFERVersion read FVersion write SetVersion;
end;
TCipher_Shark = class(TDECCipher)
protected
procedure DoInit(const Key; Size: Integer); override;
procedure DoEncode(Source, Dest: Pointer; Size: Integer); override;
procedure DoDecode(Source, Dest: Pointer; Size: Integer); override;
public
class function Context: TCipherContext; override;
end;
TCipher_Skipjack = class(TDECCipher)
protected
procedure DoInit(const Key; Size: Integer); override;
procedure DoEncode(Source, Dest: Pointer; Size: Integer); override;
procedure DoDecode(Source, Dest: Pointer; Size: Integer); override;
public
class function Context: TCipherContext; override;
end;
TCipher_TEA = class(TDECCipher) {Tiny Encryption Algorithm}
private
FRounds: Integer; {16 - 32, default 16 is sufficient, 32 is ample}
procedure SetRounds(Value: Integer);
protected
procedure DoInit(const Key; Size: Integer); override;
procedure DoEncode(Source, Dest: Pointer; Size: Integer); override;
procedure DoDecode(Source, Dest: Pointer; Size: Integer); override;
public
class function Context: TCipherContext; override;
published
property Rounds: Integer read FRounds write SetRounds;
end;
TCipher_TEAN = class(TCipher_TEA) {Tiny Encryption Algorithm, extended Version}
protected
procedure DoEncode(Source, Dest: Pointer; Size: Integer); override;
procedure DoDecode(Source, Dest: Pointer; Size: Integer); override;
end;
function ValidCipher(CipherClass: TDECCipherClass = nil): TDECCipherClass;
function CipherByName(const Name: String): TDECCipherClass;
function CipherByIdentity(Identity: LongWord): TDECCipherClass;
procedure SetDefaultCipherClass(CipherClass: TDECCipherClass = nil);
var
StreamBufferSize: Integer = 8192;
implementation
uses TypInfo, DECData;
resourcestring
sAlreadyPadded = 'Cipher has already been padded, cannot process message';
sInvalidState = 'Cipher is not in valid state for this action';
sInvalidMessageLength = 'Message length for %s must be a multiple of %d bytes';
sKeyMaterialToLarge = 'Keymaterial is too large for use (Security Issue)';
sIVMaterialToLarge = 'Initvector is too large for use (Security Issue)';
sInvalidMACMode = 'Invalid Cipher mode to compute MAC';
sCipherNoDefault = 'No default cipher has been registered';
var
FDefaultCipherClass: TDECCipherClass = nil;
function ValidCipher(CipherClass: TDECCipherClass): TDECCipherClass;
begin
if CipherClass <> nil then Result := CipherClass
else Result := FDefaultCipherClass;
if Result = nil then raise EDECException.Create(sCipherNoDefault);
end;
function CipherByName(const Name: String): TDECCipherClass;
begin
Result := TDECCipherClass(DECClassByName(Name, TDECCipher));
end;
function CipherByIdentity(Identity: LongWord): TDECCipherClass;
begin
Result := TDECCipherClass(DECClassByIdentity(Identity, TDECCipher));
end;
procedure SetDefaultCipherClass(CipherClass: TDECCipherClass);
begin
if CipherClass <> nil then CipherClass.Register;
FDefaultCipherClass := CipherClass;
end;
procedure TDECCipher.SetMode(Value: TCipherMode);
begin
if Value <> FMode then
begin
if not (FState in [csNew, csInitialized, csDone]) then Done;
FMode := Value;
end;
end;
procedure TDECCipher.CheckState(States: TCipherStates);
var
S: String;
begin
if not (FState in States) then
begin
if FState = csPadded then S := sAlreadyPadded
else S := sInvalidState;
raise EDECException.Create(S);
end;
end;
constructor TDECCipher.Create;
var
MustUserSaved: Boolean;
begin
inherited Create;
with Context do
begin
FBufferSize := BufferSize;
FUserSize := UserSize;
MustUserSaved := UserSave;
end;
FDataSize := FBufferSize * 3 + FUserSize;
if MustUserSaved then Inc(FDataSize, FUserSize);
ReallocMem(FData, FDataSize);
FVector := @FData[0];
FFeedback := @FVector[FBufferSize];
FBuffer := @FFeedback[FBufferSize];
FUser := @FBuffer[FBufferSize];
if MustUserSaved then FUserSave := @PByteArray(FUser)[FUserSize]
else FUserSave := nil;
Protect;
end;
destructor TDECCipher.Destroy;
begin
Protect;
ReallocMem(FData, 0);
FVector := nil;
FFeedback := nil;
FBuffer := nil;
FUser := nil;
FUserSave := nil;
inherited Destroy;
end;
procedure TDECCipher.Init(const Key; Size: Integer; const IVector; IVectorSize: Integer; IFiller: Byte);
begin
Protect;
if Size > Context.KeySize then
raise EDECException.Create(sKeyMaterialToLarge);
if IVectorSize > FBufferSize then
raise EDECException.Create(sIVMaterialToLarge);
DoInit(Key, Size);
if FUserSave <> nil then
Move(FUser^, FUserSave^, FUserSize);
FillChar(FVector^, FBufferSize, IFiller);
if IVectorSize = 0 then
begin
DoEncode(FVector, FVector, FBufferSize);
if FUserSave <> nil then Move(FUserSave^, FUser^, FUserSize);
end else Move(IVector, FVector^, IVectorSize);
Move(FVector^, FFeedback^, FBufferSize);
FState := csInitialized;
end;
procedure TDECCipher.Init(const Key: Binary; const IVector: Binary; IFiller: Byte);
begin
Init(Key[1], Length(Key), IVector[1], Length(IVector), IFiller);
end;
procedure TDECCipher.Done;
begin
if FState <> csDone then
begin
FState := csDone;
FBufferIndex := 0;
DoEncode(FFeedback, FBuffer, FBufferSize);
Move(FVector^, FFeedback^, FBufferSize);
if FUserSave <> nil then
Move(FUserSave^, FUser^, FUserSize);
end;
end;
procedure TDECCipher.Protect;
begin
FState := csNew;
ProtectBuffer(FData[0], FDataSize);
end;
procedure InvalidMessageLength(Cipher: TDECCipher);
begin
with Cipher do
raise EDECException.CreateFmt(sInvalidMessageLength,
[TypInfo.GetEnumName(TypeInfo(TCipherMode), Integer(FMode)), Context.BlockSize]);
end;
procedure TDECCipher.Encode(const Source; var Dest; DataSize: Integer);
procedure EncodeECBx(S,D: PByteArray; Size: Integer);
var
I: Integer;
begin
if Context.BlockSize = 1 then
begin
DoEncode(S, D, Size);
FState := csEncode;
end else
begin
Dec(Size, FBufferSize);
I := 0;
while I <= Size do
begin
DoEncode(@S[I], @D[I], FBufferSize);
Inc(I, FBufferSize);
end;
Dec(Size, I - FBufferSize);
if Size > 0 then
if Size mod Context.BlockSize = 0 then
begin
DoEncode(@S[I], @D[I], Size);
FState := csEncode;
end else
begin
FState := csPadded;
InvalidMessageLength(Self);
end;
end;
end;
procedure EncodeCFB8(S,D: PByteArray; Size: Integer);
// CFB-8
var
I: Integer;
begin
I := 0;
while I < Size do
begin
DoEncode(FFeedback, FBuffer, FBufferSize);
Move(FFeedback[1], FFeedback[0], FBufferSize -1);
D[I] := S[I] xor FBuffer[0];
FFeedback[FBufferSize -1] := D[I];
Inc(I);
end;
FState := csEncode;
end;
procedure EncodeOFB8(S,D: PByteArray; Size: Integer);
var
I: Integer;
begin
I := 0;
while I < Size do
begin
DoEncode(FFeedback, FBuffer, FBufferSize);
Move(FFeedback[1], FFeedback[0], FBufferSize -1);
FFeedback[FBufferSize -1] := FBuffer[0];
D[I] := S[I] xor FBuffer[0];
Inc(I);
end;
FState := csEncode;
end;
procedure EncodeCFS8(S,D: PByteArray; Size: Integer);
// CFS-8, CTS as CFB
var
I: Integer;
begin
I := 0;
while I < Size do
begin
DoEncode(FFeedback, FBuffer, FBufferSize);
D[I] := S[I] xor FBuffer[0];
Move(FFeedback[1], FFeedback[0], FBufferSize -1);
FFeedback[FBufferSize -1] := FFeedback[FBufferSize -1] xor D[I];
Inc(I);
end;
FState := csEncode;
end;
procedure EncodeCFBx(S,D: PByteArray; Size: Integer);
// CFB-BlockSize
var
I: Integer;
F: PByteArray;
begin
FState := csEncode;
if FBufferIndex > 0 then
begin
I := FBufferSize - FBufferIndex;
if I > Size then I := Size;
XORBuffers(S[0], FBuffer[FBufferIndex], I, D[0]);
Move(D[0], FFeedback[FBufferIndex], I);
Inc(FBufferIndex, I);
if FBufferIndex < FBufferSize then Exit;
Dec(Size, I);
S := @S[I];
D := @D[I];
FBufferIndex := 0
end;
Dec(Size, FBufferSize);
F := FFeedback;
I := 0;
while I < Size do
begin
DoEncode(F, FBuffer, FBufferSize);
XORBuffers(S[I], FBuffer[0], FBufferSize, D[I]);
F := @D[I];
Inc(I, FBufferSize);
end;
if F <> FFeedback then
Move(F^, FFeedback^, FBufferSize);
Dec(Size, I - FBufferSize);
if Size > 0 then
begin
DoEncode(FFeedback, FBuffer, FBufferSize);
XORBuffers(S[I], FBuffer[0], Size, D[I]);
Move(D[I], FFeedback[0], Size);
FBufferIndex := Size;
end;
end;
procedure EncodeOFBx(S,D: PByteArray; Size: Integer);
// OFB-BlockSize
var
I: Integer;
begin
FState := csEncode;
if FBufferIndex > 0 then
begin
I := FBufferSize - FBufferIndex;
if I > Size then I := Size;
XORBuffers(S[0], FFeedback[FBufferIndex], I, D[0]);
Inc(FBufferIndex, I);
if FBufferIndex < FBufferSize then Exit;
Dec(Size, I);
S := @S[I];
D := @D[I];
FBufferIndex := 0
end;
Dec(Size, FBufferSize);
I := 0;
while I < Size do
begin
DoEncode(FFeedback, FFeedback, FBufferSize);
XORBuffers(S[I], FFeedback[0], FBufferSize, D[I]);
Inc(I, FBufferSize);
end;
Dec(Size, I - FBufferSize);
if Size > 0 then
begin
DoEncode(FFeedback, FFeedback, FBufferSize);
XORBuffers(S[I], FFeedback[0], Size, D[I]);
FBufferIndex := Size;
end;
end;
procedure EncodeCFSx(S,D: PByteArray; Size: Integer);
// CFS-BlockSize
var
I: Integer;
begin
FState := csEncode;
if FBufferIndex > 0 then
begin
I := FBufferSize - FBufferIndex;
if I > Size then I := Size;
XORBuffers(S[0], FBuffer[FBufferIndex], I, D[0]);
XORBuffers(D[0], FFeedback[FBufferIndex], I, FFeedback[FBufferIndex]);
Inc(FBufferIndex, I);
if FBufferIndex < FBufferSize then Exit;
Dec(Size, I);
S := @S[I];
D := @D[I];
FBufferIndex := 0
end;
Dec(Size, FBufferSize);
I := 0;
while I < Size do
begin
DoEncode(FFeedback, FBuffer, FBufferSize);
XORBuffers(S[I], FBuffer[0], FBufferSize, D[I]);
XORBuffers(D[I], FFeedback[0], FBufferSize, FFeedback[0]);
Inc(I, FBufferSize);
end;
Dec(Size, I - FBufferSize);
if Size > 0 then
begin
DoEncode(FFeedback, FBuffer, FBufferSize);
XORBuffers(S[I], FBuffer[0], Size, D[I]);
XORBuffers(D[I], FFeedback[0], Size, FFeedback[0]);
FBufferIndex := Size;
end;
end;
procedure EncodeCBCx(S,D: PByteArray; Size: Integer);
var
F: PByteArray;
I: Integer;
begin
Dec(Size, FBufferSize);
F := FFeedback;
I := 0;
while I <= Size do
begin
XORBuffers(S[I], F[0], FBufferSize, D[I]);
F := @D[I];
DoEncode(F, F, FBufferSize);
Inc(I, FBufferSize);
end;
if F <> FFeedback then
Move(F[0], FFeedback[0], FBufferSize);
Dec(Size, I - FBufferSize);
if Size > 0 then
begin // padding
EncodeCFB8(@S[I], @D[I], Size);
FState := csPadded;
end else FState := csEncode;
end;
procedure EncodeCTSx(S,D: PByteArray; Size: Integer);
var
I: Integer;
begin
Dec(Size, FBufferSize);
I := 0;
while I <= Size do
begin
XORBuffers(S[I], FFeedback[0], FBufferSize, D[I]);
DoEncode(@D[I], @D[I], FBufferSize);
XORBuffers(D[I], FFeedback[0], FBufferSize, FFeedback[0]);
Inc(I, FBufferSize);
end;
Dec(Size, I - FBufferSize);
if Size > 0 then
begin // padding
EncodeCFS8(@S[I], @D[I], Size);
FState := csPadded;
end else FState := csEncode;
end;
begin
CheckState([csInitialized, csEncode, csDone]);
case FMode of
cmECBx: EncodeECBx(@Source, @Dest, DataSize);
cmCBCx: EncodeCBCx(@Source, @Dest, DataSize);
cmCTSx: EncodeCTSx(@Source, @Dest, DataSize);
cmCFB8: EncodeCFB8(@Source, @Dest, DataSize);
cmCFBx: EncodeCFBx(@Source, @Dest, DataSize);
cmOFB8: EncodeOFB8(@Source, @Dest, DataSize);
cmOFBx: EncodeOFBx(@Source, @Dest, DataSize);
cmCFS8: EncodeCFS8(@Source, @Dest, DataSize);
cmCFSx: EncodeCFSx(@Source, @Dest, DataSize);
end;
end;
procedure TDECCipher.Decode(const Source; var Dest; DataSize: Integer);
procedure DecodeECBx(S,D: PByteArray; Size: Integer);
var
I: Integer;
begin
if Context.BlockSize = 1 then
begin
DoDecode(S, D, Size);
FState := csDecode;
end else
begin
Dec(Size, FBufferSize);
I := 0;
while I <= Size do
begin
DoDecode(@S[I], @D[I], FBufferSize);
Inc(I, FBufferSize);
end;
Dec(Size, I - FBufferSize);
if Size > 0 then
if Size mod Context.BlockSize = 0 then
begin
DoDecode(@S[I], @D[I], Size);
FState := csDecode;
end else
begin
FState := csPadded;
InvalidMessageLength(Self);
end;
end;
end;
procedure DecodeCFB8(S,D: PByteArray; Size: Integer);
// CFB-8
var
I: Integer;
begin
I := 0;
while I < Size do
begin
DoEncode(FFeedback, FBuffer, FBufferSize);
Move(FFeedback[1], FFeedback[0], FBufferSize -1);
FFeedback[FBufferSize -1] := S[I];
D[I] := S[I] xor FBuffer[0];
Inc(I);
end;
FState := csDecode;
end;
procedure DecodeOFB8(S,D: PByteArray; Size: Integer);
// same as EncodeOFB
var
I: Integer;
begin
I := 0;
while I < Size do
begin
DoEncode(FFeedback, FBuffer, FBufferSize);
Move(FFeedback[1], FFeedback[0], FBufferSize -1);
FFeedback[FBufferSize -1] := FBuffer[0];
D[I] := S[I] xor FBuffer[0];
Inc(I);
end;
FState := csDecode;
end;
procedure DecodeCFS8(S,D: PByteArray; Size: Integer);
var
I: Integer;
begin
I := 0;
while I < Size do
begin
DoEncode(FFeedback, FBuffer, FBufferSize);
Move(FFeedback[1], FFeedback[0], FBufferSize -1);
FFeedback[FBufferSize -1] := FFeedback[FBufferSize -1] xor S[I];
D[I] := S[I] xor FBuffer[0];
Inc(I);
end;
FState := csDecode;
end;