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| procedure DLL_TceCrypto.InitDecVars(aSymCypher, aChainIds : integer; var ACipherClass : TDECCipherClass; var ACipherMode : TCipherMode; var AHashClass : TDECHashClass; var ATextFormat: TDECFormatClass; var AKDFIndex : LongWord); begin AHashClass := THash_Whirlpool; ATextFormat := TFormat_Mime64; AKDFIndex := 1;
case aSymCypher of 0 : ACipherClass := TCipher_Blowfish; 1 : ACipherClass := TCipher_Twofish; 2 : ACipherClass := TCipher_IDEA; 3 : ACipherClass := TCipher_Cast256; 4 : ACipherClass := TCipher_Mars; 5 : ACipherClass := TCipher_RC4; 6 : ACipherClass := TCipher_RC6; 7 : ACipherClass := TCipher_Rijndael; 8 : ACipherClass := TCipher_Square; 9 : ACipherClass := TCipher_SCOP; 10 : ACipherClass := TCipher_Sapphire; 11 : ACipherClass := TCipher_1DES; 12 : ACipherClass := TCipher_2DES; 13 : ACipherClass := TCipher_3DES; 14 : ACipherClass := TCipher_2DDES; 15 : ACipherClass := TCipher_3DDES; 16 : ACipherClass := TCipher_3TDES; 17 : ACipherClass := TCipher_3Way; 18 : ACipherClass := TCipher_Cast128; 19 : ACipherClass := TCipher_Gost; 20 : ACipherClass := TCipher_Misty; 21 : ACipherClass := TCipher_NewDES; 22 : ACipherClass := TCipher_Q128; 23 : ACipherClass := TCipher_RC2; 24 : ACipherClass := TCipher_RC5; 25 : ACipherClass := TCipher_SAFER; 26 : ACipherClass := TCipher_Shark; 27 : ACipherClass := TCipher_Skipjack; 28 : ACipherClass := TCipher_TEA; 29 : ACipherClass := TCipher_TEAN; else aCipherClass := TCipher_Rijndael; end;
case aChainIds of 0 : ACipherMode := TCipherMode.cmCTSx; 1 : ACipherMode := TCipherMode.cmCBCx; 2 : ACipherMode := TCipherMode.cmCFB8; 3 : ACipherMode := TCipherMode.cmCFBx; 4 : ACipherMode := TCipherMode.cmOFB8; 5 : ACipherMode := TCipherMode.cmOFBx; 6 : ACipherMode := TCipherMode.cmCFS8; 7 : ACipherMode := TCipherMode.cmCFSx; 8 : ACipherMode := TCipherMode.cmECBx; else ACipherMode := cmCBCx; end;
end;
function DLL_TceCrypto.DECEncrypt(const aText: String; const aPassword: String; const aSymCypher : integer = 0; const aChainIds : integer = 0): String; var ASalt: Binary; AData: Binary; APass: Binary; ACipherClass: TDECCipherClass; ACipherMode: TCipherMode; AHashClass: TDECHashClass; ATextFormat: TDECFormatClass; AKDFIndex: LongWord; begin InitDecVars(aSymCypher, aChainIds, ACipherClass, ACipherMode, AHashClass, ATextFormat, AKDFIndex); with ValidCipher(ACipherClass).Create, Context do try ASalt := RandomBinary(16); APass := ValidHash(aHashClass).KDFx(APassword[1], Length(APassword) * SizeOf(APassword[1]), ASalt[1], Length(ASalt), KeySize, TFormat_Copy, AKDFIndex); Mode := ACipherMode; Init(APass); SetLength(AData, Length(AText) * SizeOf(AText[1])); Encode(AText[1], AData[1], Length(AData)); Result := ValidFormat(aTextFormat).Encode(aSalt + aData + CalcMAC); finally Free; ProtectBinary(ASalt); ProtectBinary(AData); ProtectBinary(APass); end; end;
function DLL_TceCrypto.DECEncrypt(const AText: WideString; const APassword: WideString; const aSymCypher : integer = 0; const aChainIds : integer = 0): WideString; var ASalt: Binary; AData: Binary; APass: Binary; ACipherClass: TDECCipherClass; ACipherMode: TCipherMode; AHashClass: TDECHashClass; ATextFormat: TDECFormatClass; AKDFIndex: LongWord; begin InitDecVars(aSymCypher, aChainIds, ACipherClass, ACipherMode, AHashClass, ATextFormat, AKDFIndex); with ValidCipher(ACipherClass).Create, Context do try ASalt := RandomBinary(16); APass := ValidHash(AHashClass).KDFx(APassword[1], Length(APassword) * SizeOf(APassword[1]), ASalt[1], Length(ASalt), KeySize, TFormat_Copy, AKDFIndex); Mode := ACipherMode; Init(APass); SetLength(AData, Length(AText) * SizeOf(AText[1])); Encode(AText[1], AData[1], Length(AData)); Result := ValidFormat(ATextFormat).Encode(ASalt + AData + CalcMAC); finally Free; ProtectBinary(ASalt); ProtectBinary(AData); ProtectBinary(APass); end; end;
function DLL_TceCrypto.DECDecrypt(const aText: String; const aPassword: String; const aSymCypher : integer = 0; const aChainIds : integer = 0): String; var ASalt: Binary; AData: Binary; ACheck: Binary; APass: Binary; ALen: Integer; ACipherClass: TDECCipherClass; ACipherMode: TCipherMode; AHashClass: TDECHashClass; ATextFormat: TDECFormatClass; AKDFIndex: LongWord; begin InitDecVars(aSymCypher, aChainIds, ACipherClass, ACipherMode, AHashClass, ATextFormat, AKDFIndex); with ValidCipher(ACipherClass).Create, Context do try ASalt := ValidFormat(ATextFormat).Decode(AText); ALen := Length(ASalt) - 16 - BufferSize; AData := System.Copy(ASalt, 17, ALen); ACheck := System.Copy(ASalt, ALen + 17, BufferSize); SetLength(ASalt, 16); APass := ValidHash(AHashClass).KDFx(APassword[1], Length(APassword) * SizeOf(APassword[1]), ASalt[1], Length(ASalt), KeySize, TFormat_Copy, AKDFIndex); Mode := ACipherMode; Init(APass); SetLength(Result, ALen div SizeOf(AText[1])); Decode(AData[1], Result[1], ALen); if ACheck <> CalcMAC then raise Exception.Create('Invalid data'); finally Free; ProtectBinary(ASalt); ProtectBinary(AData); ProtectBinary(ACheck); ProtectBinary(APass); end; end;
function DLL_TceCrypto.DECDecrypt(const AText: WideString; const APassword: WideString; const aSymCypher : integer = 0; const aChainIds : integer = 0): WideString; var ASalt: Binary; AData: Binary; ACheck: Binary; APass: Binary; ALen: Integer; ACipherClass: TDECCipherClass; ACipherMode: TCipherMode; AHashClass: TDECHashClass; ATextFormat: TDECFormatClass; AKDFIndex: LongWord; begin InitDecVars(aSymCypher, aChainIds, ACipherClass, ACipherMode, AHashClass, ATextFormat, AKDFIndex); with ValidCipher(ACipherClass).Create, Context do try ASalt := ValidFormat(ATextFormat).Decode(AText); ALen := Length(ASalt) - 16 - BufferSize; AData := System.Copy(ASalt, 17, ALen); ACheck := System.Copy(ASalt, ALen + 17, BufferSize); SetLength(ASalt, 16); APass := ValidHash(AHashClass).KDFx(APassword[1], Length(APassword) * SizeOf(APassword[1]), ASalt[1], Length(ASalt), KeySize, TFormat_Copy, AKDFIndex); Mode := ACipherMode; Init(APass); SetLength(Result, ALen div SizeOf(AText[1])); Decode(AData[1], Result[1], ALen); if ACheck <> CalcMAC then raise Exception.Create('Invalid data'); finally Free; ProtectBinary(ASalt); ProtectBinary(AData); ProtectBinary(ACheck); ProtectBinary(APass); end; end;
function DLL_TceCrypto.DECRegister() : boolean; begin try TFormat_Copy.register; TFormat_HEX.register; TFormat_MIME64.register; TFormat_MIME32.register;
THash_SHA512.register; THash_Whirlpool.register;
TCipher_Blowfish.register; TCipher_Twofish.register; TCipher_IDEA.Register; TCipher_Cast256.Register; TCipher_Mars.Register; TCipher_RC4.Register; TCipher_RC6.Register; TCipher_Rijndael.Register; TCipher_Square.Register; TCipher_SCOP.Register; TCipher_Sapphire.Register; TCipher_1DES.Register; TCipher_2DES.Register; TCipher_3DES.Register; TCipher_2DDES.Register; TCipher_3DDES.Register; TCipher_3TDES.Register; TCipher_3Way.Register; TCipher_Cast128.Register; TCipher_Gost.Register; TCipher_Misty.Register; TCipher_NewDES.Register; TCipher_Q128.Register; TCipher_RC2.Register; TCipher_RC5.Register; TCipher_SAFER.Register; TCipher_Shark.Register; TCipher_Skipjack.Register; TCipher_TEA.Register; TCipher_TEAN.Register;
SetDefaultCipherClass(TCipher_Rijndael); SetDefaultHashClass(THash_SHA512);
result := true; except on exception do result := false; end; end; |