[nixon232]

В исходнике он изначально у меня не декриптит.

Код:

function EncryptString(Value: string; Key: string;
  KeyBit: TKeyBit = kb128): string;
var
  SS, DS: TStringStream;
  Size: Int64;
  AESKey128: TAESKey128;
  AESKey192: TAESKey192;
  AESKey256: TAESKey256;
begin
  Result := '';
  SS := TStringStream.Create(Value);
  DS := TStringStream.Create('');
  try
    Size := SS.Size;
    DS.WriteBuffer(Size, SizeOf(Size));
    {  --  128 О»ГЬіЧЧоґуі¤¶ИОЄ 16 ёцЧЦ·ы --  }
    if KeyBit = kb128 then
    begin
      FillChar(AESKey128, SizeOf(AESKey128), 0 );
      Move(PChar(Key)^, AESKey128, Min(SizeOf(AESKey128), Length(Key)));
      EncryptAESStreamECB(SS, 0, AESKey128, DS);
    end;
    {  --  192 О»ГЬіЧЧоґуі¤¶ИОЄ 24 ёцЧЦ·ы --  }
    if KeyBit = kb192 then
    begin
      FillChar(AESKey192, SizeOf(AESKey192), 0 );
      Move(PChar(Key)^, AESKey192, Min(SizeOf(AESKey192), Length(Key)));
      EncryptAESStreamECB(SS, 0, AESKey192, DS);
    end;
    {  --  256 О»ГЬіЧЧоґуі¤¶ИОЄ 32 ёцЧЦ·ы --  }
    if KeyBit = kb256 then
    begin
      FillChar(AESKey256, SizeOf(AESKey256), 0 );
      Move(PChar(Key)^, AESKey256, Min(SizeOf(AESKey256), Length(Key)));
      EncryptAESStreamECB(SS, 0, AESKey256, DS);
    end;
    Result := StrToHex(DS.DataString);
  finally
    SS.Free;
    DS.Free;
  end;
end;

{  --  ЧЦ·ыґ®ЅвГЬєЇКэ Д¬ИП°ґХХ 128 О»ГЬіЧЅвГЬ --  }
function DecryptString(Value: string; Key: string;
  KeyBit: TKeyBit = kb128): string;
var
  SS, DS: TStringStream;
  Size: Int64;
  AESKey128: TAESKey128;
  AESKey192: TAESKey192;
  AESKey256: TAESKey256;
begin
  Result := '';
  SS := TStringStream.Create(HexToStr(Value));
  DS := TStringStream.Create('');
  try
    Size := SS.Size;
    SS.ReadBuffer(Size, SizeOf(Size));
    {  --  128 О»ГЬіЧЧоґуі¤¶ИОЄ 16 ёцЧЦ·ы --  }
    if KeyBit = kb128 then
    begin
      FillChar(AESKey128, SizeOf(AESKey128), 0 );
      Move(PChar(Key)^, AESKey128, Min(SizeOf(AESKey128), Length(Key)));
      DecryptAESStreamECB(SS, SS.Size - SS.Position, AESKey128, DS);
    end;
    {  --  192 О»ГЬіЧЧоґуі¤¶ИОЄ 24 ёцЧЦ·ы --  }
    if KeyBit = kb192 then
    begin
      FillChar(AESKey192, SizeOf(AESKey192), 0 );
      Move(PChar(Key)^, AESKey192, Min(SizeOf(AESKey192), Length(Key)));
      DecryptAESStreamECB(SS, SS.Size - SS.Position, AESKey192, DS);
    end;
    {  --  256 О»ГЬіЧЧоґуі¤¶ИОЄ 32 ёцЧЦ·ы --  }
    if KeyBit = kb256 then
    begin
      FillChar(AESKey256, SizeOf(AESKey256), 0 );
      Move(PChar(Key)^, AESKey256, Min(SizeOf(AESKey256), Length(Key)));
      DecryptAESStreamECB(SS, SS.Size - SS.Position, AESKey256, DS);
    end;
    Result := DS.DataString;
  finally
    SS.Free;
    DS.Free;
  end;
end;

Ну и вызов

Код:

s:=EncryptString('123','abc',kb128);
s1:=DecryptString(s,'abc',kb128);