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Защита информации от несанкционированного доступа (стр. 3 из 4)

DirectionGroup: TRadioGroup;

WayCountEdit: TSpinEdit;

Label4: TLabel;

DescMemo: TMemo;

procedure BitBtn5Click(Sender: TObject);

procedure FormCreate(Sender: TObject);

procedure BitBtn4Click(Sender: TObject);

procedure BitBtn3Click(Sender: TObject);

procedure BitBtn2Click(Sender: TObject);

procedure BitBtn1Click(Sender: TObject);

procedure UsedMethodsBoxClick(Sender: TObject);

procedure DirectionGroupExit(Sender: TObject);

procedure KeyEditExit(Sender: TObject);

procedure WayCountEditExit(Sender: TObject);

procedure EnableKeys(B: Boolean);

procedure FormClose(Sender: TObject; var Action: TCloseAction);

private

{ Private declarations }

public

{ Public declarations }

end;

var

OptionsForm: TOptionsForm;

implementation

{$R *.DFM}

uses CodingUnit, TestUnit;

procedure TOptionsForm.EnableKeys;

begin

DirectionGroup.Enabled:=B;

KeyEdit.Enabled:=B;

WayCountEdit.Enabled:=B;

end;

procedure TOptionsForm.BitBtn5Click(Sender: TObject);

begin

Close;

MainForm.GenerateKey;

end;

procedure TOptionsForm.FormCreate(Sender: TObject);

var i: integer;

begin

for i:=1 to QolMethods do

begin

MethodsBox.Items.Add(Methods[i].MethodName);

Used[i]:=false;

end;

UsedMethodsBox.Clear;

EnableKeys(False);

DescMemo.Clear;

end;

procedure TOptionsForm.BitBtn4Click(Sender: TObject);

var

i: integer;

begin

UsedMethodsBox.Clear;

for i:=1 to QolMethods do Used[i]:=false;

EnableKeys(False);

DescMemo.Clear;

end;

procedure TOptionsForm.BitBtn3Click(Sender: TObject);

begin

If UsedMethodsBox.ItemIndex=-1 then exit;

Used[MethodIndex(UsedMethodsBox.Items.Strings[UsedMethodsBox.ItemIndex])]:=false;

UsedMethodsBox.Items.Delete(UsedMethodsBox.ItemIndex);

If UsedMethodsBox.Items.Count=0 then EnableKeys(False);

DescMemo.Clear;

end;

procedure TOptionsForm.BitBtn2Click(Sender: TObject);

begin

If MethodsBox.ItemIndex=-1 then exit;

if UsedMethodsBox.Items.IndexOf(Methods[MethodsBox.ItemIndex+1].MethodName)=-1 then

begin

UsedMethodsBox.Items.Add(Methods[MethodsBox.ItemIndex+1].MethodName);

Used[MethodsBox.ItemIndex+1]:=true;

EnableKeys(True);

UsedMethodsBox.ItemIndex:=UsedMethodsBox.Items.Count-1;

UsedMethodsBox.OnClick(Self);

end;

end;

procedure TOptionsForm.BitBtn1Click(Sender: TObject);

var i: integer;

begin

UsedMethodsBox.Clear;

for i:=1 to QolMethods do

begin

UsedMethodsBox.Items.Add(Methods[i].MethodName);

Used[i]:=true;

end;

EnableKeys(True);

end;

procedure TOptionsForm.UsedMethodsBoxClick(Sender: TObject);

var

i: integer;

begin

If (UsedMethodsBox.ItemIndex=-1)or

(UsedMethodsBox.Items.Count=0) then

begin

EnableKeys(False);

DescMemo.Clear;

Exit;

end else

begin

EnableKeys(True);

end;

i:=MethodIndex(UsedMethodsBox.Items.Strings[UsedMethodsBox.ItemIndex]);

if i=0 then exit;

DirectionGroup.ItemIndex:=UsedMethods[i].Direction-1;

KeyEdit.MaxLength:=Methods[i].KeyMaxLength;

KeyEdit.Text:=String(UsedMethods[i].Key);

WayCountEdit.Value:=UsedMethods[i].WayCount;

DescMemo.Clear;

DescMemo.Lines.Append(Methods[i].MethodDescription);

end;

procedure TOptionsForm.DirectionGroupExit(Sender: TObject);

var

i: integer;

begin

If (UsedMethodsBox.ItemIndex=-1)or

(UsedMethodsBox.Items.Count=0) then Exit;

i:=MethodIndex(UsedMethodsBox.Items.Strings[UsedMethodsBox.ItemIndex]);

if i=0 then exit;

UsedMethods[i].Direction:=DirectionGroup.ItemIndex+1;

end;

procedure TOptionsForm.KeyEditExit(Sender: TObject);

var

i: integer;

begin

If (UsedMethodsBox.ItemIndex=-1)or

(UsedMethodsBox.Items.Count=0) then

Exit;

i:=MethodIndex(UsedMethodsBox.Items.Strings[UsedMethodsBox.ItemIndex]);

if i=0 then exit;

StrPCopy(UsedMethods[i].Key,KeyEdit.Text);

end;

procedure TOptionsForm.WayCountEditExit(Sender: TObject);

var

i: integer;

begin

If (UsedMethodsBox.ItemIndex=-1)or

(UsedMethodsBox.Items.Count=0) then

Exit;

i:=MethodIndex(UsedMethodsBox.Items.Strings[UsedMethodsBox.ItemIndex]);

if i=0 then exit;

UsedMethods[i].WayCount:=WayCountEdit.Value;

end;

procedure TOptionsForm.FormClose(Sender: TObject;

var Action: TCloseAction);

var

i: integer;

begin

Action:=caHide;

for i:=1 to QolMethods do

begin

if Used[i] then

begin

if StrLen(UsedMethods[i].Key)<Methods[i].KeyMinLength then

begin

ShowMessage(Methods[i].MethodName+': '+Methods[i].KeyMinMessage);

Action:=caNone;

Exit;

end else

if StrLen(UsedMethods[i].Key)>Methods[i].KeyMaxLength then

begin

ShowMessage(Methods[i].MethodName+': '+Methods[i].KeyMaxMessage);

Action:=caNone;

Exit;

end;

end;

end;

end;

end.

unit ProgressUnit;

interface

uses

Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,

ComCtrls, StdCtrls;

type

TProgressForm = class(TForm)

Label1: TLabel;

PBOne: TProgressBar;

PBAll: TProgressBar;

Label2: TLabel;

private

{ Private declarations }

public

Current: integer;

procedure UpdateProgress(fn: String;perc:integer;Cap:String);

procedure InitProgress(qol:integer;Cap:String);

procedure EndProcess;

{ Public declarations }

end;

var

ProgressForm: TProgressForm;

implementation

{$R *.DFM}

procedure TProgressForm.EndProcess;

begin

inc(current);

end;

procedure TProgressForm.UpdateProgress;

begin

ProgressForm.Caption:=Cap+' - '+inttostr(round(PBAll.Position*100/PBAll.Max))+'%';

Label1.Caption:=Cap+fn;

PBOne.Position:=perc;

PBAll.Position:=100*Current+perc;

end;

procedure TProgressForm.InitProgress;

begin

Caption:=Cap;

Label1.Caption:='Подготовка...';

PBOne.Position:=0;

PBOne.Max:=100;

PBAll.Position:=0;

PBAll.Max:=qol*100;

Current:=0;

end;

end.

unit TestUnit;

interface

uses

Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,

StdCtrls, ActnList, ExtCtrls, ComCtrls, ToolWin, Grids, Outline, DirOutln,

Buttons, ShellApi, Registry;

type

TMainForm = class(TForm)

Label1: TLabel;

RecurseBox: TCheckBox;

BitBtn1: TBitBtn;

StaticText1: TStaticText;

MainKey: TEdit;

BitBtn2: TBitBtn;

Open: TOpenDialog;

BitBtn3: TBitBtn;

BitBtn4: TBitBtn;

BitBtn5: TBitBtn;

BitBtn6: TBitBtn;

files: TListBox;

procedure FileDrop(var Msg: TWMDropFiles); message WM_DROPFILES;

procedure AddCmdLine(var msg: TMessage); message WM_USER;

procedure FormCreate(Sender: TObject);

procedure BitBtn1Click(Sender: TObject);

procedure DoCommandLine(S: String);

procedure StopDblClick(Sender: TObject);

procedure GoDblClick(Sender: TObject);

procedure GenerateKey;

function DecodeKey: integer;

procedure BitBtn2Click(Sender: TObject);

procedure BitBtn3Click(Sender: TObject);

procedure BitBtn6Click(Sender: TObject);

private

{ Private declarations }

public

end;

var

MainForm: TMainForm;

Decode: boolean;

implementation

uses CodingUnit, OptionsUnit, ProgressUnit;

{$R *.DFM}

procedure TMainForm.GenerateKey;

var

i,k,l: integer;

s: string;

begin

for i:=1 to QolMethods do

begin

If Used[i] then

begin

k:=random(9)+1;

s:=concat(s,Methods[i].MethodKey);

s:=concat(s,IntToStr(k));

l:=strlen(UsedMethods[i].Key)+k*6;

s:=concat(s,Format('%2d',[l]));

s:=concat(s,StrPas(UsedMethods[i].Key));

s:=concat(s,Format('%2d',[strlen(UsedMethods[i].Key)+k*5+UsedMethods[i].Direction]));

s:=concat(s,Format('%2d',[strlen(UsedMethods[i].Key)+k*4+UsedMethods[i].WayCount]));

end;

end;

for i:=1 to length(s) do if s[i]=' ' then s[i]:='-';

MainKey.Text:=S;

end;

function TMainForm.DecodeKey;

var

i,k,l,t: integer;

s: string;

begin

Result:=0;

s:=MainKey.Text;

for i:=1 to length(s) do if s[i]='-' then s[i]:='0';

try

while s<>'' do

begin

t:=MethodByChar(s[1]);

Used[t]:=true;

delete(s,1,1);

k:=strtoint(copy(s,1,1));

delete(s,1,1);

l:=strtoint(copy(s,1,2))-k*6;

delete(s,1,2);

StrPCopy(UsedMethods[t].Key,copy(s,1,l));

delete(s,1,l);

UsedMethods[t].Direction:=strtoint(copy(s,1,2))-l-k*5;

delete(s,1,2);

UsedMethods[t].WayCount:=strtoint(copy(s,1,2))-l-k*4;

delete(s,1,2);

end;

except

on E:Exception do Result:=1;

end;

end;

Procedure TMainForm.DoCommandLine(S: String);

var

i: integer;

tmp: string;

begin

System.CmdLine:=PChar(S);

tmp:=ParamStr(1);

if CompareText(tmp,'/D')=0 then

begin

// декодирование

Decode:=true;

StaticText1.Caption:='Введите ключ';

MainKey.Color:=clWindow;

MainKey.ReadOnly:=false;

MainKey.Text:='';

if ParamCount>1 then

begin

for i:=2 to ParamCount do

begin

Files.Items.Add(ParamStr(i));

end;

end;

end else

begin

//кодирование

if ParamCount>0 then

for i:=1 to ParamCount do

begin

Files.Items.Add(ParamStr(i));

end;

Decode:=False;

end;

end;

procedure TMainForm.AddCmdLine(var msg: TMessage);

//var

// P: array[0..1024]of char;

begin

// GlobalGetAtomName(msg.WParam,p,1023);

// GlobalDeleteAtom(msg.WParam);

// DoCommandLine(String(P));

end;

procedure TMainForm.FormCreate(Sender: TObject);

begin

Caption:='Кодирование';

DragAcceptFiles(Handle,TRUE);

if Decode then BitBtn1.Enabled:=false;

end;

procedure TMainForm.BitBtn1Click(Sender: TObject);

begin

OptionsForm.ShowModal;

end;

procedure TMainForm.StopDblClick(Sender: TObject);

begin

Close;

end;

procedure ValidateFiles;

var

i,k: integer;

begin

with MainForm.Files do

begin

i:=0;

while i<=Items.Count-2 do

begin

k:=i+1;

while k<=Items.Count-1 do

begin

if CompareText(Items.Strings[i],Items.Strings[k])=0 then

begin

Items.Delete(k);

continue;

end;

inc(k);

end;

inc(i);

end;

end;

end;

procedure TMainForm.FileDrop(var msg:TWMDropFiles);

var

i,count: integer;

p: pchar;

s: string;

attr:LongWord;

begin

msg.Result:=0;

count:=DragQueryFile(Msg.Drop,$ffffffff,nil,0);

getmem(p,1024);

for i:=0 to count-1 do

begin

DragQueryFile(msg.Drop,i,p,1024);

s:=StrPas(p);

attr:=GetFileAttributes(PCHAR(s));

if attr<>$ffffffff then

begin

if (attr and FILE_ATTRIBUTE_DIRECTORY) = 0 then

begin

if Decode then

begin

if Pos('.crf',lowercase(s))<>0 then

files.Items.Add(s);

end else

begin

if Pos('.crf',lowercase(s))=0 then

files.Items.Add(s);

end;

end;

end;

end;

freemem(p,1024);

DragFinish(msg.Drop);

ValidateFiles;

end;

function NoMethods:Boolean;

var

i:integer;

begin

result:=true;

for i:=1 to QolMethods do if used[i] then result:=false;

end;

procedure TMainForm.GoDblClick(Sender: TObject);

var

i: integer;

begin

if files.Items.Count=0 then

begin

ShowMessage('Список файлов пуст');

Exit;

end;

ValidateFiles;

if Decode then

begin

if MainKey.Text='' then begin

ShowMessage('Вы забыли ввести ключ');

exit;

end;

if DecodeKey<>0 then begin

ShowMessage('Введен неправильный ключ');

Exit;

end;

if NoMethods then begin

ShowMessage('Невыбранониодногометода');

Exit;

end;

ProgressForm.InitProgress(files.Items.Count,'Декодирование');

ProgressForm.Show;

for i:=0 to files.items.count-1 do

begin

DoDecoding(files.items.strings[i]);

end;

ProgressForm.Hide;

end else

begin

if NoMethods then begin

ShowMessage('Невыбранониодногометода');

Exit;

end;

ProgressForm.InitProgress(files.Items.Count,'Кодирование');

ProgressForm.Show;

for i:=0 to files.items.count-1 do

begin

DoCoding(files.items.strings[i]);

end;

ProgressForm.Hide;

end;

end;

procedure TMainForm.BitBtn2Click(Sender: TObject);

var

T: TRegistry;

begin

T:=TRegistry.Create;

T.RootKey:=HKEY_LOCAL_MACHINE;

T.OpenKey('&bsol;Software&bsol;Laynik Group&bsol;[LG] Hazard Encrypter 2000',True);

Open.InitialDir:=T.ReadString('Lastpath');

if Open.Execute then

begin

files.Items.AddStrings(Open.files);

validatefiles;

T.WriteString('Lastpath',ExtractFileDir(Open.Files.Strings[Open.Files.Count-1]));

end;

T.Free;

end;

procedure TMainForm.BitBtn3Click(Sender: TObject);

begin

if (files.Items.Count=0) or (files.ItemIndex=-1) then exit;

files.Items.Delete(files.ItemIndex);

end;

procedure TMainForm.BitBtn6Click(Sender: TObject);

begin

files.clear;

end;

end.

unit CodingUnit;

interface

uses Classes,SysUtils,Dialogs,CodingTools,K1,K2,K3,GOST;

Const

PIECE_LENGTH = $FFFF;

// Direction constants

diForward = 1;

diBackward = 0;

// ERROR VALUES

CL_ERROR_EMPTYLINE = -1;

CL_ERROR_NOFILENAME = -2;

function Coding_Kir(Buf: Pointer; Size: LongInt; Param: TCodingParameters): Integer;

function DeCoding_Kir(Buf: Pointer; Size: LongInt; Param: TCodingParameters): Integer;

function DoCoding(S: String): integer;

function DoDecoding(S: String): integer;

function MethodIndex(const S: String):integer;

function MethodByChar(const C: Char):integer;

const

QolMethods = 4;

Methods:array[1..QolMethods] of TCodingFunction =

((MethodName:'ГОСТ 28147-89 (ПЗ)';MethodKey:'G';MethodProc:Coding_GOST;MethodDecProc:Coding_GOST;

KeyMinLength:32;KeyMaxLength:32;KeyMinMessage:'Ключ должен быть длиной 32 символa';KeyMaxMessage:'Ключ должен быть длиной 32 символa';

MethodDescription:'Кодирование по ГОСТ 28147-89 (простая замена)'),

(MethodName:'ГОСТ 28147-89 (Г)';MethodKey:'G';MethodProc:Coding_GOST;MethodDecProc:Coding_GOST;

KeyMinLength:32;KeyMaxLength:32;KeyMinMessage:'Ключ должен быть длиной 32 символa';KeyMaxMessage:'Ключ должен быть длиной 32 символa';

MethodDescription:'Кодирование по ГОСТ 28147-89 (гаммирование)'),

(MethodName:'К1';MethodKey:'K';MethodProc:Coding_K1;MethodDecProc:DeCoding_K1;

KeyMinLength:8;KeyMaxLength:8;KeyMinMessage:'Ключ должен быть длиной 8 символов';KeyMaxMessage:'Ключ должен быть длиной 8 символов';

MethodDescription:'Сумма по модулю два'),

(MethodName:'К2';MethodKey:'L';MethodProc:Coding_K2;MethodDecProc:DeCoding_K2;

KeyMinLength:3;KeyMaxLength:8;KeyMinMessage:'Минимальная длина ключа - 3 символа';KeyMaxMessage:'Ключ должен быть длиной менее 9 символов';

MethodDescription:'Циклический сдвиг'));

UsedMethods:array[1..QolMethods] of TCodingParameters =

((Key:'';WayCount:1;Direction:1),

(Key:'';WayCount:1;Direction:1),

(Key:'';WayCount:1;Direction:1),

(Key:'';WayCount:1;Direction:1));

Used: array[1..QolMethods] of boolean = (false,

false,

false,

false);

implementation

uses TestUnit, ProgressUnit;