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| program EncryptDecrypt;
uses crt;
type menu1=array[1..9] of string;
var
fileName, password:string;
isFromFile, isEncrypt:boolean;
count,y:integer;
klav:char;
ch:char;
f_result, f_stroka:string;
s_result, s_stroka:string;
const punkt:array [1..8] of string[40]=('1-Input keyboard','2-List file','3-Cryptя','4-Decryptя',
'5-outputScren',
'6-save file','7-help','8-exid');
{$CODEPAGE CP866}
procedure ZASTAVKA;
var
i:integer;
begin
Window (1,1,80,24);
clrscr;
TEXTCOLOR(5);
for i:=1 to 8 do
begin
GOTOXY(15,i*2);
WRITE(punkt[i]);
end;
end;
function EncryptDecryptSymbol(var symbol:char;password:string; index:integer):char;
var
k:integer;
begin
k:=length(password);
EncryptDecryptSymbol:= chr(ord(symbol) xor ord(password[index mod k]));
end;
function EncryptDecryptStroka(var inputStroka, password:string; flag:boolean):string;
var
i:integer;
result:string;
begin
result:='';
isEncrypt:=flag;
for i:=1 to length(inputStroka) do
begin
result:= concat(result, EncryptDecryptSymbol(inputStroka[i], password, i));
end;
EncryptDecryptStroka:=result;
end;
procedure Inputkeyboard(var stroka:string);
begin
isFromFile:=false;
writeln('input stroku');
readln(s_stroka);
end;
function ListFile(var fileName:string):string;
var
f:text;
ft,st:string;
begin
isFromFile:=true;
ft:='';
st:='';
writeln('input name file');
readln(fileName);
assign(f,fileName);
reset(f);
while (not eof(f)) do
begin
readln(f,st);
ft:=concat(ft, st);
end;
close(f);
ListFile:=ft;
end;
procedure SaveToFile(var ft, fileName: string);
var
f:text;
begin
assign(f, fileName);
rewrite(f);
writeln(f, ft);
close(f);
end;
function Help:string;
var
h:text;
result,t:string;
begin
clrscr;
result:='';
t:='';
assign(h, 'help.txt');
reset(h);
while(not eof(h)) do
begin
readln(h, t);
writeln(t);
end;
close(h);
end;
procedure OutputScreen;
begin
if(not isFromFile) then
begin
if(not isEncrypt) then
writeln(s_stroka)
else
writeln(s_result);
end
else begin
if(not isEncrypt) then
writeln(f_stroka)
else
writeln(f_result);
end;
end;
begin
ZASTAVKA;
repeat
textcolor(13);
GOTOXY(13,Y*2);
write(chr(3));
klav:=readkey;
GOTOXY(13,Y*2);
write(' ');
if ord(klav)=72 then
if y>1 then dec(y)
else y:=8;
if ord(klav)=80 then
if y<8 then inc(y)
else y:=1;
if ord(klav)=27 then
begin
y:=8;
klav:=chr(13);
end;
if (ord(klav)=13) and (y<8) then
begin
clrscr;
textcolor(11);
gotoxy(20,1);
write(punkt[y]);
case y of
1:begin
writeln;
Inputkeyboard(s_stroka);
writeln('');
clrscr;
KLAV:=chr(27);
end;
2:begin
writeln;
f_stroka:='';
f_stroka:=Listfile(fileName);
writeln(f_stroka);
writeln('natusnit probel');
repeat until keypressed;
clrscr;
ZASTAVKA;
KLAV:=chr(27);
end;
3:begin
writeln;
writeln('input parol:');
readln(password);
if(not isFromFile)then
begin
s_result:=EncryptDecryptStroka(s_stroka, password, true);
end
else
f_result:=EncryptDecryptStroka(f_stroka, password, true);
WRITELN('chuvruvanya zavercheno');
writeln('natusnit probel');
clrscr;
ZASTAVKA;
KLAV:=chr(27);
end;
4:begin
writeln;
writeln('ўўҐ¤?вм Ї*а®«м:');
readln(password);
if(not isFromFile)then
begin
s_stroka:=EncryptDecryptStroka(s_result, password, false);
end
else
f_stroka:=EncryptDecryptStroka(f_result, password, false);
WRITELN('rozchuvruvanya zavercheno');
writeln('natusnit probel');
clrscr;
ZASTAVKA;
KLAV:=chr(27);
end;
5:begin
writeln;
writeln('result:');
OutputScreen;
writeln('natusnit probel');
repeat until keypressed;
clrscr;
ZASTAVKA;
KLAV:=chr(27);
end;
6:begin
writeln;
writeln('input name file');
readln(fileName);
if(isEncrypt)then
SaveToFile(f_result, fileName)
else
SaveToFile(f_stroka, fileName);
writeln('natusnit probel');
repeat until keypressed;
clrscr;
ZASTAVKA;
KLAV:=chr(27);
end;
7:begin
clrscr;
writeln;
ZASTAVKA;
writeln(Help);
writeln('natusnit probel');
repeat until keypressed;
clrscr;
KLAV:=chr(27);
end;
8:begin
writeln;
exit;
clrscr;
ZASTAVKA;
KLAV:=chr(27);
end;
end;
end
until (ord(klav)=13) and (y=8);
end. |
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