Contributor: JAVIER PEREZ VIGO
{
Here you have an encriptation program based in Xor encription by
bits manipulation
XOR 1101 1001 the origin file
0101 0011 Password Encription
_____________ ^^
1000 1010
XOR 1000 1010 the destination file
0101 0011 Password decryption
-------------- ^^
1101 1001
I recommend you to read the book "Advanced Turbo Pascal: Programming and
Techniques" of Herbert Schildt (1987)
(The book i read)
}
PROGRAM Clave;
{ Por: JAVIER PEREZ-VIGO FDEZ 6/01/1994 }
{ Codifica y descodifica ficheros mediante un XOR }
USES CRT;
VAR
Fuente,Destino: FILE;
Ma,Mo: CHAR;
Buffer: ARRAY[1..2048] of byte;
Leidos,f,a,b,c,d,Largo1,Largo2,Largo3: INTEGER;
ch:char;
Par1,Par2,Par3: STRING;
FUNCTION EXISTE_ARCH(Nombre:STRING):BOOLEAN;
VAR
F:FILE;
OK:BOOLEAN;
BEGIN { Existe_Arch }
Assign (f,Nombre);
{$I-} {Exists file?}
Reset(f);
{$I+}
OK:=IOresult=0;
If Not OK then
Existe_Arch:=False
else
begin
close(f);
existe_Arch:=True;
end; { else }
END; { Existe_Arch }
PROCEDURE MENU;
BEGIN { Menu }
Clrscr;
TextColor(white);
GotoXY( 1, 1);Write('ÉÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ»');
GotoXY( 1, 2);Write('º ÉÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ» º');
GotoXY( 1, 3);Write('º º UTILIDAD DE ENCRIPACION / DESENCRIPTACION º º');
GotoXY( 1, 4);Write('º º Por: Javier P‚rez-Vigo 1993 º º');
GotoXY( 1, 5);Write('º ÈÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍͼ º');
GotoXY( 1, 6);Write('º º');
GotoXY( 1, 7);Write('º ÉÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ» º');
GotoXY( 1, 8);Write('º º ùNombre del archivo a des/encriptar : º º');
{Name of the file to de/encript}
GotoXY(60,8);TextColor(red);Write('? ');
GotoXY(60,8);TextColor(red);Write(Paramstr(1));
TextColor(white);
GotoXY( 1, 9);Write('º º º º');
GotoXY( 1,10);Write('º º ùNombre del archivo des/encriptado : º º');
{Name of the to de/encripted file}
GotoXY(60,10);TextColor(red);Write('? ');
GotoXY(60,10);TextColor(red);Write(paramstr(2));
TextColor(white);
GotoXY( 1,11);Write('º º º º');
GotoXY( 1,12);Write('º º ùClave de encriptaci¢n: º º');
{Password}
GotoXY(60,12);TextColor(red);Write('? ');
GotoXY(60,12);TextColor(red);Write(paramstr(3));
TextColor(white);
GotoXY( 1,13);Write('º º º º');
GotoXY( 1,14);Write('º ÌÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ͹ º');
GotoXY( 1,15);Write('º º º º');
GotoXY( 1,16);Write('º ÈÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍͼ º');
GotoXY( 1,17);Write('º º');
GotoXY( 1,18);Write('º º');
GotoXY( 1,19);Write('º º');
GotoXY( 1,20);Write('º º');
GotoXY( 1,21);Write('º º');
GotoXY( 1,22);Write('ÈÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍͼ');
END;
PROCEDURE FIN;
BEGIN
MENU;
TextColor(YELLOW); {Clave [origin] [destination] [password number] }
GotoXY( 6,17);
WriteLn (' Clave [origen] [destino] [n§ clave]');
TextColor(RED);
GotoXY( 6,18);
WriteLn('=======================================');
TextColor(YELLOW);
GotoXY( 6,19);
WriteLn (' ENCRIPTAR: Clave texto.doc secret.doc 12345');
GotoXY( 6,20);
WriteLn (' DESENCRIPTAR: Clave secret.doc texto.txt 12345');
END;
BEGIN { Programa Principal } {Main}
Clrscr;
Largo1:=LENGTH(Paramstr(1));
Largo2:=LENGTH(Paramstr(2));
Largo3:=LENGTH(Paramstr(3));
If (Largo1 =0) OR (Largo2=0) OR (Largo3=0) then
Begin
Clrscr;
FIN;
Par1:='';Par2:='';Par3:='';
if largo1=0 then Par1:=' ORIGEN,';
if largo2=0 then Par2:=' DESTINO,';
if largo3=0 then Par3:=' CLAVE';
GotoXY(10,15);
TextColor(red);
Write(' Introduzca los par metros : ',PAR1,PAR2,PAR3);
{introduce the parameters}
TextColor(WHITE);
GotoXY(1,24);
Halt(0);
End;
If Paramstr(1)=Paramstr(2) Then
begin;
Fin;
GotoXY(10,15);
TextColor(RED);
Write(' Introduzca distintos ficheros ORIGEN y DESTINO ! ');
TextColor(WHITE);
{origin and destination are the same file}
GotoXY(1,24);
Halt(1);
end;
ASSIGN (FUENTE,PARAMSTR(1));
if existe_arch (paramstr(1)) then
RESET (FUENTE,1)
else
BEGIN
Clrscr;
FIN;
GotoXY(10,15);
TextColor(RED);
Write(' No existe el fichero ORIGEN ! ');
{The origin file don't exist}
TextColor(WHITE);
GotoXY(1,24);
Halt(2);
END;
ASSIGN (DESTINO,PARAMSTR(2));
if existe_arch (paramstr(2)) then
BEGIN
Clrscr;
MENU;
GotoXY(9,18);
TextColor(LightGreen);
Write('El archivo destino < ');
TextColor(LightRed);
{if destination file exist}
Write(PARAMSTR(2));
TextColor(LightGreen);
Write(' > existe');
GotoXY(9,20);
Write('¨ Quiere SOBREESCRIBIRLO ? ');
{rewrite it?}
TextColor(LightRed);
write(' (S/N) ');
TextColor(White);
Ch := ReadKey;
TextColor(White);
if Upcase(Ch) <> 'S' then
begin
Close(fuente);
Clrscr;
FIN;
GotoXY(10,15);
TextColor(Red);
Write(' Escriba un nuevo nombre de fichero DESTINO !');
TextColor(White);
{write a new name for destination file}
GotoXY(1,24);
Halt(3);
end;
END;
ReWrite(DESTINO,1);
VAL(Paramstr(3),RANDSEED,F);
Clrscr;
MENU;
GotoXY(10,15);
TextColor(Blue);
Write('==>');
a:=1;
TextColor(Red);
REPEAT
BlockRead(FUENTE,BUFFER,SIZEOF(BUFFER),LEIDOS);
FOR F:=1 TO LEIDOS DO
Buffer[F] := Buffer[F] XOR RANDOM(255);
TextColor((a div 60)+1);
Write('Þ');
a:=a+1;
if (a mod 60 =0) then GotoXY(13,15);
BlockWrite(DESTINO,BUFFER,LEIDOS);
UNTIL (LEIDOS=0);
CLOSE (FUENTE);
CLOSE (DESTINO);
TextColor(White);
WriteLn;
WriteLn;
WriteLn;
GotoXY(1,24);
Halt(4)
END.