CODEWITHSUNDEEP
c++c
Ali Nouman
Ali Nouman

Reputation: 3414

program to implement password security in c languge?

Any idea how to get like this feature in c or c++

password= ********

but at the end system gets right password(means real input) but other people see this.

Upvotes: 2

Views: 806

Answers (4)

Pradeep
Pradeep

Reputation: 1264

For implementing without using library, you can use getch to get pressed character and print * for any character got from getch and use any key for for escape (here I use Enter).

Sample code 

  while(true) {
       ch = getch();
     if(ch== 13)   // ASCII Code for Enter Key 
         break;
     cout<<"*";
  }

Upvotes: 1

plan9assembler
plan9assembler

Reputation: 2984

turn off echo

http://www.cplusplus.com/forum/general/12256/

windows

#include <windows.h>

void echo( bool on = true )
  {
  DWORD  mode;
  HANDLE hConIn = GetStdHandle( STD_INPUT_HANDLE );
  GetConsoleMode( hConIn, &mode );
  mode = on
       ? (mode |   ENABLE_ECHO_INPUT )
       : (mode & ~(ENABLE_ECHO_INPUT));
  SetConsoleMode( hConIn, mode );
  }

posix

#include <termios.h>
#include <unistd.h>

void echo( bool on = true )
  {
  struct termios settings;
  tcgetattr( STDIN_FILENO, &settings );
  settings.c_lflag = on
                   ? (settings.c_lflag |   ECHO )
                   : (settings.c_lflag & ~(ECHO));
  tcsetattr( STDIN_FILENO, TCSANOW, &settings );
  }

Upvotes: 0

phihag
phihag

Reputation: 288140

To confirm the password of a user, use pam (the official page is hosted on kernel.org and therefore down as of writing), in particular pam_authenticate.

If your application has its own authentication architecture (and most of the time, it shouldn't), execute stty -echo, ask for the password, and then execute stty echo to restore the original behavior.

Upvotes: 3

Roland Illig
Roland Illig

Reputation: 41676

You need to tell the terminal that it suppresses the echo during the input. Maybe your operating system already provides a function that reads a password from the terminal. It might be called getpassword or getpass or getpasswd.

See the command stty to get an overview of the terminal options.

Upvotes: 2

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