Hide_Password_at_console.cpp

#include <termios.h>
#include <unistd.h>
#include <stdio.h>
#include <iostream>
#include <string>
using namespace std;

int getch() {
    int ch;
    struct termios t_old, t_new;
    tcgetattr(STDIN_FILENO, &t_old);
    t_new = t_old;
    t_new.c_lflag &= ~(ICANON | ECHO);
    tcsetattr(STDIN_FILENO, TCSANOW, &t_new);

    ch = getchar();
    tcsetattr(STDIN_FILENO, TCSANOW, &t_old);
    return ch;
}

string getpass(const char *prompt, bool show_asterisk = true) {
  const char BACKSPACE = 127;
  const char RETURN = 10;
  string password;
  unsigned char ch = 0;
  cout << prompt << endl;
  while((ch = getch()) != RETURN) {
       if(ch == BACKSPACE) {
            if(password.length() != 0) {
                 if(show_asterisk)
                 cout << "\b \b";
                 password.resize(password.length() - 1);
              }
         }
       else {
             password += ch;
             if(show_asterisk)
                 cout << '*';
         }
   }
   cout << endl;
   return password;
}


int main() {
  const char *correct_password = "hello_world";
  while (1) {
	  string password = getpass("Please enter the password: ", true); // Show asterisks, false:to show nothing
	  if(password == correct_password) {
	      cout << "Correct password" << endl;
		  break;
	  } else {
	      cout << "Incorrect password. Try again" << endl;
	  }
  }
  return 0;
}