How Can I Read Passwords from Standard Input Without Echoing Them?

Reading Passwords from std::cin without Echoing

The need to read passwords from standard input without echoing the input characters arises regularly. To achieve this, it's essential to disable the echo on std::cin.

Windows and UNIX Differences

The method for disabling echo depends on the operating system. In Windows, the GetConsoleMode and SetConsoleMode functions are used, while in UNIX-like systems, tcgetattr and tcsetattr are employed.

Implementing the Solution

The provided code snippet includes an OS-agnostic function, SetStdinEcho, which allows toggling echo for std::cin. A sample usage is also provided, demonstrating how to read a password without echoing and then echo it when the user presses enter:

#include <iostream>
#include <string>

int main()
{
    SetStdinEcho(false);

    std::string password;
    std::cin >> password;

    SetStdinEcho(true);

    std::cout << password << std::endl;

    return 0;
}

This code ensures the user's password remains private while being entered and displayed upon successful input.

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