Legacy Documentation: Version 4.2
GUI.PasswordField
static function PasswordField(position: Rect, password: string, maskChar: char): string;
static string PasswordField(Rect position, string password, char maskChar);
static def PasswordField(position as Rect, password as string, maskChar as char) as string
static function PasswordField(position: Rect, password: string, maskChar: char, maxLength: int): string;
static string PasswordField(Rect position, string password, char maskChar, int maxLength);
static def PasswordField(position as Rect, password as string, maskChar as char, maxLength as int) as string
static function PasswordField(position: Rect, password: string, maskChar: char, style: GUIStyle): string;
static string PasswordField(Rect position, string password, char maskChar, GUIStyle style);
static def PasswordField(position as Rect, password as string, maskChar as char, style as GUIStyle) as string
static function PasswordField(position: Rect, password: string, maskChar: char, maxLength: int, style: GUIStyle): string;
static string PasswordField(Rect position, string password, char maskChar, int maxLength, GUIStyle style);
static def PasswordField(position as Rect, password as string, maskChar as char, maxLength as int, style as GUIStyle) as string
Parameters

position Rectangle on the screen to use for the text field.
password Password to edit. The return value of this function should be assigned back to the string as shown in the example.
maskChar Character to mask the password with.
maxLength The maximum length of the string. If left out, the user can type for ever and ever.
style The style to use. If left out, the textField style from the current GUISkin is used.
Returns
string The edited password.
Description

Make a text field where the user can enter a password.

	var passwordToEdit : String = "My Password";
	function OnGUI () {
		// Make a password field that modifies passwordToEdit.
		passwordToEdit = GUI.PasswordField (Rect (10, 10, 200, 20), passwordToEdit, "*"[0], 25);
	}

using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour {
    public string passwordToEdit = "My Password";
    void OnGUI() {
        passwordToEdit = GUI.PasswordField(new Rect(10, 10, 200, 20), passwordToEdit, "*"[0], 25);
    }
}

import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	public passwordToEdit as string = 'My Password'

	def OnGUI() as void:
		passwordToEdit = GUI.PasswordField(Rect(10, 10, 200, 20), passwordToEdit, '*'[0], 25)