fix #24, Unhandled exception after issuing passkey with special characters in prompt

Utils.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Diagnostics;
 
 namespace SteamGuard
 {
@@ -6,55 +7,19 @@ namespace SteamGuard
 	{
 		public static string ReadLineSecure()
 		{
-			string text = "";
-			ConsoleKeyInfo key;
-			int cursorIndex = 0;
-			do
-			{
-				key = Console.ReadKey(true);
-				if (((int)key.Key) >= 65 && ((int)key.Key <= 90))
-				{
-					if (cursorIndex == 0 || cursorIndex == text.Length - 1)
-					{
-						text += key.KeyChar.ToString();
-					}
-					else
-					{
-						text.Insert(cursorIndex, key.KeyChar.ToString());
-					}
-					cursorIndex++;
-				}
-				else if (key.Key == ConsoleKey.Backspace && cursorIndex > 0)
-				{
-					text.Remove(cursorIndex - 1, 1);
-					cursorIndex--;
-				}
-				else if (key.Key == ConsoleKey.RightArrow)
-				{
-					cursorIndex++;
-				}
-				else if (key.Key == ConsoleKey.LeftArrow)
-				{
-					cursorIndex--;
-				}
+			// Have bash handle the password input, because apparently it's impossible in C#,
+			// and we don't need to worry about windows compatibility.
+			string bash_cmd = @"read -s -p ""Password: "" password; echo $password";
+			Process p = new Process();
+			p.StartInfo.UseShellExecute = false;
+			p.StartInfo.FileName = "bash";
+			p.StartInfo.Arguments = string.Format("-c '{0}'", bash_cmd);
+			p.StartInfo.RedirectStandardOutput = true;
+			p.Start();
 
-				if (cursorIndex < 0)
-				{
-					cursorIndex = 0;
-				}
-				else if (text.Length == 0 && cursorIndex > text.Length)
-				{
-					cursorIndex = 0;
-				}
-				else if (text.Length != 0 && cursorIndex >= text.Length)
-				{
-					cursorIndex = text.Length - 1;
-				}
-
-				// For debugging:
-				// Console.Title = string.Format("{0}/{1} - {2} ({3}) - {4}", cursorIndex, text.Length, key.Key.ToString(), (int)key.Key, text);
-			} while (key.Key != ConsoleKey.Enter);
-			return text;
+			p.WaitForExit();
+			Console.WriteLine();
+			return p.StandardOutput.ReadToEnd().Trim();
 		}
 	}
 }