Daniel's Auth

import java.io.*;
import java.util.*;
import java.security.*;

class User{
	String username;
	String pw;
	String msd_pw;
	static String role;
	
	public User(){
		username = "";
		pw = "";
		msd_pw = "";
		role = "";
	}
	
	public User(String username, String pw, String msd_pw, String role){
		this.username = username;
		this.pw = pw;
		this.msd_pw = msd_pw;
		this.role = role;
	}
}

public class Auth{
	
	public static String pwToMSD(String pw) throws NoSuchAlgorithmException{
		//Copy and paste this section of code
		MessageDigest md = MessageDigest.getInstance("MD5");
		md.update(pw.getBytes());
		byte[] digest = md.digest();
      StringBuffer sb = new StringBuffer();
		for (byte b : digest) {
			sb.append(String.format("%02x", b & 0xff));
		}
		return sb.toString();
	}
	
	public static void main (String []args) throws NoSuchAlgorithmException, IOException{
		int trials = 3;
		Scanner read = new Scanner(System.in);
		User newUser = new User();
		
		while (trials != 0){
			//Ask User for info
			System.out.println("Enter username: \n");
			String g_user = read.nextLine();
			System.out.println("Enter password: \n");
			String g_pw = read.nextLine();
			
			//Convert password to MSD HASH 5
			String msd_pw = pwToMSD(g_pw);
			//System.out.println("MSD: " + msd_pw); for debugging
			
			//open file
			FileInputStream file = new FileInputStream("credential.txt");
			BufferedReader br = new BufferedReader(new InputStreamReader(file));
			
			String line;
			boolean foundUser = false;
			
			while ( (line = br.readLine()) != null){
				
				String[] arr = line.split("\t");
				if (g_user.equals(arr[0]) && msd_pw.equals(arr[1])){
					newUser = new User(g_user, g_pw, msd_pw, arr[3]);
					foundUser = true;
					break;
				}
			}
			if (foundUser){
				System.out.println("You are logged in \n");
				String roleFileToRead = newUser.role + ".txt";
				
				String roleLine;
				String logout = "n";
		
				while (!logout.equals("y")){
					FileInputStream roleFile = new FileInputStream(roleFileToRead);
					BufferedReader roleBr = new BufferedReader(new InputStreamReader(roleFile));
					while ( (roleLine = roleBr.readLine()) != null ){
						System.out.println(roleLine);
					}
					
					System.out.println("Do you want to log out? ");
					logout = read.nextLine();
				}
				
				System.out.println("You are logged out");
				trials = 3;
			}
			else{
				trials--;
				System.out.println("You have " + trials + " trials left");
			}
		}
		
		System.out.println("You are out of trials");
		
	}
}