Java uygulamasında parolalar oluşturma

Question

Java'da yazılmış bir SQLite veritabanını kullanan bir Android uygulamasına sahibim. Veritabanında saklanan bir MD5 veya SHA1 hash oluşturmak için giriş sayfasındaki parolaları istiyorum. Daha sonra uygulamaya geri giriş yaparken kullanılabilir.

Herhangi biri size herhangi bir yardım sunabilir mi?

Kayıt

package com.example.oliver.beckettreg; 

import android.app.Activity; 
import android.content.Intent; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.EditText; 
import android.widget.Toast; 

public class SignUp extends Activity { 

DatabaseHelper helper = new DatabaseHelper(this); 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.signup); 
} 

//if button clicked 
public void onSignUpClick(View v) { 
    if (v.getId() == R.id.Bsignupbutton) { 


     EditText name = (EditText) findViewById(R.id.TFname); 
     EditText email = (EditText) findViewById(R.id.TFemail); 
     EditText uname = (EditText) findViewById(R.id.TFuname); 
     EditText pass1 = (EditText) findViewById(R.id.TFpass1); 
     EditText pass2 = (EditText) findViewById(R.id.TFpass2); 


     String namestr = name.getText().toString(); 
     String emailstr = email.getText().toString(); 
     String unamestr = uname.getText().toString(); 
     String pass1str = pass1.getText().toString(); 
     String pass2str = pass2.getText().toString(); 

     //check passwords match 
     if(!pass1str.equals(pass2str)) 


     { 
      //popup msg if fails 
      Toast pass = Toast.makeText(SignUp.this , "Passwords don't match!" , Toast.LENGTH_SHORT); 
      pass.show(); 


     } 
     else 
     { 

      //validations for data input 
      if (name.getText().toString().length() == 0) 
      {name.setError("Name Required");} 

      else if (!email.getText().toString().matches("[a-z]{1}\\.[a-z]*[0-9]{4}@student\\.leedsbeckett\\.ac\\.uk")) 
      {email.setError("Incorrect Email Format");} 

      else if (!uname.getText().toString().matches("[cC][0-9]{7}")) 
      {uname.setError("Incorrect ID Format");} 

      else if (!pass1.getText().toString().matches("(?=.*[\\d])(?=.*[a-z])(?=.*[A-Z]).{8,}")) 
      {pass1.setError("Incorrect Password Format");} 

      else{ 
       //insert the details in database 
       Contact c = new Contact(); 
       c.setName(namestr); 
       c.setEmail(emailstr); 
       c.setUname(unamestr); 
       c.setPass(pass1str); 

       helper.insertContact(c); 


       //popup if data passes validations 
       Toast pass = Toast.makeText(SignUp.this , "User Registered" , Toast.LENGTH_LONG); 
       pass.show(); 

      } 

     } 

    } 


} 


public void onButtonClick(View v) { 

    if (v.getId() == R.id.Blogin2) { 
     Intent i = new Intent(SignUp.this, com.example.oliver.beckettreg.MainActivity.class); 
     startActivity(i); 

    } 




} 
} 

Girişi

package com.example.oliver.beckettreg; 

import android.support.v7.app.ActionBarActivity; 
import android.os.Bundle; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.View 
import android.content.Intent; 
import android.widget.EditText; 
import android.widget.Toast; 


public class MainActivity extends ActionBarActivity { 

DatabaseHelper helper = new DatabaseHelper(this); 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
} 


@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.menu_main, menu); 
    return true; 
} 

public void onButtonClick(View v) 
{ 

    //if button clicked 
    if(v.getId() == R.id.Blogin) 
    { 

     //check if passwords match 
     EditText a = (EditText)findViewById(R.id.TFusername); 
     String str = a.getText().toString(); 
     EditText b = (EditText)findViewById(R.id.TFpassword); 
     String pass = b.getText().toString(); 

     String password = helper.searchPass(str); 
     if(pass.equals(password)) 
     { 
      Intent i = new Intent(MainActivity.this, NFC.class); 
      i.putExtra("Username",str); 
      startActivity(i); 
     } 
     else 
     {å 
      Toast temp = Toast.makeText(MainActivity.this , "Username and password don't match!" , Toast.LENGTH_SHORT); 
      temp.show(); 
     } 



    } 
    //sign up button if data passes 
    if(v.getId() == R.id.Bsignup) 
    { 
     Intent i = new Intent(MainActivity.this, com.example.oliver.beckettreg.SignUp.class); 
     startActivity(i); 

    } 

    if(v.getId() == R.id.Bnfc) 
    { 
     Intent i = new Intent(MainActivity.this, com.example.oliver.beckettreg.AttendanceRegistration.class); 
     startActivity(i); 

    } 


} 

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
    // Handle action bar item clicks here. The action bar will 
    // automatically handle clicks on the Home/Up button, so long 
    // as you specify a parent activity in AndroidManifest.xml. 
    int id = item.getItemId(); 

    //noinspection SimplifiableIfStatement 
    if (id == R.id.action_settings) { 
     return true; 
    } 

    return super.onOptionsItemSelected(item); 
} 

}

Veritabanı Yardımcısı

import android.content.ContentValues; 
import android.content.Context; 
import android.database.Cursor; 
import android.database.sqlite.SQLiteDatabase; 
import android.database.sqlite.SQLiteOpenHelper; 
import android.provider.ContactsContract; 



public class 
    DatabaseHelper extends SQLiteOpenHelper { 

//Database Version 
private static final int DATABASE_VERSION = 1; 

//Database Name 
private static final String DATABASE_NAME = "contacts.db"; 

//Table Names 
private static final String REGISTER_TABLE_NAME = "register"; 
private static final String CONTACTS_TABLE_NAME = "contacts"; 

//Contacts Column Names 
private static final String CONTACTS_COLUMN_ID = "id"; 
private static final String CONTACTS_COLUMN_NAME = "name"; 
private static final String CONTACTS_COLUMN_EMAIL = "email"; 
private static final String CONTACTS_COLUMN_UNAME = "uname"; 
private static final String CONTACTS_COLUMN_PASS = "pass"; 

//Register Column Names 
private static final String REGISTER_COLUMN_ID = "id"; 
private static final String REGISTER_COLUMN_SEMINAR = "seminar"; 
private static final String REGISTER_COLUMN_LECTURE = "lecture"; 

SQLiteDatabase db; 

//Table Create Statements 
private static final String CONTACTS_TABLE_CREATE = "create table contacts (id         integer primary key not null , " + 
    "name text not null , email text not null , uname text not null , pass text not null);"; 

private static final String REGISTER_TABLE_CREATE = "create table register   (id integer primary key not null , " + 
    " time DATETIME DEFAULT CURRENT_TIMESTAMP, seminar text not null , lecture text not null, );"; 

public DatabaseHelper(Context context) { 
super(context, DATABASE_NAME, null, DATABASE_VERSION); 
} 

//Creating Required Tables 
@Override 
public void onCreate(SQLiteDatabase db) { 
db.execSQL(REGISTER_TABLE_CREATE); 
db.execSQL(CONTACTS_TABLE_CREATE); 
this.db = db; 
} 

public void insertContact(Contact c) { 
db = this.getWritableDatabase(); 
ContentValues values = new ContentValues(); 

String query = "select * from contacts"; 
Cursor cursor = db.rawQuery(query , null); 
int count = cursor.getCount(); 

values.put(CONTACTS_COLUMN_ID, count); 
values.put(CONTACTS_COLUMN_NAME, c.getName()); 
values.put(CONTACTS_COLUMN_EMAIL, c.getEmail()); 
values.put(CONTACTS_COLUMN_UNAME, c.getUname()); 
values.put(CONTACTS_COLUMN_PASS, c.getPass()); 

db.insert(CONTACTS_TABLE_NAME, null, values); 
db.close(); 


} 

public void insertRegister(Register r) { 
db = this.getWritableDatabase(); 
ContentValues values = new ContentValues(); 

String query = "select * from register"; 
Cursor cursor = db.rawQuery(query, null); 
int count = cursor.getCount(); 

values.put(REGISTER_COLUMN_ID, count); 
values.put(REGISTER_COLUMN_SEMINAR, r.getSeminar()); 
values.put(REGISTER_COLUMN_LECTURE, r.getLecture()); 

db.insert(REGISTER_TABLE_NAME, null, values); 
db.close(); 

} 


public String searchPass(String uname) 
{ 
db = this.getReadableDatabase(); 
String query = "select uname, pass from "+CONTACTS_TABLE_NAME; 
Cursor cursor = db.rawQuery(query , null); 
String a, b; 
b = "not found"; 
if(cursor.moveToFirst()) 
{ 
    do{ 
     a = cursor.getString(0); 

     if(a.equals(uname)) 
     { 
      b = cursor.getString(1); 
      break; 
     } 
    } 
    while(cursor.moveToNext()); 
    } 

return b; 
} 


    //On Upgrade Drop Older Tables 
@Override 
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
    db.execSQL("DROP TABLE IF EXISTS " + REGISTER_TABLE_NAME); 
db.execSQL("DROP TABLE IF EXISTS " + CONTACTS_TABLE_NAME); 

//Create New Tables 
this.onCreate(db); 

} 

} 

Answer 1

Bir dize olarak karma dönecektir bu yöntemi uygulayabilirsiniz.

private String hashMe(String password) { 

    try { 
     MessageDigest md = MessageDigest.getInstance("SHA-1"); //could also be MD5, SHA-256 etc. 
     md.reset(); 
     md.update(password.getBytes("UTF-8")); 
     byte[] resultByte = md.digest(); 
     password = String.format("%01x", new java.math.BigInteger(1, resultByte)); 

    } catch (NoSuchAlgorithmException e) { 
     //do something. 
    } catch (UnsupportedEncodingException ex) { 
     //do something 
    } 
    return password; 
} 

şifreleri ile ilgili olduğundan, karma tuz, ve Db bunları hem tasarruf da gerekir.