Android Open Source - android-rackspacecloud Password Manager

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From Project

Back to project page android-rackspacecloud.

License

The source code is released under:

MIT License

Java Source Code

package com.rackspacecloud.android;
//w w  w  .jav a 2s .  c om
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;

import android.content.SharedPreferences;

public class PasswordManager {
  
  private SharedPreferences settings;
  
  public PasswordManager(SharedPreferences sp){
    settings = sp;
  }
  
  /*
   * checks the parameter string against the stored
   * password
   */
  public boolean verifyEnteredPassword(String password) {
    return Arrays.toString(getHash(password)).equals(getStoredPassword());
  }
  
  /*
   * return the hash of the password that is stored in
   * shared preferences
   */
  private String getStoredPassword(){
    return settings.getString(Preferences.PREF_KEY_PASSCODE_HASH, "");
  }
  
  /*
   * turns off password requirement 
   */
  public void turnOffPassword() {
    SharedPreferences.Editor editor = settings.edit();
    editor.putString(Preferences.PREF_KEY_PASSCODE_HASH, "");
    editor.putBoolean(Preferences.PREF_KEY_PASSWORD_LOCK, false);
    editor.commit();
  }
  
  /*
   * submits a password change into memory
   * stores the sha-256 hash of the password
   */
  private void storeNewPassword(String hashedPassword) {
    SharedPreferences.Editor editor = settings.edit();
    editor.putString(Preferences.PREF_KEY_PASSCODE_HASH, hashedPassword);
    editor.putBoolean(Preferences.PREF_KEY_PASSWORD_LOCK, true);
    editor.commit();
  }
  
  /*
   * changes the password for
   */
  public void changePassword(String password) {
    storeNewPassword(Arrays.toString(getHash(password)));
  }
  
  /*
   * returns the sha-256 hash for a given
   * string
   */
  private byte[] getHash(String password) {
    MessageDigest m = null;
    try {
      m = MessageDigest.getInstance("SHA-256");
      m.update(password.getBytes());
    } catch (NoSuchAlgorithmException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    } catch (NullPointerException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
    return m.digest();
  }
  
  /*
   * returns true if their is a password requirement
   */
  public boolean hasPassword() {
    return settings.getBoolean(Preferences.PREF_KEY_PASSWORD_LOCK, false);
  }

}

Java Source Code List

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