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AES-secured-notepad
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GOTOWE

This commit is contained in:
mikgaw@st.amu.edu.pl 2023-12-05 23:53:17 +01:00
parent 3b1d7039d0
commit ad9b2aa6a9
8 changed files with 127 additions and 190 deletions
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143
app/src/main/java/com/example/bsm_notatnik/Login.java
View File

@ -6,33 +6,26 @@ import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.KeySpec;
import java.util.Base64;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.SecretKeySpec;
public class Login extends AppCompatActivity {
private static final String SHARED_NAME_CREDENTIALS = "Credentials";
EditText editTextEmail, editTextPassword;
Button buttonLogin;
ProgressBar progressBar;
TextView textView;
private static final int MAX_LOGIN_ATTEMPTS = 5;
private static final long LOGIN_LOCKOUT_TIME = 60000;
private int loginAttempts = 0;
private long lastLoginAttemptTime = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
@ -42,70 +35,68 @@ public class Login extends AppCompatActivity {
editTextEmail = findViewById(R.id.username);
editTextPassword = findViewById(R.id.password);
buttonLogin = findViewById(R.id.btn_login);
progressBar = findViewById(R.id.progressBar);
textView = findViewById(R.id.registerNow);
textView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(getApplicationContext(), Register.class);
startActivity(intent);
finish(); // finishes current activity
}
textView.setOnClickListener(view -> {
Intent intent = new Intent(getApplicationContext(), Register.class);
startActivity(intent);
finish(); // finishes current activity
});
buttonLogin.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//progressBar.setVisibility(View.VISIBLE);
String email, hashedEmail, password;
email = String.valueOf(editTextEmail.getText());
hashedEmail = Utility.hashEmail(email);
password = String.valueOf(editTextPassword.getText());
if (TextUtils.isEmpty(email)){
Toast.makeText(Login.this, "Enter email!", Toast.LENGTH_SHORT).show();
return;
}
if (TextUtils.isEmpty(password)){
Toast.makeText(Login.this, "Enter password!", Toast.LENGTH_SHORT).show();
return;
}
if (!checkIfUserExists(hashedEmail)){
Toast.makeText(Login.this, "No such username in database!", Toast.LENGTH_SHORT).show();
editTextPassword.setText("");
return;
}
try {
login(hashedEmail, password);
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException(e);
} catch (InvalidKeySpecException e) {
throw new RuntimeException(e);
}
//progressBar.setVisibility(View.GONE);
buttonLogin.setOnClickListener(view -> {
long currentTime = System.currentTimeMillis();
if (currentTime - lastLoginAttemptTime >= LOGIN_LOCKOUT_TIME) {
loginAttempts = 0;
}
loginAttempts++;
lastLoginAttemptTime = currentTime;
if (loginAttempts > MAX_LOGIN_ATTEMPTS) {
Toast.makeText(Login.this, "Too many login attempts.", Toast.LENGTH_SHORT).show();
return;
}
String email, hashedEmail, password;
email = String.valueOf(editTextEmail.getText());
hashedEmail = Utility.hashEmail(email);
password = String.valueOf(editTextPassword.getText());
if (TextUtils.isEmpty(email)){
Toast.makeText(Login.this, "Enter email!", Toast.LENGTH_SHORT).show();
return;
}
if (TextUtils.isEmpty(password)){
Toast.makeText(Login.this, "Enter password!", Toast.LENGTH_SHORT).show();
return;
}
if (!checkIfUserExists(hashedEmail)){
Toast.makeText(Login.this, "No such username in database!", Toast.LENGTH_SHORT).show();
editTextPassword.setText("");
return;
}
login(hashedEmail, password);
});
}
private boolean checkIfUserExists(String hashedemail){
private boolean checkIfUserExists(String hashedEmail){
SharedPreferences sharedPreferences = getSharedPreferences(SHARED_NAME_CREDENTIALS, MODE_PRIVATE);
return sharedPreferences.contains("user_" + hashedemail);
return sharedPreferences.contains("user_" + hashedEmail);
}
private void login(String hashedemail, String password) throws NoSuchAlgorithmException, InvalidKeySpecException {
private void login(String hashedEmail, String password) {
SharedPreferences sharedPreferences = getSharedPreferences(SHARED_NAME_CREDENTIALS, MODE_PRIVATE);
String passwordHashFromData = sharedPreferences.getString("user_" + hashedemail, "err");
String passwordHashFromData = sharedPreferences.getString("user_" + hashedEmail, "err");
byte[] salt = getSaltForUser(hashedEmail);
byte[] salt = getSaltForUser(hashedemail, false);
String inputPasswordHash = Utility.hashCredential(password, salt, 1000);
String inputPasswordHash = Utility.hashCredential(password, salt);
assert inputPasswordHash != null;
@ -113,8 +104,7 @@ public class Login extends AppCompatActivity {
Toast.makeText(getApplicationContext(), "Login Successful", Toast.LENGTH_SHORT).show();
Intent intent = new Intent(getApplicationContext(), MainActivity.class);
intent.putExtra("CURRENT_USER_EMAIL_HASH", hashedemail);
//intent.putExtra("KEY", getKeyFromPassword(password, getSalt2(hashedemail)));
intent.putExtra("CURRENT_USER_EMAIL_HASH", hashedEmail);
intent.putExtra("PAS", password);
startActivity(intent);
finish();
@ -125,37 +115,10 @@ public class Login extends AppCompatActivity {
}
}
public static SecretKey getKeyFromPassword(String password, String salt) throws NoSuchAlgorithmException, InvalidKeySpecException {
SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256");
KeySpec spec = new PBEKeySpec(password.toCharArray(), salt.getBytes(), 65536, 256);
SecretKey secret = new SecretKeySpec(factory.generateSecret(spec).getEncoded(), "AES");
return secret;
}
private String genKeyHash(String hashedemail, String password){
byte[] salt2 = getSaltForUser(hashedemail, true);
return Utility.hashCredential(password, salt2, 5000);
}
private byte[] getSaltForUser(String hashedEmail, boolean salt2){
private byte[] getSaltForUser(String hashedEmail){
SharedPreferences sharedPreferences = getSharedPreferences(SHARED_NAME_CREDENTIALS, MODE_PRIVATE);
String saltFromData;
if (salt2){
saltFromData = sharedPreferences.getString("salt_2_" + hashedEmail, "err");
}
else {
saltFromData = sharedPreferences.getString("salt_" + hashedEmail, "err");
}
String saltFromData = sharedPreferences.getString("salt_" + hashedEmail, "err");
return Base64.getDecoder().decode(saltFromData);
}
private String getSalt2(String hashedEmail){
SharedPreferences sharedPreferences = getSharedPreferences(SHARED_NAME_CREDENTIALS, MODE_PRIVATE);
return sharedPreferences.getString("salt_2_" + hashedEmail, "err");
}
}

28
app/src/main/java/com/example/bsm_notatnik/MainActivity.java
View File

@ -1,4 +1,5 @@
package com.example.bsm_notatnik;
import android.annotation.SuppressLint;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
@ -106,7 +107,7 @@ public class MainActivity extends AppCompatActivity {
}
if(!validatePassword(newPassword)){
Toast.makeText(MainActivity.this, "Wrong format of new password!", Toast.LENGTH_SHORT).show();
Toast.makeText(MainActivity.this, "New password to weak!", Toast.LENGTH_SHORT).show();
return;
}
@ -160,9 +161,10 @@ public class MainActivity extends AppCompatActivity {
throw new RuntimeException(e);
}
createNoteView(note);
Toast.makeText(MainActivity.this, "Note saved!", Toast.LENGTH_SHORT).show();
}
Toast.makeText(MainActivity.this, "Note saved!", Toast.LENGTH_SHORT).show();
});
builder.setNegativeButton("Cancel", (dialogInterface, i) -> dialogInterface.dismiss());
@ -239,7 +241,7 @@ public class MainActivity extends AppCompatActivity {
private boolean validatePassword(String password){
final String PASSWORD_PATTERN = "^.{6,}$";
final String PASSWORD_PATTERN = "^(?=.*[0-9])(?=.*[A-Z])(.{8,})$";
Pattern pattern = Pattern.compile(PASSWORD_PATTERN);
Matcher matcher = pattern.matcher(password);
@ -254,7 +256,7 @@ public class MainActivity extends AppCompatActivity {
String newSaltString = Base64.getEncoder().encodeToString(newSalt);
editor.putString("salt_" + hashedEmail, newSaltString);
String hashedNewPassword = Utility.hashCredential(newPassword, newSalt, 1000);
String hashedNewPassword = Utility.hashCredential(newPassword, newSalt);
editor.putString("user_" + hashedEmail, hashedNewPassword);
editor.apply();
@ -264,7 +266,7 @@ public class MainActivity extends AppCompatActivity {
private boolean validateOldPassword(String hashedEmail, String oldPassword){
byte[] salt = getSaltForUser(hashedEmail, false);
String hashedOldPassword = Utility.hashCredential(oldPassword, salt, 1000);
String hashedOldPassword = Utility.hashCredential(oldPassword, salt);
String hashedCorrectPassword = gerPasswordHashFromShared(hashedEmail);
assert hashedOldPassword != null;
@ -313,7 +315,7 @@ public class MainActivity extends AppCompatActivity {
for(int i=0; i<noteList.size(); i++){
Note note = noteList.get(i);
editor.putString(i + "_title_" + HASHED_EMAIL, UtilityAES.encrypt("AES/CBC/PKCS5Padding", note.getTitle(), UtilityAES.getKeyFromPassword(PAS, getSaltForUser(HASHED_EMAIL, true)), iv));
editor.putString(i + "_content_" + HASHED_EMAIL, note.getContent());
editor.putString(i + "_content_" + HASHED_EMAIL, UtilityAES.encrypt("AES/CBC/PKCS5Padding", note.getContent(), UtilityAES.getKeyFromPassword(PAS, getSaltForUser(HASHED_EMAIL, true)), iv));
}
@ -335,7 +337,7 @@ public class MainActivity extends AppCompatActivity {
Note note = new Note();
note.setTitle(UtilityAES.decrypt("AES/CBC/PKCS5Padding", title, UtilityAES.getKeyFromPassword(PAS, getSaltForUser(HASHED_EMAIL, true)), iv) );
note.setContent(content);
note.setContent(UtilityAES.decrypt("AES/CBC/PKCS5Padding", content, UtilityAES.getKeyFromPassword(PAS, getSaltForUser(HASHED_EMAIL, true)), iv) );
noteList.add(note);
}
@ -353,8 +355,7 @@ public class MainActivity extends AppCompatActivity {
private String getIVStringFromShared(){
SharedPreferences sharedPreferences = getSharedPreferences(SHARED_NAME_NOTES, MODE_PRIVATE);
String ivString = sharedPreferences.getString("iv_" + HASHED_EMAIL, "err");
return ivString;
return sharedPreferences.getString("iv_" + HASHED_EMAIL, "err");
}
private static IvParameterSpec stringToIv(String ivString) {
@ -369,19 +370,16 @@ public class MainActivity extends AppCompatActivity {
private void createNoteView(final Note note){
View noteView = getLayoutInflater().inflate(R.layout.note_item, null);
@SuppressLint("InflateParams") View noteView = getLayoutInflater().inflate(R.layout.note_item, null);
TextView noteTitleTextView = noteView.findViewById(R.id.noteTitleTextView);
TextView noteContentTextView = noteView.findViewById(R.id.noteContentTextView);
Button deleteNoteDutton = noteView.findViewById(R.id.btnDeleteNote);
Button deleteNoteButton = noteView.findViewById(R.id.btnDeleteNote);
noteTitleTextView.setText(note.getTitle());
noteContentTextView.setText(note.getContent());
deleteNoteDutton.setOnClickListener(view -> showDeleteDialog(note));
deleteNoteButton.setOnClickListener(view -> showDeleteDialog(note));
noteView.setOnLongClickListener(view -> {
showEditNoteDialog(note);

4
app/src/main/java/com/example/bsm_notatnik/Note.java
View File

@ -4,13 +4,11 @@ public class Note {
private String title;
private String content;
private int id;
public Note(){
}
public Note(String title, String content, int id){
public Note(String title, String content){
this.title = title;
this.content = content;
}

126
app/src/main/java/com/example/bsm_notatnik/Register.java
View File

@ -6,10 +6,8 @@ import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
@ -22,10 +20,8 @@ import java.util.regex.Pattern;
public class Register extends AppCompatActivity {
private static final String SHARED_NAME_CREDENTIALS = "Credentials";
EditText editTextEmail, editTextPassword;
Button buttonReg;
ProgressBar progressBar;
TextView loginNowTextView;
@ -38,86 +34,75 @@ public class Register extends AppCompatActivity {
editTextEmail = findViewById(R.id.username);
editTextPassword = findViewById(R.id.password);
buttonReg = findViewById(R.id.btn_register);
progressBar = findViewById(R.id.progressBar);
loginNowTextView = findViewById(R.id.loginNow);
//goes to login page
loginNowTextView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(getApplicationContext(), Login.class);
startActivity(intent);
finish(); // finishes current activity
}
loginNowTextView.setOnClickListener(view -> {
Intent intent = new Intent(getApplicationContext(), Login.class);
startActivity(intent);
finish(); // finishes current activity
});
//when register button is clicked
buttonReg.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//progressBar.setVisibility(View.VISIBLE);
String email, hashedEmail, password, hashedPassword;
buttonReg.setOnClickListener(view -> {
String email, hashedEmail, password, hashedPassword;
email = String.valueOf(editTextEmail.getText());
password = String.valueOf(editTextPassword.getText());
email = String.valueOf(editTextEmail.getText());
password = String.valueOf(editTextPassword.getText());
//checks if email field is not empty
if (TextUtils.isEmpty(email)){
Toast.makeText(Register.this, "Enter email!", Toast.LENGTH_SHORT).show();
return;
}
//checks if password field is not empty
if (TextUtils.isEmpty(password)){
Toast.makeText(Register.this, "Enter password!", Toast.LENGTH_SHORT).show();
return;
}
//checks if email field is not empty
if (TextUtils.isEmpty(email)){
Toast.makeText(Register.this, "Enter email!", Toast.LENGTH_SHORT).show();
return;
}
//checks if password field is not empty
if (TextUtils.isEmpty(password)){
Toast.makeText(Register.this, "Enter password!", Toast.LENGTH_SHORT).show();
return;
}
hashedEmail = Utility.hashEmail(email);
hashedEmail = Utility.hashEmail(email);
//checks if given username is already registered in database
if (checkIfUserExists(hashedEmail)){
editTextEmail.setText("");
editTextPassword.setText("");
Toast.makeText(Register.this, "Account with this username already exists!", Toast.LENGTH_SHORT).show();
return;
}
//checks if email has correct format
if (!validateEmail(email)){
editTextPassword.setText("");
Toast.makeText(Register.this, "Email format not correct!", Toast.LENGTH_SHORT).show();
return;
}
//checks password wymagania
if (!validatePassword(password)){
Toast.makeText(Register.this, "Password to weak!", Toast.LENGTH_SHORT).show();
return;
}
byte[] salt1 = Utility.generateSalt();
byte[] salt2 = Utility.generateSalt();
saveSaltsForUser(hashedEmail, salt1, salt2);
hashedPassword = Utility.hashCredential(password, salt1, 1000);
saveNewUser(hashedEmail, hashedPassword);
Toast.makeText(Register.this, "Konto utworzone z email: " + email + " oraz hasłem: " + password, Toast.LENGTH_SHORT).show();
//checks if given username is already registered in database
if (checkIfUserExists(hashedEmail)){
editTextEmail.setText("");
editTextPassword.setText("");
Toast.makeText(Register.this, "Account with this username already exists!", Toast.LENGTH_SHORT).show();
return;
}
//checks if email has correct format
if (!validateEmail(email)){
editTextPassword.setText("");
Toast.makeText(Register.this, "Email format not correct!", Toast.LENGTH_SHORT).show();
return;
}
//checks password requirements
if (!validatePassword(password)){
Toast.makeText(Register.this, "Password to weak!", Toast.LENGTH_SHORT).show();
return;
}
byte[] salt1 = Utility.generateSalt();
byte[] salt2 = Utility.generateSalt();
saveSaltsForUser(hashedEmail, salt1, salt2);
hashedPassword = Utility.hashCredential(password, salt1);
saveNewUser(hashedEmail, hashedPassword);
Toast.makeText(Register.this, "Created account with email: " + email, Toast.LENGTH_SHORT).show();
editTextEmail.setText("");
editTextPassword.setText("");
});
}
private boolean checkIfUserExists(String hashedemail){
private boolean checkIfUserExists(String hashedEmail){
SharedPreferences sharedPreferences = getSharedPreferences(SHARED_NAME_CREDENTIALS, MODE_PRIVATE);
return sharedPreferences.contains("user_" + hashedemail);
return sharedPreferences.contains("user_" + hashedEmail);
}
private boolean validateEmail(String email){
@ -129,31 +114,30 @@ public class Register extends AppCompatActivity {
}
private boolean validatePassword(String password){
final String PASSWORD_PATTERN = "^.{6,}$";
final String PASSWORD_PATTERN = "^(?=.*[0-9])(?=.*[A-Z])(.{8,})$";
Pattern pattern = Pattern.compile(PASSWORD_PATTERN);
Matcher matcher = pattern.matcher(password);
return matcher.matches();
}
private void saveSaltsForUser(String hashedemail, byte[] salt1, byte[] salt2){
private void saveSaltsForUser(String hashedEmail, byte[] salt1, byte[] salt2){
SharedPreferences sharedPreferences = getSharedPreferences(SHARED_NAME_CREDENTIALS, MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
String salt1String = Base64.getEncoder().encodeToString(salt1);
String salt2String = Base64.getEncoder().encodeToString(salt2);
editor.putString("salt_" + hashedemail, salt1String);
editor.putString("salt_2_" + hashedemail, salt2String);
editor.putString("salt_" + hashedEmail, salt1String);
editor.putString("salt_2_" + hashedEmail, salt2String);
editor.apply();
}
private void saveNewUser(String hashedemail, String password){
private void saveNewUser(String hashedEmail, String password){
SharedPreferences sharedPreferences = getSharedPreferences(SHARED_NAME_CREDENTIALS, MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putString("user_" + hashedemail, password);
editor.putString("user_" + hashedEmail, password);
editor.apply();
}
}

13
app/src/main/java/com/example/bsm_notatnik/Utility.java
View File

@ -25,13 +25,12 @@ public class Utility {
byte[] emailSalt;
emailSalt = getFirst16BytesOfHash(email);
return hashCredential(email, emailSalt, 1000);
return hashCredential(email, emailSalt);
}
protected static String hashCredential(String credential, byte[] salt, int iterations){
int iteratiions = iterations;
protected static String hashCredential(String credential, byte[] salt){
int keyLen = 256;
KeySpec keySpec = new PBEKeySpec(credential.toCharArray(), salt, iteratiions, keyLen);
KeySpec keySpec = new PBEKeySpec(credential.toCharArray(), salt, 1000, keyLen);
try{
SecretKeyFactory secretKeyFactory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256");
SecretKey secretKey = secretKeyFactory.generateSecret(keySpec);
@ -46,21 +45,19 @@ public class Utility {
protected static byte[] getFirst16BytesOfHash(String input){
try {
// Create MessageDigest instance for SHA-256
MessageDigest digest = MessageDigest.getInstance("SHA-256");
// Get the hash value by updating the digest with the input bytes
byte[] hashBytes = digest.digest(input.getBytes(StandardCharsets.UTF_8));
// Truncate the hash to the first 16 bytes
byte[] truncatedHash = new byte[16];
System.arraycopy(hashBytes, 0, truncatedHash, 0, 16);
return truncatedHash;
} catch (NoSuchAlgorithmException e) {
// Handle the exception (e.g., print an error message)
e.printStackTrace();
return null;
}
}
}

1
app/src/main/java/com/example/bsm_notatnik/UtilityAES.java
View File

@ -6,7 +6,6 @@ import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.KeySpec;
import java.util.Arrays;
import java.util.Base64;
import javax.crypto.BadPaddingException;

1
app/src/main/res/layout/create_note_dialog.xml
View File

@ -1,4 +1,3 @@
<!-- password_change_dialog.xml -->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"

1
app/src/main/res/layout/password_change_dialog.xml
View File

@ -1,4 +1,3 @@
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"