s421824/Zad1SzyfrowanyNotatnik
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Not decrypting correctly

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This commit is contained in:
Wiktor Bałaban 2019-11-12 17:37:30 +01:00
parent 0f9985b279
commit a43e227289
2 changed files with 105 additions and 7 deletions
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25
app/src/main/java/com/example/encryptednotebook/MainActivity.java
View File

@ -18,6 +18,9 @@ import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import java.math.BigInteger;
import java.security.SecureRandom;
public class MainActivity extends AppCompatActivity {
public static final int SET_PASSWORD_REQUEST = 1;
@ -30,8 +33,22 @@ public class MainActivity extends AppCompatActivity {
setSupportActionBar(toolbar);
TextView hello = findViewById(R.id.hello);
hello.setText("Wpisz hasło");
String saltString = PreferenceManager.getDefaultSharedPreferences(getApplicationContext()).getString("SALT", null);
if (saltString == null) {
String randomString = new BigInteger(130, new SecureRandom()).toString(32);
byte[] salt = new byte[8];
try {
System.arraycopy(randomString.getBytes("UTF-8"), 0, salt, 0, 8);
PreferenceManager.getDefaultSharedPreferences(getApplicationContext()).edit().putString("SALT", new String(salt)).apply();
} catch (Exception e) {
e.printStackTrace();
}
}
boolean isPassCreated = PreferenceManager.getDefaultSharedPreferences(getApplicationContext()).getBoolean("PASSWORD_CREATED", false);
if(!isPassCreated){
if (!isPassCreated) {
Intent pickContactIntent = new Intent(this, SetPasswordActivity.class);
startActivityForResult(pickContactIntent, SET_PASSWORD_REQUEST);
}
@ -43,9 +60,11 @@ public class MainActivity extends AppCompatActivity {
EditText password = findViewById(R.id.password);
String passValue = password.getText().toString();
String savedPassValue = PreferenceManager.getDefaultSharedPreferences(getApplicationContext()).getString("PASSWORD", null);
if(passValue.equals(savedPassValue)) {
if (passValue.equals(savedPassValue)) {
Snackbar.make(view, "Dobre hasło", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
Intent intent = new Intent(getApplicationContext(), NotebookActivity.class);
startActivity(intent);
} else {
Snackbar.make(view, "Złe hasło", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
@ -80,7 +99,7 @@ public class MainActivity extends AppCompatActivity {
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == SET_PASSWORD_REQUEST) {
if(resultCode == Activity.RESULT_OK){
if (resultCode == Activity.RESULT_OK) {
Toast.makeText(getApplicationContext(), "Udało się ustawić hasło", Toast.LENGTH_SHORT).show();
}
if (resultCode == Activity.RESULT_CANCELED) {

87
app/src/main/java/com/example/encryptednotebook/NotebookActivity.java
View File

@ -1,5 +1,6 @@
package com.example.encryptednotebook;
import android.content.Intent;
import android.os.Bundle;
import com.google.android.material.floatingactionbutton.FloatingActionButton;
@ -12,6 +13,22 @@ import android.preference.PreferenceManager;
import android.view.View;
import android.widget.EditText;
import java.io.UnsupportedEncodingException;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.InvalidParameterSpecException;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.SecretKeySpec;
public class NotebookActivity extends AppCompatActivity {
@Override
@ -20,19 +37,81 @@ public class NotebookActivity extends AppCompatActivity {
setContentView(R.layout.activity_notebook);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
final EditText text = findViewById(R.id.text);
String savedPassValue = PreferenceManager.getDefaultSharedPreferences(getApplicationContext()).getString("PASSWORD", null);
if (savedPassValue != null) {
try {
SecretKey secretKey = generateKey(savedPassValue);
String encryptedText = PreferenceManager.getDefaultSharedPreferences(getApplicationContext()).getString("TEXT", null);
if (encryptedText != null) {
String noteText = decryptMsg(encryptedText.getBytes(), secretKey);
text.setText(noteText);
} else {
text.setText("Twoja notatka");
}
} catch (Exception e) {
e.printStackTrace();
}
}
FloatingActionButton fab = findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
EditText text = findViewById(R.id.text);
String textValue = text.getText().toString();
PreferenceManager.getDefaultSharedPreferences(getApplicationContext()).edit().putString("TEXT", textValue).apply();
Snackbar.make(view, "Udało się zapisać", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
String savedPassValue = PreferenceManager.getDefaultSharedPreferences(getApplicationContext()).getString("PASSWORD", null);
if (savedPassValue != null) {
try {
SecretKey secretKey = generateKey(savedPassValue);
String encryptedText = new String(encryptMsg(textValue, secretKey));
PreferenceManager.getDefaultSharedPreferences(getApplicationContext()).edit().putString("TEXT", encryptedText).apply();
Snackbar.make(view, "Udało się zapisać", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
} catch (Exception e) {
e.printStackTrace();
}
}
}
});
}
public SecretKey generateKey(String password)
throws NoSuchAlgorithmException, InvalidKeySpecException {
//new PBEKeySpec(password, salt, 10, 128)
String saltString = PreferenceManager.getDefaultSharedPreferences(getApplicationContext()).getString("SALT", null);
byte[] saltBytes;
try {
saltBytes = saltString.getBytes();
} catch (NullPointerException e) {
e.printStackTrace();
saltBytes = "".getBytes();
}
PBEKeySpec keySpec = new PBEKeySpec(password.toCharArray(), saltBytes, 10, 128);
return new SecretKeySpec(SecretKeyFactory.getInstance("PBKDF2WithHmacSHA512").generateSecret(keySpec).getEncoded(), "AES");
}
public byte[] encryptMsg(String message, SecretKey secret)
throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, InvalidParameterSpecException, IllegalBlockSizeException, BadPaddingException, UnsupportedEncodingException {
/* Encrypt the message. */
Cipher cipher = null;
cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, secret);
byte[] cipherText = cipher.doFinal(message.getBytes("UTF-8"));
return cipherText;
}
public String decryptMsg(byte[] cipherText, SecretKey secret)
throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidParameterSpecException, InvalidAlgorithmParameterException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException, UnsupportedEncodingException {
/* Decrypt the message, given derived encContentValues and initialization vector. */
Cipher cipher = null;
cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, secret);
String decryptString = new String(cipher.doFinal(cipherText), "UTF-8");
return decryptString;
}
}