s473620/AES-secured-notepad
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mikgaw@st.amu.edu.pl 2023-12-06 10:58:57 +01:00
parent 0fdff62ef2
commit 1a41a7bdb1
1 changed files with 42 additions and 6 deletions
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48
app/src/main/java/com/example/bsm_notatnik/MainActivity.java
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@ -16,6 +16,7 @@ import android.widget.Toast;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import java.nio.charset.StandardCharsets;
import java.security.GeneralSecurityException;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
@ -312,11 +313,16 @@ public class MainActivity extends AppCompatActivity {
String ivString = ivToString(iv);
saveIvStringToShared(ivString);
//tutaj generuje randomową sól2 używam ją do enkrypcji i zapisuje do skared
byte[] salt2 = Utility.generateSalt();
String salt2String = salt2BytesToString(salt2);
saveSalt2StringToPrefs(salt2String);
editor.putInt("notecount_" + HASHED_EMAIL, noteList.size());
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, UtilityAES.encrypt("AES/CBC/PKCS5Padding", note.getContent(), UtilityAES.getKeyFromPassword(PAS, getSaltForUser(HASHED_EMAIL, true)), iv));
editor.putString(i + "_title_" + HASHED_EMAIL, UtilityAES.encrypt("AES/CBC/PKCS5Padding", note.getTitle(), UtilityAES.getKeyFromPassword(PAS, salt2), iv));
editor.putString(i + "_content_" + HASHED_EMAIL, UtilityAES.encrypt("AES/CBC/PKCS5Padding", note.getContent(), UtilityAES.getKeyFromPassword(PAS, salt2), iv));
}
@ -332,30 +338,60 @@ public class MainActivity extends AppCompatActivity {
String ivString = getIVStringFromShared();
IvParameterSpec iv = stringToIv(ivString);
//tutaj pobieram sól2 z shared i używam do dekrypcji
String saltStringFromShared = getStringSaltFromShared();
byte[] salt2 = stringSalt2toSalt(saltStringFromShared);
for(int i=0; i<noteCount; i++){
String title = sharedPreferences.getString(i + "_title_" + HASHED_EMAIL, "");
String content = sharedPreferences.getString(i + "_content_" + HASHED_EMAIL, "");
Note note = new Note();
note.setTitle(UtilityAES.decrypt("AES/CBC/PKCS5Padding", title, UtilityAES.getKeyFromPassword(PAS, getSaltForUser(HASHED_EMAIL, true)), iv) );
note.setContent(UtilityAES.decrypt("AES/CBC/PKCS5Padding", content, UtilityAES.getKeyFromPassword(PAS, getSaltForUser(HASHED_EMAIL, true)), iv) );
//getSaltForUser(HASHED_EMAIL, true)
note.setTitle(UtilityAES.decrypt("AES/CBC/PKCS5Padding", title, UtilityAES.getKeyFromPassword(PAS, salt2), iv));
note.setContent(UtilityAES.decrypt("AES/CBC/PKCS5Padding", content, UtilityAES.getKeyFromPassword(PAS, salt2), iv));
noteList.add(note);
}
}
private void saveIvStringToShared(String ivString){
private void saveSalt2StringToPrefs(String salt){
SharedPreferences sharedPreferences = getSharedPreferences(SHARED_NAME_NOTES, MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putString("salt_2_" + HASHED_EMAIL, salt);
editor.apply();
}
private String getStringSaltFromShared(){
SharedPreferences sharedPreferences = getSharedPreferences(SHARED_NAME_NOTES, MODE_PRIVATE);
return sharedPreferences.getString("salt_2_" + HASHED_EMAIL, "err");
}
private static byte[] stringSalt2toSalt(String salt2) {
return Base64.getDecoder().decode(salt2);
}
private static String salt2BytesToString(byte[] salt2) {
return Base64.getEncoder().encodeToString(salt2);
}
private void saveIvStringToShared(String ivString){
SharedPreferences sharedPreferences = getSharedPreferences(SHARED_NAME_CREDENTIALS, MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putString("iv_" + HASHED_EMAIL, ivString);
editor.apply();
}
private String getIVStringFromShared(){
SharedPreferences sharedPreferences = getSharedPreferences(SHARED_NAME_NOTES, MODE_PRIVATE);
SharedPreferences sharedPreferences = getSharedPreferences(SHARED_NAME_CREDENTIALS, MODE_PRIVATE);
return sharedPreferences.getString("iv_" + HASHED_EMAIL, "err");
}