open-keychain/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/dialog/AddSubkeyDialogFragment.java
2016-02-09 00:24:46 +01:00

539 lines
23 KiB
Java

/*
* Copyright (C) 2012-2013 Dominik Schürmann <dominik@dominikschuermann.de>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.sufficientlysecure.keychain.ui.dialog;
import android.annotation.TargetApi;
import android.app.Dialog;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;
import android.support.v4.app.FragmentActivity;
import android.support.v7.app.AlertDialog;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.LayoutInflater;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.DatePicker;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.TableRow;
import android.widget.TextView;
import android.widget.Toast;
import org.bouncycastle.bcpg.sig.KeyFlags;
import org.sufficientlysecure.keychain.R;
import org.sufficientlysecure.keychain.service.SaveKeyringParcel;
import org.sufficientlysecure.keychain.service.SaveKeyringParcel.Algorithm;
import org.sufficientlysecure.keychain.service.SaveKeyringParcel.Curve;
import org.sufficientlysecure.keychain.util.Choice;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Calendar;
import java.util.TimeZone;
public class AddSubkeyDialogFragment extends DialogFragment {
public interface OnAlgorithmSelectedListener {
public void onAlgorithmSelected(SaveKeyringParcel.SubkeyAdd newSubkey);
}
private static final String ARG_WILL_BE_MASTER_KEY = "will_be_master_key";
private OnAlgorithmSelectedListener mAlgorithmSelectedListener;
private CheckBox mNoExpiryCheckBox;
private TableRow mExpiryRow;
private DatePicker mExpiryDatePicker;
private Spinner mAlgorithmSpinner;
private View mKeySizeRow;
private Spinner mKeySizeSpinner;
private View mCurveRow;
private Spinner mCurveSpinner;
private TextView mCustomKeyTextView;
private EditText mCustomKeyEditText;
private TextView mCustomKeyInfoTextView;
private CheckBox mFlagCertify;
private CheckBox mFlagSign;
private CheckBox mFlagEncrypt;
private CheckBox mFlagAuthenticate;
private boolean mWillBeMasterKey;
public void setOnAlgorithmSelectedListener(OnAlgorithmSelectedListener listener) {
mAlgorithmSelectedListener = listener;
}
public static AddSubkeyDialogFragment newInstance(boolean willBeMasterKey) {
AddSubkeyDialogFragment frag = new AddSubkeyDialogFragment();
Bundle args = new Bundle();
args.putBoolean(ARG_WILL_BE_MASTER_KEY, willBeMasterKey);
frag.setArguments(args);
return frag;
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
final FragmentActivity context = getActivity();
final LayoutInflater mInflater;
mWillBeMasterKey = getArguments().getBoolean(ARG_WILL_BE_MASTER_KEY);
mInflater = context.getLayoutInflater();
CustomAlertDialogBuilder dialog = new CustomAlertDialogBuilder(context);
View view = mInflater.inflate(R.layout.add_subkey_dialog, null);
dialog.setView(view);
dialog.setTitle(R.string.title_add_subkey);
mNoExpiryCheckBox = (CheckBox) view.findViewById(R.id.add_subkey_no_expiry);
mExpiryRow = (TableRow) view.findViewById(R.id.add_subkey_expiry_row);
mExpiryDatePicker = (DatePicker) view.findViewById(R.id.add_subkey_expiry_date_picker);
mAlgorithmSpinner = (Spinner) view.findViewById(R.id.add_subkey_algorithm);
mKeySizeSpinner = (Spinner) view.findViewById(R.id.add_subkey_size);
mCurveSpinner = (Spinner) view.findViewById(R.id.add_subkey_curve);
mKeySizeRow = view.findViewById(R.id.add_subkey_row_size);
mCurveRow = view.findViewById(R.id.add_subkey_row_curve);
mCustomKeyTextView = (TextView) view.findViewById(R.id.add_subkey_custom_key_size_label);
mCustomKeyEditText = (EditText) view.findViewById(R.id.add_subkey_custom_key_size_input);
mCustomKeyInfoTextView = (TextView) view.findViewById(R.id.add_subkey_custom_key_size_info);
mFlagCertify = (CheckBox) view.findViewById(R.id.add_subkey_flag_certify);
mFlagSign = (CheckBox) view.findViewById(R.id.add_subkey_flag_sign);
mFlagEncrypt = (CheckBox) view.findViewById(R.id.add_subkey_flag_encrypt);
mFlagAuthenticate = (CheckBox) view.findViewById(R.id.add_subkey_flag_authenticate);
mNoExpiryCheckBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked) {
mExpiryRow.setVisibility(View.GONE);
} else {
mExpiryRow.setVisibility(View.VISIBLE);
}
}
});
// date picker works based on default time zone
Calendar minDateCal = Calendar.getInstance(TimeZone.getDefault());
minDateCal.add(Calendar.DAY_OF_YEAR, 1); // at least one day after creation (today)
mExpiryDatePicker.setMinDate(minDateCal.getTime().getTime());
{
ArrayList<Choice<Algorithm>> choices = new ArrayList<>();
choices.add(new Choice<>(Algorithm.DSA, getResources().getString(
R.string.dsa)));
if (!mWillBeMasterKey) {
choices.add(new Choice<>(Algorithm.ELGAMAL, getResources().getString(
R.string.elgamal)));
}
choices.add(new Choice<>(Algorithm.RSA, getResources().getString(
R.string.rsa)));
choices.add(new Choice<>(Algorithm.ECDSA, getResources().getString(
R.string.ecdsa)));
choices.add(new Choice<>(Algorithm.ECDH, getResources().getString(
R.string.ecdh)));
ArrayAdapter<Choice<Algorithm>> adapter = new ArrayAdapter<>(context,
android.R.layout.simple_spinner_item, choices);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
mAlgorithmSpinner.setAdapter(adapter);
// make RSA the default
for (int i = 0; i < choices.size(); ++i) {
if (choices.get(i).getId() == Algorithm.RSA) {
mAlgorithmSpinner.setSelection(i);
break;
}
}
}
// dynamic ArrayAdapter must be created (instead of ArrayAdapter.getFromResource), because it's content may change
ArrayAdapter<CharSequence> keySizeAdapter = new ArrayAdapter<>(context, android.R.layout.simple_spinner_item,
new ArrayList<CharSequence>(Arrays.asList(getResources().getStringArray(R.array.rsa_key_size_spinner_values))));
keySizeAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
mKeySizeSpinner.setAdapter(keySizeAdapter);
mKeySizeSpinner.setSelection(1); // Default to 4096 for the key length
{
ArrayList<Choice<Curve>> choices = new ArrayList<>();
choices.add(new Choice<>(Curve.NIST_P256, getResources().getString(
R.string.key_curve_nist_p256)));
choices.add(new Choice<>(Curve.NIST_P384, getResources().getString(
R.string.key_curve_nist_p384)));
choices.add(new Choice<>(Curve.NIST_P521, getResources().getString(
R.string.key_curve_nist_p521)));
/* @see SaveKeyringParcel
choices.add(new Choice<Curve>(Curve.BRAINPOOL_P256, getResources().getString(
R.string.key_curve_bp_p256)));
choices.add(new Choice<Curve>(Curve.BRAINPOOL_P384, getResources().getString(
R.string.key_curve_bp_p384)));
choices.add(new Choice<Curve>(Curve.BRAINPOOL_P512, getResources().getString(
R.string.key_curve_bp_p512)));
*/
ArrayAdapter<Choice<Curve>> adapter = new ArrayAdapter<>(context,
android.R.layout.simple_spinner_item, choices);
mCurveSpinner.setAdapter(adapter);
// make NIST P-256 the default
for (int i = 0; i < choices.size(); ++i) {
if (choices.get(i).getId() == Curve.NIST_P256) {
mCurveSpinner.setSelection(i);
break;
}
}
}
dialog.setCancelable(true);
// onClickListener are set in onStart() to override default dismiss behaviour
dialog.setPositiveButton(android.R.string.ok, null);
dialog.setNegativeButton(android.R.string.cancel, null);
final AlertDialog alertDialog = dialog.show();
mCustomKeyEditText.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void afterTextChanged(Editable s) {
setOkButtonAvailability(alertDialog);
}
});
mKeySizeSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
setCustomKeyVisibility();
setOkButtonAvailability(alertDialog);
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
mAlgorithmSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
updateUiForAlgorithm(((Choice<Algorithm>) parent.getSelectedItem()).getId());
setCustomKeyVisibility();
setOkButtonAvailability(alertDialog);
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
return alertDialog;
}
@Override
public void onStart() {
super.onStart(); //super.onStart() is where dialog.show() is actually called on the underlying dialog, so we have to do it after this point
AlertDialog d = (AlertDialog) getDialog();
if (d != null) {
Button positiveButton = d.getButton(Dialog.BUTTON_POSITIVE);
Button negativeButton = d.getButton(Dialog.BUTTON_NEGATIVE);
positiveButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (!mFlagCertify.isChecked() && !mFlagSign.isChecked()
&& !mFlagEncrypt.isChecked() && !mFlagAuthenticate.isChecked()) {
Toast.makeText(getActivity(), R.string.edit_key_select_flag, Toast.LENGTH_LONG).show();
return;
}
Algorithm algorithm = ((Choice<Algorithm>) mAlgorithmSpinner.getSelectedItem()).getId();
Curve curve = null;
Integer keySize = null;
// For EC keys, add a curve
if (algorithm == Algorithm.ECDH || algorithm == Algorithm.ECDSA) {
curve = ((Choice<Curve>) mCurveSpinner.getSelectedItem()).getId();
// Otherwise, get a keysize
} else {
keySize = getProperKeyLength(algorithm, getSelectedKeyLength());
}
int flags = 0;
if (mFlagCertify.isChecked()) {
flags |= KeyFlags.CERTIFY_OTHER;
}
if (mFlagSign.isChecked()) {
flags |= KeyFlags.SIGN_DATA;
}
if (mFlagEncrypt.isChecked()) {
flags |= KeyFlags.ENCRYPT_COMMS | KeyFlags.ENCRYPT_STORAGE;
}
if (mFlagAuthenticate.isChecked()) {
flags |= KeyFlags.AUTHENTICATION;
}
long expiry;
if (mNoExpiryCheckBox.isChecked()) {
expiry = 0L;
} else {
Calendar selectedCal = Calendar.getInstance(TimeZone.getDefault());
//noinspection ResourceType
selectedCal.set(mExpiryDatePicker.getYear(),
mExpiryDatePicker.getMonth(), mExpiryDatePicker.getDayOfMonth());
// date picker uses default time zone, we need to convert to UTC
selectedCal.setTimeZone(TimeZone.getTimeZone("UTC"));
expiry = selectedCal.getTime().getTime() / 1000;
}
SaveKeyringParcel.SubkeyAdd newSubkey = new SaveKeyringParcel.SubkeyAdd(
algorithm, keySize, curve, flags, expiry
);
mAlgorithmSelectedListener.onAlgorithmSelected(newSubkey);
// finally, dismiss the dialogue
dismiss();
}
});
negativeButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dismiss();
}
});
}
}
private int getSelectedKeyLength() {
final String selectedItemString = (String) mKeySizeSpinner.getSelectedItem();
final String customLengthString = getResources().getString(R.string.key_size_custom);
final boolean customSelected = customLengthString.equals(selectedItemString);
String keyLengthString = customSelected ? mCustomKeyEditText.getText().toString() : selectedItemString;
int keySize;
try {
keySize = Integer.parseInt(keyLengthString);
} catch (NumberFormatException e) {
keySize = 0;
}
return keySize;
}
/**
* <h3>RSA</h3>
* <p>for RSA algorithm, key length must be greater than 2048. Possibility to generate keys bigger
* than 8192 bits is currently disabled, because it's almost impossible to generate them on a mobile device (check
* <a href="http://www.javamex.com/tutorials/cryptography/rsa_key_length.shtml">RSA key length plot</a> and
* <a href="http://www.keylength.com/">Cryptographic Key Length Recommendation</a>). Also, key length must be a
* multiplicity of 8.</p>
* <h3>ElGamal</h3>
* <p>For ElGamal algorithm, supported key lengths are 2048, 3072, 4096 or 8192 bits.</p>
* <h3>DSA</h3>
* <p>For DSA algorithm key length must be between 2048 and 3072. Also, it must me dividable by 64.</p>
*
* @return correct key length, according to SpongyCastle specification. Returns <code>-1</code>, if key length is
* inappropriate.
*/
private int getProperKeyLength(Algorithm algorithm, int currentKeyLength) {
final int[] elGamalSupportedLengths = {2048, 3072, 4096, 8192};
int properKeyLength = -1;
switch (algorithm) {
case RSA: {
if (currentKeyLength >= 2048 && currentKeyLength <= 16384) {
properKeyLength = currentKeyLength + ((8 - (currentKeyLength % 8)) % 8);
}
break;
}
case ELGAMAL: {
int[] elGammalKeyDiff = new int[elGamalSupportedLengths.length];
for (int i = 0; i < elGamalSupportedLengths.length; i++) {
elGammalKeyDiff[i] = Math.abs(elGamalSupportedLengths[i] - currentKeyLength);
}
int minimalValue = Integer.MAX_VALUE;
int minimalIndex = -1;
for (int i = 0; i < elGammalKeyDiff.length; i++) {
if (elGammalKeyDiff[i] <= minimalValue) {
minimalValue = elGammalKeyDiff[i];
minimalIndex = i;
}
}
properKeyLength = elGamalSupportedLengths[minimalIndex];
break;
}
case DSA: {
// Bouncy Castle supports 4096 maximum
if (currentKeyLength >= 2048 && currentKeyLength <= 4096) {
properKeyLength = currentKeyLength + ((64 - (currentKeyLength % 64)) % 64);
}
break;
}
}
return properKeyLength;
}
private void setOkButtonAvailability(AlertDialog alertDialog) {
Algorithm algorithm = ((Choice<Algorithm>) mAlgorithmSpinner.getSelectedItem()).getId();
boolean enabled = algorithm == Algorithm.ECDSA || algorithm == Algorithm.ECDH
|| getProperKeyLength(algorithm, getSelectedKeyLength()) > 0;
alertDialog.getButton(AlertDialog.BUTTON_POSITIVE).setEnabled(enabled);
}
private void setCustomKeyVisibility() {
final String selectedItemString = (String) mKeySizeSpinner.getSelectedItem();
final String customLengthString = getResources().getString(R.string.key_size_custom);
final boolean customSelected = customLengthString.equals(selectedItemString);
final int visibility = customSelected ? View.VISIBLE : View.GONE;
mCustomKeyEditText.setVisibility(visibility);
mCustomKeyTextView.setVisibility(visibility);
mCustomKeyInfoTextView.setVisibility(visibility);
// hide keyboard after setting visibility to gone
if (visibility == View.GONE) {
InputMethodManager imm = (InputMethodManager)
getActivity().getSystemService(FragmentActivity.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(mCustomKeyEditText.getWindowToken(), 0);
}
}
private void updateUiForAlgorithm(Algorithm algorithm) {
final ArrayAdapter<CharSequence> keySizeAdapter = (ArrayAdapter<CharSequence>) mKeySizeSpinner.getAdapter();
keySizeAdapter.clear();
switch (algorithm) {
case RSA: {
replaceArrayAdapterContent(keySizeAdapter, R.array.rsa_key_size_spinner_values);
mKeySizeSpinner.setSelection(1);
mKeySizeRow.setVisibility(View.VISIBLE);
mCurveRow.setVisibility(View.GONE);
mCustomKeyInfoTextView.setText(getResources().getString(R.string.key_size_custom_info_rsa));
// allowed flags:
mFlagSign.setEnabled(true);
mFlagEncrypt.setEnabled(true);
mFlagAuthenticate.setEnabled(true);
if (mWillBeMasterKey) {
mFlagCertify.setEnabled(true);
mFlagCertify.setChecked(true);
mFlagSign.setChecked(false);
mFlagEncrypt.setChecked(false);
} else {
mFlagCertify.setEnabled(false);
mFlagCertify.setChecked(false);
mFlagSign.setChecked(true);
mFlagEncrypt.setChecked(true);
}
mFlagAuthenticate.setChecked(false);
break;
}
case ELGAMAL: {
replaceArrayAdapterContent(keySizeAdapter, R.array.elgamal_key_size_spinner_values);
mKeySizeSpinner.setSelection(3);
mKeySizeRow.setVisibility(View.VISIBLE);
mCurveRow.setVisibility(View.GONE);
mCustomKeyInfoTextView.setText(""); // ElGamal does not support custom key length
// allowed flags:
mFlagCertify.setChecked(false);
mFlagCertify.setEnabled(false);
mFlagSign.setChecked(false);
mFlagSign.setEnabled(false);
mFlagEncrypt.setChecked(true);
mFlagEncrypt.setEnabled(true);
mFlagAuthenticate.setChecked(false);
mFlagAuthenticate.setEnabled(false);
break;
}
case DSA: {
replaceArrayAdapterContent(keySizeAdapter, R.array.dsa_key_size_spinner_values);
mKeySizeSpinner.setSelection(2);
mKeySizeRow.setVisibility(View.VISIBLE);
mCurveRow.setVisibility(View.GONE);
mCustomKeyInfoTextView.setText(getResources().getString(R.string.key_size_custom_info_dsa));
// allowed flags:
mFlagCertify.setChecked(false);
mFlagCertify.setEnabled(false);
mFlagSign.setChecked(true);
mFlagSign.setEnabled(true);
mFlagEncrypt.setChecked(false);
mFlagEncrypt.setEnabled(false);
mFlagAuthenticate.setChecked(false);
mFlagAuthenticate.setEnabled(false);
break;
}
case ECDSA: {
mKeySizeRow.setVisibility(View.GONE);
mCurveRow.setVisibility(View.VISIBLE);
mCustomKeyInfoTextView.setText("");
// allowed flags:
mFlagCertify.setEnabled(mWillBeMasterKey);
mFlagCertify.setChecked(mWillBeMasterKey);
mFlagSign.setEnabled(true);
mFlagSign.setChecked(!mWillBeMasterKey);
mFlagEncrypt.setEnabled(false);
mFlagEncrypt.setChecked(false);
mFlagAuthenticate.setEnabled(true);
mFlagAuthenticate.setChecked(false);
break;
}
case ECDH: {
mKeySizeRow.setVisibility(View.GONE);
mCurveRow.setVisibility(View.VISIBLE);
mCustomKeyInfoTextView.setText("");
// allowed flags:
mFlagCertify.setChecked(false);
mFlagCertify.setEnabled(false);
mFlagSign.setChecked(false);
mFlagSign.setEnabled(false);
mFlagEncrypt.setChecked(true);
mFlagEncrypt.setEnabled(true);
mFlagAuthenticate.setChecked(false);
mFlagAuthenticate.setEnabled(false);
break;
}
}
keySizeAdapter.notifyDataSetChanged();
}
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
private void replaceArrayAdapterContent(ArrayAdapter<CharSequence> arrayAdapter, int stringArrayResourceId) {
final String[] spinnerValuesStringArray = getResources().getStringArray(stringArrayResourceId);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
arrayAdapter.addAll(spinnerValuesStringArray);
} else {
for (final String value : spinnerValuesStringArray) {
arrayAdapter.add(value);
}
}
}
}