323 lines
14 KiB
Java
323 lines
14 KiB
Java
/*
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* Copyright (C) 2012-2013 Dominik Schürmann <dominik@dominikschuermann.de>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.sufficientlysecure.keychain.ui.dialog;
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import android.annotation.TargetApi;
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import android.app.AlertDialog;
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import android.app.Dialog;
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import android.content.DialogInterface;
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import android.os.Build;
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import android.os.Bundle;
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import android.support.v4.app.DialogFragment;
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import android.support.v4.app.FragmentActivity;
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import android.text.Editable;
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import android.text.TextWatcher;
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import android.view.LayoutInflater;
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import android.view.View;
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import android.view.inputmethod.InputMethodManager;
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import android.widget.AdapterView;
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import android.widget.ArrayAdapter;
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import android.widget.EditText;
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import android.widget.Spinner;
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import android.widget.TextView;
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import org.sufficientlysecure.keychain.Constants;
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import org.sufficientlysecure.keychain.R;
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import org.sufficientlysecure.keychain.util.Choice;
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import java.util.ArrayList;
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import java.util.Arrays;
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public class CreateKeyDialogFragment extends DialogFragment {
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public interface OnAlgorithmSelectedListener {
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public void onAlgorithmSelected(Choice algorithmChoice, int keySize);
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}
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private static final String ARG_EDITOR_CHILD_COUNT = "child_count";
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private OnAlgorithmSelectedListener mAlgorithmSelectedListener;
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private Spinner mAlgorithmSpinner;
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private Spinner mKeySizeSpinner;
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private TextView mCustomKeyTextView;
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private EditText mCustomKeyEditText;
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private TextView mCustomKeyInfoTextView;
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public void setOnAlgorithmSelectedListener(OnAlgorithmSelectedListener listener) {
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mAlgorithmSelectedListener = listener;
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}
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public static CreateKeyDialogFragment newInstance(int mEditorChildCount) {
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CreateKeyDialogFragment frag = new CreateKeyDialogFragment();
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Bundle args = new Bundle();
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args.putInt(ARG_EDITOR_CHILD_COUNT, mEditorChildCount);
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frag.setArguments(args);
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return frag;
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}
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@Override
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public Dialog onCreateDialog(Bundle savedInstanceState) {
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final FragmentActivity context = getActivity();
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final LayoutInflater mInflater;
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final int childCount = getArguments().getInt(ARG_EDITOR_CHILD_COUNT);
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mInflater = context.getLayoutInflater();
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CustomAlertDialogBuilder dialog = new CustomAlertDialogBuilder(context);
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View view = mInflater.inflate(R.layout.create_key_dialog, null);
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dialog.setView(view);
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dialog.setTitle(R.string.title_create_key);
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boolean wouldBeMasterKey = (childCount == 0);
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mAlgorithmSpinner = (Spinner) view.findViewById(R.id.create_key_algorithm);
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ArrayList<Choice> choices = new ArrayList<Choice>();
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choices.add(new Choice(Constants.choice.algorithm.dsa, getResources().getString(
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R.string.dsa)));
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if (!wouldBeMasterKey) {
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choices.add(new Choice(Constants.choice.algorithm.elgamal, getResources().getString(
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R.string.elgamal)));
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}
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choices.add(new Choice(Constants.choice.algorithm.rsa, getResources().getString(
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R.string.rsa)));
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ArrayAdapter<Choice> adapter = new ArrayAdapter<Choice>(context,
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android.R.layout.simple_spinner_item, choices);
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adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
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mAlgorithmSpinner.setAdapter(adapter);
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// make RSA the default
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for (int i = 0; i < choices.size(); ++i) {
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if (choices.get(i).getId() == Constants.choice.algorithm.rsa) {
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mAlgorithmSpinner.setSelection(i);
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break;
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}
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}
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mKeySizeSpinner = (Spinner) view.findViewById(R.id.create_key_size);
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// dynamic ArrayAdapter must be created (instead of ArrayAdapter.getFromResource), because it's content may change
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ArrayAdapter<CharSequence> keySizeAdapter = new ArrayAdapter<CharSequence>(context, android.R.layout.simple_spinner_item,
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new ArrayList<CharSequence>(Arrays.asList(getResources().getStringArray(R.array.rsa_key_size_spinner_values))));
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keySizeAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
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mKeySizeSpinner.setAdapter(keySizeAdapter);
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mKeySizeSpinner.setSelection(1); // Default to 4096 for the key length
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mCustomKeyTextView = (TextView) view.findViewById(R.id.custom_key_size_label);
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mCustomKeyEditText = (EditText) view.findViewById(R.id.custom_key_size_input);
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mCustomKeyInfoTextView = (TextView) view.findViewById(R.id.custom_key_size_info);
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dialog.setPositiveButton(android.R.string.ok,
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new DialogInterface.OnClickListener() {
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public void onClick(DialogInterface di, int id) {
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di.dismiss();
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Choice newKeyAlgorithmChoice = (Choice) mAlgorithmSpinner.getSelectedItem();
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int newKeySize = getProperKeyLength(newKeyAlgorithmChoice.getId(), getSelectedKeyLength());
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mAlgorithmSelectedListener.onAlgorithmSelected(newKeyAlgorithmChoice, newKeySize);
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}
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}
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);
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dialog.setCancelable(true);
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dialog.setNegativeButton(android.R.string.cancel,
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new DialogInterface.OnClickListener() {
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public void onClick(DialogInterface di, int id) {
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di.dismiss();
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}
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});
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final AlertDialog alertDialog = dialog.show();
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mCustomKeyEditText.addTextChangedListener(new TextWatcher() {
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@Override
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public void beforeTextChanged(CharSequence s, int start, int count, int after) {
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}
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@Override
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public void onTextChanged(CharSequence s, int start, int before, int count) {
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}
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@Override
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public void afterTextChanged(Editable s) {
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setOkButtonAvailability(alertDialog);
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}
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});
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mKeySizeSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
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@Override
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public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
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setCustomKeyVisibility();
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setOkButtonAvailability(alertDialog);
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}
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@Override
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public void onNothingSelected(AdapterView<?> parent) {
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}
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});
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mAlgorithmSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
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@Override
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public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
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setKeyLengthSpinnerValuesForAlgorithm(((Choice) parent.getSelectedItem()).getId());
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setCustomKeyVisibility();
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setOkButtonAvailability(alertDialog);
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}
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@Override
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public void onNothingSelected(AdapterView<?> parent) {
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}
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});
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return alertDialog;
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}
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private int getSelectedKeyLength() {
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final String selectedItemString = (String) mKeySizeSpinner.getSelectedItem();
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final String customLengthString = getResources().getString(R.string.key_size_custom);
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final boolean customSelected = customLengthString.equals(selectedItemString);
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String keyLengthString = customSelected ? mCustomKeyEditText.getText().toString() : selectedItemString;
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int keySize;
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try {
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keySize = Integer.parseInt(keyLengthString);
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} catch (NumberFormatException e) {
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keySize = 0;
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}
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return keySize;
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}
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/**
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* <h3>RSA</h3>
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* <p>for RSA algorithm, key length must be greater than 1024 (according to
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* <a href="https://github.com/open-keychain/open-keychain/issues/102">#102</a>). Possibility to generate keys bigger
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* than 8192 bits is currently disabled, because it's almost impossible to generate them on a mobile device (check
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* <a href="http://www.javamex.com/tutorials/cryptography/rsa_key_length.shtml">RSA key length plot</a> and
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* <a href="http://www.keylength.com/">Cryptographic Key Length Recommendation</a>). Also, key length must be a
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* multiplicity of 8.</p>
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* <h3>ElGamal</h3>
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* <p>For ElGamal algorithm, supported key lengths are 1536, 2048, 3072, 4096 or 8192 bits.</p>
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* <h3>DSA</h3>
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* <p>For DSA algorithm key length must be between 512 and 1024. Also, it must me dividable by 64.</p>
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*
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* @return correct key length, according to SpongyCastle specification. Returns <code>-1</code>, if key length is
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* inappropriate.
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*/
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private int getProperKeyLength(int algorithmId, int currentKeyLength) {
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final int[] elGamalSupportedLengths = {1536, 2048, 3072, 4096, 8192};
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int properKeyLength = -1;
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switch (algorithmId) {
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case Constants.choice.algorithm.rsa:
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if (currentKeyLength > 1024 && currentKeyLength <= 8192) {
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properKeyLength = currentKeyLength + ((8 - (currentKeyLength % 8)) % 8);
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}
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break;
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case Constants.choice.algorithm.elgamal:
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int[] elGammalKeyDiff = new int[elGamalSupportedLengths.length];
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for (int i = 0; i < elGamalSupportedLengths.length; i++) {
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elGammalKeyDiff[i] = Math.abs(elGamalSupportedLengths[i] - currentKeyLength);
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}
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int minimalValue = Integer.MAX_VALUE;
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int minimalIndex = -1;
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for (int i = 0; i < elGammalKeyDiff.length; i++) {
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if (elGammalKeyDiff[i] <= minimalValue) {
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minimalValue = elGammalKeyDiff[i];
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minimalIndex = i;
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}
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}
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properKeyLength = elGamalSupportedLengths[minimalIndex];
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break;
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case Constants.choice.algorithm.dsa:
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if (currentKeyLength >= 512 && currentKeyLength <= 1024) {
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properKeyLength = currentKeyLength + ((64 - (currentKeyLength % 64)) % 64);
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}
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break;
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}
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return properKeyLength;
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}
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private void setOkButtonAvailability(AlertDialog alertDialog) {
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final Choice selectedAlgorithm = (Choice) mAlgorithmSpinner.getSelectedItem();
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final int selectedKeySize = getSelectedKeyLength(); //Integer.parseInt((String) mKeySizeSpinner.getSelectedItem());
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final int properKeyLength = getProperKeyLength(selectedAlgorithm.getId(), selectedKeySize);
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alertDialog.getButton(AlertDialog.BUTTON_POSITIVE).setEnabled(properKeyLength > 0);
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}
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private void setCustomKeyVisibility() {
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final String selectedItemString = (String) mKeySizeSpinner.getSelectedItem();
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final String customLengthString = getResources().getString(R.string.key_size_custom);
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final boolean customSelected = customLengthString.equals(selectedItemString);
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final int visibility = customSelected ? View.VISIBLE : View.GONE;
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mCustomKeyEditText.setVisibility(visibility);
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mCustomKeyTextView.setVisibility(visibility);
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mCustomKeyInfoTextView.setVisibility(visibility);
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// hide keyboard after setting visibility to gone
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if (visibility == View.GONE) {
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InputMethodManager imm = (InputMethodManager)
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getActivity().getSystemService(getActivity().INPUT_METHOD_SERVICE);
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imm.hideSoftInputFromWindow(mCustomKeyEditText.getWindowToken(), 0);
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}
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}
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private void setKeyLengthSpinnerValuesForAlgorithm(int algorithmId) {
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final ArrayAdapter<CharSequence> keySizeAdapter = (ArrayAdapter<CharSequence>) mKeySizeSpinner.getAdapter();
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final Object selectedItem = mKeySizeSpinner.getSelectedItem();
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keySizeAdapter.clear();
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switch (algorithmId) {
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case Constants.choice.algorithm.rsa:
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replaceArrayAdapterContent(keySizeAdapter, R.array.rsa_key_size_spinner_values);
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mCustomKeyInfoTextView.setText(getResources().getString(R.string.key_size_custom_info_rsa));
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break;
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case Constants.choice.algorithm.elgamal:
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replaceArrayAdapterContent(keySizeAdapter, R.array.elgamal_key_size_spinner_values);
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mCustomKeyInfoTextView.setText(""); // ElGamal does not support custom key length
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break;
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case Constants.choice.algorithm.dsa:
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replaceArrayAdapterContent(keySizeAdapter, R.array.dsa_key_size_spinner_values);
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mCustomKeyInfoTextView.setText(getResources().getString(R.string.key_size_custom_info_dsa));
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break;
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}
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keySizeAdapter.notifyDataSetChanged();
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// when switching algorithm, try to select same key length as before
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for (int i = 0; i < keySizeAdapter.getCount(); i++) {
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if (selectedItem.equals(keySizeAdapter.getItem(i))) {
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mKeySizeSpinner.setSelection(i);
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break;
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}
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}
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}
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@TargetApi(Build.VERSION_CODES.HONEYCOMB)
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private void replaceArrayAdapterContent(ArrayAdapter<CharSequence> arrayAdapter, int stringArrayResourceId) {
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final String[] spinnerValuesStringArray = getResources().getStringArray(stringArrayResourceId);
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if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
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arrayAdapter.addAll(spinnerValuesStringArray);
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} else {
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for (final String value : spinnerValuesStringArray) {
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arrayAdapter.add(value);
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}
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}
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}
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}
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