diff options
Diffstat (limited to 'OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/dialog/AddSubkeyDialogFragment.java')
| -rw-r--r-- | OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/dialog/AddSubkeyDialogFragment.java | 392 |
1 files changed, 392 insertions, 0 deletions
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/dialog/AddSubkeyDialogFragment.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/dialog/AddSubkeyDialogFragment.java new file mode 100644 index 000000000..cb31978e9 --- /dev/null +++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/dialog/AddSubkeyDialogFragment.java @@ -0,0 +1,392 @@ +/* + * 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.AlertDialog; +import android.app.Dialog; +import android.content.DialogInterface; +import android.os.Build; +import android.os.Bundle; +import android.support.v4.app.DialogFragment; +import android.support.v4.app.FragmentActivity; +import android.text.Editable; +import android.text.TextWatcher; +import android.text.format.DateUtils; +import android.view.LayoutInflater; +import android.view.View; +import android.view.inputmethod.InputMethodManager; +import android.widget.AdapterView; +import android.widget.ArrayAdapter; +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 org.spongycastle.bcpg.PublicKeyAlgorithmTags; +import org.spongycastle.bcpg.sig.KeyFlags; +import org.sufficientlysecure.keychain.R; +import org.sufficientlysecure.keychain.service.SaveKeyringParcel; +import org.sufficientlysecure.keychain.util.Choice; + +import java.util.ArrayList; +import java.util.Arrays; +import java.util.Calendar; +import java.util.Date; +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 Spinner mKeySizeSpinner; + private TextView mCustomKeyTextView; + private EditText mCustomKeyEditText; + private TextView mCustomKeyInfoTextView; + private CheckBox mFlagCertify; + private CheckBox mFlagSign; + private CheckBox mFlagEncrypt; + private CheckBox mFlagAuthenticate; + + 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; + + final boolean willBeMasterKey = 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); + 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); + } + } + }); + + if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.HONEYCOMB) { + mExpiryDatePicker.setMinDate(new Date().getTime() + DateUtils.DAY_IN_MILLIS); + } + + ArrayList<Choice> choices = new ArrayList<Choice>(); + choices.add(new Choice(PublicKeyAlgorithmTags.DSA, getResources().getString( + R.string.dsa))); + if (!willBeMasterKey) { + choices.add(new Choice(PublicKeyAlgorithmTags.ELGAMAL_ENCRYPT, getResources().getString( + R.string.elgamal))); + } + choices.add(new Choice(PublicKeyAlgorithmTags.RSA_GENERAL, getResources().getString( + R.string.rsa))); + ArrayAdapter<Choice> adapter = new ArrayAdapter<Choice>(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() == PublicKeyAlgorithmTags.RSA_GENERAL) { + mAlgorithmSpinner.setSelection(i); + break; + } + } + + // dynamic ArrayAdapter must be created (instead of ArrayAdapter.getFromResource), because it's content may change + ArrayAdapter<CharSequence> keySizeAdapter = new ArrayAdapter<CharSequence>(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 + + + dialog.setPositiveButton(android.R.string.ok, + new DialogInterface.OnClickListener() { + public void onClick(DialogInterface di, int id) { + di.dismiss(); + Choice newKeyAlgorithmChoice = (Choice) mAlgorithmSpinner.getSelectedItem(); + int newKeySize = getProperKeyLength(newKeyAlgorithmChoice.getId(), 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 = null; + } else { + Calendar selectedCal = Calendar.getInstance(TimeZone.getTimeZone("UTC")); + //noinspection ResourceType + selectedCal.set(mExpiryDatePicker.getYear(), + mExpiryDatePicker.getMonth(), mExpiryDatePicker.getDayOfMonth()); + expiry = selectedCal.getTime().getTime() / 1000; + } + + SaveKeyringParcel.SubkeyAdd newSubkey = new SaveKeyringParcel.SubkeyAdd( + newKeyAlgorithmChoice.getId(), + newKeySize, + flags, + expiry + ); + mAlgorithmSelectedListener.onAlgorithmSelected(newSubkey); + } + } + ); + + dialog.setCancelable(true); + dialog.setNegativeButton(android.R.string.cancel, + new DialogInterface.OnClickListener() { + public void onClick(DialogInterface di, int id) { + di.dismiss(); + } + } + ); + + 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) { + setKeyLengthSpinnerValuesForAlgorithm(((Choice) parent.getSelectedItem()).getId()); + + setCustomKeyVisibility(); + setOkButtonAvailability(alertDialog); + } + + @Override + public void onNothingSelected(AdapterView<?> parent) { + } + }); + + return alertDialog; + } + + 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 1024 (according to + * <a href="https://github.com/open-keychain/open-keychain/issues/102">#102</a>). 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 1536, 2048, 3072, 4096 or 8192 bits.</p> + * <h3>DSA</h3> + * <p>For DSA algorithm key length must be between 512 and 1024. 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(int algorithmId, int currentKeyLength) { + final int[] elGamalSupportedLengths = {1536, 2048, 3072, 4096, 8192}; + int properKeyLength = -1; + switch (algorithmId) { + case PublicKeyAlgorithmTags.RSA_GENERAL: + if (currentKeyLength > 1024 && currentKeyLength <= 16384) { + properKeyLength = currentKeyLength + ((8 - (currentKeyLength % 8)) % 8); + } + break; + case PublicKeyAlgorithmTags.ELGAMAL_ENCRYPT: + 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 PublicKeyAlgorithmTags.DSA: + if (currentKeyLength >= 512 && currentKeyLength <= 1024) { + properKeyLength = currentKeyLength + ((64 - (currentKeyLength % 64)) % 64); + } + break; + } + return properKeyLength; + } + + private void setOkButtonAvailability(AlertDialog alertDialog) { + final Choice selectedAlgorithm = (Choice) mAlgorithmSpinner.getSelectedItem(); + final int selectedKeySize = getSelectedKeyLength(); //Integer.parseInt((String) mKeySizeSpinner.getSelectedItem()); + final int properKeyLength = getProperKeyLength(selectedAlgorithm.getId(), selectedKeySize); + alertDialog.getButton(AlertDialog.BUTTON_POSITIVE).setEnabled(properKeyLength > 0); + } + + 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(getActivity().INPUT_METHOD_SERVICE); + imm.hideSoftInputFromWindow(mCustomKeyEditText.getWindowToken(), 0); + } + } + + private void setKeyLengthSpinnerValuesForAlgorithm(int algorithmId) { + final ArrayAdapter<CharSequence> keySizeAdapter = (ArrayAdapter<CharSequence>) mKeySizeSpinner.getAdapter(); + final Object selectedItem = mKeySizeSpinner.getSelectedItem(); + keySizeAdapter.clear(); + switch (algorithmId) { + case PublicKeyAlgorithmTags.RSA_GENERAL: + replaceArrayAdapterContent(keySizeAdapter, R.array.rsa_key_size_spinner_values); + mCustomKeyInfoTextView.setText(getResources().getString(R.string.key_size_custom_info_rsa)); + break; + case PublicKeyAlgorithmTags.ELGAMAL_ENCRYPT: + replaceArrayAdapterContent(keySizeAdapter, R.array.elgamal_key_size_spinner_values); + mCustomKeyInfoTextView.setText(""); // ElGamal does not support custom key length + break; + case PublicKeyAlgorithmTags.DSA: + replaceArrayAdapterContent(keySizeAdapter, R.array.dsa_key_size_spinner_values); + mCustomKeyInfoTextView.setText(getResources().getString(R.string.key_size_custom_info_dsa)); + break; + } + keySizeAdapter.notifyDataSetChanged(); + + // when switching algorithm, try to select same key length as before + for (int i = 0; i < keySizeAdapter.getCount(); i++) { + if (selectedItem.equals(keySizeAdapter.getItem(i))) { + mKeySizeSpinner.setSelection(i); + break; + } + } + } + + @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); + } + } + } + +} |