903 lines
35 KiB
Java
903 lines
35 KiB
Java
/*
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* Copyright (C) 2015 Dominik Schürmann <dominik@dominikschuermann.de>
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* Copyright (C) 2015 Vincent Breitmoser <v.breitmoser@mugenguild.com>
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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.base;
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import java.io.IOException;
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import java.math.BigInteger;
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import java.nio.ByteBuffer;
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import java.security.interfaces.RSAPrivateCrtKey;
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import android.app.Activity;
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import android.app.PendingIntent;
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import android.content.Intent;
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import android.content.IntentFilter;
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import android.nfc.NfcAdapter;
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import android.nfc.Tag;
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import android.nfc.tech.IsoDep;
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import android.os.Bundle;
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import android.widget.Toast;
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import org.spongycastle.bcpg.HashAlgorithmTags;
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import org.spongycastle.util.Arrays;
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import org.spongycastle.util.encoders.Hex;
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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.pgp.CanonicalizedSecretKey;
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import org.sufficientlysecure.keychain.pgp.exception.PgpGeneralException;
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import org.sufficientlysecure.keychain.pgp.exception.PgpKeyNotFoundException;
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import org.sufficientlysecure.keychain.provider.CachedPublicKeyRing;
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import org.sufficientlysecure.keychain.provider.KeychainContract.KeyRings;
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import org.sufficientlysecure.keychain.provider.ProviderHelper;
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import org.sufficientlysecure.keychain.service.PassphraseCacheService;
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import org.sufficientlysecure.keychain.service.PassphraseCacheService.KeyNotFoundException;
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import org.sufficientlysecure.keychain.service.input.CryptoInputParcel;
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import org.sufficientlysecure.keychain.service.input.RequiredInputParcel;
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import org.sufficientlysecure.keychain.ui.CreateKeyActivity;
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import org.sufficientlysecure.keychain.ui.PassphraseDialogActivity;
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import org.sufficientlysecure.keychain.ui.ViewKeyActivity;
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import org.sufficientlysecure.keychain.ui.util.KeyFormattingUtils;
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import org.sufficientlysecure.keychain.ui.util.Notify;
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import org.sufficientlysecure.keychain.ui.util.Notify.Style;
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import org.sufficientlysecure.keychain.util.Iso7816TLV;
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import org.sufficientlysecure.keychain.util.Log;
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import org.sufficientlysecure.keychain.util.Passphrase;
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import org.sufficientlysecure.keychain.util.Preferences;
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public abstract class BaseNfcActivity extends BaseActivity {
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public static final int REQUEST_CODE_PIN = 1;
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protected Passphrase mPin;
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protected Passphrase mAdminPin;
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protected boolean mPw1ValidForMultipleSignatures;
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protected boolean mPw1ValidatedForSignature;
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protected boolean mPw1ValidatedForDecrypt; // Mode 82 does other things; consider renaming?
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protected boolean mPw3Validated;
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private NfcAdapter mNfcAdapter;
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private IsoDep mIsoDep;
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private static final int TIMEOUT = 100000;
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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Intent intent = getIntent();
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String action = intent.getAction();
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if (NfcAdapter.ACTION_TAG_DISCOVERED.equals(action)) {
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throw new AssertionError("should not happen: NfcOperationActivity.onCreate is called instead of onNewIntent!");
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}
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}
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/**
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* This activity is started as a singleTop activity.
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* All new NFC Intents which are delivered to this activity are handled here
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*/
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@Override
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public void onNewIntent(Intent intent) {
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if (NfcAdapter.ACTION_TAG_DISCOVERED.equals(intent.getAction())) {
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try {
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handleNdefDiscoveredIntent(intent);
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} catch (CardException e) {
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handleNfcError(e);
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} catch (IOException e) {
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handleNfcError(e);
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}
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}
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}
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public void handleNfcError(IOException e) {
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Log.e(Constants.TAG, "nfc error", e);
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Notify.create(this, getString(R.string.error_nfc, e.getMessage()), Style.WARN).show();
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}
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public void handleNfcError(CardException e) {
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Log.e(Constants.TAG, "card error", e);
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short status = e.getResponseCode();
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// When entering a PIN, a status of 63CX indicates X attempts remaining.
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if ((status & (short)0xFFF0) == 0x63C0) {
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Notify.create(this, getString(R.string.error_pin, status & 0x000F), Style.WARN).show();
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return;
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}
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// Otherwise, all status codes are fixed values.
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switch (status) {
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// These errors should not occur in everyday use; if they are returned, it means we
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// made a mistake sending data to the card, or the card is misbehaving.
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case 0x6A80: {
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Notify.create(this, getString(R.string.error_nfc_bad_data), Style.WARN).show();
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break;
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}
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case 0x6883: {
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Notify.create(this, getString(R.string.error_nfc_chaining_error), Style.WARN).show();
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break;
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}
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case 0x6B00: {
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Notify.create(this, getString(R.string.error_nfc_header, "P1/P2"), Style.WARN).show();
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break;
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}
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case 0x6D00: {
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Notify.create(this, getString(R.string.error_nfc_header, "INS"), Style.WARN).show();
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break;
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}
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case 0x6E00: {
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Notify.create(this, getString(R.string.error_nfc_header, "CLA"), Style.WARN).show();
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break;
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}
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// These error conditions are more likely to be experienced by an end user.
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case 0x6285: {
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Notify.create(this, getString(R.string.error_nfc_terminated), Style.WARN).show();
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break;
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}
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case 0x6700: {
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Notify.create(this, getString(R.string.error_nfc_wrong_length), Style.WARN).show();
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break;
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}
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case 0x6982: {
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Notify.create(this, getString(R.string.error_nfc_security_not_satisfied),
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Style.WARN).show();
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break;
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}
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case 0x6983: {
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Notify.create(this, getString(R.string.error_nfc_authentication_blocked),
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Style.WARN).show();
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break;
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}
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case 0x6985: {
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Notify.create(this, getString(R.string.error_nfc_conditions_not_satisfied),
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Style.WARN).show();
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break;
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}
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// 6A88 is "Not Found" in the spec, but Yubikey also returns 6A83 for this in some cases.
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case 0x6A88:
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case 0x6A83: {
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Notify.create(this, getString(R.string.error_nfc_data_not_found), Style.WARN).show();
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break;
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}
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// 6F00 is a JavaCard proprietary status code, SW_UNKNOWN, and usually represents an
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// unhandled exception on the smart card.
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case 0x6F00: {
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Notify.create(this, getString(R.string.error_nfc_unknown), Style.WARN).show();
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break;
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}
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default:
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Notify.create(this, getString(R.string.error_nfc, e.getMessage()), Style.WARN).show();
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}
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}
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public void handlePinError() {
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toast("Wrong PIN!");
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setResult(RESULT_CANCELED);
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finish();
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}
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/**
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* Called when the system is about to start resuming a previous activity,
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* disables NFC Foreground Dispatch
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*/
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public void onPause() {
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super.onPause();
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Log.d(Constants.TAG, "BaseNfcActivity.onPause");
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disableNfcForegroundDispatch();
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}
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/**
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* Called when the activity will start interacting with the user,
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* enables NFC Foreground Dispatch
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*/
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public void onResume() {
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super.onResume();
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Log.d(Constants.TAG, "BaseNfcActivity.onResume");
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enableNfcForegroundDispatch();
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}
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protected void obtainYubiKeyPin(RequiredInputParcel requiredInput) {
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// shortcut if we only use the default yubikey pin
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Preferences prefs = Preferences.getPreferences(this);
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if (prefs.useDefaultYubiKeyPin()) {
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mPin = new Passphrase("123456");
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return;
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}
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try {
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Passphrase phrase = PassphraseCacheService.getCachedPassphrase(this,
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requiredInput.getMasterKeyId(), requiredInput.getSubKeyId());
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if (phrase != null) {
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mPin = phrase;
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return;
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}
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Intent intent = new Intent(this, PassphraseDialogActivity.class);
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intent.putExtra(PassphraseDialogActivity.EXTRA_REQUIRED_INPUT,
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RequiredInputParcel.createRequiredPassphrase(requiredInput));
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startActivityForResult(intent, REQUEST_CODE_PIN);
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} catch (KeyNotFoundException e) {
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throw new AssertionError(
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"tried to find passphrase for non-existing key. this is a programming error!");
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}
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}
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protected void setYubiKeyPin(Passphrase pin) {
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mPin = pin;
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}
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@Override
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protected void onActivityResult(int requestCode, int resultCode, Intent data) {
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switch (requestCode) {
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case REQUEST_CODE_PIN: {
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if (resultCode != Activity.RESULT_OK) {
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setResult(resultCode);
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finish();
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return;
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}
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CryptoInputParcel input = data.getParcelableExtra(PassphraseDialogActivity.RESULT_CRYPTO_INPUT);
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mPin = input.getPassphrase();
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break;
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}
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default:
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super.onActivityResult(requestCode, resultCode, data);
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}
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}
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/** Handle NFC communication and return a result.
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*
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* This method is called by onNewIntent above upon discovery of an NFC tag.
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* It handles initialization and login to the application, subsequently
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* calls either nfcCalculateSignature() or nfcDecryptSessionKey(), then
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* finishes the activity with an appropriate result.
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*
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* On general communication, see also
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* http://www.cardwerk.com/smartcards/smartcard_standard_ISO7816-4_annex-a.aspx
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*
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* References to pages are generally related to the OpenPGP Application
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* on ISO SmartCard Systems specification.
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*
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*/
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protected void handleNdefDiscoveredIntent(Intent intent) throws IOException {
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Tag detectedTag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
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// Connect to the detected tag, setting a couple of settings
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mIsoDep = IsoDep.get(detectedTag);
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mIsoDep.setTimeout(TIMEOUT); // timeout is set to 100 seconds to avoid cancellation during calculation
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mIsoDep.connect();
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// SW1/2 0x9000 is the generic "ok" response, which we expect most of the time.
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// See specification, page 51
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String accepted = "9000";
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// Command APDU (page 51) for SELECT FILE command (page 29)
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String opening =
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"00" // CLA
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+ "A4" // INS
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+ "04" // P1
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+ "00" // P2
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+ "06" // Lc (number of bytes)
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+ "D27600012401" // Data (6 bytes)
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+ "00"; // Le
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String response = nfcCommunicate(opening); // activate connection
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if ( ! response.endsWith(accepted) ) {
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throw new CardException("Initialization failed!", parseCardStatus(response));
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}
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byte[] pwStatusBytes = nfcGetPwStatusBytes();
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mPw1ValidForMultipleSignatures = (pwStatusBytes[0] == 1);
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mPw1ValidatedForSignature = false;
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mPw1ValidatedForDecrypt = false;
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mPw3Validated = false;
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// TODO: Handle non-default Admin PIN
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mAdminPin = new Passphrase("12345678");
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onNfcPerform();
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mIsoDep.close();
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mIsoDep = null;
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}
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protected void onNfcPerform() throws IOException {
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final byte[] nfcFingerprints = nfcGetFingerprints();
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final String nfcUserId = nfcGetUserId();
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final byte[] nfcAid = nfcGetAid();
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final long subKeyId = KeyFormattingUtils.getKeyIdFromFingerprint(nfcFingerprints);
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try {
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CachedPublicKeyRing ring = new ProviderHelper(this).getCachedPublicKeyRing(
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KeyRings.buildUnifiedKeyRingsFindBySubkeyUri(subKeyId));
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long masterKeyId = ring.getMasterKeyId();
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Intent intent = new Intent(this, ViewKeyActivity.class);
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intent.setData(KeyRings.buildGenericKeyRingUri(masterKeyId));
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intent.putExtra(ViewKeyActivity.EXTRA_NFC_AID, nfcAid);
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intent.putExtra(ViewKeyActivity.EXTRA_NFC_USER_ID, nfcUserId);
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intent.putExtra(ViewKeyActivity.EXTRA_NFC_FINGERPRINTS, nfcFingerprints);
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startActivity(intent);
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} catch (PgpKeyNotFoundException e) {
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Intent intent = new Intent(this, CreateKeyActivity.class);
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intent.putExtra(CreateKeyActivity.EXTRA_NFC_AID, nfcAid);
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intent.putExtra(CreateKeyActivity.EXTRA_NFC_USER_ID, nfcUserId);
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intent.putExtra(CreateKeyActivity.EXTRA_NFC_FINGERPRINTS, nfcFingerprints);
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startActivity(intent);
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}
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}
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/** Return the key id from application specific data stored on tag, or null
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* if it doesn't exist.
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*
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* @param idx Index of the key to return the fingerprint from.
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* @return The long key id of the requested key, or null if not found.
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*/
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public Long nfcGetKeyId(int idx) throws IOException {
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byte[] fp = nfcGetFingerprint(idx);
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if (fp == null) {
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return null;
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}
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ByteBuffer buf = ByteBuffer.wrap(fp);
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// skip first 12 bytes of the fingerprint
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buf.position(12);
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// the last eight bytes are the key id (big endian, which is default order in ByteBuffer)
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return buf.getLong();
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}
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/** Return fingerprints of all keys from application specific data stored
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* on tag, or null if data not available.
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*
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* @return The fingerprints of all subkeys in a contiguous byte array.
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*/
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public byte[] nfcGetFingerprints() throws IOException {
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String data = "00CA006E00";
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byte[] buf = mIsoDep.transceive(Hex.decode(data));
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Iso7816TLV tlv = Iso7816TLV.readSingle(buf, true);
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Log.d(Constants.TAG, "nfc tlv data:\n" + tlv.prettyPrint());
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Iso7816TLV fptlv = Iso7816TLV.findRecursive(tlv, 0xc5);
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if (fptlv == null) {
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return null;
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}
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return fptlv.mV;
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}
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/** Return the PW Status Bytes from the card. This is a simple DO; no TLV decoding needed.
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*
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* @return Seven bytes in fixed format, plus 0x9000 status word at the end.
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*/
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public byte[] nfcGetPwStatusBytes() throws IOException {
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String data = "00CA00C400";
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return mIsoDep.transceive(Hex.decode(data));
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}
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/** Return the fingerprint from application specific data stored on tag, or
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* null if it doesn't exist.
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*
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* @param idx Index of the key to return the fingerprint from.
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* @return The fingerprint of the requested key, or null if not found.
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*/
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public byte[] nfcGetFingerprint(int idx) throws IOException {
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byte[] data = nfcGetFingerprints();
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// return the master key fingerprint
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ByteBuffer fpbuf = ByteBuffer.wrap(data);
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byte[] fp = new byte[20];
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fpbuf.position(idx * 20);
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fpbuf.get(fp, 0, 20);
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return fp;
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}
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public byte[] nfcGetAid() throws IOException {
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String info = "00CA004F00";
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return mIsoDep.transceive(Hex.decode(info));
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}
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public String nfcGetUserId() throws IOException {
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String info = "00CA006500";
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return nfcGetHolderName(nfcCommunicate(info));
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}
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/**
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* Calls to calculate the signature and returns the MPI value
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*
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* @param hash the hash for signing
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* @return a big integer representing the MPI for the given hash
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*/
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public byte[] nfcCalculateSignature(byte[] hash, int hashAlgo) throws IOException {
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if (!mPw1ValidatedForSignature) {
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nfcVerifyPIN(0x81); // (Verify PW1 with mode 81 for signing)
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}
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// dsi, including Lc
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String dsi;
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Log.i(Constants.TAG, "Hash: " + hashAlgo);
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switch (hashAlgo) {
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case HashAlgorithmTags.SHA1:
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if (hash.length != 20) {
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throw new IOException("Bad hash length (" + hash.length + ", expected 10!");
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}
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dsi = "23" // Lc
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+ "3021" // Tag/Length of Sequence, the 0x21 includes all following 33 bytes
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+ "3009" // Tag/Length of Sequence, the 0x09 are the following header bytes
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+ "0605" + "2B0E03021A" // OID of SHA1
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+ "0500" // TLV coding of ZERO
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+ "0414" + getHex(hash); // 0x14 are 20 hash bytes
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break;
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case HashAlgorithmTags.RIPEMD160:
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if (hash.length != 20) {
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throw new IOException("Bad hash length (" + hash.length + ", expected 20!");
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}
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dsi = "233021300906052B2403020105000414" + getHex(hash);
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break;
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case HashAlgorithmTags.SHA224:
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if (hash.length != 28) {
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throw new IOException("Bad hash length (" + hash.length + ", expected 28!");
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}
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dsi = "2F302D300D06096086480165030402040500041C" + getHex(hash);
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break;
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case HashAlgorithmTags.SHA256:
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if (hash.length != 32) {
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throw new IOException("Bad hash length (" + hash.length + ", expected 32!");
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}
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dsi = "333031300D060960864801650304020105000420" + getHex(hash);
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break;
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case HashAlgorithmTags.SHA384:
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if (hash.length != 48) {
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throw new IOException("Bad hash length (" + hash.length + ", expected 48!");
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}
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dsi = "433041300D060960864801650304020205000430" + getHex(hash);
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break;
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case HashAlgorithmTags.SHA512:
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if (hash.length != 64) {
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throw new IOException("Bad hash length (" + hash.length + ", expected 64!");
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}
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dsi = "533051300D060960864801650304020305000440" + getHex(hash);
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break;
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|
default:
|
|
throw new IOException("Not supported hash algo!");
|
|
}
|
|
|
|
// Command APDU for PERFORM SECURITY OPERATION: COMPUTE DIGITAL SIGNATURE (page 37)
|
|
String apdu =
|
|
"002A9E9A" // CLA, INS, P1, P2
|
|
+ dsi // digital signature input
|
|
+ "00"; // Le
|
|
|
|
String response = nfcCommunicate(apdu);
|
|
|
|
// split up response into signature and status
|
|
String status = response.substring(response.length()-4);
|
|
String signature = response.substring(0, response.length() - 4);
|
|
|
|
// while we are getting 0x61 status codes, retrieve more data
|
|
while (status.substring(0, 2).equals("61")) {
|
|
Log.d(Constants.TAG, "requesting more data, status " + status);
|
|
// Send GET RESPONSE command
|
|
response = nfcCommunicate("00C00000" + status.substring(2));
|
|
status = response.substring(response.length()-4);
|
|
signature += response.substring(0, response.length()-4);
|
|
}
|
|
|
|
Log.d(Constants.TAG, "final response:" + status);
|
|
|
|
if (!mPw1ValidForMultipleSignatures) {
|
|
mPw1ValidatedForSignature = false;
|
|
}
|
|
|
|
if ( ! "9000".equals(status)) {
|
|
throw new CardException("Bad NFC response code: " + status, parseCardStatus(response));
|
|
}
|
|
|
|
// Make sure the signature we received is actually the expected number of bytes long!
|
|
if (signature.length() != 256 && signature.length() != 512) {
|
|
throw new IOException("Bad signature length! Expected 128 or 256 bytes, got " + signature.length() / 2);
|
|
}
|
|
|
|
return Hex.decode(signature);
|
|
}
|
|
|
|
/**
|
|
* Calls to calculate the signature and returns the MPI value
|
|
*
|
|
* @param encryptedSessionKey the encoded session key
|
|
* @return the decoded session key
|
|
*/
|
|
public byte[] nfcDecryptSessionKey(byte[] encryptedSessionKey) throws IOException {
|
|
if (!mPw1ValidatedForDecrypt) {
|
|
nfcVerifyPIN(0x82); // (Verify PW1 with mode 82 for decryption)
|
|
}
|
|
|
|
String firstApdu = "102a8086fe";
|
|
String secondApdu = "002a808603";
|
|
String le = "00";
|
|
|
|
byte[] one = new byte[254];
|
|
// leave out first byte:
|
|
System.arraycopy(encryptedSessionKey, 1, one, 0, one.length);
|
|
|
|
byte[] two = new byte[encryptedSessionKey.length - 1 - one.length];
|
|
for (int i = 0; i < two.length; i++) {
|
|
two[i] = encryptedSessionKey[i + one.length + 1];
|
|
}
|
|
|
|
String first = nfcCommunicate(firstApdu + getHex(one));
|
|
String second = nfcCommunicate(secondApdu + getHex(two) + le);
|
|
|
|
String decryptedSessionKey = nfcGetDataField(second);
|
|
|
|
Log.d(Constants.TAG, "decryptedSessionKey: " + decryptedSessionKey);
|
|
|
|
return Hex.decode(decryptedSessionKey);
|
|
}
|
|
|
|
/** Verifies the user's PW1 or PW3 with the appropriate mode.
|
|
*
|
|
* @param mode For PW1, this is 0x81 for signing, 0x82 for everything else.
|
|
* For PW3 (Admin PIN), mode is 0x83.
|
|
*/
|
|
public void nfcVerifyPIN(int mode) throws IOException {
|
|
if (mPin != null || mode == 0x83) {
|
|
byte[] pin;
|
|
|
|
if (mode == 0x83) {
|
|
pin = new String(mAdminPin.getCharArray()).getBytes();
|
|
} else {
|
|
pin = new String(mPin.getCharArray()).getBytes();
|
|
}
|
|
|
|
// SW1/2 0x9000 is the generic "ok" response, which we expect most of the time.
|
|
// See specification, page 51
|
|
String accepted = "9000";
|
|
|
|
// Command APDU for VERIFY command (page 32)
|
|
String login =
|
|
"00" // CLA
|
|
+ "20" // INS
|
|
+ "00" // P1
|
|
+ String.format("%02x", mode) // P2
|
|
+ String.format("%02x", pin.length) // Lc
|
|
+ Hex.toHexString(pin);
|
|
String response = nfcCommunicate(login); // login
|
|
if (!response.equals(accepted)) {
|
|
handlePinError();
|
|
throw new CardException("Bad PIN!", parseCardStatus(response));
|
|
}
|
|
|
|
if (mode == 0x81) {
|
|
mPw1ValidatedForSignature = true;
|
|
} else if (mode == 0x82) {
|
|
mPw1ValidatedForDecrypt = true;
|
|
} else if (mode == 0x83) {
|
|
mPw3Validated = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
/** Modifies the user's PW1 or PW3. Before sending, the new PIN will be validated for
|
|
* conformance to the card's requirements for key length.
|
|
*
|
|
* @param pw For PW1, this is 0x81. For PW3 (Admin PIN), mode is 0x83.
|
|
* @param newPinString The new PW1 or PW3.
|
|
*/
|
|
public void nfcModifyPIN(int pw, String newPinString) throws IOException {
|
|
final int MAX_PW1_LENGTH_INDEX = 1;
|
|
final int MAX_PW3_LENGTH_INDEX = 3;
|
|
|
|
byte[] pwStatusBytes = nfcGetPwStatusBytes();
|
|
byte[] newPin = newPinString.getBytes();
|
|
|
|
if (pw == 0x81) {
|
|
if (newPin.length < 6 || newPin.length > pwStatusBytes[MAX_PW1_LENGTH_INDEX]) {
|
|
throw new IOException("Invalid PIN length");
|
|
}
|
|
} else if (pw == 0x83) {
|
|
if (newPin.length < 8 || newPin.length > pwStatusBytes[MAX_PW3_LENGTH_INDEX]) {
|
|
throw new IOException("Invalid PIN length");
|
|
}
|
|
} else {
|
|
throw new IOException("Invalid PW index for modify PIN operation");
|
|
}
|
|
|
|
byte[] pin;
|
|
|
|
if (pw == 0x83) {
|
|
pin = new String(mAdminPin.getCharArray()).getBytes();
|
|
} else {
|
|
pin = new String(mPin.getCharArray()).getBytes();
|
|
}
|
|
|
|
// Command APDU for CHANGE REFERENCE DATA command (page 32)
|
|
String changeReferenceDataApdu = "00" // CLA
|
|
+ "24" // INS
|
|
+ "00" // P1
|
|
+ String.format("%02x", pw) // P2
|
|
+ String.format("%02x", pin.length + newPin.length) // Lc
|
|
+ getHex(pin)
|
|
+ getHex(newPin);
|
|
String response = nfcCommunicate(changeReferenceDataApdu); // change PIN
|
|
if (!response.equals("9000")) {
|
|
handlePinError();
|
|
throw new CardException("Failed to change PIN", parseCardStatus(response));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Stores a data object on the card. Automatically validates the proper PIN for the operation.
|
|
* Supported for all data objects < 255 bytes in length. Only the cardholder certificate
|
|
* (0x7F21) can exceed this length.
|
|
*
|
|
* @param dataObject The data object to be stored.
|
|
* @param data The data to store in the object
|
|
*/
|
|
public void nfcPutData(int dataObject, byte[] data) throws IOException {
|
|
if (data.length > 254) {
|
|
throw new IOException("Cannot PUT DATA with length > 254");
|
|
}
|
|
if (dataObject == 0x0101 || dataObject == 0x0103) {
|
|
if (!mPw1ValidatedForDecrypt) {
|
|
nfcVerifyPIN(0x82); // (Verify PW1 for non-signing operations)
|
|
}
|
|
} else if (!mPw3Validated) {
|
|
nfcVerifyPIN(0x83); // (Verify PW3)
|
|
}
|
|
|
|
String putDataApdu = "00" // CLA
|
|
+ "DA" // INS
|
|
+ String.format("%02x", (dataObject & 0xFF00) >> 8) // P1
|
|
+ String.format("%02x", dataObject & 0xFF) // P2
|
|
+ String.format("%02x", data.length) // Lc
|
|
+ getHex(data);
|
|
|
|
String response = nfcCommunicate(putDataApdu); // put data
|
|
if (!response.equals("9000")) {
|
|
throw new CardException("Failed to put data.", parseCardStatus(response));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Puts a key on the card in the given slot.
|
|
*
|
|
* @param slot The slot on the card where the key should be stored:
|
|
* 0xB6: Signature Key
|
|
* 0xB8: Decipherment Key
|
|
* 0xA4: Authentication Key
|
|
*/
|
|
public void nfcPutKey(int slot, CanonicalizedSecretKey secretKey, Passphrase passphrase)
|
|
throws IOException {
|
|
if (slot != 0xB6 && slot != 0xB8 && slot != 0xA4) {
|
|
throw new IOException("Invalid key slot");
|
|
}
|
|
|
|
RSAPrivateCrtKey crtSecretKey = null;
|
|
try {
|
|
secretKey.unlock(passphrase);
|
|
crtSecretKey = secretKey.getCrtSecretKey();
|
|
} catch (PgpGeneralException e) {
|
|
throw new IOException(e.getMessage());
|
|
}
|
|
|
|
// Shouldn't happen; the UI should block the user from getting an incompatible key this far.
|
|
if (crtSecretKey.getModulus().bitLength() > 2048) {
|
|
throw new IOException("Key too large to export to smart card.");
|
|
}
|
|
|
|
// Should happen only rarely; all GnuPG keys since 2006 use public exponent 65537.
|
|
if (!crtSecretKey.getPublicExponent().equals(new BigInteger("65537"))) {
|
|
throw new IOException("Invalid public exponent for smart card key.");
|
|
}
|
|
|
|
if (!mPw3Validated) {
|
|
nfcVerifyPIN(0x83); // (Verify PW1 with mode 83)
|
|
}
|
|
|
|
byte[] header= Hex.decode(
|
|
"4D82" + "03A2" // Extended header list 4D82, length of 930 bytes. (page 23)
|
|
+ String.format("%02x", slot) + "00" // CRT to indicate targeted key, no length
|
|
+ "7F48" + "15" // Private key template 0x7F48, length 21 (decimal, 0x15 hex)
|
|
+ "9103" // Public modulus, length 3
|
|
+ "928180" // Prime P, length 128
|
|
+ "938180" // Prime Q, length 128
|
|
+ "948180" // Coefficient (1/q mod p), length 128
|
|
+ "958180" // Prime exponent P (d mod (p - 1)), length 128
|
|
+ "968180" // Prime exponent Q (d mod (1 - 1)), length 128
|
|
+ "97820100" // Modulus, length 256, last item in private key template
|
|
+ "5F48" + "820383");// DO 5F48; 899 bytes of concatenated key data will follow
|
|
byte[] dataToSend = new byte[934];
|
|
byte[] currentKeyObject;
|
|
int offset = 0;
|
|
|
|
System.arraycopy(header, 0, dataToSend, offset, header.length);
|
|
offset += header.length;
|
|
currentKeyObject = crtSecretKey.getPublicExponent().toByteArray();
|
|
System.arraycopy(currentKeyObject, 0, dataToSend, offset, 3);
|
|
offset += 3;
|
|
// NOTE: For a 2048-bit key, these lengths are fixed. However, bigint includes a leading 0
|
|
// in the array to represent sign, so we take care to set the offset to 1 if necessary.
|
|
currentKeyObject = crtSecretKey.getPrimeP().toByteArray();
|
|
System.arraycopy(currentKeyObject, currentKeyObject.length - 128, dataToSend, offset, 128);
|
|
Arrays.fill(currentKeyObject, (byte)0);
|
|
offset += 128;
|
|
currentKeyObject = crtSecretKey.getPrimeQ().toByteArray();
|
|
System.arraycopy(currentKeyObject, currentKeyObject.length - 128, dataToSend, offset, 128);
|
|
Arrays.fill(currentKeyObject, (byte)0);
|
|
offset += 128;
|
|
currentKeyObject = crtSecretKey.getCrtCoefficient().toByteArray();
|
|
System.arraycopy(currentKeyObject, currentKeyObject.length - 128, dataToSend, offset, 128);
|
|
Arrays.fill(currentKeyObject, (byte)0);
|
|
offset += 128;
|
|
currentKeyObject = crtSecretKey.getPrimeExponentP().toByteArray();
|
|
System.arraycopy(currentKeyObject, currentKeyObject.length - 128, dataToSend, offset, 128);
|
|
Arrays.fill(currentKeyObject, (byte)0);
|
|
offset += 128;
|
|
currentKeyObject = crtSecretKey.getPrimeExponentQ().toByteArray();
|
|
System.arraycopy(currentKeyObject, currentKeyObject.length - 128, dataToSend, offset, 128);
|
|
Arrays.fill(currentKeyObject, (byte)0);
|
|
offset += 128;
|
|
currentKeyObject = crtSecretKey.getModulus().toByteArray();
|
|
System.arraycopy(currentKeyObject, currentKeyObject.length - 256, dataToSend, offset, 256);
|
|
|
|
String putKeyCommand = "10DB3FFF";
|
|
String lastPutKeyCommand = "00DB3FFF";
|
|
|
|
// Now we're ready to communicate with the card.
|
|
offset = 0;
|
|
String response;
|
|
while(offset < dataToSend.length) {
|
|
int dataRemaining = dataToSend.length - offset;
|
|
if (dataRemaining > 254) {
|
|
response = nfcCommunicate(
|
|
putKeyCommand + "FE" + Hex.toHexString(dataToSend, offset, 254)
|
|
);
|
|
offset += 254;
|
|
} else {
|
|
int length = dataToSend.length - offset;
|
|
response = nfcCommunicate(
|
|
lastPutKeyCommand + String.format("%02x", length)
|
|
+ Hex.toHexString(dataToSend, offset, length));
|
|
offset += length;
|
|
}
|
|
|
|
if (!response.endsWith("9000")) {
|
|
throw new CardException("Key export to card failed", parseCardStatus(response));
|
|
}
|
|
}
|
|
|
|
// Clear array with secret data before we return.
|
|
Arrays.fill(dataToSend, (byte) 0);
|
|
}
|
|
|
|
/**
|
|
* Parses out the status word from a JavaCard response string.
|
|
*
|
|
* @param response A hex string with the response from the card
|
|
* @return A short indicating the SW1/SW2, or 0 if a status could not be determined.
|
|
*/
|
|
short parseCardStatus(String response) {
|
|
if (response.length() < 4) {
|
|
return 0; // invalid input
|
|
}
|
|
|
|
try {
|
|
return Short.parseShort(response.substring(response.length() - 4), 16);
|
|
} catch (NumberFormatException e) {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Prints a message to the screen
|
|
*
|
|
* @param text the text which should be contained within the toast
|
|
*/
|
|
protected void toast(String text) {
|
|
Toast.makeText(this, text, Toast.LENGTH_LONG).show();
|
|
}
|
|
|
|
/**
|
|
* Receive new NFC Intents to this activity only by enabling foreground dispatch.
|
|
* This can only be done in onResume!
|
|
*/
|
|
public void enableNfcForegroundDispatch() {
|
|
mNfcAdapter = NfcAdapter.getDefaultAdapter(this);
|
|
if (mNfcAdapter == null) {
|
|
return;
|
|
}
|
|
Intent nfcI = new Intent(this, getClass())
|
|
.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_CLEAR_TOP);
|
|
PendingIntent nfcPendingIntent = PendingIntent.getActivity(this, 0, nfcI, PendingIntent.FLAG_CANCEL_CURRENT);
|
|
IntentFilter[] writeTagFilters = new IntentFilter[]{
|
|
new IntentFilter(NfcAdapter.ACTION_TAG_DISCOVERED)
|
|
};
|
|
|
|
// https://code.google.com/p/android/issues/detail?id=62918
|
|
// maybe mNfcAdapter.enableReaderMode(); ?
|
|
try {
|
|
mNfcAdapter.enableForegroundDispatch(this, nfcPendingIntent, writeTagFilters, null);
|
|
} catch (IllegalStateException e) {
|
|
Log.i(Constants.TAG, "NfcForegroundDispatch Error!", e);
|
|
}
|
|
Log.d(Constants.TAG, "NfcForegroundDispatch has been enabled!");
|
|
}
|
|
|
|
/**
|
|
* Disable foreground dispatch in onPause!
|
|
*/
|
|
public void disableNfcForegroundDispatch() {
|
|
if (mNfcAdapter == null) {
|
|
return;
|
|
}
|
|
mNfcAdapter.disableForegroundDispatch(this);
|
|
Log.d(Constants.TAG, "NfcForegroundDispatch has been disabled!");
|
|
}
|
|
|
|
public String nfcGetHolderName(String name) {
|
|
String slength;
|
|
int ilength;
|
|
name = name.substring(6);
|
|
slength = name.substring(0, 2);
|
|
ilength = Integer.parseInt(slength, 16) * 2;
|
|
name = name.substring(2, ilength + 2);
|
|
name = (new String(Hex.decode(name))).replace('<', ' ');
|
|
return (name);
|
|
}
|
|
|
|
private String nfcGetDataField(String output) {
|
|
return output.substring(0, output.length() - 4);
|
|
}
|
|
|
|
public String nfcCommunicate(String apdu) throws IOException {
|
|
return getHex(mIsoDep.transceive(Hex.decode(apdu)));
|
|
}
|
|
|
|
public static String getHex(byte[] raw) {
|
|
return new String(Hex.encode(raw));
|
|
}
|
|
|
|
public class CardException extends IOException {
|
|
private short mResponseCode;
|
|
|
|
public CardException(String detailMessage, short responseCode) {
|
|
super(detailMessage);
|
|
mResponseCode = responseCode;
|
|
}
|
|
|
|
public short getResponseCode() {
|
|
return mResponseCode;
|
|
}
|
|
|
|
}
|
|
|
|
}
|