151 lines
4.3 KiB
Java
151 lines
4.3 KiB
Java
/*
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* Copyright (C) 2017 Schürmann & Breitmoser GbR
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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.securitytoken;
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import android.nfc.Tag;
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import androidx.annotation.Nullable;
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import org.sufficientlysecure.keychain.Constants;
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import org.sufficientlysecure.keychain.securitytoken.SecurityTokenInfo.TokenType;
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import org.sufficientlysecure.keychain.securitytoken.SecurityTokenInfo.TransportType;
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import java.io.IOException;
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import nordpol.IsoCard;
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import nordpol.android.AndroidCard;
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import timber.log.Timber;
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import static org.bouncycastle.util.encoders.Hex.toHexString;
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public class NfcTransport implements Transport {
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// timeout is set to 100 seconds to avoid cancellation during calculation
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private static final int TIMEOUT = 100 * 1000;
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private final Tag mTag;
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private IsoCard mIsoCard;
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public static class IsoDepNotSupportedException extends IOException {
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IsoDepNotSupportedException(String detailMessage) {
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super(detailMessage);
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}
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}
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public NfcTransport(Tag tag) {
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this.mTag = tag;
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}
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/**
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* Transmit and receive data
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* @param data data to transmit
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* @return received data
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* @throws IOException
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*/
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@Override
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public ResponseApdu transceive(final CommandApdu data) throws IOException {
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byte[] rawCommand = data.toBytes();
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if (Constants.DEBUG) {
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Timber.d("nfc out: " + toHexString(rawCommand));
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}
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byte[] rawResponse = mIsoCard.transceive(rawCommand);
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if (Constants.DEBUG) {
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Timber.d("nfc in: " + toHexString(rawResponse));
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}
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return ResponseApdu.fromBytes(rawResponse);
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}
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/**
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* Disconnect and release connection
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*/
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@Override
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public void release() {
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// Not supported
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}
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@Override
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public boolean isConnected() {
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return mIsoCard != null && mIsoCard.isConnected();
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}
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/**
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* Check if Transport supports persistent connections e.g connections which can
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* handle multiple operations in one session
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* @return true if transport supports persistent connections
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*/
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@Override
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public boolean isPersistentConnectionAllowed() {
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return false;
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}
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/**
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* Connect to NFC device.
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* <p/>
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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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* <p/>
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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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@Override
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public void connect() throws IOException {
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mIsoCard = AndroidCard.get(mTag);
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if (mIsoCard == null) {
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throw new IsoDepNotSupportedException("Tag does not support ISO-DEP (ISO 14443-4)");
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}
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mIsoCard.setTimeout(TIMEOUT);
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mIsoCard.connect();
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}
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@Override
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public TransportType getTransportType() {
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return TransportType.NFC;
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}
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@Nullable
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@Override
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public TokenType getTokenTypeIfAvailable() {
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// Sadly, the NFC transport has no direct information about the token type.
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return null;
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}
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@Override
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public boolean equals(final Object o) {
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if (this == o) return true;
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if (o == null || getClass() != o.getClass()) return false;
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final NfcTransport that = (NfcTransport) o;
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if (mTag != null ? !mTag.equals(that.mTag) : that.mTag != null) return false;
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if (mIsoCard != null ? !mIsoCard.equals(that.mIsoCard) : that.mIsoCard != null)
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return false;
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return true;
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}
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@Override
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public int hashCode() {
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int result = mTag != null ? mTag.hashCode() : 0;
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result = 31 * result + (mIsoCard != null ? mIsoCard.hashCode() : 0);
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return result;
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}
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}
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