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/*
* Copyright (C) 2016 Nikita Mikhailov <nikita.s.mikhailov@gmail.com>
*
* 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.securitytoken;
import android.nfc.Tag;
import org.sufficientlysecure.keychain.ui.base.BaseSecurityTokenActivity;
import java.io.IOException;
import nordpol.IsoCard;
import nordpol.android.AndroidCard;
public class NfcTransport implements Transport {
// timeout is set to 100 seconds to avoid cancellation during calculation
private static final int TIMEOUT = 100 * 1000;
private final Tag mTag;
private IsoCard mIsoCard;
public NfcTransport(Tag tag) {
this.mTag = tag;
}
/**
* Transmit and receive data
* @param data data to transmit
* @return received data
* @throws IOException
*/
@Override
public byte[] transceive(final byte[] data) throws IOException {
return mIsoCard.transceive(data);
}
/**
* Disconnect and release connection
*/
@Override
public void release() {
// Not supported
}
@Override
public boolean isConnected() {
return mIsoCard != null && mIsoCard.isConnected();
}
/**
* Check if Transport supports persistent connections e.g connections which can
* handle multiple operations in one session
* @return true if transport supports persistent connections
*/
@Override
public boolean isPersistentConnectionAllowed() {
return false;
}
/**
* Connect to NFC device.
* <p/>
* On general communication, see also
* http://www.cardwerk.com/smartcards/smartcard_standard_ISO7816-4_annex-a.aspx
* <p/>
* References to pages are generally related to the OpenPGP Application
* on ISO SmartCard Systems specification.
*/
@Override
public void connect() throws IOException {
mIsoCard = AndroidCard.get(mTag);
if (mIsoCard == null) {
throw new BaseSecurityTokenActivity.IsoDepNotSupportedException("Tag does not support ISO-DEP (ISO 14443-4)");
}
mIsoCard.setTimeout(TIMEOUT);
mIsoCard.connect();
}
@Override
public boolean equals(final Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
final NfcTransport that = (NfcTransport) o;
if (mTag != null ? !mTag.equals(that.mTag) : that.mTag != null) return false;
if (mIsoCard != null ? !mIsoCard.equals(that.mIsoCard) : that.mIsoCard != null)
return false;
return true;
}
@Override
public int hashCode() {
int result = mTag != null ? mTag.hashCode() : 0;
result = 31 * result + (mIsoCard != null ? mIsoCard.hashCode() : 0);
return result;
}
}
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