1 files changed, 113 insertions, 0 deletions
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/securitytoken/NfcTransport.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/securitytoken/NfcTransport.java
new file mode 100644
index 000000000..ba36ebdf0
--- /dev/null
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/securitytoken/NfcTransport.java
@@ -0,0 +1,113 @@
+/*
+ * 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;
+    }
+}