66 lines
2.2 KiB
Java
66 lines
2.2 KiB
Java
/*
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* Copyright (C) 2016 Nikita Mikhailov <nikita.s.mikhailov@gmail.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.securitytoken;
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import org.sufficientlysecure.keychain.securitytoken.usb.UsbTransportException;
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import java.nio.ByteBuffer;
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public class CardCapabilities {
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private static final int MASK_CHAINING = 1 << 7;
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private static final int MASK_EXTENDED = 1 << 6;
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private byte[] mCapabilityBytes;
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public CardCapabilities(byte[] historicalBytes) throws UsbTransportException {
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if ((historicalBytes == null) || (historicalBytes[0] != 0x00)) {
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throw new UsbTransportException("Invalid historical bytes category indicator byte");
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}
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mCapabilityBytes = getCapabilitiesBytes(historicalBytes);
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}
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public CardCapabilities() {
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mCapabilityBytes = null;
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}
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private static byte[] getCapabilitiesBytes(byte[] historicalBytes) {
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// Compact TLV
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ByteBuffer byteBuffer = ByteBuffer.wrap(historicalBytes, 1, historicalBytes.length - 2);
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while (byteBuffer.hasRemaining()) {
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byte tl = byteBuffer.get();
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if (tl == 0x73) { // Capabilities TL
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byte[] val = new byte[3];
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byteBuffer.get(val);
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return val;
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}
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byteBuffer.position(byteBuffer.position() + (tl & 0xF));
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}
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return null;
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}
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public boolean hasChaining() {
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return mCapabilityBytes != null && (mCapabilityBytes[2] & MASK_CHAINING) != 0;
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}
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public boolean hasExtended() {
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return mCapabilityBytes != null && (mCapabilityBytes[2] & MASK_EXTENDED) != 0;
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}
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}
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