55 lines
1.9 KiB
Java
55 lines
1.9 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.usb.tpdu;
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import org.sufficientlysecure.keychain.securitytoken.usb.UsbTransportException;
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class IBlock extends Block {
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static final byte MASK_IBLOCK = (byte) 0b10000000;
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static final byte MASK_VALUE_IBLOCK = (byte) 0b00000000;
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private static final byte BIT_SEQUENCE = 6;
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private static final byte BIT_CHAINING = 5;
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IBlock(BlockChecksumAlgorithm checksumType, byte[] data) throws UsbTransportException {
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super(checksumType, data);
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if ((getPcb() & MASK_IBLOCK) != MASK_VALUE_IBLOCK) {
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throw new IllegalArgumentException("Data contained incorrect block type!");
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}
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}
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IBlock(BlockChecksumAlgorithm checksumType, byte nad, byte sequence, boolean chaining, byte[] apdu, int offset,
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int length)
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throws UsbTransportException {
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super(checksumType, nad,
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(byte) (((sequence & 1) << BIT_SEQUENCE) | (chaining ? 1 << BIT_CHAINING : 0)),
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apdu, offset, length);
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}
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byte getSequence() {
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return (byte) ((getPcb() >> BIT_SEQUENCE) & 1);
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}
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boolean getChaining() {
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return ((getPcb() >> BIT_CHAINING) & 1) != 0;
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}
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}
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