54 lines
2 KiB
Java
54 lines
2 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 T1TpduBlockFactory {
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private BlockChecksumAlgorithm checksumType;
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T1TpduBlockFactory(BlockChecksumAlgorithm checksumType) {
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this.checksumType = checksumType;
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}
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Block fromBytes(byte[] data) throws UsbTransportException {
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byte pcbByte = data[Block.OFFSET_PCB];
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if ((pcbByte & IBlock.MASK_IBLOCK) == IBlock.MASK_VALUE_IBLOCK) {
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return new IBlock(checksumType, data);
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} else if ((pcbByte & SBlock.MASK_SBLOCK) == SBlock.MASK_VALUE_SBLOCK) {
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return new SBlock(checksumType, data);
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} else if ((pcbByte & RBlock.MASK_RBLOCK) == RBlock.MASK_VALUE_RBLOCK) {
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return new RBlock(checksumType, data);
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}
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throw new UsbTransportException("TPDU Unknown block type");
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}
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IBlock newIBlock(byte sequence, boolean chaining, byte[] apdu, int offset, int length)
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throws UsbTransportException {
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return new IBlock(checksumType, (byte) 0, sequence, chaining, apdu, offset, length);
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}
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RBlock createAckRBlock(byte receivedSeqNum) throws UsbTransportException {
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return new RBlock(checksumType, (byte) 0, (byte) (receivedSeqNum + 1));
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}
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}
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