71 lines
2.3 KiB
Java
71 lines
2.3 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 androidx.annotation.NonNull;
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import org.sufficientlysecure.keychain.securitytoken.usb.UsbTransportException;
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class RBlock extends Block {
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static final byte MASK_RBLOCK = (byte) 0b11000000;
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static final byte MASK_VALUE_RBLOCK = (byte) 0b10000000;
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private static final byte BIT_SEQUENCE = 4;
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RBlock(BlockChecksumAlgorithm checksumType, byte[] data) throws UsbTransportException {
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super(checksumType, data);
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if ((getPcb() & MASK_RBLOCK) != MASK_VALUE_RBLOCK) {
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throw new IllegalArgumentException("Data contained incorrect block type!");
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}
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if (getApdu().length != 0) {
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throw new UsbTransportException("Data in R-block");
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}
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}
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RBlock(BlockChecksumAlgorithm checksumType, byte nad, byte sequence)
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throws UsbTransportException {
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super(checksumType, nad, (byte) (MASK_VALUE_RBLOCK | ((sequence & 1) << BIT_SEQUENCE)), new byte[0], 0, 0);
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}
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public RError getError() throws UsbTransportException {
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return RError.from(getPcb());
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}
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enum RError {
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NO_ERROR(0), EDC_ERROR(1), OTHER_ERROR(2);
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private byte mLowBits;
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RError(int lowBits) {
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mLowBits = (byte) lowBits;
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}
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@NonNull
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public static RError from(byte i) throws UsbTransportException {
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for (final RError error : values()) {
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if (error.mLowBits == (i & 0x3)) {
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return error;
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}
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}
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throw new UsbTransportException("Invalid R block error bits");
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}
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}
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}
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