65 lines
2 KiB
Java
65 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;
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import java.util.Arrays;
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import com.google.auto.value.AutoValue;
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/** A response APDU as defined in ISO/IEC 7816-4. */
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@AutoValue
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@SuppressWarnings("WeakerAccess")
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public abstract class ResponseApdu {
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private static final int APDU_SW_SUCCESS = 0x9000;
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@SuppressWarnings("mutable")
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public abstract byte[] getData();
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public abstract int getSw1();
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public abstract int getSw2();
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public static ResponseApdu fromBytes(byte[] apdu) {
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if (apdu.length < 2) {
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throw new IllegalArgumentException("Response apdu must be 2 bytes or larger!");
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}
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byte[] data = Arrays.copyOfRange(apdu, 0, apdu.length - 2);
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int sw1 = apdu[apdu.length -2] & 0xff;
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int sw2 = apdu[apdu.length -1] & 0xff;
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return new AutoValue_ResponseApdu(data, sw1, sw2);
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}
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public int getSw() {
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return (getSw1() << 8) | getSw2();
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}
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public boolean isSuccess() {
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return getSw() == APDU_SW_SUCCESS;
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}
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public byte[] toBytes() {
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byte[] data = getData();
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byte[] bytes = new byte[data.length + 2];
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System.arraycopy(data, 0, bytes, 0, data.length);
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bytes[bytes.length -2] = (byte) getSw1();
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bytes[bytes.length -1] = (byte) getSw2();
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return bytes;
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}
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}
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