src/com/android/se/security/gpac/Response_RefreshTag_DO.java

/*
 * Copyright (C) 2017 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
 * Copyright (c) 2017, The Linux Foundation.
 */

/*
 * Copyright 2012 Giesecke & Devrient GmbH.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.android.se.security.gpac;

/**
 * Response-RefreshTag DO The GET DATA (RefreshTag) command has to return a refresh tag indicating
 * changes in the access control data in a RefreshTag DO. This refresh tag is an attribute (8-byte
 * random number) of the ARA-M which is newly generated if the ARA-M detects an update of access
 * control data in the Secure Element.
 */
public class Response_RefreshTag_DO extends BerTlv {

    public static final int TAG = 0xDF20;

    private long mRefreshTag;
    private byte[] mRefreshTagArray = null;

    public Response_RefreshTag_DO(byte[] rawData, int valueIndex, int valueLength) {
        super(rawData, TAG, valueIndex, valueLength);
    }

    public long getRefreshTag() {
        return mRefreshTag;
    }

    public byte[] getRefreshTagArray() {
        return mRefreshTagArray;
    }

    @Override
    /**
     * Tag: DF 20 Length: 8 bytes Value: The RefreshTag is an 8 bytes random number. A new
     * RefreshTag
     * value indicates changes in the access control data stored in the SE.
     */
    public void interpret() throws ParserException {

        mRefreshTag = 0;

        if (super.getValueLength() != 8) {
            throw new ParserException("Invalid length of RefreshTag DO!");
        }

        byte[] data = super.getRawData();
        int index = super.getValueIndex();

        if (index + super.getValueLength() > data.length) {
            throw new ParserException("Not enough data for RefreshTag DO!");
        }
        mRefreshTagArray = new byte[super.getValueLength()];
        System.arraycopy(data, index, mRefreshTagArray, 0, mRefreshTagArray.length);

        long temp;
        temp = data[index++];
        mRefreshTag = (temp << 56L);
        temp = data[index++];
        mRefreshTag += (temp << 48L);
        temp = data[index++];
        mRefreshTag += (temp << 40L);
        temp = data[index++];
        mRefreshTag += (temp << 32L);
        temp = data[index++];
        mRefreshTag += (temp << 24L);
        temp = data[index++];
        mRefreshTag += (temp << 16L);
        temp = data[index++];
        mRefreshTag += (temp << 8L);
        temp = data[index++];
        mRefreshTag += (temp);
    }
}