kerby-kerb/kerb-gssapi/src/main/java/org/apache/kerby/kerberos/kerb/gssapi/krb5/KerbyGssTokenBase.java

/**
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you 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 org.apache.kerby.kerberos.kerb.gssapi.krb5;


public abstract class KerbyGssTokenBase {
    public static final int TOKEN_WRAP_V1 = 0x201;
    public static final int TOKEN_MIC_V1 = 0x101;
    public static final int TOKEN_WRAP_V2 = 0x504;
    public static final int TOKEN_MIC_V2 = 0x404;

    public void writeBigEndian(byte[] buf, int offset, int value) {
        buf[offset] = (byte) (value >>> 24);
        buf[offset + 1] = (byte) (value >>> 16);
        buf[offset + 2] = (byte) (value >>> 8);
        buf[offset + 3] = (byte) (value);
    }

    public int readBigEndian(byte[] buf, int offset) {
        int value = 0;
        value += (buf[offset] & 0xFF) << 24;
        value += (buf[offset + 1] & 0xFF) << 16;
        value += (buf[offset + 2] & 0xFF) << 8;
        value += buf[offset + 3] & 0xFF;
        return value;
    }

    /**
     *
     * @param buf
     * @param offset
     * @param len should not be larger than sizeof(int)
     * @return
     */
    public int readBigEndian(byte[] buf, int offset, int len) {
        int value = 0;
        for (int i = 0; i < len; i++) {
            value += (buf[offset + i] & 0xFF) << 8;
        }
        return value;
    }
}