Calculated the checksum of the given data array as a long value. - Java Security

Java examples for Security:CRC

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Description

Calculated the checksum of the given data array as a long value.

Demo Code

/*//  w w w.  j a v a2  s  .  c o m
 * 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 com.java2s;

public class Main {
    private static long _crc64Array[] = new long[256];

    /**
     * Calculated the checksum of the given data array as a long value.
     * 
     * @param data the data to checksum
     * @return the calculated checksum
     */
    public static long checksum(byte[] data) {
        long crc64Number = 0;
        for (int i = 0; i < data.length; ++i) {
            int symbol = data[i];
            long a = (crc64Number >>> 8);
            long b = (crc64Number ^ symbol) & 0xff;
            crc64Number = a ^ _crc64Array[(int) b];
        }

        return crc64Number;
    }
}

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