fm.audiobox.core.utils.MD5Checksum.java Source code

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Here is the source code for fm.audiobox.core.utils.MD5Checksum.java

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/*
 * Copyright 2009-2014 iCoreTech, Inc.
 *
 * 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 fm.audiobox.core.utils;

import org.apache.commons.codec.binary.Hex;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.io.InputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * Based on: http://javarevisited.blogspot.com/2013/06/how-to-generate-md5-checksum-for-files.html#ixzz38QFXWUu0
 */
public class MD5Checksum {

    private static final Logger logger = LoggerFactory.getLogger(MD5Checksum.class);

    /**
     * Calculate checksum of a File using MD5 algorithm
     */
    public static String checkSum(InputStream is) throws NoSuchAlgorithmException {
        String checksum = null;
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.reset();

            // Using MessageDigest update() method to provide input
            byte[] buffer = new byte[8192];
            int numOfBytesRead;
            while ((numOfBytesRead = is.read(buffer)) > 0) {
                md.update(buffer, 0, numOfBytesRead);
            }
            byte[] hash = md.digest();
            checksum = new String(Hex.encodeHex(hash));
        } catch (IOException ex) {
            logger.error(ex.getMessage());
        }

        return checksum;
    }

}