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/*******************************************************************************
* Copyright (c) 2009, 2018 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
* Mykola Nikishov - multiple artifact checksums
*******************************************************************************/
package org.eclipse.equinox.internal.p2.repository.helpers;
import java.io.*;
import java.security.*;
/**
* Calculates a checksum using {@link java.security.MessageDigest}
*/
public class ChecksumProducer {
private static final int BUFFER_SIZE = 4 * 1024;
/**
* @param file should not be <code>null</code>
* @return MD5 checksum of the file or <code>null</code> in case of NoSuchAlgorithmException
* @throws IOException
*/
@Deprecated
// bug #509401 - still here to not break x-friends like in bug #507193
public static String computeMD5(File file) throws IOException {
try {
return produce(file, "MD5"); //$NON-NLS-1$
} catch (NoSuchAlgorithmException e) {
return null;
}
}
/**
* @param file should not be <code>null</code>
* @param algorithm {@link java.security.MessageDigest#getInstance(String)}
* @return checksum of the file
* @throws IOException
* @throws NoSuchAlgorithmException
*/
public static String produce(File file, String algorithm) throws IOException, NoSuchAlgorithmException {
MessageDigest messageDigest = MessageDigest.getInstance(algorithm);
try (InputStream fis = new DigestInputStream(new BufferedInputStream(new FileInputStream(file)), messageDigest)) {
byte[] buffer = new byte[BUFFER_SIZE];
while (fis.read(buffer) != -1) {
// consume stream to update digest
}
}
byte[] digest = messageDigest.digest();
return ChecksumHelper.toHexString(digest);
}
}
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