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/*-
* ============LICENSE_START==========================================
* OPENECOMP - DCAE
* ===================================================================
* Copyright (c) 2017 AT&T Intellectual Property. All rights reserved.
* ===================================================================
* 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.
* ============LICENSE_END============================================
*/
package org.openecomp.ncomp.sirius.manager.properties;
import java.io.FileInputStream;
import java.io.InputStream;
import java.security.MessageDigest;
import java.util.Date;
import org.openecomp.ncomp.sirius.manager.ManagementServerUtils;
public class MD5Checksum {
public static String createFileChecksum(String filename) {
try {
InputStream fis = null;
MessageDigest complete = null;
try {
fis = new FileInputStream(filename);
byte[] buffer = new byte[1024];
complete = MessageDigest.getInstance("MD5");
int numRead = 0;
while (numRead != -1) {
numRead = fis.read(buffer);
if (numRead > 0) {
complete.update(buffer, 0, numRead);
}
}
} catch (Exception e) {
ManagementServerUtils.printStackTrace(e);
} finally {
if (fis != null)
fis.close();
}
if (complete == null) return random();
return bytes2hex(complete.digest());
} catch (Exception e) {
return random();
}
}
public static String createChecksum(String s) {
try {
MessageDigest complete = MessageDigest.getInstance("MD5");
complete.update(s.getBytes());
return bytes2hex(complete.digest());
} catch (Exception e) {
ManagementServerUtils.printStackTrace(e);
return random();
}
}
public static String createChecksum(byte[] bytes) {
try {
MessageDigest complete = MessageDigest.getInstance("MD5");
complete.update(bytes);
return bytes2hex(complete.digest());
} catch (Exception e) {
ManagementServerUtils.printStackTrace(e);
return random();
}
}
// a byte array to a HEX string
private static String bytes2hex(byte[] b) throws Exception {
String result = "";
for (int i = 0; i < b.length; i++) {
result += Integer.toString((b[i] & 0xff) + 0x100, 16).substring(1);
}
return result;
}
private synchronized static String random() {
long t = new Date().getTime();
try {
Thread.sleep(1);
} catch (InterruptedException e) {
ManagementServerUtils.printStackTrace(e);
}
return Long.toString(t);
}
}
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