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/*
* Copyright (c) 2015 Cisco Systems, Inc. and others. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 which accompanies this distribution,
* and is available at http://www.eclipse.org/legal/epl-v10.html
*/
package org.opendaylight.aaa.api;
import java.security.MessageDigest;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock.WriteLock;
import javax.xml.bind.DatatypeConverter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* @author Sharon Aicler (saichler@cisco.com)
*/
public class SHA256Calculator {
private static final Logger LOG = LoggerFactory.getLogger(SHA256Calculator.class);
private static MessageDigest md = null;
private static ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
private static WriteLock writeLock = lock.writeLock();
public static String generateSALT() {
StringBuffer salt = new StringBuffer();
for (int i = 0; i < 12; i++) {
int random = (int) (Math.random() * 24 + 1);
salt.append((char) (65 + random));
}
return salt.toString();
}
public static String getSHA256(byte data[], String salt) {
byte SALT[] = salt.getBytes();
byte temp[] = new byte[data.length + SALT.length];
System.arraycopy(data, 0, temp, 0, data.length);
System.arraycopy(SALT, 0, temp, data.length, SALT.length);
if (md == null) {
try {
writeLock.lock();
if (md == null) {
try {
md = MessageDigest.getInstance("SHA-256");
} catch (Exception err) {
LOG.error("Error calculating SHA-256 for SALT", err);
}
}
} finally {
writeLock.unlock();
}
}
byte by[] = null;
try {
writeLock.lock();
md.update(temp);
by = md.digest();
} finally {
writeLock.unlock();
}
//Make sure the outcome hash does not contain special characters
return DatatypeConverter.printBase64Binary(by);
}
public static String getSHA256(String password, String salt) {
return getSHA256(password.getBytes(), salt);
}
}
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