/**
* 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 edu.uci.ics.crawler4j.example.imagecrawler;
import java.security.MessageDigest;
/**
* @author Yasser Ganjisaffar <yganjisa at uci dot edu>
*/
public final class Cryptography {
private static final char[] hexChars = { '0', '1', '2', '3', '4', '5', '6',
'7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
public static String MD5(String str) {
try {
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(str.getBytes());
return hexStringFromBytes(md.digest());
} catch (Exception e) {
e.printStackTrace();
return "";
}
}
public static String MD5(byte[] source) {
try {
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(source);
return hexStringFromBytes(md.digest());
} catch (Exception e) {
e.printStackTrace();
return "";
}
}
public static byte[] MD5bytes(String str) {
try {
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(str.getBytes());
return md.digest();
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
private static String hexStringFromBytes(byte[] b) {
String hex = "";
int msb;
int lsb = 0;
int i;
// MSB maps to idx 0
for (i = 0; i < b.length; i++) {
msb = ((int) b[i] & 0x000000FF) / 16;
lsb = ((int) b[i] & 0x000000FF) % 16;
hex = hex + hexChars[msb] + hexChars[lsb];
}
return (hex);
}
}