Returns the type MessageDigest of the input text with the input salt.
/*
* Copyright (c) 2010-2011 Plugger Antonio Begue Ponce. All Rights Reserved.
*
* This file is part of Plugger Framework.
*
* Plugger Framework is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3 as published by
* the Free Software Foundation.
*
* Plugger Framework is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Plugger Framework. If not, see <http://www.gnu.org/licenses/>.
*/
//package org.plugger.util;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/**
* This class helps with Cryptography functionality.
*
* @author Antonio Begue
* @version $Revision: 1.0 $
*/
public class Cryptography {
/**
* Returns the SHA1 of the input text.
* @param text The string to be converted.
* @return The converted string.
*/
public String hashTextSHA1(String text) {
String sha1hash = "";
try {
sha1hash = getHash("SHA-1", text, "");
} catch (Exception ex) {}
return sha1hash;
}
/**
* Returns the MD5 of the input text.
* @param text The string to be converted.
* @return The converted string.
*/
public String hashTextMD5(String text) {
String md5hash = "";
try {
md5hash = getHash("MD5", text, "");
} catch (Exception ex) {}
return md5hash;
}
/**
* Returns the type MessageDigest of the input text with the input salt.
* @param type The type of the MessageDigest algorithm.
* @param text The string to be converted.
* @param salt The salt for the conversion.
* @return The converted string.
* @throws NoSuchAlgorithmException
* @throws UnsupportedEncodingException
*/
public String getHash(String type, String text, String salt) throws NoSuchAlgorithmException, UnsupportedEncodingException {
MessageDigest md;
md = MessageDigest.getInstance(type);
byte[] hash = new byte[md.getDigestLength()];
if (!salt.isEmpty()) {
md.update(salt.getBytes("iso-8859-1"), 0, salt.length());
}
md.update(text.getBytes("iso-8859-1"), 0, text.length());
hash = md.digest();
return convertToHex(hash);
}
private String convertToHex(byte[] data) {
StringBuilder buf = new StringBuilder();
for (int i = 0; i < data.length; i++) {
int halfbyte = (data[i] >>> 4) & 0x0F;
int two_halfs = 0;
do {
if ((0 <= halfbyte) && (halfbyte <= 9)) {
buf.append((char) ('0' + halfbyte));
} else {
buf.append((char) ('a' + (halfbyte - 10)));
}
halfbyte = data[i] & 0x0F;
} while (two_halfs++ < 1);
}
return buf.toString();
}
}
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