Java Tutorial/Security/MD5 Message Digest algorithm
Содержание
- 1 Check password based on MD5
- 2 Check password salt based on MD5
- 3 creates an MD5 message digest from a file and displays it to the screen BASE64 Encoded.
- 4 Creating a Keyed Digest Using MD5
- 5 Encode an MD5 digest into a String.
- 6 Get MD5 Base64
- 7 Hash 32 String
- 8 Hash 64 String
- 9 MD5 BASE64 checksum for the specified input string.
- 10 MD5 hashing: Encodes a string
- 11 MD5 MessageDigest your message
- 12 MD5 String
- 13 MD5 your password
- 14 Password Authenticator
- 15 Password Storage Example
- 16 Set password salt
Check password based on MD5
<source lang="java">
import java.io.BufferedReader; import java.io.FileReader; import java.security.MessageDigest; public class MainClass {
public static void main(String args[]) throws Exception {
String name = "";
String passwd = "";
BufferedReader in = new BufferedReader(new FileReader("passwd.txt"));
while ((name = in.readLine()) != null) {
passwd = in.readLine();
if (name.equals(args[0])) {
break;
}
}
MessageDigest m = MessageDigest.getInstance("MD5");
m.update(args[1].getBytes("UTF8"));
byte s[] = m.digest();
String result = "";
for (int i = 0; i < s.length; i++) {
result += Integer.toHexString((0x000000ff & s[i]) | 0xffffff00).substring(6);
}
System.out.println(name.equals(args[0]) && result.equals(passwd));
}
}</source>
Check password salt based on MD5
<source lang="java">
import java.security.MessageDigest;
public class MainClass {
public static void main(String args[]) throws Exception {
String name = "name";
String passwd = "password";
String salts = "12,12,12";
String salttmp[] = salts.split(",");
byte salt[] = new byte[salttmp.length];
for (int i = 0; i < salt.length; i++) {
salt[i] = Byte.parseByte(salttmp[i]);
}
MessageDigest m = MessageDigest.getInstance("MD5");
m.update(salt);
m.update("name".getBytes("UTF8"));
byte s[] = m.digest();
String result = "";
for (int i = 0; i < s.length; i++) {
result += Integer.toHexString((0x000000ff & s[i]) | 0xffffff00).substring(6);
}
System.out.println(result.equals(passwd));
}
}</source>
creates an MD5 message digest from a file and displays it to the screen BASE64 Encoded.
<source lang="java">
import java.io.BufferedInputStream; import java.io.FileInputStream; import java.security.MessageDigest; import sun.misc.BASE64Encoder; public class MainClass {
public static void main(String[] args) throws Exception {
MessageDigest md = MessageDigest.getInstance("MD5");
BufferedInputStream in = new BufferedInputStream(new FileInputStream("inputfile.txt"));
int theByte = 0;
while ((theByte = in.read()) != -1) {
md.update((byte) theByte);
}
in.close();
byte[] theDigest = md.digest();
System.out.println(new BASE64Encoder().encode(theDigest));
}
}</source>
Creating a Keyed Digest Using MD5
<source lang="java">
import java.security.MessageDigest; public class Main {
public static void main(String[] a) throws Exception {
byte[] buffer = new byte[10000];
byte[] key = new byte[8];
MessageDigest md5 = MessageDigest.getInstance("MD5");
md5.update(buffer);
byte[] k = md5.digest(key);
}
}</source>
Encode an MD5 digest into a String.
<source lang="java">
/*
* 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. */
/**
* Encode an MD5 digest into a String.*
* The 128 bit MD5 hash is converted into a 32 character long String. * Each character of the String is the hexadecimal representation of 4 bits * of the digest. * * @author Remy Maucherat * @version $Revision: 515 $ $Date: 2008-03-17 22:02:23 +0100 (Mon, 17 Mar 2008) $ */ public final class MD5Encoder { // ----------------------------------------------------- Instance Variables private static final char[] hexadecimal = {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"}; // --------------------------------------------------------- Public Methods /** * Encodes the 128 bit (16 bytes) MD5 into a 32 character String. * * @param binaryData Array containing the digest * @return Encoded MD5, or null if encoding failed */ public String encode( byte[] binaryData ) { if (binaryData.length != 16) return null; char[] buffer = new char[32]; for (int i=0; i<16; i++) { int low = (int) (binaryData[i] & 0x0f); int high = (int) ((binaryData[i] & 0xf0) >> 4); buffer[i*2] = hexadecimal[high]; buffer[i*2 + 1] = hexadecimal[low]; } return new String(buffer); } }</source>
Get MD5 Base64
<source lang="java">
/*
* $Header: /cvsroot/mvnforum/mvnforum/contrib/phpbb2mvnforum/src/org/mvnforum/util/MD5.java,v 1.6 2007/01/15 10:27:31 dungbtm Exp $ * $Author: dungbtm $ * $Revision: 1.6 $ * $Date: 2007/01/15 10:27:31 $ * * * Copyright (C) 2002-2007 by MyVietnam.net * * All copyright notices regarding mvnForum MUST remain * intact in the scripts and in the outputted HTML. * The "powered by" text/logo with a link back to * http://www.mvnForum.ru and http://www.MyVietnam.net in * the footer of the pages MUST remain visible when the pages * are viewed on the internet or intranet. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * any later version. * * This program 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * Support can be obtained from support forums at: * http://www.mvnForum.ru/mvnforum/index * * Correspondence and Marketing Questions can be sent to: * info at MyVietnam net * * @author: */
import java.io.UnsupportedEncodingException; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import sun.misc.BASE64Encoder; // The JavaReference.ru Software License, Version 1.0 // Copyright (c) 2002-2005 JavaReference.ru. All rights reserved. // // // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions // are met: // // 1. Redistributions of source code must retain the above copyright notice, // this list of conditions and the following disclaimer. // // 2. Redistributions in binary form must reproduce the above copyright notice, // this list of conditions and the following disclaimer in the documentation // and/or other materials provided with the distribution. // // 3. The end-user documentation included with the redistribution, if any, must // include the following acknowlegement: // // "This product includes software developed by the Javareference.ru // (http://www.javareference.ru/)." // // Alternately, this acknowlegement may appear in the software itself, if and // wherever such third-party acknowlegements normally appear. // // 4. The names "JavaReference" and "Javareference.ru", must not be used to // endorse or promote products derived from this software without prior written // permission. For written permission, please contact webmaster@javareference.ru. // // 5. Products derived from this software may not be called "Javareference" nor may // "Javareference" appear in their names without prior written permission of // Javareference.ru. // // THIS SOFTWARE IS PROVIDED ``AS IS"" AND ANY EXPRESSED OR IMPLIED WARRANTIES, // INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND // FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL // JAVAREFERENCE.ru OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, // INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR // PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, // EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. // // Software from this site consists of contributions made by various individuals // on behalf of Javareference.ru. For more information on Javareference.ru, // please see http://www.javareference.ru /**
* @author anandh */
public class MD5 {
static char[] carr = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };
public static String getBase64FromHEX(String input) {
byte barr[] = new byte[16];
int bcnt = 0;
for (int i = 0; i < 32; i += 2) {
char c1 = input.charAt(i);
char c2 = input.charAt(i + 1);
int i1 = intFromChar(c1);
int i2 = intFromChar(c2);
barr[bcnt] = 0;
barr[bcnt] |= (byte) ((i1 & 0x0F) << 4);
barr[bcnt] |= (byte) (i2 & 0x0F);
bcnt++;
}
BASE64Encoder encoder = new BASE64Encoder();
return encoder.encode(barr);
}
public static synchronized String getMD5_Base64(String input) {
// please note that we dont use digest, because if we
// cannot get digest, then the second time we have to call it
// again, which will fail again
MessageDigest digest = null;
try {
digest = MessageDigest.getInstance("MD5");
} catch (Exception ex) {
ex.printStackTrace();
}
if (digest == null)
return input;
// now everything is ok, go ahead
try {
digest.update(input.getBytes("UTF-8"));
} catch (java.io.UnsupportedEncodingException ex) {
ex.printStackTrace();
}
byte[] rawData = digest.digest();
BASE64Encoder bencoder = new BASE64Encoder();
return bencoder.encode(rawData);
}
private static int intFromChar(char c) {
char clower = Character.toLowerCase(c);
for (int i = 0; i < carr.length; i++) {
if (clower == carr[i]) {
return i;
}
}
return 0;
}
public static void main(String[] args) {
//String password = args[0];
String password = "test";
MessageDigest digest = null;
try {
digest = MessageDigest.getInstance("MD5");
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
try {
digest.update(password.getBytes("UTF-8"));
} catch (UnsupportedEncodingException ex) {
ex.printStackTrace();
}
byte[] rawData = digest.digest();
StringBuffer printable = new StringBuffer();
for (int i = 0; i < rawData.length; i++) {
printable.append(carr[((rawData[i] & 0xF0) >> 4)]);
printable.append(carr[(rawData[i] & 0x0F)]);
}
String phpbbPassword = printable.toString();
System.out.println("PHPBB : " + phpbbPassword);
System.out.println("MVNFORUM : " + getMD5_Base64(password));
System.out.println("PHPBB->MVNFORUM : " + getBase64FromHEX(phpbbPassword));
}
}</source>
Hash 32 String
<source lang="java">
/*
GNU LESSER GENERAL PUBLIC LICENSE Copyright (C) 2006 The Lobo Project This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library 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 this library; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA Contact info: lobochief@users.sourceforge.net
- /
import java.io.UnsupportedEncodingException; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import java.util.ArrayList; public class Strings {
private static final MessageDigest MESSAGE_DIGEST;
public static final String[] EMPTY_ARRAY = new String[0];
static {
MessageDigest md;
try {
md = MessageDigest.getInstance("MD5");
} catch(NoSuchAlgorithmException err) {
throw new IllegalStateException();
}
MESSAGE_DIGEST = md;
}
private static final String HEX_CHARS = "0123456789ABCDEF";
public static String getMD5(String source) {
byte[] bytes;
try {
bytes = source.getBytes("UTF-8");
} catch(java.io.UnsupportedEncodingException ue) {
throw new IllegalStateException(ue);
}
byte[] result;
synchronized(MESSAGE_DIGEST) {
MESSAGE_DIGEST.update(bytes);
result = MESSAGE_DIGEST.digest();
}
char[] resChars = new char[32];
int len = result.length;
for(int i = 0; i < len; i++) {
byte b = result[i];
int lo4 = b & 0x0F;
int hi4 = (b & 0xF0) >> 4;
resChars[i*2] = HEX_CHARS.charAt(hi4);
resChars[i*2 + 1] = HEX_CHARS.charAt(lo4);
}
return new String(resChars);
}
public static String getHash32(String source) throws UnsupportedEncodingException {
String md5 = getMD5(source);
return md5.substring(0, 8);
}
public static String getHash64(String source) throws UnsupportedEncodingException {
String md5 = getMD5(source);
return md5.substring(0, 16);
}
}</source>
Hash 64 String
<source lang="java">
/*
GNU LESSER GENERAL PUBLIC LICENSE Copyright (C) 2006 The Lobo Project This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library 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 this library; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA Contact info: lobochief@users.sourceforge.net
- /
import java.io.UnsupportedEncodingException; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import java.util.ArrayList; public class Strings {
private static final MessageDigest MESSAGE_DIGEST;
public static final String[] EMPTY_ARRAY = new String[0];
static {
MessageDigest md;
try {
md = MessageDigest.getInstance("MD5");
} catch(NoSuchAlgorithmException err) {
throw new IllegalStateException();
}
MESSAGE_DIGEST = md;
}
private static final String HEX_CHARS = "0123456789ABCDEF";
public static String getMD5(String source) {
byte[] bytes;
try {
bytes = source.getBytes("UTF-8");
} catch(java.io.UnsupportedEncodingException ue) {
throw new IllegalStateException(ue);
}
byte[] result;
synchronized(MESSAGE_DIGEST) {
MESSAGE_DIGEST.update(bytes);
result = MESSAGE_DIGEST.digest();
}
char[] resChars = new char[32];
int len = result.length;
for(int i = 0; i < len; i++) {
byte b = result[i];
int lo4 = b & 0x0F;
int hi4 = (b & 0xF0) >> 4;
resChars[i*2] = HEX_CHARS.charAt(hi4);
resChars[i*2 + 1] = HEX_CHARS.charAt(lo4);
}
return new String(resChars);
}
public static String getHash32(String source) throws UnsupportedEncodingException {
String md5 = getMD5(source);
return md5.substring(0, 8);
}
public static String getHash64(String source) throws UnsupportedEncodingException {
String md5 = getMD5(source);
return md5.substring(0, 16);
}
}</source>
MD5 BASE64 checksum for the specified input string.
<source lang="java">
import javax.swing.JOptionPane; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; /**
* MD5 common utils. Check and calculate MD5 BASE64 sum. * * @author Luigi Zurolo - Liscio Luca * @version 1.1 */
public class MD5 {
/**
* MD5 BASE64 checksum for the specified input string.
*
* @param input -
* Specified input string
* @return String - MD5 BASE64 sum
*/
public static String checkMD5(String input) {
try {
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(input.getBytes());
byte[] enc = md.digest();
String md5Sum = new sun.misc.BASE64Encoder().encode(enc);
return md5Sum;
} catch (NoSuchAlgorithmException nsae) {
System.out.println(nsae.getMessage());
return null;
}
}
}</source>
MD5 hashing: Encodes a string
<source lang="java">
/*
* Copyright (c) JForum Team * All rights reserved. * * Redistribution and use in source and binary forms, * with or without modification, are permitted provided * that the following conditions are met: * * 1) Redistributions of source code must retain the above * copyright notice, this list of conditions and the * following disclaimer. * 2) Redistributions in binary form must reproduce the * above copyright notice, this list of conditions and * the following disclaimer in the documentation and/or * other materials provided with the distribution. * 3) Neither the name of "Rafael Steil" nor * the names of its contributors may be used to endorse * or promote products derived from this software without * specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT * HOLDERS AND CONTRIBUTORS "AS IS" AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL * THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER * IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE * * This file creation date: Mar 29, 2003 / 1:15:50 AM * The JForum Project * http://www.jforum.net */
import java.security.MessageDigest; import java.security.NoSuchAlgorithmException;
/**
* Encodes a string using MD5 hashing * * @author Rafael Steil * @version $Id: MD5.java,v 1.7 2006/08/23 02:13:44 rafaelsteil Exp $ */
public class MD5 {
/**
* Encodes a string
*
* @param str String to encode
* @return Encoded String
* @throws NoSuchAlgorithmException
*/
public static String crypt(String str)
{
if (str == null || str.length() == 0) {
throw new IllegalArgumentException("String to encript cannot be null or zero length");
}
StringBuffer hexString = new StringBuffer();
try {
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(str.getBytes());
byte[] hash = md.digest();
for (int i = 0; i < hash.length; i++) {
if ((0xff & hash[i]) < 0x10) {
hexString.append("0" + Integer.toHexString((0xFF & hash[i])));
}
else {
hexString.append(Integer.toHexString(0xFF & hash[i]));
}
}
}
catch (NoSuchAlgorithmException e) {
throw new RuntimeException("" + e);
}
return hexString.toString();
}
}</source>
MD5 MessageDigest your message
<source lang="java">
import java.io.FileInputStream; import java.security.DigestInputStream; import java.security.MessageDigest; public class MainClass {
public static void main(String args[]) throws Exception {
MessageDigest m = MessageDigest.getInstance("MD5");
FileInputStream fin = new FileInputStream(args[0]);
DigestInputStream din = new DigestInputStream(fin, m);
din.on(false);
int b;
while ((b = din.read()) != -1) {
if (b == "X") {
din.on(true);
}
}
byte s[] = m.digest();
for (int i = 0; i < s.length; i++) {
System.out.print( Integer.toHexString((0x000000ff & s[i]) | 0xffffff00).substring(6));
}
}
}</source>
MD5 String
<source lang="java">
/*
GNU LESSER GENERAL PUBLIC LICENSE Copyright (C) 2006 The Lobo Project This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library 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 this library; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA Contact info: lobochief@users.sourceforge.net
- /
import java.io.UnsupportedEncodingException; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import java.util.ArrayList; public class Strings {
private static final MessageDigest MESSAGE_DIGEST;
public static final String[] EMPTY_ARRAY = new String[0];
static {
MessageDigest md;
try {
md = MessageDigest.getInstance("MD5");
} catch(NoSuchAlgorithmException err) {
throw new IllegalStateException();
}
MESSAGE_DIGEST = md;
}
private static final String HEX_CHARS = "0123456789ABCDEF";
public static String getMD5(String source) {
byte[] bytes;
try {
bytes = source.getBytes("UTF-8");
} catch(java.io.UnsupportedEncodingException ue) {
throw new IllegalStateException(ue);
}
byte[] result;
synchronized(MESSAGE_DIGEST) {
MESSAGE_DIGEST.update(bytes);
result = MESSAGE_DIGEST.digest();
}
char[] resChars = new char[32];
int len = result.length;
for(int i = 0; i < len; i++) {
byte b = result[i];
int lo4 = b & 0x0F;
int hi4 = (b & 0xF0) >> 4;
resChars[i*2] = HEX_CHARS.charAt(hi4);
resChars[i*2 + 1] = HEX_CHARS.charAt(lo4);
}
return new String(resChars);
}
public static String getHash32(String source) throws UnsupportedEncodingException {
String md5 = getMD5(source);
return md5.substring(0, 8);
}
public static String getHash64(String source) throws UnsupportedEncodingException {
String md5 = getMD5(source);
return md5.substring(0, 16);
}
}</source>
MD5 your password
<source lang="java">
import java.security.MessageDigest; public class MainClass {
public static void main(String args[]) throws Exception {
String name = "name";
String passwd = "password";
MessageDigest m = MessageDigest.getInstance("MD5");
m.update(passwd.getBytes("UTF8"));
byte s[] = m.digest();
String result = "";
for (int i = 0; i < s.length; i++) {
result += Integer.toHexString((0x000000ff & s[i]) | 0xffffff00).substring(6);
}
System.out.println(name);
System.out.println(result);
}
} /*name 5f4dcc3b5aa765d61d8327deb882cf99*/</source>
Password Authenticator
<source lang="java">
import java.io.ByteArrayOutputStream; import java.io.FileInputStream; import java.security.MessageDigest; import java.util.Arrays; public class MainClass {
public static void main(String[] args) throws Exception {
authenticatePassword("password");
}
private static void authenticatePassword(String password) throws Exception {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
FileInputStream fis = new FileInputStream("password");
int theByte = 0;
while ((theByte = fis.read()) != -1) {
baos.write(theByte);
}
fis.close();
byte[] hashedPasswordWithSalt = baos.toByteArray();
baos.reset();
byte[] salt = new byte[12];
System.arraycopy(hashedPasswordWithSalt, 0, salt, 0, 12);
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(salt);
md.update(password.getBytes("UTF8"));
byte[] digest = md.digest();
byte[] digestInFile = new byte[hashedPasswordWithSalt.length - 12];
System.arraycopy(hashedPasswordWithSalt, 12, digestInFile, 0,
hashedPasswordWithSalt.length - 12);
System.out.println(Arrays.equals(digest, digestInFile));
}
}</source>
Password Storage Example
<source lang="java">
import java.io.ByteArrayOutputStream; import java.io.FileInputStream; import java.io.FileOutputStream; import java.security.MessageDigest; import java.security.SecureRandom; import java.util.Arrays; public class MainClass {
public static void main(String[] args) throws Exception {
createPassword("password");
}
private static void createPassword(String password) throws Exception {
SecureRandom random = new SecureRandom();
byte[] salt = new byte[12];
random.nextBytes(salt);
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(salt);
md.update(password.getBytes("UTF8"));
byte[] digest = md.digest();
FileOutputStream fos = new FileOutputStream("password");
fos.write(salt);
fos.write(digest);
fos.close();
}
}</source>
Set password salt
<source lang="java">
import java.security.MessageDigest; import java.util.Random; public class MainClass {
public static void main(String args[]) throws Exception {
String name = "name";
String passwd = "password";
Random rand = new Random();
byte[] salt = new byte[12];
rand.nextBytes(salt);
MessageDigest m = MessageDigest.getInstance("MD5");
m.update(salt);
m.update(passwd.getBytes("UTF8"));
byte s[] = m.digest();
String result = "";
for (int i = 0; i < s.length; i++) {
result += Integer.toHexString((0x000000ff & s[i]) | 0xffffff00).substring(6);
}
System.out.println(name);
for (int i = 0; i < salt.length; i++) {
System.out.print(salt[i] + ",");
}
System.out.println(result);
}
} /*name 72,83,-8,78,-82,125,0,-37,-116,-83,-72,27,460a21b49082e5268a4016bfa2e2885c*/</source>
