/*
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* The contents of this file are subject to the terms of the Common Development and
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* Distribution License (the License). You may not use this file except in compliance with the
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* License.
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*
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* You can obtain a copy of the License at legal/CDDLv1.0.txt. See the License for the
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* specific language governing permission and limitations under the License.
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*
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* When distributing Covered Software, include this CDDL Header Notice in each file and include
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* the License file at legal/CDDLv1.0.txt. If applicable, add the following below the CDDL
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* Header, with the fields enclosed by brackets [] replaced by your own identifying
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* information: "Portions Copyright [year] [name of copyright owner]".
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*
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* Portions Copyright 2010-2015 ForgeRock AS.
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* BSD-compatible md5 password crypt
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* Ported to Java from C based on crypt-md5.c by Poul-Henning Kamp,
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* which was distributed with the following notice:
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* ----------------------------------------------------------------------------
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* "THE BEER-WARE LICENSE" (Revision 42):
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* <phk@login.dknet.dk> wrote this file. As long as you retain this notice you
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* can do whatever you want with this stuff. If we meet some day, and you think
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* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
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* ----------------------------------------------------------------------------
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*/
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package org.opends.server.util;
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import org.forgerock.opendj.ldap.ByteSequence;
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import org.forgerock.opendj.ldap.ByteString;
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import java.security.MessageDigest;
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import java.security.SecureRandom;
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import java.security.NoSuchAlgorithmException;
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import java.util.Arrays;
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/**
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* BSD MD5 Crypt algorithm, ported from C.
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*
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* @author ludo
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*/
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public final class BSDMD5Crypt {
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private static final String magic = "$1$";
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private static final int saltLength = 8;
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private static final String itoa64 =
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"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
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private static String intTo64(int value, int length)
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{
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StringBuilder output = new StringBuilder();
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while (--length >= 0)
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{
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output.append(itoa64.charAt(value & 0x3f));
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value >>= 6;
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}
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return output.toString();
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}
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/**
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* Encode the supplied password in BSD MD5 crypt form, using
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* a random salt.
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*
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* @param password A password to encode.
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*
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* @return An encrypted string.
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*
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* @throws NoSuchAlgorithmException If the MD5 algorithm is not supported.
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*
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*/
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public static String crypt(ByteSequence password)
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throws NoSuchAlgorithmException
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{
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SecureRandom randomGenerator = new SecureRandom();
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StringBuilder salt = new StringBuilder();
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/* Generate some random salt */
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while (salt.length() < saltLength)
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{
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int index = (int) (randomGenerator.nextFloat() * itoa64.length());
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salt.append(itoa64.charAt(index));
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}
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return BSDMD5Crypt.crypt(password, salt.toString());
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}
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/**
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* Encode the supplied password in BSD MD5 crypt form, using
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* provided salt.
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*
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* @param password A password to encode.
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*
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* @param salt A salt string of any size, of which only the first
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* 8 bytes will be considered.
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*
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* @return An encrypted string.
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*
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* @throws NoSuchAlgorithmException If the MD5 algorithm is not supported.
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*
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*/
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public static String crypt(ByteSequence password, String salt)
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throws NoSuchAlgorithmException
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{
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MessageDigest ctx, ctx1;
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byte digest1[], digest[];
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byte[] plaintextBytes = password.toByteArray();
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/* First skip the magic string */
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if (salt.startsWith(magic))
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{
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salt = salt.substring(magic.length());
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}
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/* Salt stops at the first $, max saltLength chars */
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int saltEnd = salt.indexOf('$');
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if (saltEnd != -1)
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{
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salt = salt.substring(0, saltEnd);
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}
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if (salt.length() > saltLength)
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{
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salt = salt.substring(0, saltLength);
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}
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ctx = MessageDigest.getInstance("MD5");
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/* The password first, since that is what is most unknown */
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ctx.update(plaintextBytes);
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/* Then our magic string */
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ctx.update(magic.getBytes());
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/* Then the raw salt */
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ctx.update(salt.getBytes());
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/* Then just as many characters of the MD5(password,salt,password) */
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ctx1 = MessageDigest.getInstance("MD5");
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ctx1.update(plaintextBytes);
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ctx1.update(salt.getBytes());
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ctx1.update(plaintextBytes);
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digest1 = ctx1.digest();
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for (int pl = password.length(); pl > 0; pl -= 16)
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{
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ctx.update(digest1, 0, pl > 16 ? 16 : pl);
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}
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/* Don't leave anything around in vm they could use. */
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Arrays.fill(digest1, (byte) 0);
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/* Then something really weird... */
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for (int i = password.length(); i != 0; i >>= 1)
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{
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if ((i & 1) != 0)
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{
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ctx.update(digest1[0]);
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} else
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{
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ctx.update(plaintextBytes[0]);
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}
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}
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/* Now make the output string */
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StringBuilder output = new StringBuilder();
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output.append(magic);
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output.append(salt);
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output.append("$");
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digest = ctx.digest();
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/*
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* and now, just to make sure things don't run too fast
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* On a 60 MHz Pentium this takes 34 msec, so you would
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* need 30 seconds to build a 1000 entry dictionary...
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*/
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for (int i = 0; i < 1000; i++)
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{
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ctx1 = MessageDigest.getInstance("MD5");
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if ((i & 1) != 0)
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{
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ctx1.update(plaintextBytes);
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} else
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{
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ctx1.update(digest);
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}
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if (i % 3 != 0)
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{
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ctx1.update(salt.getBytes());
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}
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if (i % 7 != 0)
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{
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ctx1.update(plaintextBytes);
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}
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if ((i & 1) != 0)
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{
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ctx1.update(digest);
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} else
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{
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ctx1.update(plaintextBytes);
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}
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digest = ctx1.digest();
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}
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int l;
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l = ((digest[0] & 0xff) << 16) | ((digest[6] & 0xff) << 8)
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| (digest[12] & 0xff);
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output.append(intTo64(l, 4));
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l = ((digest[1] & 0xff) << 16) | ((digest[7] & 0xff) << 8)
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| (digest[13] & 0xff);
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output.append(intTo64(l, 4));
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l = ((digest[2] & 0xff) << 16) | ((digest[8] & 0xff) << 8)
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| (digest[14] & 0xff);
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output.append(intTo64(l, 4));
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l = ((digest[3] & 0xff) << 16) | ((digest[9] & 0xff) << 8)
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| (digest[15] & 0xff);
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output.append(intTo64(l, 4));
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l = ((digest[4] & 0xff) << 16) | ((digest[10] & 0xff) << 8)
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| (digest[5] & 0xff);
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output.append(intTo64(l, 4));
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l = digest[11] & 0xff;
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output.append(intTo64(l, 2));
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/* Don't leave anything around in vm they could use. */
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Arrays.fill(digest, (byte) 0);
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Arrays.fill(plaintextBytes, (byte) 0);
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ctx = null;
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ctx1 = null;
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return output.toString();
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}
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/**
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* Getter to the BSD MD5 magic string.
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*
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* @return the magic string for this crypt algorithm
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*/
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public static String getMagicString()
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{
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return magic;
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}
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/**
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* Main test method.
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*
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* @param argv The array of test arguments
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*
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*/
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public static void main(String argv[])
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{
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if (argv.length < 1 || argv.length > 2)
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{
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System.err.println("Usage: BSDMD5Crypt password salt");
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System.exit(1);
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}
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try
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{
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if (argv.length == 2)
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{
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System.out.println(BSDMD5Crypt.crypt(ByteString.valueOfUtf8(argv[0]),
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argv[1]));
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} else
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{
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System.out.println(BSDMD5Crypt.crypt(ByteString.valueOfUtf8(argv[0])));
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}
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} catch (Exception e)
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{
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System.err.println(e.getMessage());
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System.exit(1);
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}
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System.exit(0);
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}
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}
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