SaltedSHA384PasswordStorageScheme.java revision 99faa045b6241c1d2843cce1b7a9d9c97055beae
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at
* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
* add the following below this CDDL HEADER, with the fields enclosed
* by brackets "[]" replaced with your own identifying information:
* Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*
*
* Portions Copyright 2006-2007 Sun Microsystems, Inc.
*/
/**
* This class defines a Directory Server password storage scheme based on the
* 384-bit SHA-2 algorithm defined in FIPS 180-2. This is a one-way digest
* algorithm so there is no way to retrieve the original clear-text version of
* the password from the hashed value (although this means that it is not
* suitable for things that need the clear-text password like DIGEST-MD5). The
* values that it generates are also salted, which protects against dictionary
* attacks. It does this by generating a 64-bit random salt which is appended to
* the clear-text value. A SHA-2 hash is then generated based on this, the salt
* is appended to the hash, and then the entire value is base64-encoded.
*/
public class SaltedSHA384PasswordStorageScheme
extends PasswordStorageScheme
{
/**
* The fully-qualified name of this class.
*/
private static final String CLASS_NAME =
"org.opends.server.extensions.SaltedSHA384PasswordStorageScheme";
/**
* The number of bytes of random data to use as the salt when generating the
* hashes.
*/
private static final int NUM_SALT_BYTES = 8;
// The message digest that will actually be used to generate the 384-bit SHA-2
// hashes.
private MessageDigest messageDigest;
// The lock used to provide threadsafe access to the message digest.
private ReentrantLock digestLock;
// The secure random number generator to use to generate the salt values.
private SecureRandom random;
/**
* Creates a new instance of this password storage scheme. Note that no
* initialization should be performed here, as all initialization should be
* done in the <CODE>initializePasswordStorageScheme</CODE> method.
*/
public SaltedSHA384PasswordStorageScheme()
{
super();
}
/**
* {@inheritDoc}
*/
@Override()
{
try
{
}
catch (Exception e)
{
if (debugEnabled())
{
}
}
digestLock = new ReentrantLock();
random = new SecureRandom();
}
/**
* {@inheritDoc}
*/
@Override()
public String getStorageSchemeName()
{
}
/**
* {@inheritDoc}
*/
@Override()
throws DirectoryException
{
byte[] saltBytes = new byte[NUM_SALT_BYTES];
byte[] digestBytes;
digestLock.lock();
try
{
// Generate the salt and put in the plain+salt array.
// Create the hash from the concatenated value.
}
catch (Exception e)
{
if (debugEnabled())
{
}
}
finally
{
digestLock.unlock();
}
// Append the salt to the hashed value and base64-the whole thing.
}
/**
* {@inheritDoc}
*/
@Override()
throws DirectoryException
{
byte[] saltBytes = new byte[NUM_SALT_BYTES];
byte[] digestBytes;
digestLock.lock();
try
{
// Generate the salt and put in the plain+salt array.
// Create the hash from the concatenated value.
}
catch (Exception e)
{
if (debugEnabled())
{
}
}
finally
{
digestLock.unlock();
}
// Append the salt to the hashed value and base64-the whole thing.
}
/**
* {@inheritDoc}
*/
@Override()
{
// Base64-decode the stored value and take the last 8 bytes as the salt.
byte[] saltBytes = new byte[NUM_SALT_BYTES];
byte[] digestBytes;
try
{
digestBytes = new byte[digestLength];
}
catch (Exception e)
{
if (debugEnabled())
{
}
return false;
}
// Use the salt to generate a digest based on the provided plain-text value.
byte[] userDigestBytes;
digestLock.lock();
try
{
}
catch (Exception e)
{
if (debugEnabled())
{
}
return false;
}
finally
{
digestLock.unlock();
}
}
/**
* {@inheritDoc}
*/
@Override()
public boolean supportsAuthPasswordSyntax()
{
// This storage scheme does support the authentication password syntax.
return true;
}
/**
* {@inheritDoc}
*/
@Override()
public String getAuthPasswordSchemeName()
{
}
/**
* {@inheritDoc}
*/
@Override()
throws DirectoryException
{
byte[] saltBytes = new byte[NUM_SALT_BYTES];
byte[] digestBytes;
digestLock.lock();
try
{
// Generate the salt and put in the plain+salt array.
// Create the hash from the concatenated value.
}
catch (Exception e)
{
if (debugEnabled())
{
}
}
finally
{
digestLock.unlock();
}
// Encode and return the value.
}
/**
* {@inheritDoc}
*/
@Override()
{
byte[] saltBytes;
byte[] digestBytes;
try
{
}
catch (Exception e)
{
if (debugEnabled())
{
}
return false;
}
digestLock.lock();
try
{
}
finally
{
digestLock.unlock();
}
}
/**
* {@inheritDoc}
*/
@Override()
public boolean isReversible()
{
return false;
}
/**
* {@inheritDoc}
*/
@Override()
throws DirectoryException
{
msgID);
}
/**
* {@inheritDoc}
*/
@Override()
throws DirectoryException
{
msgID);
}
/**
* {@inheritDoc}
*/
@Override()
public boolean isStorageSchemeSecure()
{
// SHA-2 should be considered secure.
return true;
}
}