/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE
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* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
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* add the following below this CDDL HEADER, with the fields enclosed
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* by brackets "[]" replaced with your own identifying information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Portions Copyright 2006-2007 Sun Microsystems, Inc.
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*/
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package org.opends.server.extensions;
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import java.security.MessageDigest;
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import java.security.SecureRandom;
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import java.util.Arrays;
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import java.util.concurrent.locks.ReentrantLock;
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import org.opends.server.api.PasswordStorageScheme;
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import org.opends.server.config.ConfigEntry;
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import org.opends.server.config.ConfigException;
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import org.opends.server.core.DirectoryServer;
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import org.opends.server.types.ByteString;
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import org.opends.server.types.ByteStringFactory;
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import org.opends.server.types.DirectoryException;
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import org.opends.server.types.ErrorLogCategory;
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import org.opends.server.types.ErrorLogSeverity;
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import org.opends.server.types.InitializationException;
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import org.opends.server.types.ResultCode;
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import org.opends.server.util.Base64;
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import static org.opends.server.extensions.ExtensionsConstants.*;
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import static org.opends.server.loggers.debug.DebugLogger.debugCaught;
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import static org.opends.server.loggers.debug.DebugLogger.debugEnabled;
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import org.opends.server.types.DebugLogLevel;
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import static org.opends.server.loggers.Error.*;
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import static org.opends.server.messages.ExtensionsMessages.*;
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import static org.opends.server.messages.MessageHandler.*;
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import static org.opends.server.util.StaticUtils.*;
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/**
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* This class defines a Directory Server password storage scheme based on the
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* 384-bit SHA-2 algorithm defined in FIPS 180-2. This is a one-way digest
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* algorithm so there is no way to retrieve the original clear-text version of
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* the password from the hashed value (although this means that it is not
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* suitable for things that need the clear-text password like DIGEST-MD5). The
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* values that it generates are also salted, which protects against dictionary
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* attacks. It does this by generating a 64-bit random salt which is appended to
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* the clear-text value. A SHA-2 hash is then generated based on this, the salt
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* is appended to the hash, and then the entire value is base64-encoded.
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*/
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public class SaltedSHA384PasswordStorageScheme
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extends PasswordStorageScheme
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{
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/**
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* The fully-qualified name of this class.
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*/
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private static final String CLASS_NAME =
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"org.opends.server.extensions.SaltedSHA384PasswordStorageScheme";
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/**
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* The number of bytes of random data to use as the salt when generating the
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* hashes.
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*/
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private static final int NUM_SALT_BYTES = 8;
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// The message digest that will actually be used to generate the 384-bit SHA-2
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// hashes.
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private MessageDigest messageDigest;
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// The lock used to provide threadsafe access to the message digest.
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private ReentrantLock digestLock;
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// The secure random number generator to use to generate the salt values.
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private SecureRandom random;
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/**
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* Creates a new instance of this password storage scheme. Note that no
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* initialization should be performed here, as all initialization should be
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* done in the <CODE>initializePasswordStorageScheme</CODE> method.
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*/
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public SaltedSHA384PasswordStorageScheme()
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{
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super();
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}
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/**
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* {@inheritDoc}
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*/
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@Override()
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public void initializePasswordStorageScheme(ConfigEntry configEntry)
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throws ConfigException, InitializationException
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{
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try
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{
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messageDigest =
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MessageDigest.getInstance(MESSAGE_DIGEST_ALGORITHM_SHA_384);
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}
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catch (Exception e)
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{
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if (debugEnabled())
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{
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debugCaught(DebugLogLevel.ERROR, e);
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}
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int msgID = MSGID_PWSCHEME_CANNOT_INITIALIZE_MESSAGE_DIGEST;
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String message = getMessage(msgID, MESSAGE_DIGEST_ALGORITHM_SHA_384,
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String.valueOf(e));
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throw new InitializationException(msgID, message, e);
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}
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digestLock = new ReentrantLock();
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random = new SecureRandom();
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}
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/**
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* {@inheritDoc}
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*/
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@Override()
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public String getStorageSchemeName()
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{
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return STORAGE_SCHEME_NAME_SALTED_SHA_384;
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}
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/**
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* {@inheritDoc}
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*/
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@Override()
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public ByteString encodePassword(ByteString plaintext)
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throws DirectoryException
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{
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byte[] plainBytes = plaintext.value();
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byte[] saltBytes = new byte[NUM_SALT_BYTES];
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byte[] plainPlusSalt = new byte[plainBytes.length + NUM_SALT_BYTES];
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System.arraycopy(plainBytes, 0, plainPlusSalt,0,plainBytes.length);
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byte[] digestBytes;
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digestLock.lock();
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try
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{
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// Generate the salt and put in the plain+salt array.
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random.nextBytes(saltBytes);
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System.arraycopy(saltBytes,0, plainPlusSalt, plainBytes.length,
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NUM_SALT_BYTES);
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// Create the hash from the concatenated value.
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digestBytes = messageDigest.digest(plainPlusSalt);
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}
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catch (Exception e)
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{
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if (debugEnabled())
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{
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debugCaught(DebugLogLevel.ERROR, e);
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}
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int msgID = MSGID_PWSCHEME_CANNOT_ENCODE_PASSWORD;
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String message = getMessage(msgID, CLASS_NAME,
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stackTraceToSingleLineString(e));
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throw new DirectoryException(DirectoryServer.getServerErrorResultCode(),
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message, msgID, e);
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}
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finally
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{
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digestLock.unlock();
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}
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// Append the salt to the hashed value and base64-the whole thing.
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byte[] hashPlusSalt = new byte[digestBytes.length + NUM_SALT_BYTES];
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System.arraycopy(digestBytes, 0, hashPlusSalt, 0, digestBytes.length);
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System.arraycopy(saltBytes, 0, hashPlusSalt, digestBytes.length,
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NUM_SALT_BYTES);
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return ByteStringFactory.create(Base64.encode(hashPlusSalt));
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}
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/**
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* {@inheritDoc}
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*/
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@Override()
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public ByteString encodePasswordWithScheme(ByteString plaintext)
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throws DirectoryException
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{
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StringBuilder buffer = new StringBuilder();
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buffer.append('{');
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buffer.append(STORAGE_SCHEME_NAME_SALTED_SHA_384);
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buffer.append('}');
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byte[] plainBytes = plaintext.value();
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byte[] saltBytes = new byte[NUM_SALT_BYTES];
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byte[] plainPlusSalt = new byte[plainBytes.length + NUM_SALT_BYTES];
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System.arraycopy(plainBytes, 0, plainPlusSalt,0,plainBytes.length);
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byte[] digestBytes;
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digestLock.lock();
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try
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{
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// Generate the salt and put in the plain+salt array.
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random.nextBytes(saltBytes);
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System.arraycopy(saltBytes,0, plainPlusSalt, plainBytes.length,
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NUM_SALT_BYTES);
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// Create the hash from the concatenated value.
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digestBytes = messageDigest.digest(plainPlusSalt);
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}
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catch (Exception e)
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{
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if (debugEnabled())
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{
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debugCaught(DebugLogLevel.ERROR, e);
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}
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int msgID = MSGID_PWSCHEME_CANNOT_ENCODE_PASSWORD;
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String message = getMessage(msgID, CLASS_NAME,
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stackTraceToSingleLineString(e));
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throw new DirectoryException(DirectoryServer.getServerErrorResultCode(),
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message, msgID, e);
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}
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finally
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{
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digestLock.unlock();
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}
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// Append the salt to the hashed value and base64-the whole thing.
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byte[] hashPlusSalt = new byte[digestBytes.length + NUM_SALT_BYTES];
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System.arraycopy(digestBytes, 0, hashPlusSalt, 0, digestBytes.length);
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System.arraycopy(saltBytes, 0, hashPlusSalt, digestBytes.length,
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NUM_SALT_BYTES);
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buffer.append(Base64.encode(hashPlusSalt));
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return ByteStringFactory.create(buffer.toString());
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}
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/**
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* {@inheritDoc}
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*/
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@Override()
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public boolean passwordMatches(ByteString plaintextPassword,
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ByteString storedPassword)
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{
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// Base64-decode the stored value and take the last 8 bytes as the salt.
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byte[] saltBytes = new byte[NUM_SALT_BYTES];
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byte[] digestBytes;
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try
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{
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byte[] decodedBytes = Base64.decode(storedPassword.stringValue());
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int digestLength = decodedBytes.length - NUM_SALT_BYTES;
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digestBytes = new byte[digestLength];
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System.arraycopy(decodedBytes, 0, digestBytes, 0, digestLength);
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System.arraycopy(decodedBytes, digestLength, saltBytes, 0,
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NUM_SALT_BYTES);
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}
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catch (Exception e)
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{
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if (debugEnabled())
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{
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debugCaught(DebugLogLevel.ERROR, e);
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}
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int msgID = MSGID_PWSCHEME_CANNOT_BASE64_DECODE_STORED_PASSWORD;
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String message = getMessage(msgID, storedPassword.stringValue(),
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String.valueOf(e));
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logError(ErrorLogCategory.EXTENSIONS, ErrorLogSeverity.MILD_ERROR,
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message, msgID);
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return false;
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}
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// Use the salt to generate a digest based on the provided plain-text value.
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byte[] plainBytes = plaintextPassword.value();
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byte[] plainPlusSalt = new byte[plainBytes.length + NUM_SALT_BYTES];
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System.arraycopy(plainBytes, 0, plainPlusSalt, 0, plainBytes.length);
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System.arraycopy(saltBytes, 0,plainPlusSalt, plainBytes.length,
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NUM_SALT_BYTES);
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byte[] userDigestBytes;
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digestLock.lock();
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try
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{
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userDigestBytes = messageDigest.digest(plainPlusSalt);
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}
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catch (Exception e)
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{
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if (debugEnabled())
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{
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debugCaught(DebugLogLevel.ERROR, e);
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}
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return false;
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}
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finally
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{
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digestLock.unlock();
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}
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return Arrays.equals(digestBytes, userDigestBytes);
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}
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/**
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* {@inheritDoc}
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*/
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@Override()
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public boolean supportsAuthPasswordSyntax()
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{
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// This storage scheme does support the authentication password syntax.
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return true;
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}
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/**
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* {@inheritDoc}
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*/
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@Override()
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public String getAuthPasswordSchemeName()
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{
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return AUTH_PASSWORD_SCHEME_NAME_SALTED_SHA_384;
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}
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/**
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* {@inheritDoc}
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*/
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@Override()
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public ByteString encodeAuthPassword(ByteString plaintext)
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throws DirectoryException
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{
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byte[] plainBytes = plaintext.value();
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byte[] saltBytes = new byte[NUM_SALT_BYTES];
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byte[] plainPlusSalt = new byte[plainBytes.length + NUM_SALT_BYTES];
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System.arraycopy(plainBytes, 0, plainPlusSalt, 0, plainBytes.length);
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byte[] digestBytes;
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digestLock.lock();
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try
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{
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// Generate the salt and put in the plain+salt array.
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random.nextBytes(saltBytes);
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System.arraycopy(saltBytes,0, plainPlusSalt, plainBytes.length,
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NUM_SALT_BYTES);
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// Create the hash from the concatenated value.
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digestBytes = messageDigest.digest(plainPlusSalt);
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}
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catch (Exception e)
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{
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if (debugEnabled())
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{
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debugCaught(DebugLogLevel.ERROR, e);
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}
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int msgID = MSGID_PWSCHEME_CANNOT_ENCODE_PASSWORD;
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String message = getMessage(msgID, CLASS_NAME,
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stackTraceToSingleLineString(e));
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throw new DirectoryException(DirectoryServer.getServerErrorResultCode(),
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message, msgID, e);
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}
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finally
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{
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digestLock.unlock();
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}
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// Encode and return the value.
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StringBuilder authPWValue = new StringBuilder();
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authPWValue.append(AUTH_PASSWORD_SCHEME_NAME_SALTED_SHA_384);
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authPWValue.append('$');
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authPWValue.append(Base64.encode(saltBytes));
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authPWValue.append('$');
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authPWValue.append(Base64.encode(digestBytes));
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return ByteStringFactory.create(authPWValue.toString());
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}
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/**
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* {@inheritDoc}
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*/
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@Override()
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public boolean authPasswordMatches(ByteString plaintextPassword,
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String authInfo, String authValue)
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{
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byte[] saltBytes;
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byte[] digestBytes;
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try
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{
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saltBytes = Base64.decode(authInfo);
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digestBytes = Base64.decode(authValue);
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}
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catch (Exception e)
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{
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if (debugEnabled())
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{
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debugCaught(DebugLogLevel.ERROR, e);
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}
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return false;
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}
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byte[] plainBytes = plaintextPassword.value();
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byte[] plainPlusSaltBytes = new byte[plainBytes.length + saltBytes.length];
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System.arraycopy(plainBytes, 0, plainPlusSaltBytes, 0, plainBytes.length);
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System.arraycopy(saltBytes, 0, plainPlusSaltBytes, plainBytes.length,
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saltBytes.length);
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digestLock.lock();
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try
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{
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return Arrays.equals(digestBytes,
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messageDigest.digest(plainPlusSaltBytes));
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}
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finally
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{
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digestLock.unlock();
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}
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}
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/**
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* {@inheritDoc}
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*/
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@Override()
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public boolean isReversible()
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{
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return false;
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}
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/**
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* {@inheritDoc}
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*/
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@Override()
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public ByteString getPlaintextValue(ByteString storedPassword)
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throws DirectoryException
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{
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int msgID = MSGID_PWSCHEME_NOT_REVERSIBLE;
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String message = getMessage(msgID, STORAGE_SCHEME_NAME_SALTED_SHA_384);
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throw new DirectoryException(ResultCode.CONSTRAINT_VIOLATION, message,
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msgID);
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}
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/**
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* {@inheritDoc}
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*/
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@Override()
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public ByteString getAuthPasswordPlaintextValue(String authInfo,
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String authValue)
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throws DirectoryException
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{
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int msgID = MSGID_PWSCHEME_NOT_REVERSIBLE;
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String message = getMessage(msgID,
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AUTH_PASSWORD_SCHEME_NAME_SALTED_SHA_384);
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throw new DirectoryException(ResultCode.CONSTRAINT_VIOLATION, message,
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msgID);
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}
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/**
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* {@inheritDoc}
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*/
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@Override()
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public boolean isStorageSchemeSecure()
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{
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// SHA-2 should be considered secure.
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return true;
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}
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}
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