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/*
* Copyright (c) 1996, 2012, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.security.ssl;
import java.security.SecureRandom;
import javax.net.ssl.SSLProtocolException;
/**
* Encapsulates an SSL session ID. SSL Session IDs are not reused by
* servers during the lifetime of any sessions it created. Sessions may
* be used by many connections, either concurrently (for example, two
* connections to a web server at the same time) or sequentially (over as
* long a time period as is allowed by a given server).
*
* @author Satish Dharmaraj
* @author David Brownell
*/
final
class SessionId
{
static int MAX_LENGTH = 32;
private byte sessionId []; // max 32 bytes
/** Constructs a new session ID ... perhaps for a rejoinable session */
SessionId (boolean isRejoinable, SecureRandom generator)
{
if (isRejoinable)
// this will be unique, it's a timestamp plus much randomness
sessionId = new RandomCookie (generator).random_bytes;
else
sessionId = new byte [0];
}
/** Constructs a session ID from a byte array (max size 32 bytes) */
SessionId (byte sessionId [])
{ this.sessionId = sessionId; }
/** Returns the length of the ID, in bytes */
int length ()
{ return sessionId.length; }
/** Returns the bytes in the ID. May be an empty array. */
byte [] getId ()
{
return sessionId.clone ();
}
/** Returns the ID as a string */
@Override
public String toString ()
{
int len = sessionId.length;
StringBuffer s = new StringBuffer (10 + 2 * len);
s.append ("{");
for (int i = 0; i < len; i++) {
s.append (0x0ff & sessionId [i]);
if (i != (len - 1))
s.append (", ");
}
s.append ("}");
return s.toString ();
}
/** Returns a value which is the same for session IDs which are equal */
@Override
public int hashCode ()
{
int retval = 0;
for (int i = 0; i < sessionId.length; i++)
retval += sessionId [i];
return retval;
}
/** Returns true if the parameter is the same session ID */
@Override
public boolean equals (Object obj)
{
if (!(obj instanceof SessionId))
return false;
SessionId s = (SessionId) obj;
byte b [] = s.getId ();
if (b.length != sessionId.length)
return false;
for (int i = 0; i < sessionId.length; i++) {
if (b [i] != sessionId [i])
return false;
}
return true;
}
/**
* Checks the length of the session ID to make sure it sits within
* the range called out in the specification
*/
void checkLength(ProtocolVersion pv) throws SSLProtocolException {
// As of today all versions of TLS have a 32-byte maximum length.
// In the future we can do more here to support protocol versions
// that may have longer max lengths.
if (sessionId.length > MAX_LENGTH) {
throw new SSLProtocolException("Invalid session ID length (" +
sessionId.length + " bytes)");
}
}
}
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