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gnu.javax.crypto.key

Class IncomingMessage

public class IncomingMessage
extends Object
An implementation of an incoming message for use with key agreement protocols.

Field Summary

protected ByteArrayInputStream
in
The internal buffer stream containing the message's contents.
protected int
length
The length of the message contents, according to its 4-byte header.

Constructor Summary

IncomingMessage(byte[] b)
Constructs an incoming message given the message's encoded form, including its header bytes.

Method Summary

static int
fourBytesToLength(byte[] b)
Converts four octets into the number that they represent.
static IncomingMessage
getInstance(byte[] raw)
Returns an instance of a message given its encoded contents, excluding the message's header bytes.
static IncomingMessage
getInstance(byte[] raw, int offset, int len)
Returns an instance of a message given its encoded contents, excluding the message's header bytes.
boolean
hasMoreElements()
BigInteger
readMPI()
Decodes an MPI from the current message's contents.
PrivateKey
readPrivateKey()
Decodes a private key from the message.
PublicKey
readPublicKey()
Decodes a public key from the message.
String
readString()
static int
twoBytesToLength(byte[] b)
Converts two octets into the number that they represent.

Methods inherited from class java.lang.Object

clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

in

protected ByteArrayInputStream in
The internal buffer stream containing the message's contents.

length

protected int length
The length of the message contents, according to its 4-byte header.

Constructor Details

IncomingMessage

public IncomingMessage(byte[] b)
            throws KeyAgreementException
Constructs an incoming message given the message's encoded form, including its header bytes.
Parameters:
b - the encoded form, including the header bytes, of an incoming message.
Throws:
KeyAgreementException - if the buffer is malformed.

Method Details

fourBytesToLength

public static int fourBytesToLength(byte[] b)
            throws KeyAgreementException
Converts four octets into the number that they represent.
Parameters:
b - the four octets.
Returns:
the length.

getInstance

public static IncomingMessage getInstance(byte[] raw)
Returns an instance of a message given its encoded contents, excluding the message's header bytes.

Calls the method with the same name and three arguments as: getInstance(raw, 0, raw.length).

Parameters:
raw - the encoded form, excluding the header bytes.
Returns:
a new instance of IncomingMessage.

getInstance

public static IncomingMessage getInstance(byte[] raw,
                                          int offset,
                                          int len)
Returns an instance of a message given its encoded contents, excluding the message's header bytes.
Parameters:
raw - the encoded form, excluding the header bytes.
offset - offset where to start using raw bytes from.
len - number of bytes to use.
Returns:
a new instance of IncomingMessage.

hasMoreElements

public boolean hasMoreElements()

readMPI

public BigInteger readMPI()
            throws KeyAgreementException
Decodes an MPI from the current message's contents.
Returns:
a native representation of an MPI.
Throws:
KeyAgreementException - if an encoding exception occurs during the operation.

readPrivateKey

public PrivateKey readPrivateKey()
            throws KeyAgreementException
Decodes a private key from the message.

See OutgoingMessage.writePrivateKey(PrivateKey) for more details.

Throws:
KeyAgreementException - if an encoding size constraint is violated or a mismatch was detected in the encoding.

readPublicKey

public PublicKey readPublicKey()
            throws KeyAgreementException
Decodes a public key from the message.

See OutgoingMessage.writePublicKey(PublicKey) for more details on the internal format.

Throws:
KeyAgreementException - if an encoding size constraint is violated or a mismatch was detected in the encoding.

readString

public String readString()
            throws KeyAgreementException

twoBytesToLength

public static int twoBytesToLength(byte[] b)
            throws KeyAgreementException
Converts two octets into the number that they represent.
Parameters:
b - the two octets.
Returns:
the length.
IncomingMessage.java -- Copyright (C) 2003, 2006 Free Software Foundation, Inc. This file is a part of GNU Classpath. GNU Classpath 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 (at your option) any later version. GNU Classpath 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 GNU Classpath; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA Linking this library statically or dynamically with other modules is making a combined work based on this library. Thus, the terms and conditions of the GNU General Public License cover the whole combination. As a special exception, the copyright holders of this library give you permission to link this library with independent modules to produce an executable, regardless of the license terms of these independent modules, and to copy and distribute the resulting executable under terms of your choice, provided that you also meet, for each linked independent module, the terms and conditions of the license of that module. An independent module is a module which is not derived from or based on this library. If you modify this library, you may extend this exception to your version of the library, but you are not obligated to do so. If you do not wish to do so, delete this exception statement from your version.

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