gnu.java.zrtp.packets

Class ZrtpPacketBase

java.lang.Object

gnu.java.zrtp.packets.ZrtpPacketBase

Direct Known Subclasses:

ZrtpPacketCommit, ZrtpPacketConf2Ack, ZrtpPacketConfirm, ZrtpPacketDHPart, ZrtpPacketError, ZrtpPacketErrorAck, ZrtpPacketHello, ZrtpPacketHelloAck, ZrtpPacketPing, ZrtpPacketPingAck, ZrtpPacketRelayAck, ZrtpPacketSASRelay

public class ZrtpPacketBase
extends Object

This is the base class for all ZRTP packets All other ZRTP packet classes inherit from this class. It does not have an implementation of its own.

Author:

Werner Dittmann <Werner.Dittmann@t-online.de>

Field Summary

Fields

Modifier and Type	Field and Description
static int	CLIENT_ID_SIZE
static int	CRC_SIZE The size of the ZRTP specific CRC field.
static int	HASH_IMAGE_SIZE
static int	HMAC_SIZE
static int	HVI_SIZE
protected byte[]	packetBuffer
static int	ZID_SIZE
protected static int	ZRTP_HEADER_LENGTH The length of the standard ZRTP packet header
static int	ZRTP_WORD_SIZE A word in ZRTP is 4 bytes long.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	ZrtpPacketBase(byte[] pb)

Method Summary

Modifier and Type	Method and Description
byte[]	getHeaderBase()
short	getLength()
String	getMessageType()
boolean	isZrtpPacket() Check if packet buffer contains the generic ZRTP id field.
protected void	setLength(int length) Set the length of the packet (in ZRTP words) into the packet header.
void	setMessageType(byte[] messageType) Copy the message type to the ZRTP packet header.
protected void	setZrtpId() Copy the unique ZRTP id into the ZRTP packer header

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

ZRTP_WORD_SIZE

public static final int ZRTP_WORD_SIZE

A word in ZRTP is 4 bytes long.

See Also:

Constant Field Values

ZID_SIZE

public static final int ZID_SIZE

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Constant Field Values

CLIENT_ID_SIZE

public static final int CLIENT_ID_SIZE

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Constant Field Values

HASH_IMAGE_SIZE

public static final int HASH_IMAGE_SIZE

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Constant Field Values

HVI_SIZE

public static final int HVI_SIZE

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Constant Field Values

HMAC_SIZE

public static final int HMAC_SIZE

See Also:

Constant Field Values

CRC_SIZE

public static final int CRC_SIZE

The size of the ZRTP specific CRC field.

See Also:

Constant Field Values

ZRTP_HEADER_LENGTH

protected static final int ZRTP_HEADER_LENGTH

The length of the standard ZRTP packet header

See Also:

Constant Field Values

packetBuffer

protected byte[] packetBuffer

Constructor Detail

ZrtpPacketBase

protected ZrtpPacketBase(byte[] pb)

Method Detail

getHeaderBase

public final byte[] getHeaderBase()

isZrtpPacket

public final boolean isZrtpPacket()

Check if packet buffer contains the generic ZRTP id field.

Returns:

true if packet buffer contains ZRTP id, false otherwise.

getLength

public final short getLength()

getMessageType

public final String getMessageType()

setZrtpId

protected final void setZrtpId()

Copy the unique ZRTP id into the ZRTP packer header

setLength

protected final void setLength(int length)

Set the length of the packet (in ZRTP words) into the packet header. The method first converts the integer into network order.

Parameters:

length - The length of the packet in ZRTP words

setMessageType

public final void setMessageType(byte[] messageType)

Copy the message type to the ZRTP packet header.

Parameters:

messageType - The message type name.