Package org.drasyl.handler.remote.protocol

Class PrivateHeader

java.lang.Object

org.drasyl.handler.remote.protocol.PrivateHeader

public abstract class PrivateHeader
extends Object

This class models the private header of a drasyl protocol message. If the PublicHeader.getArmed() flag is set, this header is fully encrypted. The header is structured as follows:

• Type: The 1 byte type value. Indicates the message type.
• ArmedLength: The 2 bytes armed length value. Indicates, the length of the encrypted portion of the message without AEAD tag.
• AuthenticationHeader: If ArmedLength value is greater than 0, a 16 bytes long authentication header is used. Otherwise this field is not present (0 bytes long).

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	PrivateHeader.MessageType

Field Summary

Fields

Modifier and Type	Field	Description
static int	ARMED_LENGTH
static int	LENGTH

Constructor Summary

Constructors

Constructor	Description
PrivateHeader()

Method Summary

Modifier and Type	Method	Description
abstract UnsignedShort	getArmedLength()
static UnsignedShort	getArmedLength(io.netty.buffer.ByteBuf byteBuf)
abstract PrivateHeader.MessageType	getType()
static PrivateHeader	of(io.netty.buffer.ByteBuf byteBuf)
static PrivateHeader	of(PrivateHeader.MessageType type, UnsignedShort armedLength)
void	writeTo(io.netty.buffer.ByteBuf byteBuf)	Writes this header to the buffer byteBuf.

Methods inherited from class java.lang.Object

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

Field Detail

LENGTH

public static final int LENGTH

See Also:

Constant Field Values

ARMED_LENGTH

public static final int ARMED_LENGTH

See Also:

Constant Field Values

Constructor Detail

PrivateHeader

public PrivateHeader()

Method Detail

getType

public abstract PrivateHeader.MessageType getType()

Returns:

the message type

getArmedLength

public abstract UnsignedShort getArmedLength()

Returns:

the armed length

writeTo

public void writeTo(io.netty.buffer.ByteBuf byteBuf)

Writes this header to the buffer byteBuf.

Parameters:

byteBuf - writes this header to the given buffer

getArmedLength

public static UnsignedShort getArmedLength(io.netty.buffer.ByteBuf byteBuf)

of

public static PrivateHeader of(io.netty.buffer.ByteBuf byteBuf)
                        throws InvalidMessageFormatException

Throws:

InvalidMessageFormatException

of

public static PrivateHeader of(PrivateHeader.MessageType type,
                               UnsignedShort armedLength)