Package net.i2p.client.datagram

Class I2PDatagramMaker

java.lang.Object

net.i2p.client.datagram.I2PDatagramMaker

public final class I2PDatagramMaker
extends Object

Class for creating I2P repliable datagrams. Note that objects of this class are NOT THREAD SAFE!

Author:

human

Constructor Summary

Constructors

Constructor	Description
I2PDatagramMaker()	Construct a new I2PDatagramMaker that is null.
I2PDatagramMaker(I2PSession session)	Construct a new I2PDatagramMaker that will be able to create I2P repliable datagrams going to be sent through the specified I2PSession.

Method Summary

Modifier and Type	Method	Description
byte[]	makeI2PDatagram(byte[] payload)	Make a repliable I2P datagram containing the specified payload.
void	setI2PDatagramMaker(I2PSession session)	Does NOT support LS2 offline keys!

Methods inherited from class java.lang.Object

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

Constructor Details

I2PDatagramMaker

public I2PDatagramMaker(I2PSession session)

Construct a new I2PDatagramMaker that will be able to create I2P repliable datagrams going to be sent through the specified I2PSession. Does NOT support LS2 offline keys!

Parameters:

session - I2PSession used to send I2PDatagrams through

Throws:

IllegalArgumentException - if session has offline keys

I2PDatagramMaker

public I2PDatagramMaker()

Construct a new I2PDatagramMaker that is null. Use setI2PDatagramMaker to set the parameters.

Method Details

setI2PDatagramMaker

public void setI2PDatagramMaker(I2PSession session)

Does NOT support LS2 offline keys!

Parameters:

session - I2PSession used to send I2PDatagrams through

Throws:

IllegalArgumentException - if session has offline keys

makeI2PDatagram

public byte[] makeI2PDatagram(byte[] payload)

Make a repliable I2P datagram containing the specified payload. Format is:

1. Destination (387+ bytes)
2. Signature (40+ bytes, type and length as implied by signing key type in the Destination)
3. Payload

Maximum datagram size is 32768, so maximum payload size is 32341, or less for non-DSA_SHA1 destinations. Practical maximum is a few KB less due to ElGamal/AES overhead. 10 KB or less is recommended for best results. For DSA_SHA1 Destinations, the signature is of the SHA-256 Hash of the payload. As of 0.9.14, for non-DSA_SHA1 Destinations, the signature is of the payload itself.

Parameters:

payload - non-null Bytes to be contained in the I2P datagram.

Returns:

null on error

Throws:

IllegalArgumentException - if payload is too big

IllegalStateException - if Destination signature type unsupported