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 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