Package net.i2p.client.datagram

Class I2PDatagramDissector

java.lang.Object
net.i2p.client.datagram.I2PDatagramDissector
public final class I2PDatagramDissector
extends Object
Class for dissecting I2P repliable datagrams, checking the authenticity of the sender. Note that objects of this class are NOT THREAD SAFE!
Author:
human

  • Constructor Summary

    Constructors 
    Constructor Description
    I2PDatagramDissector()
    Crate a new I2P repliable datagram dissector.

  • Method Summary

    Modifier and Type Method Description
    Hash extractHash()
    Extract the hash of the payload of an I2P repliable datagram (previously loaded with the loadI2PDatagram() method), without verifying the datagram signature.
    byte[] extractPayload()
    Extract the payload carried by an I2P repliable datagram (previously loaded with the loadI2PDatagram() method), without verifying the datagram signature.
    Destination extractSender()
    Extract the sender of an I2P repliable datagram (previously loaded with the loadI2PDatagram() method), without verifying the datagram signature.
    Hash getHash()
    Extract the hash of the payload of an I2P repliable datagram (previously loaded with the loadI2PDatagram() method), verifying the datagram signature.
    byte[] getPayload()
    Get the payload carried by an I2P repliable datagram (previously loaded with the loadI2PDatagram() method), verifying the datagram signature.
    Destination getSender()
    Get the sender of an I2P repliable datagram (previously loaded with the loadI2PDatagram() method), verifying the datagram signature.
    void loadI2PDatagram​(byte[] dgram)
    Load an I2P repliable datagram into the dissector.
    void verifySignature()
    Verify the signature of this datagram (previously loaded with the loadI2PDatagram() method)

    Methods inherited from class java.lang.Object

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

  • Constructor Details

  • Method Details

    • loadI2PDatagram

      public void loadI2PDatagram​(byte[] dgram) throws DataFormatException
      Load an I2P repliable datagram into the dissector. Does NOT verify the signature. Format is:
      1. Destination (387+ bytes)
      2. Signature (40+ bytes, type and length as implied by signing key type in the Destination)
      3. Payload
      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:
      dgram - non-null I2P repliable datagram to be loaded
      Throws:
      DataFormatException - If there's an error in the datagram format

    • getPayload

      public byte[] getPayload() throws I2PInvalidDatagramException
      Get the payload carried by an I2P repliable datagram (previously loaded with the loadI2PDatagram() method), verifying the datagram signature.
      Returns:
      A byte array containing the datagram payload
      Throws:
      I2PInvalidDatagramException - if the signature verification fails

    • getSender

      public Destination getSender() throws I2PInvalidDatagramException
      Get the sender of an I2P repliable datagram (previously loaded with the loadI2PDatagram() method), verifying the datagram signature.
      Returns:
      The Destination of the I2P repliable datagram sender
      Throws:
      I2PInvalidDatagramException - if the signature verification fails

    • getHash

      public Hash getHash() throws I2PInvalidDatagramException
      Extract the hash of the payload of an I2P repliable datagram (previously loaded with the loadI2PDatagram() method), verifying the datagram signature. As of 0.9.14, for signature types other than DSA_SHA1, this returns null.
      Returns:
      The hash of the payload of the I2P repliable datagram
      Throws:
      I2PInvalidDatagramException - if the signature verification fails

    • extractPayload

      public byte[] extractPayload()
      Extract the payload carried by an I2P repliable datagram (previously loaded with the loadI2PDatagram() method), without verifying the datagram signature.
      Returns:
      A byte array containing the datagram payload

    • extractSender

      public Destination extractSender()
      Extract the sender of an I2P repliable datagram (previously loaded with the loadI2PDatagram() method), without verifying the datagram signature.
      Returns:
      The Destination of the I2P repliable datagram sender

    • extractHash

      public Hash extractHash()
      Extract the hash of the payload of an I2P repliable datagram (previously loaded with the loadI2PDatagram() method), without verifying the datagram signature. As of 0.9.14, for signature types other than DSA_SHA1, this returns null.
      Returns:
      The hash of the payload of the I2P repliable datagram

    • verifySignature

      public void verifySignature() throws I2PInvalidDatagramException
      Verify the signature of this datagram (previously loaded with the loadI2PDatagram() method)
      Throws:
      I2PInvalidDatagramException - if the signature is invalid