Class HopProcessor

  • Direct Known Subclasses:
    InboundGatewayProcessor

    class HopProcessor
    extends Object
    Take a received tunnel message, verify that it isn't a duplicate, and translate it into what the next hop will want. The hop processor works the same on all peers - inbound and outbound participants, outbound endpoints, and inbound gateways (with a small modification per InboundGatewayProcessor).
    • Field Detail

      • IV_LENGTH

        static final int IV_LENGTH
        as of i2p 0.6, the tunnel crypto changed to encrypt the IV both before and after using it at each hop so as to prevent a certain type of replay/confirmation attack. See: http://osdir.com/ml/network.i2p/2005-07/msg00031.html
        See Also:
        Constant Field Values
    • Method Detail

      • process

        public boolean process​(byte[] orig,
                               int offset,
                               int length,
                               Hash prev)
        Process the data for the current hop, overwriting the original data with what should be sent to the next peer. This also validates the previous peer and the IV, making sure its not a repeat and not a loop.
        Parameters:
        orig - IV+data of the message
        offset - index into orig where the IV begins
        length - how long after the offset does the IV+message go for? Should always be 1024 bytes.
        prev - previous hop in the tunnel, or null if we are the gateway
        Returns:
        true if the message was updated and valid, false if it was not.