java.lang.Object
net.i2p.router.tunnel.OutboundGatewayProcessor
class OutboundGatewayProcessorextends Object
Turn the preprocessed tunnel data into something that can be delivered to the first hop in the tunnel. The crypto used in this class is also used by the InboundEndpointProcessor, as it's the same 'undo' function of the tunnel crypto.

  • Field Details

    • _context

      private final I2PAppContext _context
      The router context the tunnel runs in.

    • _config

      private final TunnelCreatorConfig _config
      The tunnel this processor runs.

  • Constructor Details

    • OutboundGatewayProcessor

      public OutboundGatewayProcessor(I2PAppContext ctx, TunnelCreatorConfig cfg)
      Binds the router context and tunnel creator config.
      Parameters:
      ctx - the router context supplying the AES engine used for the crypto
      cfg - the tunnel creator config describing the hops to undo the crypto for

  • Method Details

    • process

      public void process(byte[] orig, int offset, int length)
      Pick a random IV and wrap the preprocessed data so that it will be exposed at the endpoint - we are the outbound gateway.
      Parameters:
      orig - original data with an extra 16 byte IV prepended.
      offset - index into the array where the extra 16 bytes (IV) begins
      length - how much of orig can we write to (must be a multiple of 16). Should always be 1024 bytes.

    • decrypt

      private void decrypt(TunnelCreatorConfig cfg, byte[] orig, int offset, int length)
      Iteratively undo the crypto that the various layers in the tunnel added. This is used by the outbound gateway (preemptively undoing the crypto peers will add).
      Parameters:
      cfg - the tunnel config whose layers to undo
      orig - original data with an extra 16 byte IV prepended.
      offset - index into the array where the extra 16 bytes (IV) begins
      length - how much of orig can we write to (must be a multiple of 16). Should always be 1024 bytes.

    • decrypt

      static void decrypt(I2PAppContext ctx, byte[] orig, int offset, int length, HopConfig config)
      Undo the crypto for a single hop. This is used by both the outbound gateway (preemptively undoing the crypto peers will add) and by the inbound endpoint.
      Parameters:
      ctx - the router context providing the AES engine used for the decryption
      orig - original data with an extra 16 byte IV prepended.
      offset - index into the array where the extra 16 bytes (IV) begins
      length - how much of orig can we write to (must be a multiple of 16). Should always be 1024 bytes.
      config - the hop config supplying the IV key and the layer key for this hop