# Package net.i2p.client.datagram

Provides a standard way for reading and writing messages transferred over I2P so that the recipient has an authenticated mechanism to reply to it.

See: Description

- Class Summary
  Class | Description
  --- | ---
  I2PDatagramDissector | Class for dissecting I2P repliable datagrams, checking the authenticity of the sender.
  I2PDatagramMaker | Class for creating I2P repliable datagrams.

- Exception Summary
  Exception | Description
  --- | ---
  I2PInvalidDatagramException | Exception thrown when I2P repliable datagram signature verification fails.

## Package net.i2p.client.datagram Description

Provides a standard way for reading and writing messages transferred over I2P so that the recipient has an authenticated mechanism to reply to it. This is necessary because the base I2P message sent through `I2PSession.sendMessage(net.i2p.data.Destination, byte[])` has no "from" address, and simply providing a raw "from" address would be insecure as it could be spoofed. An application that needs to know for certain who sent a message to them should use the `I2PDatagramDissector` to parse the raw message received from the `I2PSession`, and in turn, use the `I2PDatagramMaker` to build a message that can be parsed.

The datagram format implemented here includes the sender's `Destination`, the payload, and a hash of the payload (signed by the sender's `SigningPrivateKey`).