Enum ForwardedMetaPacket 

pub enum ForwardedMetaPacket<S: SphinxSuite, H: SphinxHeaderSpec, const P: usize> {
    Relayed {
        packet: MetaPacket<S, H, P>,
        next_node: <S::P as Keypair>::Public,
        path_pos: u8,
        additional_info: H::RelayerData,
        derived_secret: SharedSecret,
        packet_tag: PacketTag,
    },
    Final {
        plain_text: PaddedPayload<P>,
        receiver_data: H::PacketReceiverData,
        derived_secret: SharedSecret,
        packet_tag: PacketTag,
        no_ack: bool,
    },
}

Represent a MetaPacket with one layer of encryption removed, exposing the details about the next hop.

There are two possible states - either the packet is intended for the recipient, and is thus ForwardedMetaPacket::Final, or it is meant to be sent (relayed) to the next hop - thus it is ForwardedMetaPacket::Relayed.

Variants

Relayed

The content is another MetaPacket meant to be sent to the next hop.

Fields

packet: MetaPacket<S, H, P>

Packet for the next hop.

next_node: <S::P as Keypair>::Public

Public key of the next hop.

path_pos: u8

Position in the channel path of this packet.

additional_info: H::RelayerData

Additional data for the relayer.

In HOPR protocol, this contains the PoR challenge that will be solved when we receive the acknowledgement after we forward the inner packet to the next hop.

derived_secret: SharedSecret

Shared secret that was used to encrypt the removed layer.

packet_tag: PacketTag

Packet checksum.

Final

The content is the actual payload for the packet’s destination.

Fields

plain_text: PaddedPayload<P>

Decrypted payload

receiver_data: H::PacketReceiverData

Data for the packet receiver (containing the sender’s pseudonym).

derived_secret: SharedSecret

Shared secret that was used to encrypt the removed layer.

packet_tag: PacketTag

Packet checksum.

no_ack: bool

Special flag used for acknowledgement signaling to the recipient