Add support for fulfillment payload #3321
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This adds support for including a payload in `update_fulfill_htlc` that the recipient encrypts for the payer. This can be useful to transmit data atomically with the fulfillment of a payment. The main challenge is that intermediate nodes may drop or tamper with this fulfillment payload, which is why we include it in the HMACs of the attribution data, which lets senders detect which pair of nodes may be malicious. See lightning/bolts#1344
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This adds support for including a payload in
update_fulfill_htlcthat the recipient encrypts for the payer. This can be useful to transmit data atomically with the fulfillment of a payment. The main challenge is that intermediate nodes may drop or tamper with this fulfillment payload, which is why we include it in the HMACs of the attribution data, which lets senders detect which pair of nodes may be malicious.See lightning/bolts#1344 for the detailed specification.
We don't currently include any fulfillment payload when we're the final node, but we correctly relay fulfillment payloads from downstream and correctly decrypt them when we're the sender. When we start including a fulfillment payload as the final node, we should also: