Add support for arbitrary length onion errors#376
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The specification recommends using a length of 256 for onion errors, but it doesn't say that we should reject errors that use a different length. We may want to start creating errors with a bigger length than 256 if we need to transmit more data to the sender. In order to prepare for this, we keep creating 256-bytes onion errors, but allow receiving errors of arbitrary length.
This has been removed from the spec recently, see: lightning/bolts#962
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pm47
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Oct 3, 2022
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The specification recommends using a length of 256 for onion errors, but it doesn't say that we should reject errors that use a different length.
We may want to start creating errors with a bigger length than 256 if we need to transmit more data to the sender. In order to prepare for this, we keep creating 256-bytes onion errors, but allow receiving errors of arbitrary length.
We also remove support for legacy fixed-size onion payloads.