smite: add is_standard_shutdown_script helper - #186
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BOLT-02 specifies sender requirements for shutdown scripts. They must be witness v0 (P2WPKH, P2WSH) or following features must be negotiated: * `option_shutdown_anysegwit`: witness v1-v16 with a 2..=40 byte program * `option_simple_close`: `OP_RETURN` with a single data push of 6..=80 bytes Legacy scripts (P2PKH, P2SH) may be accepted for backward compatibility. This applies to the `shutdown` and `closing_complete` messages, and the `upfront_shutdown_script` TLV in the `open_channel`, `open_channel2`, `accept_channel` and `accept_channel2` messages. This commit adds a helper to catch targets that don't comply with the spec.
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From the commit message:
As per the note I added to the code, I'm not sure if the fuzzer should also reject legacy scripts, since a target must not send them.
I haven't wired this into existing code or #163 yet, but I thought the introduction of the helper might be worthwile to review itself, especially considering the question wrt legacy scripts.