e810ecff7c
The `taproot_control_block` did not properly detect whether it deals with script spend or key spend. As a result, if key spend with annex was used it'd return the first element (the signature) as if it was a control block. Further, the conditions identifying which kind of spend it was were repeated multiple times but behaved subtly differently making only `taproot_control_block` buggy but the other places confusing. To resolve these issues this change adds a `P2TrSpend` enum that represents a parsed witness and has a single method doing all the parsing. The other methods can then be trivially implemented by matching on that type. This way only one place needs to be verified and the parsing code is more readable since it uses one big `match` to handle all possibilities. The downside of this is a potential perf impact if the parsing code doesn't get inlined since the common parsing code has to shuffle around data that the caller is not intersted in. I don't think this will be a problem but if it will I suppose it will be solvable (e.g. by using `#[inline(always)]`). The enum also looks somewhat nice and perhaps downstream consumers could make use of it. This change does not expose it yet but is written such that after exposing it the API would be (mostly) idiomatic. Closes #4097 |
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