74c77825e5ab68bfa575dad86444506c43ef6c06 test: Unit test for inferring scripts with hybrid and uncompressed keys (Andrew Chow)
f895f97014ac5fac46d27725c1ea7decf7ff76d4 test: Scripts with hybrid pubkeys are migrated to watchonly (Andrew Chow)
37b9b734770e855b9beff3b5085125f1420dd072 descriptors: Move InferScript's pubkey validity checks to InferPubkey (Andrew Chow)
b7485f11ab3a0f1860b261f222362af3301e0781 descriptors: Check result of InferPubkey (Andrew Chow)
Pull request description:
`InferDescriptor` was not always checking that the pubkey it was placing into the descriptor was an allowed pubkey. For example, given a P2WPKH script that uses an uncompressed pubkey, it would produce a `wpkh()` with the uncompressed key. Additionally, the hybrid key check was only being done for `pk()` scripts, where it should've been done for all scripts.
This PR moves the key checking into `InferPubkey`. If the key is not valid for the context, then `nullptr` is returned and the inferring will fall through to the defaults of either `raw()` or `addr()`.
This also resolves an issue with migrating legacy wallets that contain hybrid pubkeys as such watchonly scripts will become `raw()` or `addr()` and go to the watchonly wallet. Note that a legacy wallet cannot sign for hybrid pubkeys. A test has been added for the migration case.
Also added unit tests for `InferDescriptor` itself as the edge cases with that function are not covered by the descriptor roundtrip test.
ACKs for top commit:
furszy:
ACK 74c77825
Sjors:
utACK 74c77825e5ab68bfa575dad86444506c43ef6c06
Tree-SHA512: ed5f63e42a2e46120245a6b0288b90d2a6912860814c6c08fe393332add1cb364dc5eca72f16980352143570aef0c07bf1a91acd294099463bd028b6ce2fe40c
744157ef1a