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Merge bitcoin#19944: Update secp256k1 subtree (including BIP340 support)
b9c1a76 Squashed 'src/secp256k1/' changes from 2ed54da..8ab24e8 (Pieter Wuille) Pull request description: This updates our src/secp256k1 subtree to the latest libsecp256k1 upstream version. As it adds BIP340 support (see bitcoin-core/secp256k1#558), this is a prerequisite for bitcoin#17977. In particular, it contains: * A few generic library improvements * Support for x-only public keys as used by BIP340. * Support for "key pair" objects, making signing more efficient by using a precomputed public key. * Signing support for BIP340 Schnorr (single-party) signatures. * Verification support for BIP340 Schnorr signatures. * Support for verifying tweaked x-only keys, as used by BIP341's Taproot construction. Things that are not included: * MuSig, nor any kind of multisignatures, threshold signatures, ... on top. * Batch verification. * Support for variable-length messages in BIP340 (which are still being discussed, but won't affect BIP341, or Bitcoin Core). * A few more generic improvements that are still in the pipeline, including faster modular inversions. ACKs for top commit: instagibbs: ACK 894fb33 fanquake: ACK 894fb33. Any Valgrind concerns will be addressed upstream, see discussion in bitcoin-core/secp256k1#813, and if necessary, can be pulled into our tree prior to the 0.21.0 branch off. They are not a blocker for merging this PR in it's current state. benthecarman: ACK `894fb33` Tree-SHA512: 6dc992f4477069b7fbd223316f1be955750923be1479c38adad2312649fdca1f316edb375c42ef9d97cea2407caaef49fb8c93abd6c037fe1a522910cbbc2479
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