Commits on Jan 31, 2022

1. btcec/v2: create new ecdsa package …

   In this commit, we create a new package to house the ECDSA-specific
   logic in the new `btcec/v2` pacakge. Thsi c hange is meant to mirror the
   structure of the `dcrec` package, as we'll soon slot in our own custom
   BIP-340 implementation.

   

   Roasbeef committed Jan 31, 2022
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2. chaincfg: add BIP-340 tagged hash implementation …

   In this commit, we add an implementation of the BIP-340 tagged hash
   scheme. This initial version can be optimized quite a bit, for example,
   we can hard code the output of frequently used `sha256(tag)` values and
   save two `sha256` invocations.

   

   Roasbeef committed Jan 31, 2022
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3. btcec/v2/schnorr: add initial BIP-340 schnorr sig implementation …

   In this commit, we add an initial implementation of BIP-340. Mirroring
   the recently added `ecsda` package, we create a new `schnorr` package
   with a unique `Signature` type and `ParsePubkey` function. The new
   `Signature` type implements the fixed-sized 64-byte signatures, and the
   `ParsePubkey` method only accepts pubkeys that are 32-bytes in length,
   with an implicit sign byte.
   
   The signing implementation by default, deviates from BIP-340 as it opts
   to use rfc6979 deterministic signatures by default, which means callers
   don't need to always pass in their own `auxNonce` randomness. A set of
   functional arguments allows callers to pass in their own value, which is
   the way all the included test vectors function.
   
   The other optional functional argument added is the `FastSign` option
   that allows callers to skip the final step of verifying each signature
   they generate.

   

   Roasbeef committed Jan 31, 2022
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4. build: run go mod tidy to refresh go.sum for btcutil

   

   Roasbeef committed Jan 31, 2022
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5. btcec/schnorr: add benchmarks for sign/verify …

   Benchmarks run w/o fast sign (always verify after you generate a sig):
   ```
   goos: darwin
   goarch: amd64
   pkg: github.com/btcsuite/btcd/btcec/v2/schnorr
   cpu: VirtualApple @ 2.50GHz
   BenchmarkSigVerify-8     	    8000	    152468 ns/op	     960 B/op	      16 allocs/op
   BenchmarkSign-8          	    4939	    215489 ns/op	    1408 B/op	      27 allocs/op
   BenchmarkSignRfc6979-8   	    5106	    217416 ns/op	    2129 B/op	      37 allocs/op
   PASS
   ok  	github.com/btcsuite/btcd/btcec/v2/schnorr	4.629s
   ```
   
   Benchmarks w/ fast sign:
   ```
   goos: darwin
   goarch: amd64
   pkg: github.com/btcsuite/btcd/btcec/v2/schnorr
   cpu: VirtualApple @ 2.50GHz
   BenchmarkSigVerify-8     	    7982	    142826 ns/op	     960 B/op	      16 allocs/op
   BenchmarkSign-8          	   18210	     65908 ns/op	     496 B/op	      12 allocs/op
   BenchmarkSignRfc6979-8   	   16537	     78161 ns/op	    1216 B/op	      22 allocs/op
   PASS
   ok  	github.com/btcsuite/btcd/btcec/v2/schnorr	5.418s
   ```

   

   Roasbeef committed Jan 31, 2022
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6. btcec+chaincfg: use pre-computed tag hash values …

   In this commit, we optimize our signature implementation slightly, by
   defining pre-computed sha256(tag) variables for the commonly used
   values.  If a tag matches this, then we'll use that hash value to avoid
   an extra round of hashing.

   

   Roasbeef committed Jan 31, 2022
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