This updates the no-cgo implementations in the crypto package to use
the github.com/btcsuite/btcd/btcec/v2 module instead of the older btcec
package that was part of the main github.com/btcsuite/btcd module.
name old time/op new time/op delta
EcrecoverSignature-32 198µs ± 0% 144µs ± 0% -27.11%
VerifySignature-32 177µs ± 0% 128µs ± 0% -27.44%
DecompressPubkey-32 20.9µs ± 0% 10.1µs ± 0% -51.51%
Use (*ModNScalar).IsOverHalfOrder instead of math/big.Int when checking
for malleable signatures.
Package crypto works with or without cgo, which is great. However, to make it
work without cgo required setting the build tag `nocgo`. It's common to disable
cgo by instead just setting the environment variable `CGO_ENABLED=0`. Setting
this environment variable does _not_ implicitly set the build tag `nocgo`. So
projects that try to build the crypto package with `CGO_ENABLED=0` will fail. I
have done this myself several times. Until today, I had just assumed that this
meant that this package requires cgo.
But a small build tag change will make this case work. Instead of using `nocgo`
and `!nocgo`, we can use `!cgo` and `cgo`, respectively. The `cgo` build tag is
automatically set if cgo is enabled, and unset if it is disabled.
* crypto: ensure that VerifySignature rejects malleable signatures
It already rejected them when using libsecp256k1, make sure the nocgo
version does the same thing.
* crypto: simplify check
* crypto: fix build
We need those operations for p2p/enr.
Also upgrade github.com/btcsuite/btcd/btcec to the latest version
and improve BenchmarkSha3. The benchmark printed extra output
that confused tools like benchstat and ignored N.
