Co-authored-by: Matt Kocubinski <mkocubinski@gmail.com>
Co-authored-by: Marko <marbar3778@yahoo.com>
Co-authored-by: samricotta <37125168+samricotta@users.noreply.github.com>
Co-authored-by: Julien Robert <julien@rbrt.fr>
## Description
closing in on completion of linting
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## Description
fix various linting issues
---
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## Description
this pr fixes a integer conversion lint issue.
---
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Noticed while examining a bunch of profiles, that the for loop inside
(*CompactBitArry).NumTrueBitsBefore unnecessarily consumed a bunch of
time:
```shell
7.55s 9.88s (flat, cum) 93.38% of Total
240ms 250ms 88:func (bA *CompactBitArray) NumTrueBitsBefore(index int) int {
. . 89: onesCount := 0
70ms 340ms 90: max := bA.Count()
70ms 70ms 91: if index > max {
. . 92: index = max
. . 93: }
. . 94: // below we iterate over the bytes then over bits (in low endian) and count bits set to 1
2.54s 2.76s 95: for elem := 0; elem < len(bA.Elems); elem++ {
```
but we can use the native for loop that produces indices while iterating
over slices. Just by simply changing the form results in an improvement
```shell
7.50s 9.95s (flat, cum) 94.94% of Total
240ms 320ms 88:func (bA *CompactBitArray) NumTrueBitsBefore(index int) int {
. . 89: onesCount := 0
170ms 420ms 90: max := bA.Count()
90ms 100ms 91: if index > max {
. . 92: index = max
. . 93: }
. . 94: // below we iterate over the bytes then over bits (in low endian) and count bits set to 1
1.49s 1.62s 95: for elem := range bA.Elems {
```
and an improvement in CPU time
```shell
$ benchstat before.txt after.txt
name old time/op new time/op delta
NumTrueBitsBefore/new-8 13.3ns ± 1% 12.5ns ± 1% -6.07% (p=0.000 n=10+10)
name old alloc/op new alloc/op delta
NumTrueBitsBefore/new-8 0.00B 0.00B ~ (all equal)
name old allocs/op new allocs/op delta
NumTrueBitsBefore/new-8 0.00 0.00 ~ (all equal)
```
Fixes#13999
## Description
TLDR; check for `s.IsOverHalfOrder()` with less steps
Before this PR:
```go
// parse the signature:
signature := signatureFromBytes(sigStr)
// Reject malleable signatures. libsecp256k1 does this check but btcec doesn't.
// see: f9401ae011/crypto/signature_nocgo.go (L90-L93)
// Serialize() would negate S value if it is over half order.
// Hence, if the signature is different after Serialize() if should be rejected.
modifiedSignature, parseErr := ecdsa.ParseDERSignature(signature.Serialize())
if parseErr != nil {
return false
}
if !signature.IsEqual(modifiedSignature) {
return false
}
```
It's serializing the signature into a new variable and then comparing if both are equal. Inside `Serialize()` we have:
5d537320a0/dcrec/secp256k1/ecdsa/signature.go (L88-L95)
```go
// Ensure the S component of the signature is less than or equal to the half
// order of the group because both S and its negation are valid signatures
// modulo the order, so this forces a consistent choice to reduce signature
// malleability.
sigS := new(secp256k1.ModNScalar).Set(&sig.s)
if sigS.IsOverHalfOrder() {
sigS.Negate()
}
```
Before btcec update to v2:
Until btcec update this was simpler because S was exported in the signature: ed9cd41396 (diff-30a6b594e157a12a28bf8a26f65ab4de1dc3c65c8419e5756f0b9c25d9ce1a93L46)
```go
if signature.S.Cmp(secp256k1halfN) > 0 {
return false
}
```
Closes: #XXXX
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