## Description
closing in on completion of linting
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## Description
this pr fixes a integer conversion lint issue.
---
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## 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: https://github.com/ethereum/go-ethereum/blob/f9401ae011ddf7f8d2d95020b7446c17f8d98dc1/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:
https://github.com/decred/dcrd/blob/5d537320a0fe2357daf444cc12c62680579689da/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: https://github.com/cosmos/cosmos-sdk/commit/ed9cd41396815bd236770f73bb30e083e63e8b64#diff-30a6b594e157a12a28bf8a26f65ab4de1dc3c65c8419e5756f0b9c25d9ce1a93L46
```go
if signature.S.Cmp(secp256k1halfN) > 0 {
return false
}
```
Closes: #XXXX
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- [ ] added a changelog entry to `CHANGELOG.md`
- [ ] included comments for [documenting Go code](https://blog.golang.org/godoc)
- [ ] updated the relevant documentation or specification
- [ ] reviewed "Files changed" and left comments if necessary
- [ ] confirmed all CI checks have passed
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Fixes an oversight that hadn't been considered when the build
guards were added to the other files in the same directory, that
this test requires linking with code that hooks into cgo. This change
adds the build guard
+build cgo
Fixes#13266
seayyyy
Marko
ipangpang
Facundo Medica
Ezequiel Raynaudo
Matt KocubinskiandMarko
Qt
KeienWang
Carlos Santiago Yanzon
Emmanuel T Odeke
Julián ToledanoandMarko
ruthishvitwit
Jacob Gadikian
AmauryandAaron Craelius
Elias NaurandMarko