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secp256k1: Store constant on stack instead of heap.

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This modifies the constant that houses the order as a field val to store
it on the stack instead of the heap to save an unnecessary allocation.
This commit is contained in:
Dave Collins 2022-07-23 23:40:25 -05:00
parent d567e996ce
commit 712c80da10
No known key found for this signature in database
GPG Key ID: B8904D9D9C93D1F2
1 changed files with 4 additions and 4 deletions
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8
dcrec/secp256k1/ecdsa/signature.go
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@ -29,10 +29,10 @@ var (
// orderAsFieldVal is the order of the secp256k1 curve group stored as a
// field value. It is provided here to avoid the need to create it multiple
// times.
orderAsFieldVal = func() *secp256k1.FieldVal {
orderAsFieldVal = func() secp256k1.FieldVal {
var f secp256k1.FieldVal
f.SetByteSlice(secp256k1.Params().N.Bytes())
return &f
return f
}()
)
@ -282,7 +282,7 @@ func (sig *Signature) Verify(hash []byte, pubKey *secp256k1.PublicKey) bool {
// Step 10.
//
// Verified if (R + N) * z == X.x (mod P)
sigRModP.Add(orderAsFieldVal)
sigRModP.Add(&orderAsFieldVal)
result.Mul2(&sigRModP, z).Normalize()
return result.Equals(&X.X)
}
@ -919,7 +919,7 @@ func RecoverCompact(signature, hash []byte) (*secp256k1.PublicKey, bool, error)
// Step 3.2.
//
// r = r + N (mod P)
fieldR.Add(orderAsFieldVal)
fieldR.Add(&orderAsFieldVal)
}
// Step 4.