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sm2: refactoring, reduce duplicated codes

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Sun Yimin 2022-08-25 16:54:30 +08:00 committed by GitHub
parent 8948bdd931
commit d1e4806e06
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2 changed files with 28 additions and 18 deletions
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18
sm2/sm2ec/sm2ec.go
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@ -175,21 +175,3 @@ func (curve *sm2Curve) UnmarshalCompressed(data []byte) (x, y *big.Int) {
}
return curve.pointToAffine(p)
}
// Inverse, implements invertible interface, used by Sign()
func (curve *sm2Curve) Inverse(k *big.Int) *big.Int {
if k.Sign() < 0 {
// This should never happen.
k = new(big.Int).Neg(k)
}
if k.Cmp(curve.params.N) >= 0 {
// This should never happen.
k = new(big.Int).Mod(k, curve.params.N)
}
scalar := k.FillBytes(make([]byte, 32))
inverse, err := _sm2ec.P256OrdInverse(scalar)
if err != nil {
panic("sm2/elliptic: sm2 rejected normalized scalar")
}
return new(big.Int).SetBytes(inverse)
}

28
sm2/sm2ec/sm2ec_asm.go Normal file
View File

@ -0,0 +1,28 @@
//go:build (amd64 && !generic) || (arm64 && !generic)
// +build amd64,!generic arm64,!generic
package sm2ec
import (
"math/big"
_sm2ec "github.com/emmansun/gmsm/internal/sm2ec"
)
// Inverse, implements invertible interface, used by Sign()
func (curve *sm2Curve) Inverse(k *big.Int) *big.Int {
if k.Sign() < 0 {
// This should never happen.
k = new(big.Int).Neg(k)
}
if k.Cmp(curve.params.N) >= 0 {
// This should never happen.
k = new(big.Int).Mod(k, curve.params.N)
}
scalar := k.FillBytes(make([]byte, 32))
inverse, err := _sm2ec.P256OrdInverse(scalar)
if err != nil {
panic("sm2/elliptic: sm2 rejected normalized scalar")
}
return new(big.Int).SetBytes(inverse)
}