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MAGIC - move public key check out of loop

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This commit is contained in:
Emman 2021-02-25 13:37:14 +08:00
parent 2dd11a9e9a
commit 586ab84f33
1 changed files with 4 additions and 5 deletions
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9
sm2/sm2.go
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@ -192,6 +192,10 @@ func Encrypt(random io.Reader, pub *ecdsa.PublicKey, msg []byte, opts *Encrypter
if opts == nil {
opts = &defaultEncrypterOpts
}
//A3, requirement is to check if h*P is infinite point, h is 1
if (pub.X.Sign() == 0 && pub.Y.Sign() == 0) || !curve.IsOnCurve(pub.X, pub.Y) {
return nil, errors.New("SM2: invalid public key")
}
for {
//A1, generate random k
k, err := randFieldElement(curve, random)
@ -203,11 +207,6 @@ func Encrypt(random io.Reader, pub *ecdsa.PublicKey, msg []byte, opts *Encrypter
x1, y1 := curve.ScalarBaseMult(k.Bytes())
c1 := opts.PointMarshalMode.mashal(curve, x1, y1)
//A3, requirement is to check if h*P is infinite point, h is 1
if !curve.IsOnCurve(pub.X, pub.Y) {
return nil, errors.New("SM2: invalid public key")
}
//A4, calculate k * P (point of Public Key)
x2, y2 := curve.ScalarMult(pub.X, pub.Y, k.Bytes())