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sm2: saving some temporary variables

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Sun Yimin 2024-01-30 17:51:13 +08:00 committed by GitHub
parent fe4e699b19
commit aaabb09dac
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
1 changed files with 12 additions and 12 deletions
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24
sm2/sm2.go
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@ -744,20 +744,20 @@ func verifySM2EC(c *sm2Curve, pub *ecdsa.PublicKey, hash, sig []byte) bool {
e := bigmod.NewNat() e := bigmod.NewNat()
hashToNat(c, e, hash) hashToNat(c, e, hash)
// t = [r + s]
t := bigmod.NewNat().Set(r)
t.Add(s, c.N)
if t.IsZero() == 1 {
return false
}
// p₁ = [s]G // p₁ = [s]G
p1, err := c.newPoint().ScalarBaseMult(s.Bytes(c.N)) p1, err := c.newPoint().ScalarBaseMult(s.Bytes(c.N))
if err != nil { if err != nil {
return false return false
} }
// p₂ = [t]Q
p2, err := Q.ScalarMult(Q, t.Bytes(c.N)) // s = [r + s]
s.Add(r, c.N)
if s.IsZero() == 1 {
return false
}
// p₂ = [r+s]Q
p2, err := Q.ScalarMult(Q, s.Bytes(c.N))
if err != nil { if err != nil {
return false return false
} }
@ -768,13 +768,13 @@ func verifySM2EC(c *sm2Curve, pub *ecdsa.PublicKey, hash, sig []byte) bool {
return false return false
} }
v, err := bigmod.NewNat().SetOverflowingBytes(Rx, c.N) _, err = s.SetOverflowingBytes(Rx, c.N)
if err != nil { if err != nil {
return false return false
} }
v.Add(e, c.N) s.Add(e, c.N)
return v.Equal(r) == 1 return s.Equal(r) == 1
} }
// VerifyASN1WithSM2 verifies the signature in ASN.1 encoding format sig of raw msg // VerifyASN1WithSM2 verifies the signature in ASN.1 encoding format sig of raw msg