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crypto/dsa: change bitwise checks to mod operations

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Even though bitwise operations may be slightly more
performant, the readability improvement of a mod
operation is worth the tradeoff.

Change-Id: I352c92ad355c6eb6ef99e3da00e1eff2d2ea5812
Reviewed-on: https://go-review.googlesource.com/c/go/+/204739
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Katie Hockman 2019-11-01 11:15:44 -04:00
parent 8de0bb77eb
commit dc0c23ec9d
1 changed files with 2 additions and 2 deletions
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4
src/crypto/dsa/dsa.go
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@ -202,7 +202,7 @@ func Sign(rand io.Reader, priv *PrivateKey, hash []byte) (r, s *big.Int, err err
// FIPS 186-3, section 4.6
n := priv.Q.BitLen()
if priv.Q.Sign() <= 0 || priv.P.Sign() <= 0 || priv.G.Sign() <= 0 || priv.X.Sign() <= 0 || n&7 != 0 {
if priv.Q.Sign() <= 0 || priv.P.Sign() <= 0 || priv.G.Sign() <= 0 || priv.X.Sign() <= 0 || n%8 != 0 {
err = ErrInvalidPublicKey
return
}
@ -281,7 +281,7 @@ func Verify(pub *PublicKey, hash []byte, r, s *big.Int) bool {
w := new(big.Int).ModInverse(s, pub.Q)
n := pub.Q.BitLen()
if n&7 != 0 {
if n%8 != 0 {
return false
}
z := new(big.Int).SetBytes(hash)