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crypto/ecdsa: draw a fixed amount of entropy while signing

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Emman 2021-12-15 08:47:04 +08:00
parent 54ee9c6f5e
commit b2713b5e0d
1 changed files with 3 additions and 6 deletions
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9
sm2/sm2.go
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@ -569,12 +569,9 @@ func Sign(rand io.Reader, priv *ecdsa.PrivateKey, hash []byte) (r, s *big.Int, e
} }
maybeReadByte(rand) maybeReadByte(rand)
// Get min(log2(q) / 2, 256) bits of entropy from rand. // Get 256 bits of entropy from rand.
entropylen := (priv.Curve.Params().BitSize + 7) / 16 entropy := make([]byte, 32)
if entropylen > 32 {
entropylen = 32
}
entropy := make([]byte, entropylen)
_, err = io.ReadFull(rand, entropy) _, err = io.ReadFull(rand, entropy)
if err != nil { if err != nil {
return return