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fix defect

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This commit is contained in:
Sun Yimin 2022-08-25 12:54:59 +08:00 committed by GitHub
parent eedd5ebc2b
commit 7ebdf00640
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 4 additions and 8 deletions
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6
sm2/sm2.go
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@ -337,8 +337,7 @@ func Encrypt(random io.Reader, pub *ecdsa.PublicKey, msg []byte, opts *Encrypter
//A5, calculate t=KDF(x2||y2, klen)
var kdfCount int = 0
c2 := kdf.Kdf(sm3.New(), append(toBytes(curve, x2), toBytes(curve, y2)...), msgLen)
success := subtle.ConstantTimeAllZero(c2)
if !success {
if subtle.ConstantTimeAllZero(c2) {
kdfCount++
if kdfCount > maxRetryLimit {
return nil, fmt.Errorf("sm2: A5, failed to calculate valid t, tried %v times", kdfCount)
@ -399,8 +398,7 @@ func rawDecrypt(priv *PrivateKey, x1, y1 *big.Int, c2, c3 []byte) ([]byte, error
x2, y2 := curve.ScalarMult(x1, y1, priv.D.Bytes())
msgLen := len(c2)
msg := kdf.Kdf(sm3.New(), append(toBytes(curve, x2), toBytes(curve, y2)...), msgLen)
success := subtle.ConstantTimeAllZero(c2)
if !success {
if subtle.ConstantTimeAllZero(c2) {
return nil, errors.New("sm2: invalid cipher text")
}

6
sm9/sm9.go
View File

@ -228,8 +228,7 @@ func WrapKey(rand io.Reader, pub *EncryptMasterPublicKey, uid []byte, hid byte,
buffer = append(buffer, uid...)
key = kdf.Kdf(sm3.New(), buffer, kLen)
ok = subtle.ConstantTimeAllZero(key)
if ok {
if !subtle.ConstantTimeAllZero(key) {
break
}
}
@ -300,8 +299,7 @@ func UnwrapKey(priv *EncryptPrivateKey, uid []byte, cipher *bn256.G1, kLen int)
buffer = append(buffer, uid...)
key := kdf.Kdf(sm3.New(), buffer, kLen)
ok := subtle.ConstantTimeAllZero(key)
if !ok {
if subtle.ConstantTimeAllZero(key) {
return nil, errors.New("sm9: invalid cipher")
}
return key, nil