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noise: store clamped key instead of raw key

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This commit is contained in:
Jason A. Donenfeld 2019-02-03 22:00:36 +01:00
parent a5ca02d79a
commit 3af9aa88a3
2 changed files with 11 additions and 7 deletions
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12
noise-helpers.go
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@ -78,12 +78,14 @@ func setZero(arr []byte) {
}
}
func newPrivateKey() (sk NoisePrivateKey, err error) {
// clamping: https://cr.yp.to/ecdh.html
_, err = rand.Read(sk[:])
func (sk *NoisePrivateKey) clamp() {
sk[0] &= 248
sk[31] &= 127
sk[31] |= 64
sk[31] = (sk[31] & 127) | 64
}
func newPrivateKey() (sk NoisePrivateKey, err error) {
_, err = rand.Read(sk[:])
sk.clamp()
return
}

6
noise-types.go
View file

@ -45,8 +45,10 @@ func (key NoisePrivateKey) Equals(tar NoisePrivateKey) bool {
return subtle.ConstantTimeCompare(key[:], tar[:]) == 1
}
func (key *NoisePrivateKey) FromHex(src string) error {
return loadExactHex(key[:], src)
func (key *NoisePrivateKey) FromHex(src string) (err error) {
err = loadExactHex(key[:], src)
key.clamp()
return
}
func (key NoisePrivateKey) ToHex() string {