logos-messaging/noise
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Skip first block when rekeying

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This commit is contained in:
Jonathan Rudenberg 2014-07-13 23:43:55 -07:00
parent d3253d3baa
commit 8f09b6f6b7
1 changed files with 6 additions and 5 deletions
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11
box/box.go
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@ -228,7 +228,7 @@ func (noise255) NewCipher(cc []byte) CipherContext {
type noise255ctx struct {
cc []byte
keystream [104]byte
keystream [168]byte
}
func (n *noise255ctx) Reset(cc []byte) {
@ -264,11 +264,12 @@ func (n *noise255ctx) rekey() {
panic(err)
}
n.cc = n.keystream[64:]
for i := range n.cc {
n.cc[i] = 0
ks := n.keystream[64:]
for i := range ks {
ks[i] = 0
}
c.XORKeyStream(n.cc, n.cc)
c.XORKeyStream(ks, ks)
n.cc = ks[64:]
}
func (n *noise255ctx) mac(keystream, ciphertext, authtext []byte) [16]byte {