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Fix off by one error in main shared secret generation loop

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* ephemeral pub key, shared secret, and blinding factor we not being
calculated for the final exit node
This commit is contained in:
Olaoluwa Osuntokun 2015-10-24 13:22:24 -07:00
parent fe98fecebe
commit 8b88400ec5
1 changed files with 2 additions and 2 deletions
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4
sphinx.go
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@ -112,7 +112,7 @@ func NewMixHeader(dest LightningAddress, identifier [securityParameter]byte,
// Now recursively compute the ephemeral ECDH pub keys, the shared
// secret, and blinding factor for each hop.
for i := 1; i < numHops-1; i++ {
for i := 1; i <= numHops-1; i++ {
// a_{n} = a_{n-1} x c_{n-1} -> (Y_prev_pub_key x prevBlindingFactor)
hopEphemeralPubKeys[i] = blindGroupElement(hopEphemeralPubKeys[i-1],
hopBlindingFactors[i-1][:])
@ -472,7 +472,7 @@ func (s *SphinxNode) ProcessForwardingMessage(fwdMsg *ForwardingMessage) (*proce
var nextHop [securityParameter]byte
copy(nextHop[:], hopInfo[:securityParameter])
// MAC and MixHeader for th next hop.
// MAC and MixHeader for the next hop.
var nextMac [securityParameter]byte
copy(nextMac[:], hopInfo[securityParameter:securityParameter*2])
var nextMixHeader [routingInfoSize]byte