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Adding comments for MixHeader, create New method

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This commit is contained in:
Olaoluwa Osuntokun
2015-10-17 14:55:19 -07:00
parent 037b1f47ee
commit 1b98267ca4
1 changed files with 17 additions and 8 deletions
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25
sphinx.go
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@@ -61,16 +61,25 @@ type SharedSecret [sharedSecretSize]byte
var zeroNode [securityParameter]byte var zeroNode [securityParameter]byte
var nullDest byte var nullDest byte
// MixHeader... // MixHeader is the onion wrapped hop-to-hop routing information neccessary to
// propagate a message through the mix-net without intermediate nodes having
// knowledge of their position within the route, the source, the destination,
// and finally the identities of the past/future nodes in the route. At each hop
// the ephemeral key is used by the node to perform ECDH between itself and the
// source node. This derived secret key is used to check the MAC of the entire mix
// header, decrypt the next set of routing information, and re-randomize the
// ephemeral key for the next node in the path. This per-hop re-randomization
// allows us to only propgate a single group element through the onion route.
// TODO(roasbeef): serialize/deserialize methods..
type MixHeader struct { type MixHeader struct {
DHKey *btcec.PublicKey EphemeralKey *btcec.PublicKey
RoutingInfo [routingInfoSize]byte RoutingInfo [routingInfoSize]byte
HeaderMAC [securityParameter]byte HeaderMAC [securityParameter]byte
} }
// GenerateSphinxHeader... // GenerateSphinxHeader...
// TODO(roasbeef): or pass in identifiers as payment path? have map from id -> pubkey // TODO(roasbeef): or pass in identifiers as payment path? have map from id -> pubkey
func GenerateSphinxHeader(dest []byte, identifier [securityParameter]byte, func NewMixHeader(dest []byte, identifier [securityParameter]byte,
paymentPath []*btcec.PublicKey) (*MixHeader, [][sharedSecretSize]byte, error) { paymentPath []*btcec.PublicKey) (*MixHeader, [][sharedSecretSize]byte, error) {
// Each hop performs ECDH with our ephemeral key pair to arrive at a // Each hop performs ECDH with our ephemeral key pair to arrive at a
// shared secret. Additionally, each hop randomizes the group element // shared secret. Additionally, each hop randomizes the group element
@@ -171,9 +180,9 @@ func GenerateSphinxHeader(dest []byte, identifier [securityParameter]byte,
var r [routingInfoSize]byte var r [routingInfoSize]byte
copy(r[:], mixHeader) copy(r[:], mixHeader)
header := &MixHeader{ header := &MixHeader{
DHKey: hopEphemeralPubKeys[0], EphemeralKey: hopEphemeralPubKeys[0],
RoutingInfo: r, RoutingInfo: r,
HeaderMAC: headerMac, HeaderMAC: headerMac,
} }
return header, hopSharedSecrets, nil return header, hopSharedSecrets, nil