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update routingInfoSize to use the consts

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* Also start using the LightningAddress type as a place holder
This commit is contained in:
Olaoluwa Osuntokun
2015-10-17 17:09:49 -07:00
parent c6d8f6c5f3
commit ada9fc7082
1 changed files with 8 additions and 12 deletions
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20
sphinx.go
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@@ -47,16 +47,12 @@ const (
sharedSecretSize = 32 sharedSecretSize = 32
// node_id + mac + (2*5-1)*32 // node_id + mac + (2*5-1)*32
// 32 + 32 + 288 // 32 + 32 + 288 = 352
routingInfoSize = 352 routingInfoSize = (securityParameter * 2) + (2*numMaxHops-1)*securityParameter
) )
type LnEndpoint string
//type LnAddr btcutil.Address //type LnAddr btcutil.Address
type LnAddr string type LightningAddress []byte
type SharedSecret [sharedSecretSize]byte
var zeroNode [securityParameter]byte var zeroNode [securityParameter]byte
var nullDest byte var nullDest byte
@@ -79,7 +75,7 @@ type MixHeader struct {
// 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 NewMixHeader(dest []byte, identifier [securityParameter]byte, func NewMixHeader(dest LightningAddress, 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
@@ -222,8 +218,8 @@ func generateHeaderPadding(numHops int, sharedSecrets [][sharedSecretSize]byte)
// addressed to the final destination. // addressed to the final destination.
// TODO(roasbeef): serialize/deserialize methods.. // TODO(roasbeef): serialize/deserialize methods..
type ForwardingMessage struct { type ForwardingMessage struct {
header *MixHeader Header *MixHeader
msg [messageSize]byte Msg [messageSize]byte
} }
// NewForwardingMessage generates the a mix header containing the neccessary // NewForwardingMessage generates the a mix header containing the neccessary
@@ -231,7 +227,7 @@ type ForwardingMessage struct {
// mixnet, eventually reaching the final node specified by 'identifier'. The // mixnet, eventually reaching the final node specified by 'identifier'. The
// onion encrypted message payload is then to be delivered to the specified 'dest' // onion encrypted message payload is then to be delivered to the specified 'dest'
// address. // address.
func NewForwardingMessage(route []*btcec.PublicKey, dest LnAddr, func NewForwardingMessage(route []*btcec.PublicKey, dest LightningAddress,
identifier [securityParameter]byte, message []byte) (*ForwardingMessage, error) { identifier [securityParameter]byte, message []byte) (*ForwardingMessage, error) {
routeLength := len(route) routeLength := len(route)
@@ -263,7 +259,7 @@ func NewForwardingMessage(route []*btcec.PublicKey, dest LnAddr,
onion = lionessEncode(generateKey("pi", secrets[i]), onion) onion = lionessEncode(generateKey("pi", secrets[i]), onion)
} }
return &ForwardingMessage{header: mixHeader, msg: onion}, nil return &ForwardingMessage{Header: mixHeader, Msg: onion}, nil
} }
// calcMac calculates HMAC-SHA-256 over the message using the passed secret key as // calcMac calculates HMAC-SHA-256 over the message using the passed secret key as