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lnwallet: integrate obfuscated state hints into funding workflow

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This commit finalizes the implementation of #58 by integrating passing
around the obfuscate state hints into the funding workflow of the
wallet, and also the daemon’s funding manager.

In order to amend the tests, the functions to set and receive the state
hints are now publicly exported.
This commit is contained in:
Olaoluwa Osuntokun
2016-11-16 12:54:27 -08:00
parent 3010412bbc
commit 22074eb737
6 changed files with 147 additions and 34 deletions
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9
lnwallet/script_utils.go
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@@ -772,14 +772,15 @@ func deriveElkremRoot(elkremDerivationRoot *btcec.PrivateKey,
return elkremRoot
}
// setStateNumHint encodes the current state number within the passed
// SetStateNumHint encodes the current state number within the passed
// commitment transaction by re-purposing the sequence fields in the input of
// the commitment transaction to encode the obfuscated state number. The state
// number is encoded using 31-bits of the sequence number, with the top bit set
// in order to disable BIP0068 (sequence locks) semantics. Finally before
// encoding, the obfuscater is XOR'd against the state number in order to hide
// the exact state number from the PoV of outside parties.
func setStateNumHint(commitTx *wire.MsgTx, stateNum uint32,
// TODO(roasbeef): unexport function after bobNode is gone
func SetStateNumHint(commitTx *wire.MsgTx, stateNum uint32,
obsfucator [StateHintSize]byte) error {
// With the current schema we are only able able to encode state num
@@ -809,13 +810,13 @@ func setStateNumHint(commitTx *wire.MsgTx, stateNum uint32,
return nil
}
// getStateNumHint recovers the current state number given a commitment
// GetStateNumHint recovers the current state number given a commitment
// transaction which has previously had the state number encoded within it via
// setStateNumHint and a shared obsfucator.
//
// See setStateNumHint for further details w.r.t exactly how the state-hints
// are encoded.
func getStateNumHint(commitTx *wire.MsgTx, obsfucator [StateHintSize]byte) uint32 {
func GetStateNumHint(commitTx *wire.MsgTx, obsfucator [StateHintSize]byte) uint32 {
// Convert the obfuscater into a uint32, this will be used to
// de-obfuscate the final recovered state number.
xorInt := binary.BigEndian.Uint32(obsfucator[:]) & (^wire.SequenceLockTimeDisabled)