// Commits reconstructs a list of commits from the given polynomials and indices.
func (pv *PVSS) Commits(polyBin [][]byte, index []int) ([]abstract.Point, error) {
if len(polyBin) != len(index) {
return nil, errors.New("Inputs have different lengths")
}
n := len(polyBin)
sH := make([]abstract.Point, n)
for i := range sH {
P := new(poly.PubPoly)
P.Init(pv.suite, pv.t, pv.h)
if err := P.UnmarshalBinary(polyBin[i]); err != nil {
return nil, err
}
sH[i] = P.Eval(index[i])
}
return sH, nil
}
// Verifies that the Equal method works.
func TestRequestInsuranceEqual(t *testing.T) {
share := prishares.Share(0)
msg := new(RequestInsuranceMessage).createMessage(keyPair.Public, 0,
share, pubCommit)
msgCopy := msg
if !msg.Equal(msgCopy) {
t.Error("Messages should be equal.")
}
// Fails if only the public keys are different.
msg2 := new(RequestInsuranceMessage).createMessage(keyPair2.Public, 0,
share, pubCommit)
if msg.Equal(msg2) {
t.Error("Messages should not be equal.")
}
// Fails if only the share number is different.
msg2 = new(RequestInsuranceMessage).createMessage(keyPair.Public, 1,
share, pubCommit)
if msg.Equal(msg2) {
t.Error("Messages should not be equal.")
}
// Fails if only the shares are different.
msg2 = new(RequestInsuranceMessage).createMessage(keyPair.Public, 0,
prishares.Share(1), pubCommit)
if msg.Equal(msg2) {
t.Error("Messages should not be equal.")
}
pripoly2 := new(poly.PriPoly).Pick(INSURE_GROUP, TSHARES, secret,
random.Stream)
otherPoly := new(poly.PubPoly)
otherPoly.Init(INSURE_GROUP, TSHARES, nil)
otherPoly.Commit(pripoly2, nil)
// Fails if only the public polynomial is different
msg2 = new(RequestInsuranceMessage).createMessage(keyPair.Public, 0,
share, otherPoly)
if msg.Equal(msg2) {
t.Error("Messages should not be equal.")
}
}
func (lp *LifePolicy) TakeOutPolicy(serverList []abstract.Point,
selectInsurers func([]abstract.Point, int) []abstract.Point,
g abstract.Group, t int, n int) (*LifePolicy, bool) {
// If n is less than the expected number of shares to reconstruct the
// secret, fail
if n < t {
return lp, false
}
// Initialize the policy.
// If we have no selectInsurers function, use the basic algorithm.
if selectInsurers == nil {
selectInsurers = selectInsurersBasic
}
lp.insurersList = selectInsurers(serverList, n)
if lp.insurersList == nil || len(lp.insurersList) < n {
return lp, false
}
//TODO: Use bytes maybe?
lp.proofList = new(list.List)
// Create a new polynomial from the private key where t shares are
// needed to reconstruct the secret. Then, split it into secret shares
// and create the public polynomial.
pripoly := new(poly.PriPoly).Pick(g, t, lp.keyPair.Secret, random.Stream)
prishares := new(poly.PriShares).Split(pripoly, n)
pubPoly := new(poly.PubPoly)
pubPoly.Init(g, n, nil)
pubPoly = new(poly.PubPoly).Commit(pripoly, nil)
// Mark the policy as being in the setup stage and ready to begin
// receiving PolicyApproveMessages.
lp.policyStatus = PolicySetup
// Send each share off to the appropriate server.
for i := 0; i < n; i++ {
requestMsg := new(RequestInsuranceMessage).createMessage(
lp.keyPair.Public, i, prishares.Share(i), pubPoly)
lp.cman.Put(lp.insurersList[i],
new(PolicyMessage).createRIMessage(requestMsg))
}
receivedList := make([]bool, len(lp.insurersList))
// TODO: Add a timeout such that this process will end after a certain
// time and a new batch of insurers can be picked.
// TODO: Make it so that it stops as soon as we get R other insurers
// for t <= r <= n
for lp.proofList.Len() < n {
for i := 0; i < n; i++ {
// If we have already received a certificate for this
// node, move on.
if receivedList[i] == true {
continue
}
msg := new(PolicyMessage)
lp.cman.Get(lp.insurersList[i], msg)
msgType, err := lp.handlePolicyMessage(msg)
// Merely for efficiency, to update the receive list.
if msgType == PolicyApproved {
receivedList[i] = (err == nil)
}
}
}
lp.policyStatus = PolicyReady
return lp, true
}
// Used to initialize the public commit polynomial.
func producePubPoly() *poly.PubPoly {
testPubPoly := new(poly.PubPoly)
testPubPoly.Init(INSURE_GROUP, n, nil)
return testPubPoly.Commit(pripoly, nil)
}