// TestCosiSignature test if the signature generation is correct,i.e. if we
// can verify the final signature.
func TestCosiSignature(t *testing.T) {
msg := []byte("Hello World Cosi")
nb := 2
cosis := genCosis(nb)
genFinalCosi(cosis, msg)
root, children := cosis[0], cosis[1:]
var publics []abstract.Point
// add root public key
rootPublic := testSuite.Point().Mul(nil, root.private)
publics = append(publics, rootPublic)
for _, ch := range children {
// add children public key
public := testSuite.Point().Mul(nil, ch.private)
publics = append(publics, public)
}
sig := root.Signature()
if err := VerifySignature(testSuite, publics, msg, sig); err != nil {
t.Fatal("Error veriying:", err)
}
var Ed25519Publics []xEd25519.PublicKey
for _, p := range publics {
buff, err := p.MarshalBinary()
assert.Nil(t, err)
Ed25519Publics = append(Ed25519Publics, xEd25519.PublicKey(buff))
}
if !cosi.Verify(Ed25519Publics, nil, msg, sig) {
t.Error("github.com/bforg/golang-x-crypto/ed25519/cosi fork can't verify")
}
}
func TestCosiSignatureWithMask(t *testing.T) {
msg := []byte("Hello World Cosi")
nb := 5
fail := 2
cosis, publics := genCosisFailing(nb, fail)
genFinalCosi(cosis, msg)
root := cosis[0]
sig := root.Signature()
if err := VerifySignature(testSuite, publics, msg, sig); err != nil {
t.Fatal("Error veriying:", err)
}
var Ed25519Publics []xEd25519.PublicKey
for _, p := range publics {
buff, err := p.MarshalBinary()
assert.Nil(t, err)
Ed25519Publics = append(Ed25519Publics, xEd25519.PublicKey(buff))
}
if !cosi.Verify(Ed25519Publics, cosi.ThresholdPolicy(3), msg, sig) {
t.Error("github.com/bforg/golang-x-crypto/ed25519/cosi fork can't verify")
}
if cosi.Verify(Ed25519Publics, cosi.ThresholdPolicy(4), msg, sig) {
t.Error("github.com/bforg/golang-x-crypto/ed25519/cosi fork can't verify")
}
}