// Try to verify a proof that has a single flipped bit
func TestInvalidatedUserProof(T *testing.T) {
data, users, _ := createSetup(5, 2)
msg, err := users[0].GetCoverCipherText(data, 3, 1)
if err != nil {
T.Fatalf("Failed to create proof: %v", err)
}
crypto.FlipBit(msg.Proof)
if err := msg.Verify(data); err == nil {
T.Log("Forged proof was valid, should be invalid")
T.Fail()
}
points := make([]abstract.Point, 3)
for i := range points {
points[i], _ = crypto.Suite.Point().Pick(nil, crypto.Suite.Cipher(nil))
}
msg, err = users[0].GetRealCipherText(data, points)
if err != nil {
T.Fatalf("Failed to create proof: %v", err)
}
crypto.FlipBit(msg.Proof)
if err := msg.Verify(data); err == nil {
T.Log("Forged proof was valid, should be invalid")
T.Fail()
}
}
// Test what happens if we mess with the secret r_j = \sum_i r_{ij}
func TestInvalidatedNotaryProof(T *testing.T) {
data, _, notaries := createSetup(5, 2)
msg, err := notaries[0].GetCiphertext(data, 3)
if err != nil {
T.Fatalf("Failed to create proof: %v", err)
}
crypto.FlipBit(msg.Proof)
if err := msg.Verify(data); err == nil {
T.Fatal("Forged proof was valid, should be invalid")
}
}