r1

test/functional/zerocoin_wrapped_serials.py

@@ -0,0 +1,108 @@
+#!/usr/bin/env python3
+# Copyright (c) 2019 The PIVX developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+'''
+Covers the 'Wrapped Serials Attack' scenario
+'''
+
+import random
+from time import sleep
+
+from test_framework.authproxy import JSONRPCException
+from test_framework.util import assert_equal, assert_greater_than
+
+from fake_stake.base_test import Agrarian_FakeStakeTest
+
+class zAGRwrappedSerialsTest(Agrarian_FakeStakeTest):
+
+    def run_test(self):
+        q = 73829871667027927151400291810255409637272593023945445234219354687881008052707
+        pow2 = 2**256
+        self.description = "Covers the 'Wrapped Serials Attack' scenario."
+        self.init_test()
+
+        INITAL_MINED_BLOCKS = 351   # Blocks mined before minting
+        MORE_MINED_BLOCKS = 31      # Blocks mined after minting (before spending)
+        DENOM_TO_USE = 1000         # zc denomination used for double spending attack
+        K_BITSIZE = 128             # bitsize of the range for random K
+        NUM_OF_K = 5                # number of wrapping serials to try
+
+        # 1) Start mining blocks
+        self.log.info("Mining %d first blocks..." % INITAL_MINED_BLOCKS)
+        self.node.generate(INITAL_MINED_BLOCKS)
+        sleep(2)
+
+        # 2) Mint zerocoins
+        self.log.info("Minting %d-denom zAGRs..." % DENOM_TO_USE)
+        balance = self.node.getbalance("*", 100)
+        assert_greater_than(balance, DENOM_TO_USE)
+        total_mints = 0
+        while balance > DENOM_TO_USE:
+            try:
+                self.node.mintzerocoin(DENOM_TO_USE)
+            except JSONRPCException:
+                break
+            sleep(1)
+            total_mints += 1
+            self.node.generate(1)
+            sleep(1)
+            if total_mints % 5 == 0:
+                self.log.info("Minted %d coins" % total_mints)
+            if total_mints >= 20:
+                break
+            balance = self.node.getbalance("*", 100)
+        sleep(2)
+
+        # 3) Mine more blocks and collect the mint
+        self.log.info("Mining %d more blocks..." % MORE_MINED_BLOCKS)
+        self.node.generate(MORE_MINED_BLOCKS)
+        sleep(2)
+        mint = self.node.listmintedzerocoins(True, True)[0]
+
+        # 4) Get the raw zerocoin data
+        exported_zerocoins = self.node.exportzerocoins(False)
+        zc = [x for x in exported_zerocoins if mint["serial hash"] == x["id"]]
+        if len(zc) == 0:
+            raise AssertionError("mint not found")
+
+        # 5) Spend the minted coin (mine two more blocks)
+        self.log.info("Spending the minted coin with serial %s and mining two more blocks..." % zc[0]["s"])
+        txid = self.node.spendzerocoinmints([mint["serial hash"]])['txid']
+        self.log.info("Spent on tx %s" % txid)
+        self.node.generate(2)
+        sleep(2)
+
+        # 6) create the new serials
+        new_serials = []
+        for i in range(NUM_OF_K):
+            K = random.getrandbits(K_BITSIZE)
+            new_serials.append(hex(int(zc[0]["s"], 16) + K*q*pow2)[2:])
+
+        randomness = zc[0]["r"]
+        privkey = zc[0]["k"]
+
+        # 7) Spend the new zerocoins
+        for serial in new_serials:
+            self.log.info("Spending the wrapping serial %s" % serial)
+            tx = None
+            try:
+                tx = self.node.spendrawzerocoin(serial, randomness, DENOM_TO_USE, privkey)
+            except JSONRPCException as e:
+                exc_msg = str(e)
+                if exc_msg == "CoinSpend: failed check (-4)":
+                    self.log.info("GOOD: Transaction did not verify")
+                else:
+                    raise e
+
+            if tx is not None:
+                self.log.warning("Tx is: %s" % tx)
+                raise AssertionError("TEST FAILED")
+
+        self.log.info("%s PASSED" % self.__class__.__name__)
+
+
+
+if __name__ == '__main__':
+    zAGRwrappedSerialsTest().main()