monero/tests/unit_tests/ringct.cpp

// Copyright (c) 2014-2016, The Monero Project
// 
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// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers

#include "gtest/gtest.h"

#include <cstdint>
#include <algorithm>

#include "ringct/rctTypes.h"
#include "ringct/rctSigs.h"
#include "ringct/rctOps.h"

using namespace crypto;
using namespace rct;

TEST(ringct, SNL)
{
  key x, P1;
  skpkGen(x, P1);

  key P2 = pkGen();
  key P3 = pkGen();

  key L1, s1, s2;
  GenSchnorrNonLinkable(L1, s1, s2, x, P1, P2, 0);

  // a valid one
  // an invalid one
  ASSERT_TRUE(VerSchnorrNonLinkable(P1, P2, L1, s1, s2));
  ASSERT_FALSE(VerSchnorrNonLinkable(P1, P3, L1, s1, s2));
}

TEST(ringct, ASNL)
{
    int j = 0;

        //Tests for ASNL
        //#ASNL true one, false one, C != sum Ci, and one out of the range..
        int N = 64;
        key64 xv;
        key64 P1v;
        key64 P2v;
        bits indi;

        for (j = 0 ; j < N ; j++) {
            indi[j] = (int)randXmrAmount(2);

            xv[j] = skGen();
            if ( (int)indi[j] == 0 ) {
                P1v[j] = scalarmultBase(xv[j]);
                P2v[j] = pkGen();

            } else {

                P2v[j] = scalarmultBase(xv[j]);
                P1v[j] = pkGen();

            }
        }

        //#true one
        asnlSig L1s2s = GenASNL(xv, P1v, P2v, indi);
        ASSERT_TRUE(VerASNL(P1v, P2v, L1s2s));

        //#false one
        indi[3] = (indi[3] + 1) % 2;
        L1s2s = GenASNL(xv, P1v, P2v, indi);
        ASSERT_FALSE(VerASNL(P1v, P2v, L1s2s));

        //#true one again
        indi[3] = (indi[3] + 1) % 2;
        L1s2s = GenASNL(xv, P1v, P2v, indi);
        ASSERT_TRUE(VerASNL(P1v, P2v, L1s2s));

        //#false one
        L1s2s = GenASNL(xv, P2v, P1v, indi);
        ASSERT_FALSE(VerASNL(P1v, P2v, L1s2s));
}

TEST(ringct, MG_sigs)
{
    int j = 0;
    int N = 0;

        //Tests for MG Sigs
        //#MG sig: true one
        N = 3;// #cols
        int   R = 3;// #rows
        keyV xtmp = skvGen(R);
        keyM xm = keyMInit(R, N);// = [[None]*N] #just used to generate test public keys
        keyV sk = skvGen(R);
        keyM P  = keyMInit(R, N);// = keyM[[None]*N] #stores the public keys;
        int ind = 2;
        int i = 0;
        for (j = 0 ; j < R ; j++) {
            for (i = 0 ; i < N ; i++)
            {
                xm[i][j] = skGen();
                P[i][j] = scalarmultBase(xm[i][j]);
            }
        }
        for (j = 0 ; j < R ; j++) {
            sk[j] = xm[ind][j];
        }
        key message = identity();
        mgSig IIccss = MLSAG_Gen(message, P, sk, ind);
        ASSERT_TRUE(MLSAG_Ver(message, P, IIccss));

        //#MG sig: false one
        N = 3;// #cols
        R = 3;// #rows
        xtmp = skvGen(R);
        keyM xx(N, xtmp);// = [[None]*N] #just used to generate test public keys
        sk = skvGen(R);
        //P (N, xtmp);// = keyM[[None]*N] #stores the public keys;

        ind = 2;
        for (j = 0 ; j < R ; j++) {
            for (i = 0 ; i < N ; i++)
            {
                xx[i][j] = skGen();
                P[i][j] = scalarmultBase(xx[i][j]);
            }
            sk[j] = xx[ind][j];
        }
        sk[2] = skGen();//asume we don't know one of the private keys..
        IIccss = MLSAG_Gen(message, P, sk, ind);
        ASSERT_FALSE(MLSAG_Ver(message, P, IIccss));
}

TEST(ringct, range_proofs)
{
        //Ring CT Stuff
        //ct range proofs
        ctkeyV sc, pc;
        ctkey sctmp, pctmp;
        //add fake input 5000
        tie(sctmp, pctmp) = ctskpkGen(6000);
        sc.push_back(sctmp);
        pc.push_back(pctmp);


        tie(sctmp, pctmp) = ctskpkGen(7000);
        sc.push_back(sctmp);
        pc.push_back(pctmp);
        vector<xmr_amount >amounts;


        //add output 500
        amounts.push_back(500);
        keyV destinations;
        key Sk, Pk;
        skpkGen(Sk, Pk);
        destinations.push_back(Pk);


        //add output for 12500
        amounts.push_back(12500);
        skpkGen(Sk, Pk);
        destinations.push_back(Pk);

        //compute rct data with mixin 500
        rctSig s = genRct(sc, pc, destinations, amounts, 3);

        //verify rct data
        ASSERT_TRUE(verRct(s));

        //decode received amount
        ASSERT_TRUE(decodeRct(s, Sk, 1));

        // Ring CT with failing MG sig part should not verify!
        // Since sum of inputs != outputs

        amounts[1] = 12501;
        skpkGen(Sk, Pk);
        destinations[1] = Pk;


        //compute rct data with mixin 500
        s = genRct(sc, pc, destinations, amounts, 3);

        //verify rct data
        ASSERT_FALSE(verRct(s));

        //decode received amount
        ASSERT_TRUE(decodeRct(s, Sk, 1));
}

TEST(ringct, range_proofs_with_fee)
{
        //Ring CT Stuff
        //ct range proofs
        ctkeyV sc, pc;
        ctkey sctmp, pctmp;
        //add fake input 5000
        tie(sctmp, pctmp) = ctskpkGen(6001);
        sc.push_back(sctmp);
        pc.push_back(pctmp);


        tie(sctmp, pctmp) = ctskpkGen(7000);
        sc.push_back(sctmp);
        pc.push_back(pctmp);
        vector<xmr_amount >amounts;


        //add output 500
        amounts.push_back(500);
        keyV destinations;
        key Sk, Pk;
        skpkGen(Sk, Pk);
        destinations.push_back(Pk);

        //add txn fee for 1
        //has no corresponding destination..
        amounts.push_back(1);

        //add output for 12500
        amounts.push_back(12500);
        skpkGen(Sk, Pk);
        destinations.push_back(Pk);

        //compute rct data with mixin 500
        rctSig s = genRct(sc, pc, destinations, amounts, 3);

        //verify rct data
        ASSERT_TRUE(verRct(s));

        //decode received amount
        ASSERT_TRUE(decodeRct(s, Sk, 1));

        // Ring CT with failing MG sig part should not verify!
        // Since sum of inputs != outputs

        amounts[1] = 12501;
        skpkGen(Sk, Pk);
        destinations[1] = Pk;


        //compute rct data with mixin 500
        s = genRct(sc, pc, destinations, amounts, 3);

        //verify rct data
        ASSERT_FALSE(verRct(s));

        //decode received amount
        ASSERT_TRUE(decodeRct(s, Sk, 1));
}

static rct::rctSig make_sample_rct_sig(int n_inputs, const uint64_t input_amounts[], int n_outputs, const uint64_t output_amounts[], bool last_is_fee)
{
    ctkeyV sc, pc;
    ctkey sctmp, pctmp;
    vector<xmr_amount >amounts;
    keyV destinations;
    key Sk, Pk;

    for (int n = 0; n < n_inputs; ++n) {
        tie(sctmp, pctmp) = ctskpkGen(input_amounts[n]);
        sc.push_back(sctmp);
        pc.push_back(pctmp);
    }

    for (int n = 0; n < n_outputs; ++n) {
        amounts.push_back(output_amounts[n]);
        skpkGen(Sk, Pk);
        if (n < n_outputs - 1 || !last_is_fee)
          destinations.push_back(Pk);
    }

    return genRct(sc, pc, destinations, amounts, 3);;
}

static bool range_proof_test(bool expected_valid,
    int n_inputs, const uint64_t input_amounts[], int n_outputs, const uint64_t output_amounts[], bool last_is_fee)
{
    //compute rct data
    bool valid;
    try {
        rctSig s = make_sample_rct_sig(n_inputs, input_amounts, n_outputs, output_amounts, last_is_fee);
        valid = verRct(s);
    }
    catch (const std::exception &e) {
        valid = false;
    }

    if (valid == expected_valid) {
        return testing::AssertionSuccess();
    }
    else {
        return testing::AssertionFailure();
    }
}

#define NELTS(array) (sizeof(array)/sizeof(array[0]))

TEST(ringct, range_proofs_reject_empty_outs)
{
  const uint64_t inputs[] = {5000};
  const uint64_t outputs[] = {};
  EXPECT_TRUE(range_proof_test(false, NELTS(inputs), inputs, NELTS(outputs), outputs, false));
}

TEST(ringct, range_proofs_reject_empty_ins)
{
  const uint64_t inputs[] = {};
  const uint64_t outputs[] = {5000};
  EXPECT_TRUE(range_proof_test(false, NELTS(inputs), inputs, NELTS(outputs), outputs, false));
}

TEST(ringct, range_proofs_reject_all_empty)
{
  const uint64_t inputs[] = {};
  const uint64_t outputs[] = {};
  EXPECT_TRUE(range_proof_test(false, NELTS(inputs), inputs, NELTS(outputs), outputs, false));
}

TEST(ringct, range_proofs_accept_zero_empty)
{
  const uint64_t inputs[] = {0};
  const uint64_t outputs[] = {};
  EXPECT_TRUE(range_proof_test(true, NELTS(inputs), inputs, NELTS(outputs), outputs, false));
}

TEST(ringct, range_proofs_reject_empty_zero)
{
  const uint64_t inputs[] = {};
  const uint64_t outputs[] = {0};
  EXPECT_TRUE(range_proof_test(false, NELTS(inputs), inputs, NELTS(outputs), outputs, false));
}

TEST(ringct, range_proofs_accept_zero_zero)
{
  const uint64_t inputs[] = {0};
  const uint64_t outputs[] = {0};
  EXPECT_TRUE(range_proof_test(true, NELTS(inputs), inputs, NELTS(outputs), outputs, false));
}

TEST(ringct, range_proofs_accept_zero_out_first)
{
  const uint64_t inputs[] = {5000};
  const uint64_t outputs[] = {0, 5000};
  EXPECT_TRUE(range_proof_test(true, NELTS(inputs), inputs, NELTS(outputs), outputs, false));
}

TEST(ringct, range_proofs_accept_zero_out_last)
{
  const uint64_t inputs[] = {5000};
  const uint64_t outputs[] = {5000, 0};
  EXPECT_TRUE(range_proof_test(true, NELTS(inputs), inputs, NELTS(outputs), outputs, false));
}

TEST(ringct, range_proofs_accept_zero_out_middle)
{
  const uint64_t inputs[] = {5000};
  const uint64_t outputs[] = {2500, 0, 2500};
  EXPECT_TRUE(range_proof_test(true, NELTS(inputs), inputs, NELTS(outputs), outputs, false));
}

TEST(ringct, range_proofs_accept_zero_in_first)
{
  const uint64_t inputs[] = {0, 5000};
  const uint64_t outputs[] = {5000};
  EXPECT_TRUE(range_proof_test(true, NELTS(inputs), inputs, NELTS(outputs), outputs, false));
}

TEST(ringct, range_proofs_accept_zero_in_last)
{
  const uint64_t inputs[] = {5000, 0};
  const uint64_t outputs[] = {5000};
  EXPECT_TRUE(range_proof_test(true, NELTS(inputs), inputs, NELTS(outputs), outputs, false));
}

TEST(ringct, range_proofs_accept_zero_in_middle)
{
  const uint64_t inputs[] = {2500, 0, 2500};
  const uint64_t outputs[] = {5000};
  EXPECT_TRUE(range_proof_test(true, NELTS(inputs), inputs, NELTS(outputs), outputs, false));
}

TEST(ringct, range_proofs_reject_single_lower)
{
  const uint64_t inputs[] = {5000};
  const uint64_t outputs[] = {1};
  EXPECT_TRUE(range_proof_test(false, NELTS(inputs), inputs, NELTS(outputs), outputs, false));
}

TEST(ringct, range_proofs_reject_single_higher)
{
  const uint64_t inputs[] = {5000};
  const uint64_t outputs[] = {5001};
  EXPECT_TRUE(range_proof_test(false, NELTS(inputs), inputs, NELTS(outputs), outputs, false));
}

TEST(ringct, range_proofs_reject_single_out_negative)
{
  const uint64_t inputs[] = {5000};
  const uint64_t outputs[] = {(uint64_t)-1000ll};
  EXPECT_TRUE(range_proof_test(false, NELTS(inputs), inputs, NELTS(outputs), outputs, false));
}

TEST(ringct, range_proofs_reject_out_negative_first)
{
  const uint64_t inputs[] = {5000};
  const uint64_t outputs[] = {(uint64_t)-1000ll, 6000};
  EXPECT_TRUE(range_proof_test(false, NELTS(inputs), inputs, NELTS(outputs), outputs, false));
}

TEST(ringct, range_proofs_reject_out_negative_last)
{
  const uint64_t inputs[] = {5000};
  const uint64_t outputs[] = {6000, (uint64_t)-1000ll};
  EXPECT_TRUE(range_proof_test(false, NELTS(inputs), inputs, NELTS(outputs), outputs, false));
}

TEST(ringct, range_proofs_reject_out_negative_middle)
{
  const uint64_t inputs[] = {5000};
  const uint64_t outputs[] = {3000, (uint64_t)-1000ll, 3000};
  EXPECT_TRUE(range_proof_test(false, NELTS(inputs), inputs, NELTS(outputs), outputs, false));
}

TEST(ringct, range_proofs_reject_single_in_negative)
{
  const uint64_t inputs[] = {(uint64_t)-1000ll};
  const uint64_t outputs[] = {5000};
  EXPECT_TRUE(range_proof_test(false, NELTS(inputs), inputs, NELTS(outputs), outputs, false));
}

TEST(ringct, range_proofs_reject_in_negative_first)
{
  const uint64_t inputs[] = {(uint64_t)-1000ll, 6000};
  const uint64_t outputs[] = {5000};
  EXPECT_TRUE(range_proof_test(false, NELTS(inputs), inputs, NELTS(outputs), outputs, false));
}

TEST(ringct, range_proofs_reject_in_negative_last)
{
  const uint64_t inputs[] = {6000, (uint64_t)-1000ll};
  const uint64_t outputs[] = {5000};
  EXPECT_TRUE(range_proof_test(false, NELTS(inputs), inputs, NELTS(outputs), outputs, false));
}

TEST(ringct, range_proofs_reject_in_negative_middle)
{
  const uint64_t inputs[] = {3000, (uint64_t)-1000ll, 3000};
  const uint64_t outputs[] = {5000};
  EXPECT_TRUE(range_proof_test(false, NELTS(inputs), inputs, NELTS(outputs), outputs, false));
}

TEST(ringct, range_proofs_reject_higher_list)
{
  const uint64_t inputs[] = {5000};
  const uint64_t outputs[] = {1000, 1000, 1000, 1000, 1000, 1000};
  EXPECT_TRUE(range_proof_test(false, NELTS(inputs), inputs, NELTS(outputs), outputs, false));
}

TEST(ringct, range_proofs_accept_1_to_1)
{
  const uint64_t inputs[] = {5000};
  const uint64_t outputs[] = {5000};
  EXPECT_TRUE(range_proof_test(true, NELTS(inputs), inputs, NELTS(outputs), outputs, false));
}

TEST(ringct, range_proofs_accept_1_to_N)
{
  const uint64_t inputs[] = {5000};
  const uint64_t outputs[] = {1000, 1000, 1000, 1000, 1000};
  EXPECT_TRUE(range_proof_test(true, NELTS(inputs), inputs, NELTS(outputs), outputs, false));
}

TEST(ringct, range_proofs_accept_N_to_1)
{
  const uint64_t inputs[] = {1000, 1000, 1000, 1000, 1000};
  const uint64_t outputs[] = {5000};
  EXPECT_TRUE(range_proof_test(true, NELTS(inputs), inputs, NELTS(outputs), outputs, false));
}

TEST(ringct, range_proofs_accept_N_to_N)
{
  const uint64_t inputs[] = {1000, 1000, 1000, 1000, 1000};
  const uint64_t outputs[] = {1000, 1000, 1000, 1000, 1000};
  EXPECT_TRUE(range_proof_test(true, NELTS(inputs), inputs, NELTS(outputs), outputs, false));
}

TEST(ringct, range_proofs_accept_very_long)
{
  const size_t N=64;
  uint64_t inputs[N];
  uint64_t outputs[N];
  for (size_t n = 0; n < N; ++n) {
    inputs[n] = n;
    outputs[n] = n;
  }
  std::random_shuffle(inputs, inputs + N);
  std::random_shuffle(outputs, outputs + N);
  EXPECT_TRUE(range_proof_test(true, NELTS(inputs), inputs, NELTS(outputs), outputs, false));
}

TEST(ringct, HPow2)
{
  key G = scalarmultBase(d2h(1));

  key H = hashToPointSimple(G);
  for (int j = 0 ; j < ATOMS ; j++) {
    ASSERT_TRUE(equalKeys(H, H2[j]));
    addKeys(H, H, H);
  }
}

static const xmr_amount test_amounts[]={0, 1, 2, 3, 4, 5, 10000, 10000000000000000000ull, 10203040506070809000ull, 123456789123456789};

TEST(ringct, ecdh_roundtrip)
{
  key k, P1;
  ecdhTuple t0, t1;

  for (auto amount: test_amounts) {
    skpkGen(k, P1);

    t0.mask = skGen();
    t0.amount = d2h(amount);

    t1 = t0;
    ecdhEncode(t1, P1);
    ecdhDecode(t1, k);
    ASSERT_TRUE(t0.mask == t1.mask);
    ASSERT_TRUE(equalKeys(t0.mask, t1.mask));
    ASSERT_TRUE(t0.amount == t1.amount);
    ASSERT_TRUE(equalKeys(t0.amount, t1.amount));
  }
}

TEST(ringct, d2h)
{
  key k, P1;
  skpkGen(k, P1);
  for (auto amount: test_amounts) {
    d2h(k, amount);
    ASSERT_TRUE(amount == h2d(k));
  }
}

TEST(ringct, d2b)
{
  for (auto amount: test_amounts) {
    bits b;
    d2b(b, amount);
    ASSERT_TRUE(amount == b2d(b));
  }
}

TEST(ringct, prooveRange_is_non_deterministic)
{
  key C[2], mask[2];
  for (int n = 0; n < 2; ++n)
    proveRange(C[n], mask[n], 80);
  ASSERT_TRUE(memcmp(C[0].bytes, C[1].bytes, sizeof(C[0].bytes)));
  ASSERT_TRUE(memcmp(mask[0].bytes, mask[1].bytes, sizeof(mask[0].bytes)));
}

TEST(ringct, fee_0_valid)
{
  const uint64_t inputs[] = {1000, 1000};
  const uint64_t outputs[] = {2000, 0};
  EXPECT_TRUE(range_proof_test(true, NELTS(inputs), inputs, NELTS(outputs), outputs, true));
}

TEST(ringct, fee_non_0_valid)
{
  const uint64_t inputs[] = {1000, 1000};
  const uint64_t outputs[] = {1900, 100};
  EXPECT_TRUE(range_proof_test(true, NELTS(inputs), inputs, NELTS(outputs), outputs, true));
}

TEST(ringct, fee_non_0_invalid_higher)
{
  const uint64_t inputs[] = {1000, 1000};
  const uint64_t outputs[] = {1990, 100};
  EXPECT_TRUE(range_proof_test(false, NELTS(inputs), inputs, NELTS(outputs), outputs, true));
}

TEST(ringct, fee_non_0_invalid_lower)
{
  const uint64_t inputs[] = {1000, 1000};
  const uint64_t outputs[] = {1000, 100};
  EXPECT_TRUE(range_proof_test(false, NELTS(inputs), inputs, NELTS(outputs), outputs, true));
}

TEST(ringct, fee_burn_valid_one_out)
{
  const uint64_t inputs[] = {1000, 1000};
  const uint64_t outputs[] = {0, 2000};
  EXPECT_TRUE(range_proof_test(true, NELTS(inputs), inputs, NELTS(outputs), outputs, true));
}

TEST(ringct, fee_burn_valid_zero_out)
{
  const uint64_t inputs[] = {1000, 1000};
  const uint64_t outputs[] = {2000};
  EXPECT_TRUE(range_proof_test(true, NELTS(inputs), inputs, NELTS(outputs), outputs, true));
}

#define TEST_rctSig_elements(name, op) \
TEST(ringct, rctSig_##name) \
{ \
  const uint64_t inputs[] = {1000, 1000}; \
  const uint64_t outputs[] = {1000, 1000}; \
  rct::rctSig sig = make_sample_rct_sig(NELTS(inputs), inputs, NELTS(outputs), outputs, true); \
  ASSERT_TRUE(rct::verRct(sig)); \
  op; \
  ASSERT_FALSE(rct::verRct(sig)); \
}

TEST_rctSig_elements(rangeSigs_empty, sig.rangeSigs.resize(0));
TEST_rctSig_elements(rangeSigs_too_many, sig.rangeSigs.push_back(sig.rangeSigs.back()));
TEST_rctSig_elements(rangeSigs_too_few, sig.rangeSigs.pop_back());
TEST_rctSig_elements(mgSig_ss_empty, sig.MG.ss.resize(0));
TEST_rctSig_elements(mgSig_ss_too_many, sig.MG.ss.push_back(sig.MG.ss.back()));
TEST_rctSig_elements(mgSig_ss_too_few, sig.MG.ss.pop_back());
TEST_rctSig_elements(mgSig_ss0_empty, sig.MG.ss[0].resize(0));
TEST_rctSig_elements(mgSig_ss0_too_many, sig.MG.ss[0].push_back(sig.MG.ss[0].back()));
TEST_rctSig_elements(mgSig_ss0_too_few, sig.MG.ss[0].pop_back());
TEST_rctSig_elements(mgSig_II_empty, sig.MG.II.resize(0));
TEST_rctSig_elements(mgSig_II_too_many, sig.MG.II.push_back(sig.MG.II.back()));
TEST_rctSig_elements(mgSig_II_too_few, sig.MG.II.pop_back());
TEST_rctSig_elements(mgSig_mixRing_empty, sig.mixRing.resize(0));
TEST_rctSig_elements(mgSig_mixRing_too_many, sig.mixRing.push_back(sig.mixRing.back()));
TEST_rctSig_elements(mgSig_mixRing_too_few, sig.mixRing.pop_back());
TEST_rctSig_elements(mgSig_mixRing0_empty, sig.mixRing[0].resize(0));
TEST_rctSig_elements(mgSig_mixRing0_too_many, sig.mixRing[0].push_back(sig.mixRing[0].back()));
TEST_rctSig_elements(mgSig_mixRing0_too_few, sig.mixRing[0].pop_back());
TEST_rctSig_elements(ecdhInfo_empty, sig.ecdhInfo.resize(0));
TEST_rctSig_elements(ecdhInfo_too_many, sig.ecdhInfo.push_back(sig.ecdhInfo.back()));
TEST_rctSig_elements(ecdhInfo_too_few, sig.ecdhInfo.pop_back());
TEST_rctSig_elements(outPk_empty, sig.outPk.resize(0));
TEST_rctSig_elements(outPk_too_many, sig.outPk.push_back(sig.outPk.back()));
TEST_rctSig_elements(outPk_too_few, sig.outPk.pop_back());