monero/tests/unit_tests/ringct.cpp

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// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers

#include "gtest/gtest.h"

#include <cstdint>

#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));
}

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));
  }
}