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// Copyright (c) 2014-2020, The Monero Project
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers
#pragma once
#include "ringct/rctSigs.h"
#include "ringct/rctTypes.h"
#include "device/device.hpp"
using namespace rct;
template<size_t a_N, size_t a_T, size_t a_w>
class test_sig_clsag
{
public:
static const size_t loop_count = 1000;
static const size_t N = a_N;
static const size_t T = a_T;
static const size_t w = a_w;
bool init()
{
pubs.reserve(N);
pubs.resize(N);
r = keyV(w); // M[l[u]] = Com(0,r[u])
a = keyV(w); // P[l[u]] = Com(a[u],s[u])
s = keyV(w);
Q = keyV(T); // Q[j] = Com(b[j],t[j])
b = keyV(T);
t = keyV(T);
// Random keys
key temp;
for (size_t k = 0; k < N; k++)
{
skpkGen(temp,pubs[k].dest);
skpkGen(temp,pubs[k].mask);
}
// Signing and commitment keys (assumes fixed signing indices 0,1,...,w-1 for this test)
// TODO: random signing indices
C_offsets = keyV(w); // P[l[u]] - C_offsets[u] = Com(0,s[u]-s1[u])
s1 = keyV(w);
key a_sum = zero();
key s1_sum = zero();
messages = keyV(w);
for (size_t u = 0; u < w; u++)
{
skpkGen(r[u],pubs[u].dest); // M[u] = Com(0,r[u])
a[u] = skGen(); // P[u] = Com(a[u],s[u])
s[u] = skGen();
addKeys2(pubs[u].mask,s[u],a[u],H);
s1[u] = skGen(); // C_offsets[u] = Com(a[u],s1[u])
addKeys2(C_offsets[u],s1[u],a[u],H);
sc_add(a_sum.bytes,a_sum.bytes,a[u].bytes);
sc_add(s1_sum.bytes,s1_sum.bytes,s1[u].bytes);
messages[u] = skGen();
}
// Outputs
key b_sum = zero();
key t_sum = zero();
for (size_t j = 0; j < T-1; j++)
{
b[j] = skGen(); // Q[j] = Com(b[j],t[j])
t[j] = skGen();
addKeys2(Q[j],t[j],b[j],H);
sc_add(b_sum.bytes,b_sum.bytes,b[j].bytes);
sc_add(t_sum.bytes,t_sum.bytes,t[j].bytes);
}
// Value/mask balance for Q[T-1]
sc_sub(b[T-1].bytes,a_sum.bytes,b_sum.bytes);
sc_sub(t[T-1].bytes,s1_sum.bytes,t_sum.bytes);
addKeys2(Q[T-1],t[T-1],b[T-1],H);
// Build proofs
sigs.reserve(w);
sigs.resize(0);
ctkey sk;
for (size_t u = 0; u < w; u++)
{
sk.dest = r[u];
sk.mask = s[u];
sigs.push_back(proveRctCLSAGSimple(messages[u],pubs,sk,s1[u],C_offsets[u],NULL,NULL,NULL,u,hw::get_device("default")));
}
return true;
}
bool test()
{
for (size_t u = 0; u < w; u++)
{
if (!verRctCLSAGSimple(messages[u],sigs[u],pubs,C_offsets[u]))
{
return false;
}
}
// Check balanace
std::vector<MultiexpData> balance;
balance.reserve(w + T);
balance.resize(0);
key ZERO = zero();
key ONE = identity();
key MINUS_ONE;
sc_sub(MINUS_ONE.bytes,ZERO.bytes,ONE.bytes);
for (size_t u = 0; u < w; u++)
{
balance.push_back({ONE,C_offsets[u]});
}
for (size_t j = 0; j < T; j++)
{
balance.push_back({MINUS_ONE,Q[j]});
}
if (!(straus(balance) == ONE)) // group identity
{
return false;
}
return true;
}
private:
ctkeyV pubs;
keyV Q;
keyV r;
keyV s;
keyV s1;
keyV t;
keyV a;
keyV b;
keyV C_offsets;
keyV messages;
std::vector<clsag> sigs;
};
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