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AutoTest_R1CS.hpp
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AutoTest_R1CS.hpp
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#ifndef _SNARKLIB_AUTOTEST_R1CS_HPP_
#define _SNARKLIB_AUTOTEST_R1CS_HPP_
#include <cstdint>
#include <ostream>
#include <sstream>
#include <string>
#ifdef USE_OLD_LIBSNARK
#include /*libsnark*/ "r1cs/r1cs.hpp"
#else
#include /*libsnark*/ "relations/constraint_satisfaction_problems/r1cs/r1cs.hpp"
#endif
#include "snarklib/ForeignLib.hpp"
#include "snarklib/HugeSystem.hpp"
#include "snarklib/Rank1DSL.hpp"
namespace snarklib {
////////////////////////////////////////////////////////////////////////////////
// base class for rank-1 constraint system with number of inputs
//
template <template <typename> class SYS, typename T, typename U>
class AutoTestR1CS
{
public:
std::string r1csName() const {
std::stringstream ss;
ss << typeid(*this).name();
return ss.str();
}
const libsnark::r1cs_constraint_system<U>& systemA() const { return m_csA; }
#ifdef USE_OLD_LIBSNARK
const libsnark::r1cs_variable_assignment<U>& witnessA() const { return m_witnessA; }
const libsnark::r1cs_variable_assignment<U>& inputA() const { return m_inputA; }
#else
const libsnark::r1cs_auxiliary_input<U>& witnessA() const { return m_witnessA; }
const libsnark::r1cs_primary_input<U>& inputA() const { return m_inputA; }
#endif
const SYS<T>& systemB() const { return m_csB; }
const R1Witness<T>& witnessB() const { return m_witnessB; }
const R1Witness<T>& inputB() const { return m_inputB; }
const std::size_t numCircuitInputs() const {
return m_inputB.size();
}
protected:
AutoTestR1CS(const std::string& filePrefix)
: m_filePrefix(filePrefix)
{}
void init_A_from_B() {
copy_libsnark(
this->m_csB,
this->m_witnessB,
this->m_inputB,
this->m_csA,
this->m_witnessA,
this->m_inputA);
}
void addBooleanity_B(const R1Variable<T>& x) {
m_csB.addConstraint(x * (T::one() - x) == T::zero());
}
void clearAppend(R1System<T>& a) {}
void finalize(R1System<T>& a) {}
void clearAppend(HugeSystem<T>& a) { a.clearAppend(m_filePrefix, 1); }
void finalize(HugeSystem<T>& a) { a.finalize(numCircuitInputs()); }
libsnark::r1cs_constraint_system<U> m_csA;
#ifdef USE_OLD_LIBSNARK
libsnark::r1cs_variable_assignment<U> m_witnessA, m_inputA;
#else
libsnark::r1cs_auxiliary_input<U> m_witnessA;
libsnark::r1cs_primary_input<U> m_inputA;
#endif
SYS<T> m_csB;
R1Witness<T> m_witnessB, m_inputB;
private:
const std::string m_filePrefix;
};
template <template <typename> class SYS, typename T, typename U>
std::ostream& operator<< (std::ostream& out, const AutoTestR1CS<SYS, T, U>& a) {
return out << a.r1csName();
}
////////////////////////////////////////////////////////////////////////////////
// single AND gate
//
template <template <typename> class SYS, typename T, typename U>
class AutoTestR1CS_AND : public AutoTestR1CS<SYS, T, U>
{
public:
AutoTestR1CS_AND(const bool x_IC, const bool y_IC, const std::string& filePrefix)
: AutoTestR1CS<SYS, T, U>(filePrefix),
m_booleanityX(x_IC),
m_booleanityY(y_IC)
{
initB();
this->init_A_from_B();
}
private:
void initB() {
this->clearAppend(this->m_csB);
R1Variable<T> x(1), y(2), z(3);
this->m_csB.addConstraint(x * y == z);
if (m_booleanityX) this->addBooleanity_B(x);
if (m_booleanityY) this->addBooleanity_B(y);
this->m_csB.swap_AB_if_beneficial();
this->m_witnessB.assignVar(x, T::one());
this->m_witnessB.assignVar(y, T::one());
this->m_witnessB.assignVar(z, T::one());
this->m_inputB.assignVar(x, T::one());
this->m_inputB.assignVar(y, T::one());
this->finalize(this->m_csB);
}
const bool m_booleanityX;
const bool m_booleanityY;
};
////////////////////////////////////////////////////////////////////////////////
// single OR gate
//
template <template <typename> class SYS, typename T, typename U>
class AutoTestR1CS_OR : public AutoTestR1CS<SYS, T, U>
{
public:
AutoTestR1CS_OR(const bool x_IC, const bool y_IC, const std::string& filePrefix)
: AutoTestR1CS<SYS, T, U>(filePrefix),
m_booleanityX(x_IC),
m_booleanityY(y_IC)
{
initB();
this->init_A_from_B();
}
private:
void initB() {
this->clearAppend(this->m_csB);
R1Variable<T> x(1), y(2), z(3);
this->m_csB.addConstraint(x + y - z == x * y);
if (m_booleanityX) this->addBooleanity_B(x);
if (m_booleanityY) this->addBooleanity_B(y);
this->m_csB.swap_AB_if_beneficial();
this->m_witnessB.assignVar(x, T::one());
this->m_witnessB.assignVar(y, T::one());
this->m_witnessB.assignVar(z, T::one());
this->m_inputB.assignVar(x, T::one());
this->m_inputB.assignVar(y, T::one());
this->finalize(this->m_csB);
}
const bool m_booleanityX;
const bool m_booleanityY;
};
////////////////////////////////////////////////////////////////////////////////
// single XOR gate
//
template <template <typename> class SYS, typename T, typename U>
class AutoTestR1CS_XOR : public AutoTestR1CS<SYS, T, U>
{
public:
AutoTestR1CS_XOR(const bool x_IC, const bool y_IC, const std::string& filePrefix)
: AutoTestR1CS<SYS, T, U>(filePrefix),
m_booleanityX(x_IC),
m_booleanityY(y_IC)
{
initB();
this->init_A_from_B();
}
private:
void initB() {
this->clearAppend(this->m_csB);
R1Variable<T> x(1), y(2), z(3);
const auto TWO = T::one() + T::one();
this->m_csB.addConstraint(x + y - z == (TWO * x) * y);
if (m_booleanityX) this->addBooleanity_B(x);
if (m_booleanityY) this->addBooleanity_B(y);
this->m_csB.swap_AB_if_beneficial();
this->m_witnessB.assignVar(x, T::one());
this->m_witnessB.assignVar(y, T::one());
this->m_witnessB.assignVar(z, T::zero());
this->m_inputB.assignVar(x, T::one());
this->m_inputB.assignVar(y, T::one());
this->finalize(this->m_csB);
}
const bool m_booleanityX;
const bool m_booleanityY;
};
////////////////////////////////////////////////////////////////////////////////
// single CMPLMNT gate
//
template <template <typename> class SYS, typename T, typename U>
class AutoTestR1CS_CMPLMNT : public AutoTestR1CS<SYS, T, U>
{
public:
AutoTestR1CS_CMPLMNT(const bool x_IC, const std::string& filePrefix)
: AutoTestR1CS<SYS, T, U>(filePrefix),
m_booleanityX(x_IC)
{
initB();
this->init_A_from_B();
}
private:
void initB() {
this->clearAppend(this->m_csB);
R1Variable<T> x(1), y(2);
this->m_csB.addConstraint(x + y == T::one());
if (m_booleanityX) this->addBooleanity_B(x);
this->m_csB.swap_AB_if_beneficial();
this->m_witnessB.assignVar(x, T::zero());
this->m_witnessB.assignVar(y, T::one());
this->m_inputB.assignVar(x, T::zero());
this->finalize(this->m_csB);
}
const bool m_booleanityX;
};
////////////////////////////////////////////////////////////////////////////////
// unsoundness circuit from: A Note on the Unsoundness of vnTinyRAM's SNARK
//
// Six scalar wires, three multiplication gates:
//
// c1, c2, c3 are free
// c4 = c1 * c2
// c5 = c1 * c3
// c6 = c4 * c5
//
// To demonstrate unsoundness, the input wires are: c1, c2, c3, c6.
// As input variables must be first, it is convenient to relabel the
// wires so the circuit is:
//
// d1, d2, d3 are free
// d5 = d1 * d2
// d6 = d1 * d3
// d4 = d5 * d6
//
// Then the input wires are: d1, d2, d3, d4.
//
template <template <typename> class SYS, typename T, typename U>
class AutoTestR1CS_Soundness : public AutoTestR1CS<SYS, T, U>
{
public:
// may be unsound
AutoTestR1CS_Soundness(const unsigned long c1,
const unsigned long c2,
const unsigned long c3,
const unsigned long c4,
const unsigned long c5,
const unsigned long c6,
const std::string& filePrefix)
: AutoTestR1CS<SYS, T, U>(filePrefix),
m_d1(c1), // d1 is c1
m_d2(c2), // d2 is c2
m_d3(c3), // d3 is c3
m_d4(c6), // d4 is c6
m_d5(c4), // d5 is c4
m_d6(c5) // d6 is c5
{
initB();
this->init_A_from_B();
}
// will be sound as input is consistent with witness
AutoTestR1CS_Soundness(const unsigned long c1,
const unsigned long c2,
const unsigned long c3,
const std::string& filePrefix)
: AutoTestR1CS_Soundness{c1, c2, c3, c1*c2, c1*c3, c1*c1*c2*c3, filePrefix}
{}
private:
void initB() {
this->clearAppend(this->m_csB);
R1Variable<T> d1(1), d2(2), d3(3), d4(4), d5(5), d6(6);
this->m_csB.addConstraint(d1 * d2 == d5);
this->m_csB.addConstraint(d1 * d3 == d6);
this->m_csB.addConstraint(d5 * d6 == d4);
this->m_csB.swap_AB_if_beneficial();
// witness always consistent
this->m_witnessB.assignVar(d1, T(m_d1));
this->m_witnessB.assignVar(d2, T(m_d2));
this->m_witnessB.assignVar(d3, T(m_d3));
this->m_witnessB.assignVar(d4, T(m_d1 * m_d1 * m_d2 * m_d3));
this->m_witnessB.assignVar(d5, T(m_d1 * m_d2));
this->m_witnessB.assignVar(d6, T(m_d1 * m_d3));
// public inputs may be inconsistent
this->m_inputB.assignVar(d1, T(m_d1));
this->m_inputB.assignVar(d2, T(m_d2));
this->m_inputB.assignVar(d3, T(m_d3));
this->m_inputB.assignVar(d4, T(m_d4));
this->finalize(this->m_csB);
}
const unsigned long m_d1, m_d2, m_d3, m_d4, m_d5, m_d6;
};
} // namespace snarklib
#endif