85 lines
2.7 KiB
C++
85 lines
2.7 KiB
C++
/**
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* @file wraplibsnark.cpp
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* @author Jacob Eberhardt <jacob.eberhardt@tu-berlin.de
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* @author Dennis Kuhnert <dennis.kuhnert@campus.tu-berlin.de>
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* @date 2017
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*/
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#include "util.hpp"
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using namespace std;
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// conversion byte[32] <-> libsnark bigint.
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libff::bigint<libff::alt_bn128_r_limbs> libsnarkBigintFromBytes(const uint8_t* _x)
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{
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libff::bigint<libff::alt_bn128_r_limbs> x;
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for (unsigned i = 0; i < 4; i++) {
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for (unsigned j = 0; j < 8; j++) {
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x.data[3 - i] |= uint64_t(_x[i * 8 + j]) << (8 * (7-j));
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}
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}
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return x;
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}
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std::string HexStringFromLibsnarkBigint(libff::bigint<libff::alt_bn128_r_limbs> _x){
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uint8_t x[32];
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for (unsigned i = 0; i < 4; i++)
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for (unsigned j = 0; j < 8; j++)
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x[i * 8 + j] = uint8_t(uint64_t(_x.data[3 - i]) >> (8 * (7 - j)));
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std::stringstream ss;
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ss << std::setfill('0');
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for (unsigned i = 0; i<32; i++) {
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ss << std::hex << std::setw(2) << (int)x[i];
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}
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std::string str = ss.str();
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return str.erase(0, min(str.find_first_not_of('0'), str.size()-1));
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}
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std::string outputPointG1AffineAsHex(libff::alt_bn128_G1 _p)
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{
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libff::alt_bn128_G1 aff = _p;
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aff.to_affine_coordinates();
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return
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"0x" +
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HexStringFromLibsnarkBigint(aff.X.as_bigint()) +
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", 0x" +
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HexStringFromLibsnarkBigint(aff.Y.as_bigint());
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}
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std::string outputPointG1AffineAsHexJson(libff::alt_bn128_G1 _p)
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{
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libff::alt_bn128_G1 aff = _p;
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aff.to_affine_coordinates();
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return
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"[\"0x" +
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HexStringFromLibsnarkBigint(aff.X.as_bigint()) +
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"\", \"0x" +
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HexStringFromLibsnarkBigint(aff.Y.as_bigint())+"\"]";
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}
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std::string outputPointG2AffineAsHex(libff::alt_bn128_G2 _p)
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{
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libff::alt_bn128_G2 aff = _p;
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aff.to_affine_coordinates();
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return
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"[0x" +
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HexStringFromLibsnarkBigint(aff.X.c1.as_bigint()) + ", 0x" +
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HexStringFromLibsnarkBigint(aff.X.c0.as_bigint()) + "], [0x" +
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HexStringFromLibsnarkBigint(aff.Y.c1.as_bigint()) + ", 0x" +
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HexStringFromLibsnarkBigint(aff.Y.c0.as_bigint()) + "]";
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}
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std::string outputPointG2AffineAsHexJson(libff::alt_bn128_G2 _p)
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{
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libff::alt_bn128_G2 aff = _p;
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aff.to_affine_coordinates();
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return
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"[[\"0x" +
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HexStringFromLibsnarkBigint(aff.X.c1.as_bigint()) + "\", \"0x" +
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HexStringFromLibsnarkBigint(aff.X.c0.as_bigint()) + "\"], [\"0x" +
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HexStringFromLibsnarkBigint(aff.Y.c1.as_bigint()) + "\", \"0x" +
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HexStringFromLibsnarkBigint(aff.Y.c0.as_bigint()) + "\"]]";
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}
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