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65 lines
1.2 KiB
65 lines
1.2 KiB
/**
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@file
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@brief a sample of BLS signature
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see https://github.com/herumi/bls
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@author MITSUNARI Shigeo(@herumi)
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@license modified new BSD license
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http://opensource.org/licenses/BSD-3-Clause
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*/
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#include <mcl/bn256.hpp>
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#if CYBOZU_CPP_VERSION >= CYBOZU_CPP_VERSION_CPP11
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#include <random>
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std::random_device g_rg;
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#else
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#include <cybozu/random_generator.hpp>
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cybozu::RandomGenerator g_rg;
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#endif
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using namespace mcl::bn256;
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void Hash(G1& P, const std::string& m)
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{
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Fp t;
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t.setMsg(m);
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BN::mapToG1(P, t);
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}
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int main(int argc, char *argv[])
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{
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std::string m = argc == 1 ? "hello mcl" : argv[1];
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// setup parameter
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bn256init();
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G2 Q;
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BN::mapToG2(Q, 1);
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// generate secret key and public key
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Fr s;
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s.setRand(g_rg);
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std::cout << "secret key " << s << std::endl;
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G2 pub;
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G2::mul(pub, Q, s); // pub = sQ
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std::cout << "public key " << pub << std::endl;
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// sign
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G1 sign;
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{
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G1 Hm;
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Hash(Hm, m);
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G1::mul(sign, Hm, s); // sign = s H(m)
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}
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std::cout << "msg " << m << std::endl;
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std::cout << "sign " << sign << std::endl;
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// verify
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{
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Fp12 e1, e2;
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G1 Hm;
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Hash(Hm, m);
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BN::pairing(e1, sign, Q); // e1 = e(sign, Q)
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BN::pairing(e2, Hm, pub); // e2 = e(Hm, sQ)
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std::cout << "verify " << (e1 == e2 ? "ok" : "ng") << std::endl;
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}
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}
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