You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
77 lines
1.5 KiB
77 lines
1.5 KiB
/**
|
|
@file
|
|
@brief a sample of BLS signature
|
|
see https://github.com/herumi/bls
|
|
@author MITSUNARI Shigeo(@herumi)
|
|
@license modified new BSD license
|
|
http://opensource.org/licenses/BSD-3-Clause
|
|
|
|
*/
|
|
#include <mcl/bn256.hpp>
|
|
|
|
#if CYBOZU_CPP_VERSION >= CYBOZU_CPP_VERSION_CPP11
|
|
#include <random>
|
|
std::random_device g_rg;
|
|
#else
|
|
#include <cybozu/random_generator.hpp>
|
|
cybozu::RandomGenerator g_rg;
|
|
#endif
|
|
|
|
using namespace mcl::bn256;
|
|
|
|
void Hash(G1& P, const std::string& m)
|
|
{
|
|
Fp t;
|
|
t.setHashOf(m);
|
|
BN::mapToG1(P, t);
|
|
}
|
|
|
|
void KeyGen(Fr& s, G2& pub, const G2& Q)
|
|
{
|
|
s.setRand(g_rg);
|
|
G2::mul(pub, Q, s); // pub = sQ
|
|
}
|
|
|
|
void Sign(G1& sign, const Fr& s, const std::string& m)
|
|
{
|
|
G1 Hm;
|
|
Hash(Hm, m);
|
|
G1::mul(sign, Hm, s); // sign = s H(m)
|
|
}
|
|
|
|
bool Verify(const G1& sign, const G2& Q, const G2& pub, const std::string& m)
|
|
{
|
|
Fp12 e1, e2;
|
|
G1 Hm;
|
|
Hash(Hm, m);
|
|
BN::pairing(e1, sign, Q); // e1 = e(sign, Q)
|
|
BN::pairing(e2, Hm, pub); // e2 = e(Hm, sQ)
|
|
return e1 == e2;
|
|
}
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
std::string m = argc == 1 ? "hello mcl" : argv[1];
|
|
|
|
// setup parameter
|
|
bn256init();
|
|
G2 Q;
|
|
BN::mapToG2(Q, 1);
|
|
|
|
// generate secret key and public key
|
|
Fr s;
|
|
G2 pub;
|
|
KeyGen(s, pub, Q);
|
|
std::cout << "secret key " << s << std::endl;
|
|
std::cout << "public key " << pub << std::endl;
|
|
|
|
// sign
|
|
G1 sign;
|
|
Sign(sign, s, m);
|
|
std::cout << "msg " << m << std::endl;
|
|
std::cout << "sign " << sign << std::endl;
|
|
|
|
// verify
|
|
bool ok = Verify(sign, Q, pub, m);
|
|
std::cout << "verify " << (ok ? "ok" : "ng") << std::endl;
|
|
}
|
|
|