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97 lines
2.3 KiB
97 lines
2.3 KiB
/*
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tripartie Diffie-Hellman
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*/
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#include <iostream>
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#include <fstream>
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#include <cybozu/random_generator.hpp>
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#include <mcl/bn256.hpp>
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#include <cybozu/option.hpp>
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static cybozu::RandomGenerator rg;
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const std::string skSuf = ".sk.txt";
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const std::string pkSuf = ".pk.txt";
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using namespace mcl::bn256;
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void keygen(const std::string& user)
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{
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if (user.empty()) {
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throw cybozu::Exception("keygen:user is empty");
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}
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const char *aa = "12723517038133731887338407189719511622662176727675373276651903807414909099441";
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const char *ab = "4168783608814932154536427934509895782246573715297911553964171371032945126671";
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const char *ba = "13891744915211034074451795021214165905772212241412891944830863846330766296736";
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const char *bb = "7937318970632701341203597196594272556916396164729705624521405069090520231616";
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bn256init();
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G2 Q(Fp2(aa, ab), Fp2(ba, bb));
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G1 P(-1, 1);
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Fr s;
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s.setRand(rg);
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G1::mul(P, P, s);
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G2::mul(Q, Q, s);
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{
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std::string name = user + skSuf;
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std::ofstream ofs(name.c_str(), std::ios::binary);
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ofs << s << std::endl;
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}
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{
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std::string name = user + pkSuf;
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std::ofstream ofs(name.c_str(), std::ios::binary);
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ofs << P << std::endl;
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ofs << Q << std::endl;
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}
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}
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void load(G1& P, G2& Q, const std::string& fileName)
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{
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std::ifstream ifs(fileName.c_str(), std::ios::binary);
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ifs >> P >> Q;
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}
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void share(const std::string& skFile, const std::string& pk1File, const std::string& pk2File)
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{
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bn256init();
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Fr s;
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G1 P1, P2;
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G2 Q1, Q2;
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{
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std::ifstream ifs(skFile.c_str(), std::ios::binary);
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ifs >> s;
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}
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load(P1, Q1, pk1File);
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load(P2, Q2, pk2File);
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Fp12 e;
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BN::pairing(e, P1, Q2);
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{
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// verify(not necessary)
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Fp12 e2;
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BN::pairing(e2, P2, Q1);
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if (e != e2) {
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throw cybozu::Exception("share:bad public key file") << e << e2;
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}
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}
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Fp12::pow(e, e, s);
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std::cout << "share key:\n" << e << std::endl;
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}
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int main(int argc, char *argv[])
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try
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{
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if (argc == 3 && strcmp(argv[1], "keygen") == 0) {
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keygen(argv[2]);
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} else if (argc == 5 && strcmp(argv[1], "share") == 0) {
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share(argv[2], argv[3], argv[4]);
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} else {
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fprintf(stderr, "tri-dh.exe keygen <user name>\n");
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fprintf(stderr, "tri-dh.exe share <secret key file> <public key1 file> <public key2 file>\n");
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return 1;
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}
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} catch (std::exception& e) {
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printf("ERR %s\n", e.what());
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return 1;
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}
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