1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
/**
@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>
#include <iostream>
using namespace mcl::bn256;
void Hash(G1& P, const std::string& m)
{
Fp t;
t.setHashOf(m);
mapToG1(P, t);
}
void KeyGen(Fr& s, G2& pub, const G2& Q)
{
s.setRand();
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);
pairing(e1, sign, Q); // e1 = e(sign, Q)
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
initPairing();
G2 Q;
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;
}
|
