-
Notifications
You must be signed in to change notification settings - Fork 0
/
sss.js
49 lines (32 loc) · 879 Bytes
/
sss.js
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
class Shamir {
solve_polynomial(P, x, coeff) {
let y = 0;
for (let [i, v] of coeff.entries()) {
y += x ** i * v;
}
return y % P;
}
generate_shares(K, P, coeff) {
let shares = [];
for (let x = 1; x < K + 1; x++) {
shares.push([
x, this.solve_polynomial(P, x, coeff)
]);
}
return shares;
}
lagrange_optimized(shares) {
let sums = 0;
for (let j = 0; j < shares.length; j++) {
let products = 1;
for (let m = 0; m < shares.length; m++) {
if (m != j)
products *= (shares[m][0]) / (shares[m][0] - shares[j][0]);
}
products *= shares[j][1];
sums += products;
}
return sums;
}
}
module.exports = Shamir;