snarkjs/src/futils.js
2018-10-21 19:41:44 +02:00

54 lines
1.3 KiB
JavaScript

/*
Copyright 2018 0kims association.
This file is part of snarkjs.
snarkjs is a free software: you can redistribute it and/or
modify it under the terms of the GNU General Public License as published by the
Free Software Foundation, either version 3 of the License, or (at your option)
any later version.
snarkjs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
You should have received a copy of the GNU General Public License along with
snarkjs. If not, see <https://www.gnu.org/licenses/>.
*/
const bigInt = require("./bigint.js");
exports.mulScalar = (F, base, e) =>{
let res = F.zero;
let rem = bigInt(e);
let exp = base;
while (! rem.isZero()) {
if (rem.isOdd()) {
res = F.add(res, exp);
}
exp = F.double(exp);
rem = rem.shr(1);
}
return res;
};
exports.exp = (F, base, e) =>{
let res = F.one;
let rem = bigInt(e);
let exp = base;
while (! rem.isZero()) {
if (rem.isOdd()) {
res = F.mul(res, exp);
}
exp = F.square(exp);
rem = rem.shr(1);
}
return res;
};