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80 lines
2.8 KiB
80 lines
2.8 KiB
/*
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Copyright 2019 0KIMS association.
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This file is part of websnark (Web Assembly zkSnark Prover).
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websnark is a free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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websnark is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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License for more details.
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You should have received a copy of the GNU General Public License
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along with websnark. If not, see <https://www.gnu.org/licenses/>.
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*/
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const bigInt = require("big-integer");
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const buildF1m =require("./build_f1m.js");
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module.exports = function buildF1(module, _q, _prefix, _f1mPrefix, _intPrefix) {
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const q = bigInt(_q);
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const n64 = Math.floor((q.minus(1).bitLength() - 1)/64) +1;
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const n8 = n64*8;
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const prefix = _prefix || "f1";
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if (module.modules[prefix]) return prefix; // already builded
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module.modules[prefix] = {
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n64: n64
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};
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const intPrefix = _intPrefix || "int";
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const f1mPrefix = buildF1m(module, q, _f1mPrefix, intPrefix);
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const pR2 = module.modules[f1mPrefix].pR2;
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const pq = module.modules[f1mPrefix].pq;
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function buildMul() {
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const pAux1 = module.alloc(n8);
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const f = module.addFunction(prefix+ "_mul");
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f.addParam("x", "i32");
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f.addParam("y", "i32");
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f.addParam("r", "i32");
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const c = f.getCodeBuilder();
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f.addCode(c.call(f1mPrefix + "_mul", c.getLocal("x"), c.getLocal("y"), c.i32_const(pAux1)));
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f.addCode(c.call(f1mPrefix + "_mul", c.i32_const(pAux1), c.i32_const(pR2), c.getLocal("r")));
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}
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function buildInverse() {
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const f = module.addFunction(prefix+ "_inverse");
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f.addParam("x", "i32");
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f.addParam("r", "i32");
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const c = f.getCodeBuilder();
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f.addCode(c.call(intPrefix + "_inverseMod", c.getLocal("x"), c.i32_const(pq), c.getLocal("r")));
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}
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buildMul();
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buildInverse();
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module.exportFunction(f1mPrefix + "_add", prefix + "_add");
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module.exportFunction(f1mPrefix + "_sub", prefix + "_sub");
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module.exportFunction(f1mPrefix + "_neg", prefix + "_neg");
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module.exportFunction(prefix + "_mul");
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module.exportFunction(prefix + "_inverse");
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module.exportFunction(f1mPrefix + "_copy", prefix+"_copy");
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module.exportFunction(f1mPrefix + "_zero", prefix+"_zero");
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module.exportFunction(f1mPrefix + "_one", prefix+"_one");
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module.exportFunction(f1mPrefix + "_isZero", prefix+"_isZero");
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module.exportFunction(f1mPrefix + "_eq", prefix+"_eq");
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return prefix;
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};
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