circomlib/circuits/mux1.circom

/*
    Copyright 2018 0KIMS association.

    This file is part of circom (Zero Knowledge Circuit Compiler).

    circom 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.

    circom 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 circom. If not, see <https://www.gnu.org/licenses/>.
*/

template MultiMux1(n) {
    signal input c[n][2];  // Constants
    signal input s;   // Selector
    signal output out[n];

    for (var i=0; i<n; i++) {

        out[i] <== (c[i][1] - c[i][0])*s + c[i][0];

    }
}

template Mux1() {
    var i;
    signal input c[2];  // Constants
    signal input s;   // Selector
    signal output out;

    component mux = MultiMux1(1);

    for (i=0; i<2; i++) {
        mux.c[0][i] <== c[i];
    }

    s ==> mux.s;

    mux.out[0] ==> out;
}