circomlib/circuits/mux3.circom

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2018-12-16 13:27:29 +03:00
/*
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 MultiMux3(n) {
signal input c[n][8]; // Constants
signal input s[3]; // Selector
signal output out[n];
signal a210[n];
signal a21[n];
signal a20[n];
signal a2[n];
signal a10[n];
signal a1[n];
signal a0[n];
signal a[n];
// 4 constrains for the intermediary variables
signal s10;
s10 <== s[1] * s[0];
for (var i=0; i<n; i++) {
a210[i] <== ( c[i][ 7]-c[i][ 6]-c[i][ 5]+c[i][ 4] - c[i][ 3]+c[i][ 2]+c[i][ 1]-c[i][ 0] ) * s10;
a21[i] <== ( c[i][ 6]-c[i][ 4]-c[i][ 2]+c[i][ 0] ) * s[1];
a20[i] <== ( c[i][ 5]-c[i][ 4]-c[i][ 1]+c[i][ 0] ) * s[0];
a2[i] <== ( c[i][ 4]-c[i][ 0] );
a10[i] <== ( c[i][ 3]-c[i][ 2]-c[i][ 1]+c[i][ 0] ) * s10;
a1[i] <== ( c[i][ 2]-c[i][ 0] ) * s[1];
a0[i] <== ( c[i][ 1]-c[i][ 0] ) * s[0];
a[i] <== ( c[i][ 0] )
out[i] <== ( a210[i] + a21[i] + a20[i] + a2[i] ) * s[2] +
( a10[i] + a1[i] + a0[i] + a[i] );
}
}
template Mux3() {
var i;
signal input c[8]; // Constants
signal input s[3]; // Selector
signal output out;
component mux = MultiMux3(1);
for (i=0; i<8; i++) {
mux.c[0][i] <== c[i];
}
for (i=0; i<3; i++) {
s[i] ==> mux.s[i];
}
mux.out[0] ==> out;
}