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40 lines
1.1 KiB
40 lines
1.1 KiB
/*
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Copyright 2018 0KIMS association.
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This file is part of circom (Zero Knowledge Circuit Compiler).
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circom 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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circom 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 circom. If not, see <https://www.gnu.org/licenses/>.
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*/
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/*
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Assume sel is binary.
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If sel == 0 then outL = L and outR=R
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If sel == 1 then outL = R and outR=L
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*/
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template Switcher() {
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signal input sel;
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signal input L;
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signal input R;
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signal output outL;
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signal output outR;
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signal aux;
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aux <== (R-L)*sel; // We create aux in order to have only one multiplication
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outL <== aux + L;
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outR <== -aux + R;
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}
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