86 lines
1.8 KiB
Plaintext
86 lines
1.8 KiB
Plaintext
/*
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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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include "bitify.circom";
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include "binsum.circom";
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template IsZero() {
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signal input in;
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signal output out;
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signal inv;
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inv <-- in!=0 ? 1/in : 0;
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out <== -in*inv +1;
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in*out === 0;
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}
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template IsEqual() {
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signal input in[2];
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signal output out;
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component isz = IsZero();
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in[1] - in[0] ==> isz.in;
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isz.out ==> out;
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}
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template ForceEqualIfEnabled() {
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signal input enabled;
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signal input in[2];
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component isz = IsZero();
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in[1] - in[0] ==> isz.in;
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(1 - isz.out)*enabled === 0;
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}
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// N is the number of bits the input have.
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// The MSF is the sign bit.
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template LessThan(n) {
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signal input in[2];
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signal output out;
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component num2Bits0;
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component num2Bits1;
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component adder;
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adder = BinSum(n, 2);
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num2Bits0 = Num2Bits(n);
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num2Bits1 = Num2BitsNeg(n);
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in[0] ==> num2Bits0.in;
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in[1] ==> num2Bits1.in;
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var i;
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for (i=0;i<n;i++) {
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num2Bits0.out[i] ==> adder.in[0][i];
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num2Bits1.out[i] ==> adder.in[1][i];
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}
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adder.out[n-1] ==> out;
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}
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