forked from tornado-packages/archive-monorepo
75 lines
1.8 KiB
Plaintext
75 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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// Returns 1 if in (in binary) > ct
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template CompConstant(ct) {
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signal input in[254];
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signal output out;
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signal parts[127];
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signal sout;
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var clsb;
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var cmsb;
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var slsb;
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var smsb;
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var sum=0;
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var b = (1 << 128) -1;
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var a = 1;
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var e = 1;
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var i;
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for (i=0;i<127; i++) {
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clsb = (ct >> (i*2)) & 1;
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cmsb = (ct >> (i*2+1)) & 1;
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slsb = in[i*2];
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smsb = in[i*2+1];
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if ((cmsb==0)&(clsb==0)) {
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parts[i] <== -b*smsb*slsb + b*smsb + b*slsb;
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} else if ((cmsb==0)&(clsb==1)) {
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parts[i] <== a*smsb*slsb - a*slsb + b*smsb - a*smsb + a;
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} else if ((cmsb==1)&(clsb==0)) {
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parts[i] <== b*smsb*slsb - a*smsb + a;
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} else {
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parts[i] <== -a*smsb*slsb + a;
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}
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sum = sum + parts[i];
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b = b -e;
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a = a +e;
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e = e*2;
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}
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sout <== sum;
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component num2bits = Num2Bits(135);
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num2bits.in <== sout;
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out <== num2bits.out[127];
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}
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