57 lines
1.0 KiB
Plaintext
57 lines
1.0 KiB
Plaintext
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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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