circomlib-ml/circuits/util.circom

pragma circom 2.0.3;

include "../node_modules/circomlib/circuits/Sign.circom";
include "../node_modules/circomlib/circuits/bitify.circom";

template IsNegative() {
    signal input in;
    signal output out;

    component num2Bits = Num2Bits(254);
    num2Bits.in <== in;
    component sign = Sign();
    
    for (var i = 0; i < 254; i++) {
        sign.in[i] <== num2Bits.out[i];
    }

    out <== sign.sign;
}

template IsPositive() {
    signal input in;
    signal output out;

    component num2Bits = Num2Bits(254);
    num2Bits.in <== in;
    component sign = Sign();
    
    for (var i = 0; i < 254; i++) {
        sign.in[i] <== num2Bits.out[i];
    }

    out <== 1 - sign.sign;
}

template Sum(nInputs) {
    signal input in[nInputs];
    signal output out;

    signal partialSum[nInputs];
    partialSum[0] <== in[0];
    
    for (var i=1; i<nInputs; i++) {
        partialSum[i] <== partialSum[i-1] + in[i];
    }

    out <== partialSum[nInputs-1];
}