mirror of https://github.com/vacp2p/research.git
63 lines
1.3 KiB
Plaintext
63 lines
1.3 KiB
Plaintext
// based on https://github.com/zcash/librustzcash/blob/master/sapling-crypto/src/circuit/uint32.rs
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include "../../node_modules/circomlib/circuits/bitify.circom";
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template Uint32Add(n) {
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signal input nums_bits[n][32];
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signal output out_bits[32];
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var result_num_bits = 32 + n - 1;
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signal result_bits[result_num_bits];
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signal nums_vals[n];
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signal result_val[n];
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var coeff;
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var num_lc;
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var lc = 0;
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for (var i = 0; i < n; i++) {
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num_lc = 0;
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coeff = 1;
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for (var j = 0; j < 32; j++) {
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lc += nums_bits[i][j]*coeff;
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num_lc += nums_bits[i][j]*coeff;
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coeff *= 2;
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}
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nums_vals[i] <== num_lc;
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if (i == 0) {
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result_val[i] <== nums_vals[i];
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} else {
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result_val[i] <== result_val[i-1] + nums_vals[i];
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}
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}
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var result_lc = 0;
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coeff = 1;
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for (var i = 0; i < result_num_bits; i++) {
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result_bits[i] <-- (result_val[n-1] >> i) & 1;
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result_bits[i] * (result_bits[i] - 1) === 0;
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result_lc += result_bits[i]*coeff;
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coeff *= 2;
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}
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result_lc === lc;
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for (var i = 0; i < 32; i++) {
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out_bits[i] <== result_bits[i];
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}
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}
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template Uint32Xor() {
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signal input a_bits[32];
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signal input b_bits[32];
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signal output out_bits[32];
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for (var i = 0; i < 32; i++) {
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out_bits[i] <== a_bits[i] + b_bits[i] - 2*a_bits[i]*b_bits[i];
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}
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}
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