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poma 2019-07-09 16:05:30 +03:00
commit 12cc76f3b1
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circuits/merkleTree.circom Normal file
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include "../node_modules/circomlib/circuits/bitify.circom";
include "../node_modules/circomlib/circuits/mimcsponge.circom";
template HashLeftRight(rounds) {
signal input left;
signal input right;
signal output hash;
component hasher = MiMCSponge(2, rounds, 1);
hasher.ins[0] <== left;
hasher.ins[1] <== right;
hasher.k <== 0;
hash <== hasher.outs[0];
}
template Selector() {
signal input inputElement;
signal input pathElement;
signal input pathIndex;
signal output left;
signal output right;
signal leftSelector1;
signal leftSelector2;
signal rightSelector1;
signal rightSelector2;
pathIndex * (1-pathIndex) === 0
leftSelector1 <== (1 - pathIndex) * inputElement;
leftSelector2 <== (pathIndex) * pathElement;
rightSelector1 <== (pathIndex) * inputElement;
rightSelector2 <== (1 - pathIndex) * pathElement;
left <== leftSelector1 + leftSelector2;
right <== rightSelector1 + rightSelector2;
}
template MerkleTree(levels, rounds) {
signal input leaf;
signal private input pathElements[levels];
signal private input pathIndex[levels];
signal output root;
component selectors[levels];
component hashers[levels];
for (var i = 0; i < levels; i++) {
selectors[i] = Selector();
hashers[i] = HashLeftRight(rounds);
selectors[i].pathElement <== pathElements[i];
selectors[i].pathIndex <== pathIndex[i];
hashers[i].left <== selectors[i].left;
hashers[i].right <== selectors[i].right;
}
selectors[0].inputElement <== leaf;
for (var i = 1; i < levels; i++) {
selectors[i].inputElement <== hashers[i-1].hash;
}
root <== hashers[levels - 1].hash;
}