32 lines
1.1 KiB
Plaintext
32 lines
1.1 KiB
Plaintext
include "../node_modules/circomlib/circuits/bitify.circom";
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include "../node_modules/circomlib/circuits/poseidon.circom";
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include "../node_modules/circomlib/circuits/switcher.circom";
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// Verifies that merkle proof is correct for given merkle root and a leaf
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// pathIndices bits is an array of 0/1 selectors telling whether given pathElement is on the left or right side of merkle path
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template MerkleProof(levels) {
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signal input leaf;
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signal input pathElements[levels];
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signal input pathIndices;
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signal output root;
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component switcher[levels];
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component hasher[levels];
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component indexBits = Num2Bits(levels);
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indexBits.in <== pathIndices;
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for (var i = 0; i < levels; i++) {
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switcher[i] = Switcher();
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switcher[i].L <== i == 0 ? leaf : hasher[i - 1].out;
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switcher[i].R <== pathElements[i];
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switcher[i].sel <== indexBits.out[i];
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hasher[i] = Poseidon(2);
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hasher[i].inputs[0] <== switcher[i].outL;
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hasher[i].inputs[1] <== switcher[i].outR;
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}
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root <== hasher[levels - 1].out;
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}
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