56 lines
1.9 KiB
Plaintext
56 lines
1.9 KiB
Plaintext
include "../node_modules/circomlib/circuits/bitify.circom";
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include "../node_modules/circomlib/circuits/pedersen.circom";
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include "merkleTree.circom";
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// computes Pedersen(nullifier + secret)
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template CommitmentHasher() {
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signal input nullifier;
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signal input secret;
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signal output commitment;
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signal output nullifierHash;
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component commitmentHasher = Pedersen(496);
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component nullifierHasher = Pedersen(248);
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component nullifierBits = Num2Bits(248);
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component secretBits = Num2Bits(248);
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nullifierBits.in <== nullifier;
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secretBits.in <== secret;
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for (var i = 0; i < 248; i++) {
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nullifierHasher.in[i] <== nullifierBits.out[i];
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commitmentHasher.in[i] <== nullifierBits.out[i];
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commitmentHasher.in[i + 248] <== secretBits.out[i];
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}
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commitment <== commitmentHasher.out[0];
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nullifierHash <== nullifierHasher.out[0];
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}
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// Verifies that commitment that corresponds to given secret and nullifier is included in the merkle tree of deposits
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template Withdraw(levels) {
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signal input root;
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signal input nullifierHash;
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signal input recipient; // not taking part in any computations
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signal input relayer; // not taking part in any computations
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signal input fee; // not taking part in any computations
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signal input refund; // not taking part in any computations
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signal private input nullifier;
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signal private input secret;
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signal private input pathElements[levels];
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signal private input pathIndices[levels];
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component hasher = CommitmentHasher();
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hasher.nullifier <== nullifier;
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hasher.secret <== secret;
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hasher.nullifierHash === nullifierHash;
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component tree = MerkleTreeChecker(levels);
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tree.leaf <== hasher.commitment;
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tree.root <== root;
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for (var i = 0; i < levels; i++) {
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tree.pathElements[i] <== pathElements[i];
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tree.pathIndices[i] <== pathIndices[i];
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}
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}
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component main = Withdraw(20);
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