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Withdraw circuit check secret in MerkleTree Root

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arnaucube
2020-05-11 09:08:23 +02:00
parent e466578ddc
commit 95d4f210be
2 changed files with 60 additions and 28 deletions
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56
circuits/withdraw.circom
View File

@@ -3,49 +3,61 @@
WARNING: WIP, very initial version of the miksi circuit
+--------+
PUB_coinCode+------->+ |
| | +----+
PUB_amount+--------->+Poseidon+------->+ == +<-----+PUB_commitment
| | +----+
PRI_secret+--------->+ |
+--------+
+----+
PUB_address+--->+ != +<---+0
+----+
+----------+
| |
PUB_nullifier+------>+----------+ | |
PUB_coinCode+------->+ | | SMT +<------+PRI_siblings
| | | Poseidon |
PUB_amount+--------->+ Poseidon +------------->+ Verifier |
| | | +<------+PUB_root
PRI_secret+--------->+ | | | +
+----------+ +----------+ |
|
+----+ +----+ |
PUB_address+--->+ != +<-------+0+------>+ != +<-------+
+----+ +----+
*/
include "../node_modules/circomlib/circuits/babyjub.circom";
include "../node_modules/circomlib/circuits/comparators.circom";
include "../node_modules/circomlib/circuits/poseidon.circom";
include "../node_modules/circomlib/circuits/bitify.circom";
include "../node_modules/circomlib/circuits/smt/smtverifier.circom";
include "../node_modules/circomlib/circuits/smt/smtprocessor.circom";
template Withdraw() {
template Withdraw(nLevels) {
signal input coinCode;
signal input amount;
signal input commitment;
signal private input secret;
signal input nullifier;
signal private input siblings[nLevels];
signal input root;
signal input address;
component hash = Poseidon(3, 6, 8, 57);
component hash = Poseidon(4, 6, 8, 57);
hash.inputs[0] <== coinCode;
hash.inputs[1] <== amount;
hash.inputs[2] <== secret;
component eq = IsEqual();
eq.in[0] <== hash.out;
eq.in[1] <== commitment;
eq.out === 1;
hash.inputs[3] <== nullifier;
component z = IsZero();
z.in <== address;
z.out === 0;
component smtV = SMTVerifier(nLevels);
smtV.enabled <== 1;
smtV.fnc <== 0;
smtV.root <== root;
for (var i=0; i<nLevels; i++) {
smtV.siblings[i] <== siblings[i];
}
smtV.oldKey <== 0;
smtV.oldValue <== 0;
smtV.isOld0 <== 0;
smtV.key <== hash.out;
smtV.value <== 0;
}
component main = Withdraw();
component main = Withdraw(5);

32
test/circuits/withdraw.test.ts
View File

@@ -3,6 +3,7 @@ const tester = require("circom").tester;
const chai = require("chai");
const assert = chai.assert;
const circomlib = require("circomlib");
const smt = require("circomlib").smt;
export {};
@@ -16,20 +17,39 @@ describe("withdraw test", function () {
{reduceConstraints: false}
);
// const secret = Math.floor(Math.random()*1000).toString();
const secret = "123456789";
const nLevels = 5;
const secret = "1234567890";
const coinCode = "1";
const amount = "100";
const coinCode = "0";
const amount = '1000000000000000000';
const nullifier = "567891234";
const poseidon = circomlib.poseidon.createHash(6, 8, 57);
const commitment = poseidon([coinCode, amount, secret]).toString();
const commitment = poseidon([coinCode, amount, secret, nullifier]).toString();
// add commitment into SMT
let tree = await smt.newMemEmptyTrie();
await tree.insert(commitment, 0);
await tree.insert(1, 0);
await tree.insert(2, 0);
console.log("root", tree.root);
const res = await tree.find(commitment);
assert(res.found);
let siblings = res.siblings;
while (siblings.length < nLevels) {
siblings.push("0");
};
console.log("siblings", siblings);
let root = tree.root;
const witness = await circuit.calculateWitness({
"coinCode": coinCode,
"amount": amount,
"commitment": commitment,
"secret": secret,
"nullifier": nullifier,
"siblings": siblings,
"root": root,
"address": "987654321"
});
await circuit.checkConstraints(witness);