Jordi Baylina
6 years ago
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# javascript implementation of zkSnark |
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This is a javascript implementation of zkSnarks. |
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This library allows to do the trusted setup, generate proofs and verify the proofs. |
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This library uses the compiled circuits generated by the jaz compiler. |
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## Install |
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``` |
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npm install zkSnark |
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``` |
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## Usage |
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### import |
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``` |
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const zkSnark = require("zksnark"); |
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``` |
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### Load a circuit. |
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``` |
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// "myCircuit.cir" is the output of the jaz compiler |
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const circuitDef = JSON.parse(fs.readFileSync("myCircuit.cir", "utf8")); |
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const circuit = new zkSnark.Circuit(circuitDef); |
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``` |
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### Inspect the circuit. |
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``` |
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// `signalId` can always be a number or an alias string |
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circuit.m; // number of constrains |
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circuit.n; // number of signals |
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circuit.p; // number of public signals (nPublicInputs + nOutputs) |
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// The array of signals is always sorted in this order: |
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// [ outputs, publicInputs, privedInputs, internalSignals, constants] |
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// returns a,b and c coeficients of the `signalId` on a given `constrain` |
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circuit.a(constrain, signalId) |
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circuit.b(constrain, signalId) |
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circuit.c(constrain, signalId) |
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circuit.nOutputs // number of public outputs |
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circuit.nPublicInputs // number of public inputs |
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circuit.nPrivateInputs // number of private inputs |
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circuit.nInputs // number of inputs ( nPublicInputs + nPrivateInputs) |
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circuit.outputIdx(i) // returns the index of the i'th output |
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circuit.inputIdx(i) // returns the index of the i'th input |
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circuit.inputPublicIdx(i) // returns the index of the i'th public input |
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circuit.inputPrivateIdx(i) // returns the index of the i'th private input |
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// returns signal Idx given a signalId |
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// if the idx >= n , it is a constant |
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// if the idx == -1, the signal does not exist |
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circuit.signalId2idx(signalId); |
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// returns an array aliases names for a given signalId |
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circuit.signalNames(signalId) |
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// input is a key value object where keys are the signal names |
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// of all the inputs (public and private) |
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// returns an array of values that represent the witness |
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circuit.generateWitness(input) |
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``` |
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### Trusted setup |
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``` |
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const setup = zkSnark.setup(circuit); |
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fs.writeFileSink("myCircuit.vk_proof", JSON.stringify(setup.vk_proof), "utf8"); |
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fs.writeFileSink("myCircuit.vk_verifier", JSON.stringify(setup.vk_verifier), "utf8"); |
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setup.toxic // Must be discarded. |
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``` |
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### Generate proof |
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``` |
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const circuitDef = JSON.parse(fs.readFileSync("myCircuit.cir", "utf8")); |
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const circuit = new zkSnark.Circuit(circuitDef); |
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const input = { |
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"main.pubIn1": "123", |
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"main.out1": "456" |
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} |
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const witness = circuit.generateWitness(input); |
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const vk_proof = JSON.parse(fs.readFileSync("myCircuit.vk_proof", "utf8")); |
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const {proof, publicSignals} = zkSnark.genProof(vk_proof, witness); |
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``` |
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### Verifier |
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``` |
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const vk_verifier = JSON.parse(fs.readFileSync("myCircuit.vk_verifier", "utf8")); |
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if (zkSnark.isValid(vk_verifier, proof, publicSignals)) { |
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console.log("The proof is valid"); |
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} else { |
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console.log("The proof is not valid"); |
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} |
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``` |
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