New package for generating Poseidon proofs

README.md

@@ -141,6 +141,34 @@
                 </a>
             </td>
         </tr>
+        <tr>
+            <td>
+                <a href="https://github.com/privacy-scaling-explorations/zk-kit/tree/main/packages/poseidon-proof">
+                    @zk-kit/poseidon-proof
+                </a>
+                 <a href="https://zkkit.pse.dev/modules/_zk_kit_poseidon_proof.html">
+                    (docs)
+                </a>
+            </td>
+            <td>
+                <!-- NPM version -->
+                <a href="https://npmjs.org/package/@zk-kit/poseidon-proof">
+                    <img src="https://img.shields.io/npm/v/@zk-kit/poseidon-proof.svg?style=flat-square" alt="NPM version" />
+                </a>
+            </td>
+            <td>
+                <!-- Downloads -->
+                <a href="https://npmjs.org/package/@zk-kit/poseidon-proof">
+                    <img src="https://img.shields.io/npm/dm/@zk-kit/poseidon-proof.svg?style=flat-square" alt="Downloads" />
+                </a>
+            </td>
+            <td>
+                <!-- Size -->
+                <a href="https://bundlephobia.com/package/@zk-kit/poseidon-proof">
+                    <img src="https://img.shields.io/bundlephobia/minzip/@zk-kit/poseidon-proof" alt="npm bundle size (scoped)" />
+                </a>
+            </td>
+        </tr>
         <tr>
             <td>
                 <a href="https://github.com/privacy-scaling-explorations/zk-kit/tree/main/packages/groth16">

packages/groth16/package.json

@@ -25,7 +25,6 @@
         "url": "https://github.com/privacy-scaling-explorations/zk-kit.git/issues"
     },
     "scripts": {
-        "build:watch": "rollup -c rollup.config.ts -w --configPlugin typescript",
         "build": "rimraf dist && yarn build:browser && yarn build:node",
         "build:browser": "rollup -c rollup.browser.config.ts --configPlugin typescript",
         "build:node": "rollup -c rollup.node.config.ts --configPlugin typescript",

packages/poseidon-proof/.npmrc

@@ -0,0 +1 @@
+engine-strict=true

packages/poseidon-proof/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2023 Ethereum Foundation
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

packages/poseidon-proof/README.md

@@ -0,0 +1,155 @@
+<p align="center">
+    <h1 align="center">
+        Poseidon proof
+    </h1>
+    <p align="center">A library to generate and verify Poseidon proofs.</p>
+</p>
+
+<p align="center">
+    <a href="https://github.com/privacy-scaling-explorations/zk-kit">
+        <img src="https://img.shields.io/badge/project-zk--kit-blue.svg?style=flat-square">
+    </a>
+    <a href="https://github.com/privacy-scaling-explorations/zk-kit/tree/main/packages/poseidon-proof/LICENSE">
+        <img alt="NPM license" src="https://img.shields.io/npm/l/%40zk-kit%2Fposeidon-proof?style=flat-square">
+    </a>
+    <a href="https://www.npmjs.com/package/@zk-kit/poseidon-proof">
+        <img alt="NPM version" src="https://img.shields.io/npm/v/@zk-kit/poseidon-proof?style=flat-square" />
+    </a>
+    <a href="https://npmjs.org/package/@zk-kit/poseidon-proof">
+        <img alt="Downloads" src="https://img.shields.io/npm/dm/@zk-kit/poseidon-proof.svg?style=flat-square" />
+    </a>
+    <a href="https://bundlephobia.com/package/@zk-kit/poseidon-proof">
+        <img alt="npm bundle size (scoped)" src="https://img.shields.io/bundlephobia/minzip/@zk-kit/poseidon-proof" />
+    </a>
+    <a href="https://eslint.org/">
+        <img alt="Linter eslint" src="https://img.shields.io/badge/linter-eslint-8080f2?style=flat-square&logo=eslint" />
+    </a>
+    <a href="https://prettier.io/">
+        <img alt="Code style prettier" src="https://img.shields.io/badge/code%20style-prettier-f8bc45?style=flat-square&logo=prettier" />
+    </a>
+</p>
+
+<div align="center">
+    <h4>
+        <a href="https://appliedzkp.org/discord">
+            🗣️ Chat &amp; Support
+        </a>
+        <span>&nbsp;&nbsp;|&nbsp;&nbsp;</span>
+        <a href="https://zkkit.pse.dev/modules/_zk_kit_poseidon_proof.html">
+            📘 Docs
+        </a>
+    </h4>
+</div>
+
+| This zero-knowledge library facilitates the demonstration of having a Poseidon hash pre-image while keeping the pre-image value confidential. Additionally, it offers a mechanism to prevent the same proof from being reused. The circuit that forms the foundation of this library is accessible via this [link](https://github.com/privacy-scaling-explorations/zk-kit/blob/main/packages/circuits/templates/poseidon-proof.circom). |
+| --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+
+Originally developed for integration with [Semaphore V4](https://github.com/semaphore-protocol/semaphore), this library also functions effectively as a standalone tool. Notable use cases in connection with Semaphore can be:
+
+-   allowing a Semaphore user to prove that they possess the secret value associated with the identity commitment of their Semaphore identity,
+-   unmasking the identity of zero-knowledge proofs earlier created using Semaphore.
+
+The Snark artifacts (`.wasm` and `.zkey` files) can be specified or not in the `generate` function parameters and can possibly be downloaded using the following URLs:
+
+https://github.com/privacy-scaling-explorations/zk-kit/blob/ee457299d36d2601e5bf520237977a9f16b1b599/packages/poseidon-proof/src/config.ts#L5-L8
+
+> [!WARNING]  
+> The Snark artifacts currently used to generate zero-knowledge proofs are the result of an unsecure trusted setup, and the library has not yet been audited. Therefore, it is advised not to use it in production.
+
+## 🛠 Install
+
+### npm or yarn
+
+Install the `@zk-kit/poseidon-proof` package:
+
+```bash
+npm i @zk-kit/poseidon-proof
+```
+
+or yarn:
+
+```bash
+yarn add @zk-kit/poseidon-proof
+```
+
+## 📜 Usage
+
+\# **generate**(
+message: _BigNumberish_,
+scope: _BigNumberish_,
+snarkArtifacts?: _SnarkArtifacts_
+): Promise\<_PoseidonProof_>
+
+```typescript
+import { generate } from "@zk-kit/poseidon-proof"
+
+const scope = 1
+const message = 2
+
+const fullProof = await generate(message, scope)
+
+// If not specified, the Snark artifacts are downloaded automatically.
+// You can also specify them.
+const fullProof2 = await generate(message, scope, {
+    zkeyFilePath: "./poseidon-proof.zkey",
+    wasmFilePath: "./poseidon-proof.wasm"
+})
+
+console.log(fullProof)
+/*
+{
+    scope: '1',
+    hash: '8645981980787649023086883978738420856660271013038108762834452721572614684349',
+    nullifier: '7853200120776062878684798364095072458815029376092732009249414926327459813530',
+    proof: [
+        '8439157877715136449451128027974582198942685548176158240742469858289217640295',
+        '7742778415084033741154475792823260193410560424636243716622958831215275441500',
+        '19005176609208302398813682947612978224483117018101271134113308439452561466691',
+        '6209272538382784759793219866517186573065390524051102537220446165983489601194',
+        '12222537243697573476419214640884921904066033266502734603198915705889607365883',
+        '20066191345466355816238393590466176790809335456890624395337970890893401456064',
+        '4851746896803117511000878727783002155680855098198108089136166702412365578625',
+        '18391775232946751568173446051923718267369779168471637305003186214102154164036'
+    ]
+}
+*/
+```
+
+\# **verify**(poseidonProof: _PoseidonProof_): Promise\<_boolean_>
+
+```typescript
+import { verify } from "@zk-kit/poseidon-proof"
+
+const response = await verify(fullProof)
+
+console.log(response) // true or false
+
+// Eventually you may want to check the nullifier.
+```
+
+## 📈 Benchmarks
+
+Benchmarks were run on an Intel Core i7-1165G7, 16 GB RAM machine, after initializing the BN128 curve with [`@zk-kit/groth16`](https://github.com/privacy-scaling-explorations/zk-kit/edit/main/packages/groth16)-`buildBn128` (~230ms).
+
+| Generate proof | Verify proof | Constraints |
+| -------------- | ------------ | ----------- |
+| `80ms`         | `10ms`       | `141`       |
+
+```js
+import { generate, verify } from "@zk-kit/poseidon-proof"
+import { buildBn128 } from "@zk-kit/groth16"
+
+await buildBn128()
+
+console.time("generate")
+
+const proof = await generate(1, 2)
+
+console.timeEnd("generate")
+
+console.time("verify")
+
+console.log(await verify(proof))
+
+console.timeEnd("verify")
+```

packages/poseidon-proof/build.tsconfig.json

@@ -0,0 +1,9 @@
+{
+    "extends": "../../tsconfig.json",
+    "compilerOptions": {
+        "baseUrl": ".",
+        "declarationDir": "dist/types",
+        "resolveJsonModule": true
+    },
+    "include": ["src"]
+}

packages/poseidon-proof/package.json

@@ -0,0 +1,57 @@
+{
+    "name": "@zk-kit/poseidon-proof",
+    "version": "0.5.0",
+    "description": "A library to generate and verify Poseidon proofs.",
+    "license": "MIT",
+    "main": "dist/index.node.js",
+    "exports": {
+        "node": {
+            "import": "./dist/index.node.mjs",
+            "require": "./dist/index.node.js"
+        },
+        "browser": "./dist/index.browser.mjs",
+        "default": "./dist/index.browser.mjs"
+    },
+    "types": "dist/types/index.d.ts",
+    "files": [
+        "dist/",
+        "src/",
+        "LICENSE",
+        "README.md"
+    ],
+    "engines": {
+        "node": ">=18.0.0"
+    },
+    "repository": "[email protected]:privacy-scaling-explorations/zk-kit.git",
+    "homepage": "https://github.com/privacy-scaling-explorations/zk-kit/tree/main/packages/poseidon-proof",
+    "bugs": {
+        "url": "https://github.com/privacy-scaling-explorations/zk-kit.git/issues"
+    },
+    "scripts": {
+        "build": "rimraf dist && yarn build:browser && yarn build:node",
+        "build:browser": "rollup -c rollup.browser.config.ts --configPlugin typescript",
+        "build:node": "rollup -c rollup.node.config.ts --configPlugin typescript",
+        "prepublishOnly": "yarn build"
+    },
+    "publishConfig": {
+        "access": "public"
+    },
+    "devDependencies": {
+        "@rollup/plugin-alias": "^5.0.1",
+        "@rollup/plugin-json": "^5.0.1",
+        "@types/download": "^8.0.5",
+        "@types/tmp": "^0.2.6",
+        "poseidon-lite": "^0.2.0",
+        "rollup-plugin-cleanup": "^3.2.1",
+        "rollup-plugin-terser": "^7.0.2",
+        "rollup-plugin-typescript2": "^0.32.1"
+    },
+    "dependencies": {
+        "@ethersproject/bignumber": "^5.7.0",
+        "@ethersproject/bytes": "^5.7.0",
+        "@ethersproject/keccak256": "^5.7.0",
+        "@zk-kit/groth16": "0.4.0",
+        "download": "^8.0.0",
+        "tmp": "^0.2.1"
+    }
+}

packages/poseidon-proof/rollup.browser.config.ts

@@ -0,0 +1,38 @@
+import alias from "@rollup/plugin-alias"
+import json from "@rollup/plugin-json"
+import * as fs from "fs"
+import cleanup from "rollup-plugin-cleanup"
+import typescript from "rollup-plugin-typescript2"
+
+const pkg = JSON.parse(fs.readFileSync("./package.json", "utf-8"))
+const banner = `/**
+ * @module ${pkg.name}
+ * @version ${pkg.version}
+ * @file ${pkg.description}
+ * @copyright Ethereum Foundation 2023
+ * @license ${pkg.license}
+ * @see [Github]{@link ${pkg.homepage}}
+*/`
+
+export default {
+    input: "src/index.ts",
+    output: [
+        {
+            file: pkg.exports.browser,
+            format: "es",
+            banner
+        }
+    ],
+    external: Object.keys(pkg.dependencies),
+    plugins: [
+        alias({
+            entries: [{ find: "./get-snark-artifacts.node", replacement: "./get-snark-artifacts.browser" }]
+        }),
+        typescript({
+            tsconfig: "./build.tsconfig.json",
+            useTsconfigDeclarationDir: true
+        }),
+        cleanup({ comments: "jsdoc" }),
+        json()
+    ]
+}

packages/poseidon-proof/rollup.node.config.ts

@@ -0,0 +1,40 @@
+import json from "@rollup/plugin-json"
+import * as fs from "fs"
+import cleanup from "rollup-plugin-cleanup"
+import typescript from "rollup-plugin-typescript2"
+
+const pkg = JSON.parse(fs.readFileSync("./package.json", "utf-8"))
+const banner = `/**
+ * @module ${pkg.name}
+ * @version ${pkg.version}
+ * @file ${pkg.description}
+ * @copyright Ethereum Foundation 2023
+ * @license ${pkg.license}
+ * @see [Github]{@link ${pkg.homepage}}
+*/`
+
+export default {
+    input: "src/index.ts",
+    output: [
+        {
+            file: pkg.exports.node.require,
+            format: "cjs",
+            banner,
+            exports: "auto"
+        },
+        {
+            file: pkg.exports.node.import,
+            format: "es",
+            banner
+        }
+    ],
+    external: Object.keys(pkg.dependencies),
+    plugins: [
+        typescript({
+            tsconfig: "./build.tsconfig.json",
+            useTsconfigDeclarationDir: true
+        }),
+        cleanup({ comments: "jsdoc" }),
+        json()
+    ]
+}

packages/poseidon-proof/src/config.ts

@@ -0,0 +1,5 @@
+// eslint-disable-next-line import/prefer-default-export
+export const defaultSnarkArtifacts = {
+    wasmFilePath: "https://zkkit.cedoor.dev/poseidon-proof.wasm",
+    zkeyFilePath: "https://zkkit.cedoor.dev/poseidon-proof.zkey"
+}