feat(groth16): create new groth16 package

packages/groth16/LICENSE

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+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/groth16/README.md

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+<p align="center">
+    <h1 align="center">
+        SnarkJS Groth16
+    </h1>
+    <p align="center">A snippet of SnarkJS code for verifying and generating Groth16 proofs only.</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/blob/main/LICENSE">
+        <img alt="Github license" src="https://img.shields.io/github/license/privacy-scaling-explorations/zk-kit.svg?style=flat-square">
+    </a>
+    <a href="https://www.npmjs.com/package/@zk-kit/groth16">
+        <img alt="NPM version" src="https://img.shields.io/npm/v/@zk-kit/groth16?style=flat-square" />
+    </a>
+    <a href="https://npmjs.org/package/@zk-kit/groth16">
+        <img alt="Downloads" src="https://img.shields.io/npm/dm/@zk-kit/groth16.svg?style=flat-square" />
+    </a>
+    <a href="https://bundlephobia.com/package/@zk-kit/groth16">
+        <img alt="npm bundle size (scoped)" src="https://img.shields.io/bundlephobia/minzip/@zk-kit/groth16" />
+    </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_groth16.html">
+            📘 Docs
+        </a>
+    </h4>
+</div>
+
+| This package contains [SnarkJS](https://github.com/iden3/snarkjs) functions for generating and verifying zero knowledge proofs with Groth16 specifically. In addition to the original code it also uses the cached `bn128` curve if it already exists, making verification and generation of consecutive proofs faster. |
+| ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+
+## 🛠 Install
+
+### npm or yarn
+
+Install the `@zk-kit/groth16` package and its peer dependencies with npm:
+
+```bash
+npm i @zk-kit/groth16
+```
+
+or yarn:
+
+```bash
+yarn add @zk-kit/groth16
+```
+
+## 📜 Usage
+
+\# **prove**(input: _CircuitSignals_, wasmFile: _ZKArtifact_, zkeyFile: _ZKArtifact_): Promise\<_{
+proof: Groth16Proof
+publicSignals: PublicSignals
+}_>
+
+```typescript
+import { prove } from "@zk-kit/groth16"
+
+const input = {
+    message: 12,
+    scope: 122
+}
+
+const proof = await prove(input, "./circuit.zkey", "./circuit.wasm")
+
+console.log(proof)
+/*
+{
+    proof: {
+        pi_a: [
+            '8259885706934172848141475422209230656096448508815982888010519325096632035723',
+            '3142099172052192611205205328157407975469005554072266974009053708782134081166',
+            '1'
+        ],
+        pi_b: [ [Array], [Array], [Array] ],
+        pi_c: [
+            '13863804425308906943736719856399634046638544298517159271373916818387594277305',
+            '21340646707244019956779928177502771923632450548108204371058275686712196195969',
+            '1'
+        ],
+        protocol: 'groth16',
+        curve: 'bn128'
+    },
+    publicSignals: [
+        '527758365153958423212195330785598453331596731388181860789801455413116800554',
+        '19104626566001952573667666924569656871967113105870778077087237826253896482830',
+        '122'
+    ]
+}
+*/
+```
+
+\# **verify**(verificationKey: _any_, proof: _{
+proof: Groth16Proof
+publicSignals: PublicSignals
+}_): Promise\<_boolean_>
+
+```typescript
+import { verify } from "@zk-kit/groth16"
+import verificationKey from "./circuit.json"
+
+const response = await verify(verificationKey, proof)
+
+console.log(response) // true
+```

packages/groth16/build.tsconfig.json

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+{
+    "extends": "../../tsconfig.json",
+    "compilerOptions": {
+        "baseUrl": ".",
+        "declarationDir": "dist/types"
+    },
+    "include": ["src"]
+}

packages/groth16/package.json

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+{
+    "name": "@zk-kit/groth16",
+    "version": "0.1.0",
+    "description": "A snippet of SnarkJS code for verifying and generating Groth16 proofs only.",
+    "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"
+    ],
+    "repository": "https://github.com/privacy-scaling-explorations/zk-kit",
+    "homepage": "https://github.com/privacy-scaling-explorations/zk-kit/tree/main/packages/groth16",
+    "bugs": {
+        "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",
+        "prepublishOnly": "yarn build"
+    },
+    "publishConfig": {
+        "access": "public"
+    },
+    "devDependencies": {
+        "@iden3/binfileutils": "0.0.11",
+        "@rollup/plugin-commonjs": "^24.1.0",
+        "@rollup/plugin-node-resolve": "^15.0.2",
+        "@rollup/plugin-virtual": "^3.0.2",
+        "fastfile": "0.0.20",
+        "rimraf": "^5.0.5",
+        "rollup": "^4.0.2",
+        "rollup-plugin-cleanup": "^3.2.1",
+        "rollup-plugin-typescript2": "^0.31.2"
+    },
+    "dependencies": {
+        "circom_runtime": "0.1.24",
+        "ffjavascript": "0.2.60"
+    }
+}

packages/groth16/rollup.browser.config.ts

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+import commonjs from "@rollup/plugin-commonjs"
+import { nodeResolve } from "@rollup/plugin-node-resolve"
+import virtual from "@rollup/plugin-virtual"
+import * as fs from "fs"
+import cleanup from "rollup-plugin-cleanup"
+import typescript from "rollup-plugin-typescript2"
+
+// Needed by fastfile.
+import { O_CREAT, O_EXCL, O_RDONLY, O_RDWR, O_TRUNC } from "constants"
+
+const constants = `
+export const O_TRUNC = ${O_TRUNC};
+export const O_CREAT = ${O_CREAT};
+export const O_RDWR = ${O_RDWR};
+export const O_EXCL = ${O_EXCL};
+export const O_RDONLY = ${O_RDONLY}
+`
+
+const empty = "export default {}"
+
+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: [
+        typescript({
+            tsconfig: "./build.tsconfig.json",
+            useTsconfigDeclarationDir: true
+        }),
+        virtual({
+            fs: empty,
+            constants
+        }),
+        nodeResolve(),
+        commonjs({
+            esmExternals: true
+        }),
+        cleanup({ comments: "jsdoc" })
+    ]
+}

packages/groth16/rollup.node.config.ts

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+import commonjs from "@rollup/plugin-commonjs"
+import { nodeResolve } from "@rollup/plugin-node-resolve"
+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
+        }),
+        nodeResolve(),
+        commonjs({
+            esmExternals: true
+        }),
+        cleanup({ comments: "jsdoc" })
+    ]
+}