feat(scripts): add MACI key generation script

.gitignore

@@ -154,3 +154,6 @@ packages/cli/contractAddresses.old.json
 packages/circuits/circom/test
 
 **/ts/__benchmarks__/results/**
+
+# MACI keys
+maci-keys/

package.json

@@ -26,7 +26,8 @@
     "test": "lerna run test --ignore maci-integrationtests --ignore maci-cli",
     "types": "lerna run types",
     "docs": "lerna run docs",
-    "prepare": "is-ci || husky"
+    "prepare": "is-ci || husky",
+    "generate-maci-keys": "ts-node scripts/generateMaciKeys.ts"
   },
   "author": "PSE",
   "devDependencies": {

scripts/generateMaciKeys.ts

@@ -0,0 +1,25 @@
+import { genKeypair } from "maci-crypto";
+
+import fs from "fs";
+import path from "path";
+
+async function generateMaciKeys(): Promise<void> {
+  const { privKey, pubKey } = genKeypair();
+
+  const keys = {
+    privateKey: privKey.toString(),
+    publicKey: pubKey.toString(),
+  };
+
+  const outputDir = path.resolve(__dirname, "..", "maci-keys");
+  try {
+    await fs.promises.access(outputDir);
+  } catch (error) {
+    await fs.promises.mkdir(outputDir, { recursive: true });
+  }
+
+  const outputFile = path.resolve(outputDir, "maci-keys.json");
+  await fs.promises.writeFile(outputFile, JSON.stringify(keys, null, 2));
+}
+
+generateMaciKeys();