feat: generate key pair function

server/src/utils/crypto.ts

@@ -0,0 +1,20 @@
+import { generateKeyPairSync } from 'crypto'
+
+type KeyPair = {
+  privateKey: string
+  publicKey: string
+}
+
+export function generateKeyPair(): KeyPair {
+  const { privateKey, publicKey } = generateKeyPairSync('ed25519', {
+    publicKeyEncoding: {
+      type: 'spki',
+      format: 'pem',
+    },
+    privateKeyEncoding: {
+      type: 'pkcs8',
+      format: 'pem',
+    },
+  })
+  return { privateKey, publicKey }
+}