SamJakob · August 2, 2023 13:57 · Aug 2, 2023
diff --git a/rand.js b/rand.js
@@ -0,0 +1,24 @@
+const { promisify } = require('util');
+const exec = promisify(require('child_process').exec);
+
+/** Returns a random byte as a floating-point decimal between 0 and 1. */
+async function random() {
+	const payload = await exec(`gpg-connect-agent "SCD RANDOM 1" /bye`);
+	const randomBytes = payload.stdout.split('\n')[0].substr(2);
+
+	const buffer = Buffer.from(randomBytes, 'utf-8');
+	const number = buffer.readUIntBE(0, 1);
+	return number;
+}
+
+(async () => {
+	const lowerLimit = 1;
+	const upperLimit = parseInt(process.argv[2], 10);
+
+	let rand;
+	do {
+		rand = (await random()) + lowerLimit;
+	} while (rand > upperLimit);
+
+	console.log(rand);
+})();