Add SHA hashes for packages (#1351)

utility/create-sha-file.js

@@ -0,0 +1,31 @@
+const fs = require("fs");
+const crypto = require("crypto");
+
+module.exports = async function (out, archiveFiles) {
+	let s = "";
+	for (const file of archiveFiles) {
+		s += `${file.base}\t${await hashFile(file.full)}\n`;
+	}
+	await fs.promises.writeFile(out, s);
+};
+
+function hashFile(path) {
+	return new Promise((resolve, reject) => {
+		let sum = crypto.createHash("sha256");
+
+		let fileStream = fs.createReadStream(path);
+		fileStream.on("error", err => {
+			return reject(err);
+		});
+		fileStream.on("data", chunk => {
+			try {
+				sum.update(chunk);
+			} catch (ex) {
+				return reject(ex);
+			}
+		});
+		fileStream.on("end", () => {
+			return resolve(sum.digest("hex"));
+		});
+	});
+}