Add hash script

scripts/hashFile.js

@@ -0,0 +1,34 @@
+// copied from https://stackoverflow.com/a/60208623
+const path = require('path')
+const fs = require('fs')
+const crypto = require('crypto')
+
+const YOUR_FILE_PATH = './dist/OONI Probe Setup 3.9.7-rc.1.exe'
+
+function hashFile(file, algorithm = 'sha512', encoding = 'base64', options) {
+  return new Promise((resolve, reject) => {
+    const hash = crypto.createHash(algorithm)
+    hash.on('error', reject).setEncoding(encoding)
+    fs.createReadStream(
+      file,
+      Object.assign({}, options, {
+        highWaterMark: 1024 * 1024,
+        /* better to use more memory but hash faster */
+      })
+    )
+      .on('error', reject)
+      .on('end', () => {
+        hash.end()
+        console.log('hash done')
+        console.log(hash.read())
+        resolve(hash.read())
+      })
+      .pipe(hash, {
+        end: false,
+      })
+  })
+}
+
+const installerPath = path.resolve(__dirname, YOUR_FILE_PATH)
+
+hashFile(installerPath)