diff --git a/plugins/signed-integrity/cli.js b/plugins/signed-integrity/cli.js
index d0063a3..8b4991e 100644
--- a/plugins/signed-integrity/cli.js
+++ b/plugins/signed-integrity/cli.js
@@ -117,32 +117,28 @@ let getFileIntegrity = async (path, algos) => {
     
     // are we working with a file?
     if (fileInfo.isFile) {
-        
-        // initialize
-        content = new Uint8Array()
-        var buf = new Uint8Array(1000);
-        
-        // read the first batch
-        var numread = file.readSync(buf);
-        
-        // read the rest, if there is anything to read
-        while (numread !== null) {
-            //console.log(`    +-- read: ${numread}`)
-            //console.log(`        +-- length: ${content.length}`)
-            
-            // there has to be a better way...
-            var new_content = new Uint8Array(content.length + numread);
-            //console.log(`        +-- new length: ${new_content.length}`)
-            new_content.set(content)
-            if (buf.length === numread) {
-                new_content.set(buf, content.length)
-            } else {
-                new_content.set(buf.slice(0, numread), content.length)
+        const reader = file.readable.getReader();
+        const chunks = [];
+
+        while (true) {
+            const { done, value } = await reader.read();
+            if (done) {
+                break;
             }
-            content = new_content
-            
-            // read some more
-            numread = file.readSync(buf);
+            chunks.push(value);
+        }
+
+        let length = 0;
+        for (const chunk of chunks) {
+            length += chunk.length;
+        }
+
+        content = new Uint8Array(length);
+
+        let index = 0;
+        for (const chunk of chunks) {
+            content.set(chunk, index);
+            index += chunk.length;
         }
     }