diff --git a/app/src/main/java/com/topjohnwu/magisk/tasks/FlashZip.java b/app/src/main/java/com/topjohnwu/magisk/tasks/FlashZip.java
index 50803ec27..c7ffc74a9 100644
--- a/app/src/main/java/com/topjohnwu/magisk/tasks/FlashZip.java
+++ b/app/src/main/java/com/topjohnwu/magisk/tasks/FlashZip.java
@@ -5,7 +5,7 @@ import android.net.Uri;
 import com.topjohnwu.magisk.App;
 import com.topjohnwu.magisk.Const;
 import com.topjohnwu.magisk.utils.Utils;
-import com.topjohnwu.magisk.utils.ZipUtils;
+import com.topjohnwu.magisk.utils.ZipUtilsKt;
 import com.topjohnwu.superuser.Shell;
 import com.topjohnwu.superuser.ShellUtils;
 import com.topjohnwu.superuser.internal.UiThreadHandler;
@@ -34,7 +34,7 @@ public abstract class FlashZip {
     }
 
     private boolean unzipAndCheck() throws IOException {
-        ZipUtils.unzip(tmpFile, tmpFile.getParentFile(), "META-INF/com/google/android", true);
+        ZipUtilsKt.unzip(tmpFile, tmpFile.getParentFile(), "META-INF/com/google/android", true);
         return Shell.su("grep -q '#MAGISK' " + new File(tmpFile.getParentFile(), "updater-script"))
                 .exec().isSuccess();
     }
diff --git a/app/src/main/java/com/topjohnwu/magisk/utils/ZipUtils.java b/app/src/main/java/com/topjohnwu/magisk/utils/ZipUtils.java
deleted file mode 100644
index 42bfcbdd8..000000000
--- a/app/src/main/java/com/topjohnwu/magisk/utils/ZipUtils.java
+++ /dev/null
@@ -1,65 +0,0 @@
-package com.topjohnwu.magisk.utils;
-
-import com.topjohnwu.signing.JarMap;
-import com.topjohnwu.signing.SignAPK;
-import com.topjohnwu.superuser.ShellUtils;
-import com.topjohnwu.superuser.io.SuFile;
-import com.topjohnwu.superuser.io.SuFileOutputStream;
-
-import java.io.BufferedInputStream;
-import java.io.BufferedOutputStream;
-import java.io.File;
-import java.io.FileInputStream;
-import java.io.FileOutputStream;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.OutputStream;
-import java.util.zip.ZipEntry;
-import java.util.zip.ZipInputStream;
-
-public class ZipUtils {
-
-    public static void unzip(File zip, File folder, String path, boolean junkPath) throws IOException {
-        InputStream in = new BufferedInputStream(new FileInputStream(zip));
-        unzip(in, folder, path, junkPath);
-        in.close();
-    }
-
-    public static void unzip(InputStream zip, File folder, String path, boolean junkPath) throws IOException {
-        try {
-            ZipInputStream zipfile = new ZipInputStream(zip);
-            ZipEntry entry;
-            while ((entry = zipfile.getNextEntry()) != null) {
-                if (!entry.getName().startsWith(path) || entry.isDirectory()){
-                    // Ignore directories, only create files
-                    continue;
-                }
-                String name;
-                if (junkPath) {
-                    name = entry.getName().substring(entry.getName().lastIndexOf('/') + 1);
-                } else {
-                    name = entry.getName();
-                }
-                File dest = new File(folder, name);
-                if (!dest.getParentFile().exists() && !dest.getParentFile().mkdirs()) {
-                    dest = new SuFile(folder, name);
-                    dest.getParentFile().mkdirs();
-                }
-                try (OutputStream out = new SuFileOutputStream(dest)) {
-                    ShellUtils.pump(zipfile, out);
-                }
-            }
-        }
-        catch(IOException e) {
-            e.printStackTrace();
-            throw e;
-        }
-    }
-
-    public static void signZip(File input, File output) throws Exception {
-        try (JarMap map = new JarMap(input, false);
-             BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(output))) {
-            SignAPK.sign(map, out);
-        }
-    }
-}
diff --git a/app/src/main/java/com/topjohnwu/magisk/utils/ZipUtils.kt b/app/src/main/java/com/topjohnwu/magisk/utils/ZipUtils.kt
new file mode 100644
index 000000000..956bf2184
--- /dev/null
+++ b/app/src/main/java/com/topjohnwu/magisk/utils/ZipUtils.kt
@@ -0,0 +1,46 @@
+package com.topjohnwu.magisk.utils
+
+import com.topjohnwu.superuser.io.SuFile
+import com.topjohnwu.superuser.io.SuFileOutputStream
+import java.io.File
+import java.io.IOException
+import java.io.InputStream
+import java.util.zip.ZipEntry
+import java.util.zip.ZipInputStream
+
+@Throws(IOException::class)
+@JvmOverloads
+fun unzip(zip: File, folder: File, path: String = "", junkPath: Boolean = false) {
+    zip.inputStream().buffered().use {
+        unzip(it, folder, path, junkPath)
+    }
+}
+
+@Throws(IOException::class)
+fun unzip(zip: InputStream, folder: File, path: String, junkPath: Boolean) {
+    try {
+        val zin = ZipInputStream(zip)
+        var entry: ZipEntry
+        while (true) {
+            entry = zin.nextEntry ?: break
+            if (!entry.name.startsWith(path) || entry.isDirectory) {
+                // Ignore directories, only create files
+                continue
+            }
+            val name = if (junkPath)
+                entry.name.substring(entry.name.lastIndexOf('/') + 1)
+            else
+                entry.name
+
+            var dest = File(folder, name)
+            if (!dest.parentFile!!.exists() && !dest.parentFile!!.mkdirs()) {
+                dest = SuFile(folder, name)
+                dest.parentFile!!.mkdirs()
+            }
+            SuFileOutputStream(dest).use { out -> zin.copyTo(out) }
+        }
+    } catch (e: IOException) {
+        e.printStackTrace()
+        throw e
+    }
+}