diff --git a/lib/argon2_ffi_base.dart b/lib/argon2_ffi_base.dart
index 710348d..96b3d43 100644
--- a/lib/argon2_ffi_base.dart
+++ b/lib/argon2_ffi_base.dart
@@ -1,175 +1,5 @@
 library argon2_ffi_base;
 
-import 'dart:convert';
-import 'dart:ffi';
-import 'dart:io';
-import 'dart:typed_data';
-
-import 'package:ffi/ffi.dart';
-
-// ignore_for_file: non_constant_identifier_names,
-
-import 'package:logging/logging.dart';
-
-final _logger = Logger('argon2_ffi_base');
-
-typedef Argon2HashNative = Pointer<Utf8> Function(
-  Pointer<Uint8> key,
-  Uint32 keyLen,
-  Pointer<Uint8> salt,
-  Uint32 saltlen,
-  Uint32 m_cost, // memory cost
-  Uint32 t_cost, // time cost (number iterations)
-  Uint32 parallelism,
-  IntPtr hashlen,
-  Uint8 type,
-  Uint32 version,
-);
-
-typedef Argon2Hash = Pointer<Utf8> Function(
-  Pointer<Uint8> key,
-  int keyLen,
-  Pointer<Uint8> salt,
-  int saltlen,
-  int m_cost, // memory cost
-  int t_cost, // time cost (number iterations)
-  int parallelism,
-  int hashlen,
-  int type,
-  int version,
-);
-
-typedef ResolveLibrary = String Function(String baseName);
-
-class Argon2FfiFlutter extends Argon2Base {
-  Argon2FfiFlutter({this.resolveLibrary}) {
-    final argon2lib = _loadLib();
-    _nativeAdd = argon2lib
-        .lookup<NativeFunction<Int32 Function(Int32, Int32)>>('native_add')
-        .asFunction();
-    argon2hash = argon2lib
-        .lookup<NativeFunction<Argon2HashNative>>('hp_argon2_hash')
-        .asFunction();
-  }
-
-  static ResolveLibrary defaultResolveLibrary = (name) => name;
-
-  /// forces loading of dynamic library on MacOS instead of assuming
-  /// argon2 was statically linked. (ie. flutter usage, vs dart usage)
-  static bool resolveLibraryForceDynamic = false;
-
-  final ResolveLibrary resolveLibrary;
-
-  int Function(int x, int y) _nativeAdd;
-  @override
-  Argon2Hash argon2hash;
-
-  int addIt(int x, int y) => _nativeAdd(x, y);
-
-  DynamicLibrary _loadLib() {
-    final resolveLibrary = this.resolveLibrary ?? defaultResolveLibrary;
-
-    if (!resolveLibraryForceDynamic && (Platform.isIOS || Platform.isMacOS)) {
-      return DynamicLibrary.executable();
-    }
-    final libraryNames = [
-      [Platform.isAndroid, 'libargon2_ffi.so'],
-      [Platform.isLinux, './libargon2_ffi_plugin.so'],
-      [Platform.isWindows, 'argon2_ffi_plugin.dll'],
-      [Platform.isMacOS, 'libargon2_ffi.dylib'],
-      [Platform.isIOS, null], // only supports static linking.
-    ];
-    final libraryName = libraryNames.firstWhere((element) => element[0] == true,
-            orElse: () => throw StateError(
-                'Unsupported Operating System ${Platform.operatingSystem}'))[1]
-        as String;
-    final path = resolveLibrary(libraryName);
-    try {
-      return DynamicLibrary.open(libraryName);
-    } on ArgumentError catch (e, stackTrace) {
-      _logger.severe(
-          'Error while loading dynamic library from $path ($libraryName)',
-          e,
-          stackTrace);
-      rethrow;
-    }
-  }
-}
-
-abstract class Argon2 {
-  Uint8List argon2(Argon2Arguments args);
-
-  Future<Uint8List> argon2Async(Argon2Arguments args);
-}
-
-class Argon2Arguments {
-  Argon2Arguments(this.key, this.salt, this.memory, this.iterations,
-      this.length, this.parallelism, this.type, this.version);
-
-  final Uint8List key;
-  final Uint8List salt;
-  final int memory;
-  final int iterations;
-  final int length;
-  final int parallelism;
-  final int type;
-  final int version;
-}
-
-abstract class Argon2Base extends Argon2 {
-//  @protected
-  Argon2Hash get argon2hash;
-
-  @override
-  Uint8List argon2(Argon2Arguments args) {
-    final keyPtr = Uint8ArrayUtils.toPointer(args.key);
-    final saltPtr = Uint8ArrayUtils.toPointer(args.salt);
-//    final saltArray = allocate<Uint8>(count: args.salt.length);
-//    final saltList = saltArray.asTypedList(args.length);
-//    saltList.setAll(0, args.salt);
-//    const memoryCost = 1 << 16;
-
-//    _logger.fine('saltArray: ${ByteUtils.toHexList(saltArray.view)}');
-
-    final result = argon2hash(
-      keyPtr,
-      args.key.length,
-      saltPtr,
-      args.salt.length,
-      args.memory,
-      args.iterations,
-      args.parallelism,
-      args.length,
-      args.type,
-      args.version,
-    );
-
-    free(keyPtr);
-    free(saltPtr);
-//    free(saltArray);
-    final resultString = Utf8.fromUtf8(result);
-    return base64.decode(resultString);
-  }
-
-  @override
-  Future<Uint8List> argon2Async(Argon2Arguments args) async {
-    return argon2(args);
-  }
-}
-
-// from https://github.com/hanabi1224/flutter_native_extensions/blob/master/src/compression/dart_native_compression/lib/utils/uint8_list_utils.dart
-class Uint8ArrayUtils {
-  static Uint8List fromPointer(Pointer<Uint8> ptr, int length) {
-    final view = ptr.asTypedList(length);
-    final builder = BytesBuilder(copy: false);
-    builder.add(view);
-    return builder.takeBytes();
-  }
-
-  static Pointer<Uint8> toPointer(Uint8List bytes) {
-    final ptr = allocate<Uint8>(count: bytes.length);
-    final byteList = ptr.asTypedList(bytes.length);
-    byteList.setAll(0, bytes);
-    return ptr.cast();
-  }
-}
+export 'package:argon2_ffi_base/src/argon2_ffi_base.dart';
+export 'package:argon2_ffi_base/src/argon2_ffi_noop.dart'
+    if (dart.library.io) 'package:argon2_ffi_base/src/argon2_ffi_impl.dart';
diff --git a/lib/src/argon2_ffi_base.dart b/lib/src/argon2_ffi_base.dart
new file mode 100644
index 0000000..c78783f
--- /dev/null
+++ b/lib/src/argon2_ffi_base.dart
@@ -0,0 +1,21 @@
+import 'dart:typed_data';
+
+abstract class Argon2 {
+  Uint8List argon2(Argon2Arguments args);
+
+  Future<Uint8List> argon2Async(Argon2Arguments args);
+}
+
+class Argon2Arguments {
+  Argon2Arguments(this.key, this.salt, this.memory, this.iterations,
+      this.length, this.parallelism, this.type, this.version);
+
+  final Uint8List key;
+  final Uint8List salt;
+  final int memory;
+  final int iterations;
+  final int length;
+  final int parallelism;
+  final int type;
+  final int version;
+}
diff --git a/lib/src/argon2_ffi_impl.dart b/lib/src/argon2_ffi_impl.dart
new file mode 100644
index 0000000..fe77600
--- /dev/null
+++ b/lib/src/argon2_ffi_impl.dart
@@ -0,0 +1,137 @@
+import 'dart:convert';
+import 'dart:ffi';
+import 'dart:io';
+import 'dart:typed_data';
+
+import 'package:argon2_ffi_base/src/argon2_ffi_base.dart';
+import 'package:argon2_ffi_base/src/utils.dart';
+import 'package:ffi/ffi.dart';
+import 'package:logging/logging.dart';
+
+final _logger = Logger('argon2_ffi_base');
+
+// ignore_for_file: non_constant_identifier_names,
+
+typedef Argon2HashNative = Pointer<Utf8> Function(
+  Pointer<Uint8> key,
+  Uint32 keyLen,
+  Pointer<Uint8> salt,
+  Uint32 saltlen,
+  Uint32 m_cost, // memory cost
+  Uint32 t_cost, // time cost (number iterations)
+  Uint32 parallelism,
+  IntPtr hashlen,
+  Uint8 type,
+  Uint32 version,
+);
+
+typedef Argon2Hash = Pointer<Utf8> Function(
+  Pointer<Uint8> key,
+  int keyLen,
+  Pointer<Uint8> salt,
+  int saltlen,
+  int m_cost, // memory cost
+  int t_cost, // time cost (number iterations)
+  int parallelism,
+  int hashlen,
+  int type,
+  int version,
+);
+
+typedef ResolveLibrary = String Function(String baseName);
+
+abstract class Argon2Base extends Argon2 {
+//  @protected
+  Argon2Hash get argon2hash;
+
+  @override
+  Uint8List argon2(Argon2Arguments args) {
+    final keyPtr = Uint8ArrayUtils.toPointer(args.key);
+    final saltPtr = Uint8ArrayUtils.toPointer(args.salt);
+//    final saltArray = allocate<Uint8>(count: args.salt.length);
+//    final saltList = saltArray.asTypedList(args.length);
+//    saltList.setAll(0, args.salt);
+//    const memoryCost = 1 << 16;
+
+//    _logger.fine('saltArray: ${ByteUtils.toHexList(saltArray.view)}');
+
+    final result = argon2hash(
+      keyPtr,
+      args.key.length,
+      saltPtr,
+      args.salt.length,
+      args.memory,
+      args.iterations,
+      args.parallelism,
+      args.length,
+      args.type,
+      args.version,
+    );
+
+    free(keyPtr);
+    free(saltPtr);
+//    free(saltArray);
+    final resultString = Utf8.fromUtf8(result);
+    return base64.decode(resultString);
+  }
+
+  @override
+  Future<Uint8List> argon2Async(Argon2Arguments args) async {
+    return argon2(args);
+  }
+}
+
+class Argon2FfiFlutter extends Argon2Base {
+  Argon2FfiFlutter({this.resolveLibrary}) {
+    final argon2lib = _loadLib();
+    _nativeAdd = argon2lib
+        .lookup<NativeFunction<Int32 Function(Int32, Int32)>>('native_add')
+        .asFunction();
+    argon2hash = argon2lib
+        .lookup<NativeFunction<Argon2HashNative>>('hp_argon2_hash')
+        .asFunction();
+  }
+
+  static ResolveLibrary defaultResolveLibrary = (name) => name;
+
+  /// forces loading of dynamic library on MacOS instead of assuming
+  /// argon2 was statically linked. (ie. flutter usage, vs dart usage)
+  static bool resolveLibraryForceDynamic = false;
+
+  final ResolveLibrary resolveLibrary;
+
+  int Function(int x, int y) _nativeAdd;
+  @override
+  Argon2Hash argon2hash;
+
+  int addIt(int x, int y) => _nativeAdd(x, y);
+
+  DynamicLibrary _loadLib() {
+    final resolveLibrary = this.resolveLibrary ?? defaultResolveLibrary;
+
+    if (!resolveLibraryForceDynamic && (Platform.isIOS || Platform.isMacOS)) {
+      return DynamicLibrary.executable();
+    }
+    final libraryNames = [
+      [Platform.isAndroid, 'libargon2_ffi.so'],
+      [Platform.isLinux, './libargon2_ffi_plugin.so'],
+      [Platform.isWindows, 'argon2_ffi_plugin.dll'],
+      [Platform.isMacOS, 'libargon2_ffi.dylib'],
+      [Platform.isIOS, null], // only supports static linking.
+    ];
+    final libraryName = libraryNames.firstWhere((element) => element[0] == true,
+            orElse: () => throw StateError(
+                'Unsupported Operating System ${Platform.operatingSystem}'))[1]
+        as String;
+    final path = resolveLibrary(libraryName);
+    try {
+      return DynamicLibrary.open(libraryName);
+    } on ArgumentError catch (e, stackTrace) {
+      _logger.severe(
+          'Error while loading dynamic library from $path ($libraryName)',
+          e,
+          stackTrace);
+      rethrow;
+    }
+  }
+}
diff --git a/lib/src/argon2_ffi_noop.dart b/lib/src/argon2_ffi_noop.dart
new file mode 100644
index 0000000..556c268
--- /dev/null
+++ b/lib/src/argon2_ffi_noop.dart
@@ -0,0 +1,15 @@
+import 'dart:typed_data';
+
+import 'package:argon2_ffi_base/src/argon2_ffi_base.dart';
+
+class Argon2FfiFlutter extends Argon2 {
+  @override
+  Uint8List argon2(Argon2Arguments args) {
+    throw UnimplementedError();
+  }
+
+  @override
+  Future<Uint8List> argon2Async(Argon2Arguments args) {
+    throw UnimplementedError();
+  }
+}
diff --git a/lib/src/utils.dart b/lib/src/utils.dart
new file mode 100644
index 0000000..9f23908
--- /dev/null
+++ b/lib/src/utils.dart
@@ -0,0 +1,23 @@
+// from https://github.com/hanabi1224/flutter_native_extensions/blob/master/src/compression/dart_native_compression/lib/utils/uint8_list_utils.dart
+import 'dart:ffi';
+import 'dart:io';
+
+import 'dart:typed_data';
+
+import 'package:ffi/ffi.dart';
+
+class Uint8ArrayUtils {
+  static Uint8List fromPointer(Pointer<Uint8> ptr, int length) {
+    final view = ptr.asTypedList(length);
+    final builder = BytesBuilder(copy: false);
+    builder.add(view);
+    return builder.takeBytes();
+  }
+
+  static Pointer<Uint8> toPointer(Uint8List bytes) {
+    final ptr = allocate<Uint8>(count: bytes.length);
+    final byteList = ptr.asTypedList(bytes.length);
+    byteList.setAll(0, bytes);
+    return ptr.cast();
+  }
+}