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diff --git a/testing/mochitest/pywebsocket3/mod_pywebsocket/fast_masking.i b/testing/mochitest/pywebsocket3/mod_pywebsocket/fast_masking.i
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+// Copyright 2013, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+%module fast_masking
+
+%include "cstring.i"
+
+%{
+#include <cstring>
+
+#ifdef __SSE2__
+#include <emmintrin.h>
+#endif
+%}
+
+%apply (char *STRING, int LENGTH) {
+    (const char* payload, int payload_length),
+    (const char* masking_key, int masking_key_length) };
+%cstring_output_allocate_size(
+    char** result, int* result_length, delete [] *$1);
+
+%inline %{
+
+void mask(
+    const char* payload, int payload_length,
+    const char* masking_key, int masking_key_length,
+    int masking_key_index,
+    char** result, int* result_length) {
+  *result = new char[payload_length];
+  *result_length = payload_length;
+  memcpy(*result, payload, payload_length);
+
+  char* cursor = *result;
+  char* cursor_end = *result + *result_length;
+
+#ifdef __SSE2__
+  while ((cursor < cursor_end) &&
+         (reinterpret_cast<size_t>(cursor) & 0xf)) {
+    *cursor ^= masking_key[masking_key_index];
+    ++cursor;
+    masking_key_index = (masking_key_index + 1) % masking_key_length;
+  }
+  if (cursor == cursor_end) {
+    return;
+  }
+
+  const int kBlockSize = 16;
+  __m128i masking_key_block;
+  for (int i = 0; i < kBlockSize; ++i) {
+    *(reinterpret_cast<char*>(&masking_key_block) + i) =
+        masking_key[masking_key_index];
+    masking_key_index = (masking_key_index + 1) % masking_key_length;
+  }
+
+  while (cursor + kBlockSize <= cursor_end) {
+    __m128i payload_block =
+        _mm_load_si128(reinterpret_cast<__m128i*>(cursor));
+    _mm_stream_si128(reinterpret_cast<__m128i*>(cursor),
+                     _mm_xor_si128(payload_block, masking_key_block));
+    cursor += kBlockSize;
+  }
+#endif
+
+  while (cursor < cursor_end) {
+    *cursor ^= masking_key[masking_key_index];
+    ++cursor;
+    masking_key_index = (masking_key_index + 1) % masking_key_length;
+  }
+}
+
+%}