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diff --git a/circuitpython/shared-bindings/aesio/__init__.c b/circuitpython/shared-bindings/aesio/__init__.c
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+++ b/circuitpython/shared-bindings/aesio/__init__.c
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+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <stdint.h>
+
+#include "py/obj.h"
+#include "py/runtime.h"
+
+#include "__init__.h"
+
+//| """AES encryption routines
+//|
+//| The `AES` module contains classes used to implement encryption
+//| and decryption. It aims to be low overhead in terms of memory."""
+
+
+STATIC const mp_obj_tuple_t mp_aes_key_size_obj = {
+    {&mp_type_tuple},
+    3,
+    {
+        MP_OBJ_NEW_SMALL_INT(16),
+        MP_OBJ_NEW_SMALL_INT(24),
+        MP_OBJ_NEW_SMALL_INT(32),
+    }
+};
+
+STATIC const mp_rom_map_elem_t aesio_module_globals_table[] = {
+    {MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_aesio)},
+    {MP_ROM_QSTR(MP_QSTR_AES), MP_ROM_PTR(&aesio_aes_type) },
+    {MP_ROM_QSTR(MP_QSTR_MODE_ECB), MP_ROM_INT(AES_MODE_ECB)},
+    {MP_ROM_QSTR(MP_QSTR_MODE_CBC), MP_ROM_INT(AES_MODE_CBC)},
+    {MP_ROM_QSTR(MP_QSTR_MODE_CTR), MP_ROM_INT(AES_MODE_CTR)},
+    {MP_ROM_QSTR(MP_QSTR_block_size), MP_ROM_INT(AES_BLOCKLEN)},
+    {MP_ROM_QSTR(MP_QSTR_key_size), (mp_obj_t)&mp_aes_key_size_obj},
+};
+
+STATIC MP_DEFINE_CONST_DICT(aesio_module_globals, aesio_module_globals_table);
+
+const mp_obj_module_t aesio_module = {
+    .base = {&mp_type_module},
+    .globals = (mp_obj_dict_t *)&aesio_module_globals,
+};
+
+MP_REGISTER_MODULE(MP_QSTR_aesio, aesio_module, CIRCUITPY_AESIO);