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diff --git a/utility/encryption/aes_hardware.h b/utility/encryption/aes_hardware.h
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+/* ----------------------------------------------------------------------------
+ *         ATMEL Microcontroller Software Support 
+ * ----------------------------------------------------------------------------
+ * Copyright (c) 2008, Atmel Corporation
+ *
+ * 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 disclaimer below.
+ *
+ * Atmel's name may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * DISCLAIMED. IN NO EVENT SHALL ATMEL 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.
+ * ----------------------------------------------------------------------------
+ */
+
+//------------------------------------------------------------------------------
+/// \unit
+///
+/// !Purpose
+/// 
+/// Firmware encryption using AES hardware acceleration
+/// This code is based on the AES reference implementation published by Paulo
+/// Barreto and Vincent Rijmen.
+/// 
+/// !Usage
+/// 
+/// -# aes_hard_init: Initialize AES hardware 
+/// -# aes_hard_init_CBC: for the CBC mode
+/// -# aes_hard_init_CTR: for the CTR mode
+/// -# aes_hard_init_ECB: for the ECB mode
+/// -# aes_hard_cleanup: Cleans up AES
+/// -# aes_hard_decrypt: Decrypts a variable-length cipher text
+//------------------------------------------------------------------------------
+
+#ifndef BOOTLOADER_AES_HARDWARE_H
+#define BOOTLOADER_AES_HARDWARE_H
+
+//------------------------------------------------------------------------------
+// Includes
+//------------------------------------------------------------------------------
+#include "config.h"
+
+#if defined(USE_ENCRYPTION) && defined(ENCRYPTION_AES_HARD)
+
+//------------------------------------------------------------------------------
+// Check configuration
+//------------------------------------------------------------------------------
+#if (ENCRYPTION_KEY_LENGTH != 16) && (ENCRYPTION_KEY_LENGTH != 24) \
+ && (ENCRYPTION_KEY_LENGTH != 32)
+  #error Hardware AES acceleration only supports ENCRYPTION_KEY_LENGTH bits keys.
+#endif
+
+#if (ENCRYPTION_BLOCK_LENGTH !=  16)
+  #error Hardware AES acceleration only supports ENCRYPTION_KEY_LENGTH bits blocks.
+#endif
+
+#if !defined(ENCRYPTION_ECB) && \
+    !defined(ENCRYPTION_CBC) && \
+    !defined(ENCRYPTION_CTR)
+  #error Only ECB, CBC & CTR modes are supported.
+#endif
+
+//------------------------------------------------------------------------------
+// Definitions
+//------------------------------------------------------------------------------
+#ifdef ONLY_ONE_ENCRYPTION
+#define ENCRYPTION_INIT     aes_hard_init
+#define ENCRYPTION_CLEANUP  aes_hard_cleanup
+#define ENCRYPTION_DECRYPT  aes_hard_decrypt
+#endif
+
+//------------------------------------------------------------------------------
+//         Exported functions
+//------------------------------------------------------------------------------
+extern void aes_hard_init(void);
+#ifndef ONLY_ONE_ENCRYPTION
+extern void aes_hard_init_CBC(void);
+extern void aes_hard_init_CTR(void);
+extern void aes_hard_init_ECB(void);
+#endif
+extern void aes_hard_cleanup(void);
+extern int aes_hard_decrypt(const unsigned char *, unsigned char *, unsigned int);
+
+#endif // defined(USE_ENCRYPTION) && defined(ENCRYPTION_AES_HARD)
+#endif // BOOTLOADER_AES_HARDWARE_H
+
+