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diff --git a/utility/encryption/encryption.h b/utility/encryption/encryption.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
+/// 
+/// !Usage
+///
+/// This file must include the header of every encryption module implemented for
+/// the bootloader. It is also responsible for defining mock functions if no
+/// encryption module is selected, as well as checking that parameters are
+/// correctly set.
+//
+/// An encryption module must define the following functions:
+/// -# void encryption_init(void);
+/// -# void encryption_cleanup(void);
+/// -# int encryption_decrypt(const unsigned char *, unsigned char *, unsigned int)
+//------------------------------------------------------------------------------
+
+#ifndef BOOTLOADER_ENCRYPTION_H
+#define BOOTLOADER_ENCRYPTION_H
+
+//------------------------------------------------------------------------------
+// Includes
+//------------------------------------------------------------------------------
+#include "config.h"
+
+
+//------------------------------------------------------------------------------
+// Check configuration
+//------------------------------------------------------------------------------
+#ifdef ONLY_ONE_ENCRYPTION
+#if !defined(ENCRYPTION_INIT) && !defined(USE_ENCRYPTION)
+  #define ENCRYPTION_INIT();
+  #define ENCRYPTION_CLEANUP();
+  #define ENCRYPTION_DECRYPT(...) 1
+
+#elif !defined(ENCRYPTION_INIT) && defined(USE_ENCRYPTION)
+  #error USE_ENCRYPTION defined but no encryption method selected.
+
+#elif !defined(ENCRYPTION_AES_LTC) && \
+      !defined(ENCRYPTION_AES_REF) && \
+      !defined(ENCRYPTION_AES_HARD) && \
+      !defined(ENCRYPTION_3DES_LTC) && \
+      !defined(ENCRYPTION_3DES_HARD)
+  #error No algorithm selected.
+
+#elif !defined(ENCRYPTION_ECB) && \
+      !defined(ENCRYPTION_CBC) && \
+      !defined(ENCRYPTION_CTR)
+  #error No encryption mode selected.
+
+#elif !defined(ENCRYPTION_KEY)
+  #error No key defined.
+
+#elif !defined(ENCRYPTION_KEY_LENGTH)
+  #error No key length selected.
+
+#elif !defined(ENCRYPTION_IV)
+  #error No initialization vector defined.
+
+#elif !defined(ENCRYPTION_BLOCK_LENGTH)
+  #error No block length selected.
+
+#endif
+#endif // ONLY_ONE_ENCRYPTION
+#endif // BOOTLOADER_ENCRYPTION_H
+