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/**
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* \file avs_aes.h
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* \brief header file for AES Avalon IP Core software driver
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* offers interfaces to convinient access to the core
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*
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* This file is part of the project avs_aes
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* see: http://opencores.org/project,avs_aes
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*
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*
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* \section AUTHORS
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* Thomas Ruschival -- ruschi@opencores.org (www.ruschival.de)
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*
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* \section LICENSE
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* Copyright (c) 2009, Authors and opencores.org
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* * Neither the name of the organization nor the names of its contributors
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* may be used to endorse or promote products derived from this software without
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* specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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* OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE
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*/
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#ifndef AVS_AES_H_
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#ifndef AVS_AES_H_
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#define AVS_AES_H_
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#define AVS_AES_H_
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/**
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* \section Configuration
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* Configuration items for the Avalon Slave component
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* change them or define them elsewhere
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*/
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#ifndef KEYWORDS
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/**
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* Keylength 256 Bit AES
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*/
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#define KEYWORDS 8
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#define KEYWORDS 8
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#endif /* KEYWORDS */
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#ifndef AES_BASEADDR
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/**
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* base address of the Avalon Slave component in memory map
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*/
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#define AES_BASEADDR 0x40000
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#define AES_BASEADDR 0x40000
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#endif /* AES_BASEADDR */
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/**
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* \section Constants
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* Constants no need to change them!
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*/
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/** memory offset for key DON'T CHANGE! */
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#define KEY_ADDR AES_BASEADDR+0x00
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#define KEY_ADDR AES_BASEADDR+0x00
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/** memory offset of payload DON'T CHANGE!*/
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#define DATA_ADDR AES_BASEADDR+0x08
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#define DATA_ADDR AES_BASEADDR+0x08
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/** memory offset of result DON'T CHANGE! */
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#define RESULT_ADDR AES_BASEADDR+0x10
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#define RESULT_ADDR AES_BASEADDR+0x10
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/** memory offset for control word DON'T CHANGE! */
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#define AESCTRLWD AES_BASEADDR+0x18
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#define AESCTRLWD AES_BASEADDR+0x18
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/**
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* \brief object storing addresses for this Avalon AES slave
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* might be useful in case there are more attached, also for convinience
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*/
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typedef struct{
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typedef struct{
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/**
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* \brief pointer "KEY" field in memory mapping
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*/
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volatile unsigned int* key;
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volatile unsigned int* key;
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/**
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* \brief pointer "data" field in memory mapping
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* used for both decryption and encryption
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*/
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volatile unsigned int* payload;
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volatile unsigned int* payload;
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/**
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* \brief pointer "RESULT" field in memory mapping
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*/
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volatile unsigned int* result;
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volatile unsigned int* result;
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/**
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* \brief pointer to control word
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*/
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volatile unsigned int* control;
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volatile unsigned int* control;
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} avs_aes_handle;
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} avs_aes_handle;
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/**
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* \section functions
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**/
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/**
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* \brief setup the context to be used later.
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* initializes the pointers to the correct memory locations
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* \param context : struct grouping address information
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*/
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void avs_aes_init(avs_aes_handle* context);
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void avs_aes_init(avs_aes_handle* context);
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/**
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* \brief setup the context to be used later.
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* initializes the pointers to the correct memory locations
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* \param context struct grouping address information
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* \param key user key to load
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*/
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void avs_aes_setKey(avs_aes_handle* context, unsigned int* key);
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void avs_aes_setKey(avs_aes_handle* context, unsigned int* key);
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/**
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* \brief loads payload for processing to the core
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* basically memcopy...
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* \param context struct grouping address information
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* \param payload user data to be processed
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*/
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void avs_aes_setPayload(avs_aes_handle* context, unsigned int* payload);
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void avs_aes_setPayload(avs_aes_handle* context, unsigned int* payload);
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/**
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* \brief set the KEY_VALID flag in the control word
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* used to signal the completion of writing the key ( \ref avs_aes_setKey )
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* \param context struct grouping address information
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*/
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void avs_aes_setKeyvalid(avs_aes_handle* context);
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void avs_aes_setKeyvalid(avs_aes_handle* context);
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/**
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* \brief set the ENCRYPT flag in the control word
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* start encryption of (hopefully) previously loaded payload
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* \param context struct grouping address information
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*/
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void avs_aes_encrypt(avs_aes_handle* context);
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void avs_aes_encrypt(avs_aes_handle* context);
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/**
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* \brief set the DECRYPT flag in the control word
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* start encryption of (hopefully) previously loaded payload
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* \param context struct grouping address information
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*/
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void avs_aes_decrypt( avs_aes_handle* context);
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void avs_aes_decrypt( avs_aes_handle* context);
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/**
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* \brief checks the COMPLETED flag
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* can be used for ugly polling the slave if IRQs are not used
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* \param context struct grouping address information
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* \return 1 if still computing 0 if done.
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*/
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int avs_aes_isBusy(avs_aes_handle* context);
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int avs_aes_isBusy(avs_aes_handle* context);
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#endif /*AVS_AES_H_*/
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#endif /*AVS_AES_H_*/
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