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/**
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* \file avs_aes.c
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* \brief AES Avalon IP Core software driver
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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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* \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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#include <avs_aes.h>
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#include <avs_aes.h>
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#include <string.h>
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#include <string.h>
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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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context->key = (unsigned int*) KEY_ADDR;
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context->key = (unsigned int*) KEY_ADDR;
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context->payload= (unsigned int*) DATA_ADDR;
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context->payload= (unsigned int*) DATA_ADDR;
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context->result = (unsigned int*) RESULT_ADDR;
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context->result = (unsigned int*) RESULT_ADDR;
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context->control = (unsigned int*) AESCTRLWD;
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context->control = (unsigned int*) AESCTRLWD;
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*(context->control) = 0x00000000;
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*(context->control) = 0x00000000;
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}
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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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* \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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int i=0;
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int i=0;
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unsigned int* target_ptr = (unsigned int* )context->key;
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unsigned int* target_ptr = (unsigned int* )context->key;
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// Invalidate old key;
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// Invalidate old key;
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*(context->control) &= (~0x00000080);
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*(context->control) &= (~0x00000080);
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}
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}
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// validate key;
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// validate key;
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*(context->control) |= 0x00000080;
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*(context->control) |= 0x00000080;
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}
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}
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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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int i=0;
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int i=0;
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unsigned int* target_ptr = (unsigned int* )context->payload;
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unsigned int* target_ptr = (unsigned int* )context->payload;
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for(i=0; i<4; i++){
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for(i=0; i<4; i++){
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*(target_ptr++) = *(payload++);
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*(target_ptr++) = *(payload++);
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}
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}
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}
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}
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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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*(context->control) |= 0x00000080;
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*(context->control) |= 0x00000080;
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}
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}
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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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*(context->control) |= 0x00000001;
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*(context->control) |= 0x00000001;
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}
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}
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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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*(context->control) |= 0x00000002;
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*(context->control) |= 0x00000002;
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}
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}
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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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unsigned int mycontrol = *(context->control);
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unsigned int mycontrol = *(context->control);
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return mycontrol & 0x03;
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return mycontrol & 0x03;
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}
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}
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