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[/] [avs_aes/] [trunk/] [sw/] [avs_aes.c] - Blame information for rev 13

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1 11 ruschi 
/**
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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 <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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        context->key    = (unsigned int*) KEY_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->control        = (unsigned int*) AESCTRLWD;
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        *(context->control) = 0x00000000;
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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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        int i=0;
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        unsigned int* target_ptr = (unsigned int* )context->key;
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        // Invalidate old key;
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        *(context->control) &= (~0x00000080);
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        for(i=0; i<KEYWORDS; i++){
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                *(target_ptr++) = *(key++);
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        }
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        // validate key;
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        *(context->control) |= 0x00000080;
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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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        int i=0;
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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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                *(target_ptr++) = *(payload++);
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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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        *(context->control) |= 0x00000080;
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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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        *(context->control) |= 0x00000001;
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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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        *(context->control) |= 0x00000002;
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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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 */
125 5 ruschi 
int avs_aes_isBusy(avs_aes_handle* context){
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        unsigned int mycontrol = *(context->control);
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        return mycontrol & 0x03;
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}

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