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<h1>avs_aes.c</h1><a href="avs__aes_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/**</span>
<a name="l00002"></a>00002 <span class="comment">* \file avs_aes.c</span>
<a name="l00003"></a>00003 <span class="comment">* \brief AES Avalon IP Core software driver </span>
<a name="l00004"></a>00004 <span class="comment">*</span>
<a name="l00005"></a>00005 <span class="comment">* This file is part of the project avs_aes</span>
<a name="l00006"></a>00006 <span class="comment">* see: http://opencores.org/project,avs_aes</span>
<a name="l00007"></a>00007 <span class="comment">* </span>
<a name="l00008"></a>00008 <span class="comment">* \section AUTHORS</span>
<a name="l00009"></a>00009 <span class="comment">* Thomas Ruschival -- ruschi@opencores.org (www.ruschival.de)</span>
<a name="l00010"></a>00010 <span class="comment">* </span>
<a name="l00011"></a>00011 <span class="comment">* \section LICENSE</span>
<a name="l00012"></a>00012 <span class="comment">* Copyright (c) 2009, Authors and opencores.org</span>
<a name="l00013"></a>00013 <span class="comment">* All rights reserved.</span>
<a name="l00014"></a>00014 <span class="comment">* </span>
<a name="l00015"></a>00015 <span class="comment">* Redistribution and use in source and binary forms, with or without modification,</span>
<a name="l00016"></a>00016 <span class="comment">* are permitted provided that the following conditions are met:</span>
<a name="l00017"></a>00017 <span class="comment">* * Redistributions of source code must retain the above copyright notice,</span>
<a name="l00018"></a>00018 <span class="comment">* this list of conditions and the following disclaimer.</span>
<a name="l00019"></a>00019 <span class="comment">* * Redistributions in binary form must reproduce the above copyright notice,</span>
<a name="l00020"></a>00020 <span class="comment">* this list of conditions and the following disclaimer in the documentation</span>
<a name="l00021"></a>00021 <span class="comment">* and/or other materials provided with the distribution.</span>
<a name="l00022"></a>00022 <span class="comment">* * Neither the name of the organization nor the names of its contributors</span>
<a name="l00023"></a>00023 <span class="comment">* may be used to endorse or promote products derived from this software without</span>
<a name="l00024"></a>00024 <span class="comment">* specific prior written permission.</span>
<a name="l00025"></a>00025 <span class="comment">* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"</span>
<a name="l00026"></a>00026 <span class="comment">* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE</span>
<a name="l00027"></a>00027 <span class="comment">* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE</span>
<a name="l00028"></a>00028 <span class="comment">* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE</span>
<a name="l00029"></a>00029 <span class="comment">* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,</span>
<a name="l00030"></a>00030 <span class="comment">* OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF</span>
<a name="l00031"></a>00031 <span class="comment">* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS</span>
<a name="l00032"></a>00032 <span class="comment">* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN</span>
<a name="l00033"></a>00033 <span class="comment">* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)</span>
<a name="l00034"></a>00034 <span class="comment">* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF</span>
<a name="l00035"></a>00035 <span class="comment">* THE POSSIBILITY OF SUCH DAMAGE </span>
<a name="l00036"></a>00036 <span class="comment">*/</span>
<a name="l00037"></a>00037
<a name="l00038"></a>00038
<a name="l00039"></a>00039 <span class="preprocessor">#include <<a class="code" href="avs__aes_8h.html" title="header file for AES Avalon IP Core software driver offers interfaces to convinient...">avs_aes.h</a>></span>
<a name="l00040"></a>00040 <span class="preprocessor">#include <string.h></span>
<a name="l00041"></a>00041 <span class="comment"></span>
<a name="l00042"></a>00042 <span class="comment">/**</span>
<a name="l00043"></a>00043 <span class="comment"> * \brief setup the context to be used later.</span>
<a name="l00044"></a>00044 <span class="comment"> * initializes the pointers to the correct memory locations</span>
<a name="l00045"></a>00045 <span class="comment"> * \param context : struct grouping address information </span>
<a name="l00046"></a>00046 <span class="comment"> */</span>
<a name="l00047"></a><a class="code" href="avs__aes_8h.html#a962dd946798faab0e83d401c7d43c33c">00047</a> <span class="keywordtype">void</span> <a class="code" href="avs__aes_8c.html#a962dd946798faab0e83d401c7d43c33c" title="setup the context to be used later.">avs_aes_init</a>(<a class="code" href="structavs__aes__handle.html" title="object storing addresses for this Avalon AES slave might be useful in case there...">avs_aes_handle</a>* context){
<a name="l00048"></a>00048 context-><a class="code" href="structavs__aes__handle.html#acb9eb474c8310afe4b082b79914f274c" title="pointer &quot;KEY&quot; field in memory mapping">key</a> = (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>*) <a class="code" href="avs__aes_8h.html#ac237029d30090de9c406fd8cf6f9df37" title="memory offset for key DON&#39;T CHANGE!">KEY_ADDR</a>;
<a name="l00049"></a>00049 context-><a class="code" href="structavs__aes__handle.html#adae23dc33b7dec54b9da34f347256214" title="pointer &quot;data&quot; field in memory mapping used for both decryption and encryption...">payload</a>= (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>*) <a class="code" href="avs__aes_8h.html#a622ef33a8b85e8a7558ce42e9fc73870" title="memory offset of payload DON&#39;T CHANGE!">DATA_ADDR</a>;
<a name="l00050"></a>00050 context-><a class="code" href="structavs__aes__handle.html#ae0ad9e7bde68d07c018a299a0cda66af" title="pointer &quot;RESULT&quot; field in memory mapping">result</a> = (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>*) <a class="code" href="avs__aes_8h.html#add31e6954a8ef1d40c63409f686135b9" title="memory offset of result DON&#39;T CHANGE!">RESULT_ADDR</a>;
<a name="l00051"></a>00051 context-><a class="code" href="structavs__aes__handle.html#a15143869a0c8bfcacc8e1839e4e789c9" title="pointer to control word">control</a> = (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>*) <a class="code" href="avs__aes_8h.html#a939a4e25c6ce6c1224b8d923038f6639" title="memory offset for control word DON&#39;T CHANGE!">AESCTRLWD</a>;
<a name="l00052"></a>00052 *(context-><a class="code" href="structavs__aes__handle.html#a15143869a0c8bfcacc8e1839e4e789c9" title="pointer to control word">control</a>) = 0x00000000;
<a name="l00053"></a>00053 }
<a name="l00054"></a>00054
<a name="l00055"></a>00055 <span class="comment"></span>
<a name="l00056"></a>00056 <span class="comment">/**</span>
<a name="l00057"></a>00057 <span class="comment"> * \brief setup the context to be used later.</span>
<a name="l00058"></a>00058 <span class="comment"> * initializes the pointers to the correct memory locations</span>
<a name="l00059"></a>00059 <span class="comment"> * \param context struct grouping address information </span>
<a name="l00060"></a>00060 <span class="comment"> * \param key user key to load</span>
<a name="l00061"></a>00061 <span class="comment"> */</span>
<a name="l00062"></a><a class="code" href="avs__aes_8h.html#af18edc2beecc3842a131423f55c7636a">00062</a> <span class="keywordtype">void</span> <a class="code" href="avs__aes_8c.html#af18edc2beecc3842a131423f55c7636a" title="setup the context to be used later.">avs_aes_setKey</a>(<a class="code" href="structavs__aes__handle.html" title="object storing addresses for this Avalon AES slave might be useful in case there...">avs_aes_handle</a>* context, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>* key){
<a name="l00063"></a>00063 <span class="keywordtype">int</span> i=0;
<a name="l00064"></a>00064 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>* target_ptr = (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>* )context-><a class="code" href="structavs__aes__handle.html#acb9eb474c8310afe4b082b79914f274c" title="pointer &quot;KEY&quot; field in memory mapping">key</a>;
<a name="l00065"></a>00065 <span class="comment">// Invalidate old key;</span>
<a name="l00066"></a>00066 *(context-><a class="code" href="structavs__aes__handle.html#a15143869a0c8bfcacc8e1839e4e789c9" title="pointer to control word">control</a>) &= (~0x00000080);
<a name="l00067"></a>00067 <span class="keywordflow">for</span>(i=0; i<<a class="code" href="avs__aes_8h.html#a40ac9fbe108b0ea74f57215528f13196" title="Keylength 256 Bit AES.">KEYWORDS</a>; i++){
<a name="l00068"></a>00068 *(target_ptr++) = *(key++);
<a name="l00069"></a>00069 }
<a name="l00070"></a>00070 <span class="comment">// validate key;</span>
<a name="l00071"></a>00071 *(context-><a class="code" href="structavs__aes__handle.html#a15143869a0c8bfcacc8e1839e4e789c9" title="pointer to control word">control</a>) |= 0x00000080;
<a name="l00072"></a>00072 }
<a name="l00073"></a>00073
<a name="l00074"></a>00074 <span class="comment"></span>
<a name="l00075"></a>00075 <span class="comment">/**</span>
<a name="l00076"></a>00076 <span class="comment"> * \brief loads payload for processing to the core</span>
<a name="l00077"></a>00077 <span class="comment"> * basically memcopy...</span>
<a name="l00078"></a>00078 <span class="comment"> * \param context struct grouping address information </span>
<a name="l00079"></a>00079 <span class="comment"> * \param payload user data to be processed</span>
<a name="l00080"></a>00080 <span class="comment"> */</span>
<a name="l00081"></a><a class="code" href="avs__aes_8h.html#a22f9afae76f645e31b514b5aa4df2cc1">00081</a> <span class="keywordtype">void</span> <a class="code" href="avs__aes_8c.html#a22f9afae76f645e31b514b5aa4df2cc1" title="loads payload for processing to the core basically memcopy.">avs_aes_setPayload</a>(<a class="code" href="structavs__aes__handle.html" title="object storing addresses for this Avalon AES slave might be useful in case there...">avs_aes_handle</a>* context, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>* payload){
<a name="l00082"></a>00082 <span class="keywordtype">int</span> i=0;
<a name="l00083"></a>00083 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>* target_ptr = (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>* )context-><a class="code" href="structavs__aes__handle.html#adae23dc33b7dec54b9da34f347256214" title="pointer &quot;data&quot; field in memory mapping used for both decryption and encryption...">payload</a>;
<a name="l00084"></a>00084 <span class="keywordflow">for</span>(i=0; i<4; i++){
<a name="l00085"></a>00085 *(target_ptr++) = *(payload++);
<a name="l00086"></a>00086 }
<a name="l00087"></a>00087 }
<a name="l00088"></a>00088
<a name="l00089"></a>00089
<a name="l00090"></a>00090 <span class="comment"></span>
<a name="l00091"></a>00091 <span class="comment">/**</span>
<a name="l00092"></a>00092 <span class="comment"> * \brief set the KEY_VALID flag in the control word</span>
<a name="l00093"></a>00093 <span class="comment"> * used to signal the completion of writing the key ( \ref avs_aes_setKey )</span>
<a name="l00094"></a>00094 <span class="comment"> * \param context struct grouping address information </span>
<a name="l00095"></a>00095 <span class="comment"> */</span>
<a name="l00096"></a><a class="code" href="avs__aes_8h.html#a55f078baaf019797ab6de7ea1a02475f">00096</a> <span class="keywordtype">void</span> <a class="code" href="avs__aes_8c.html#a55f078baaf019797ab6de7ea1a02475f" title="set the KEY_VALID flag in the control word used to signal the completion of writing...">avs_aes_setKeyvalid</a>(<a class="code" href="structavs__aes__handle.html" title="object storing addresses for this Avalon AES slave might be useful in case there...">avs_aes_handle</a>* context){
<a name="l00097"></a>00097 *(context-><a class="code" href="structavs__aes__handle.html#a15143869a0c8bfcacc8e1839e4e789c9" title="pointer to control word">control</a>) |= 0x00000080;
<a name="l00098"></a>00098 }
<a name="l00099"></a>00099
<a name="l00100"></a>00100 <span class="comment"></span>
<a name="l00101"></a>00101 <span class="comment">/**</span>
<a name="l00102"></a>00102 <span class="comment"> * \brief set the ENCRYPT flag in the control word</span>
<a name="l00103"></a>00103 <span class="comment"> * start encryption of (hopefully) previously loaded payload </span>
<a name="l00104"></a>00104 <span class="comment"> * \param context struct grouping address information </span>
<a name="l00105"></a>00105 <span class="comment"> */</span>
<a name="l00106"></a><a class="code" href="avs__aes_8h.html#acea23b2ab998f18b9aca810765632cac">00106</a> <span class="keywordtype">void</span> <a class="code" href="avs__aes_8c.html#acea23b2ab998f18b9aca810765632cac" title="set the ENCRYPT flag in the control word start encryption of (hopefully) previously...">avs_aes_encrypt</a>(<a class="code" href="structavs__aes__handle.html" title="object storing addresses for this Avalon AES slave might be useful in case there...">avs_aes_handle</a>* context){
<a name="l00107"></a>00107 *(context-><a class="code" href="structavs__aes__handle.html#a15143869a0c8bfcacc8e1839e4e789c9" title="pointer to control word">control</a>) |= 0x00000001;
<a name="l00108"></a>00108 }
<a name="l00109"></a>00109 <span class="comment"></span>
<a name="l00110"></a>00110 <span class="comment">/**</span>
<a name="l00111"></a>00111 <span class="comment"> * \brief set the DECRYPT flag in the control word</span>
<a name="l00112"></a>00112 <span class="comment"> * start encryption of (hopefully) previously loaded payload </span>
<a name="l00113"></a>00113 <span class="comment"> * \param context struct grouping address information </span>
<a name="l00114"></a>00114 <span class="comment"> */</span>
<a name="l00115"></a><a class="code" href="avs__aes_8h.html#aef16b7ecbb1b091934a9c670ce3b2fcf">00115</a> <span class="keywordtype">void</span> <a class="code" href="avs__aes_8c.html#aef16b7ecbb1b091934a9c670ce3b2fcf" title="set the DECRYPT flag in the control word start encryption of (hopefully) previously...">avs_aes_decrypt</a>(<a class="code" href="structavs__aes__handle.html" title="object storing addresses for this Avalon AES slave might be useful in case there...">avs_aes_handle</a>* context){
<a name="l00116"></a>00116 *(context-><a class="code" href="structavs__aes__handle.html#a15143869a0c8bfcacc8e1839e4e789c9" title="pointer to control word">control</a>) |= 0x00000002;
<a name="l00117"></a>00117 }
<a name="l00118"></a>00118 <span class="comment"></span>
<a name="l00119"></a>00119 <span class="comment">/**</span>
<a name="l00120"></a>00120 <span class="comment"> * \brief checks the COMPLETED flag</span>
<a name="l00121"></a>00121 <span class="comment"> * can be used for ugly polling the slave if IRQs are not used</span>
<a name="l00122"></a>00122 <span class="comment"> * \param context struct grouping address information </span>
<a name="l00123"></a>00123 <span class="comment"> * \return 1 if still computing 0 if done.</span>
<a name="l00124"></a>00124 <span class="comment"> */</span>
<a name="l00125"></a><a class="code" href="avs__aes_8h.html#a827a78f73dd8fef9d2c9e72ad9bb4ea9">00125</a> <span class="keywordtype">int</span> <a class="code" href="avs__aes_8c.html#a827a78f73dd8fef9d2c9e72ad9bb4ea9" title="checks the COMPLETED flag can be used for ugly polling the slave if IRQs are not...">avs_aes_isBusy</a>(<a class="code" href="structavs__aes__handle.html" title="object storing addresses for this Avalon AES slave might be useful in case there...">avs_aes_handle</a>* context){
<a name="l00126"></a>00126 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> mycontrol = *(context-><a class="code" href="structavs__aes__handle.html#a15143869a0c8bfcacc8e1839e4e789c9" title="pointer to control word">control</a>);
<a name="l00127"></a>00127 <span class="keywordflow">return</span> mycontrol & 0x03;
<a name="l00128"></a>00128 }
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