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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>
67 
<a name="l00002"></a>00002 <span class="comment">*  \file avs_aes.c</span>
68 
<a name="l00003"></a>00003 <span class="comment">*  \brief AES Avalon IP Core software driver </span>
69 
<a name="l00004"></a>00004 <span class="comment">*</span>
70 
<a name="l00005"></a>00005 <span class="comment">*  This file is part of the project  avs_aes</span>
71 
<a name="l00006"></a>00006 <span class="comment">*  see: http://opencores.org/project,avs_aes</span>
72 
<a name="l00007"></a>00007 <span class="comment">* </span>
73 
<a name="l00008"></a>00008 <span class="comment">* \section AUTHORS</span>
74 
<a name="l00009"></a>00009 <span class="comment">*      Thomas Ruschival -- ruschi@opencores.org (www.ruschival.de)</span>
75 
<a name="l00010"></a>00010 <span class="comment">* </span>
76 
<a name="l00011"></a>00011 <span class="comment">* \section LICENSE</span>
77 
<a name="l00012"></a>00012 <span class="comment">*  Copyright (c) 2009, Authors and opencores.org</span>
78 
<a name="l00013"></a>00013 <span class="comment">*  All rights reserved.</span>
79 
<a name="l00014"></a>00014 <span class="comment">* </span>
80 
<a name="l00015"></a>00015 <span class="comment">*  Redistribution and use in source and binary forms, with or without modification,</span>
81 
<a name="l00016"></a>00016 <span class="comment">*  are permitted provided that the following conditions are met:</span>
82 
<a name="l00017"></a>00017 <span class="comment">*     * Redistributions of source code must retain the above copyright notice,</span>
83 
<a name="l00018"></a>00018 <span class="comment">*     this list of conditions and the following disclaimer.</span>
84 
<a name="l00019"></a>00019 <span class="comment">*     * Redistributions in binary form must reproduce the above copyright notice,</span>
85 
<a name="l00020"></a>00020 <span class="comment">*     this list of conditions and the following disclaimer in the documentation</span>
86 
<a name="l00021"></a>00021 <span class="comment">*     and/or other materials provided with the distribution.</span>
87 
<a name="l00022"></a>00022 <span class="comment">*     * Neither the name of the organization nor the names of its contributors</span>
88 
<a name="l00023"></a>00023 <span class="comment">*     may be used to endorse or promote products derived from this software without</span>
89 
<a name="l00024"></a>00024 <span class="comment">*     specific prior written permission.</span>
90 
<a name="l00025"></a>00025 <span class="comment">*  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS &quot;AS IS&quot;</span>
91 
<a name="l00026"></a>00026 <span class="comment">*  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE</span>
92 
<a name="l00027"></a>00027 <span class="comment">*  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE</span>
93 
<a name="l00028"></a>00028 <span class="comment">*  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE</span>
94 
<a name="l00029"></a>00029 <span class="comment">*  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,</span>
95 
<a name="l00030"></a>00030 <span class="comment">*  OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF</span>
96 
<a name="l00031"></a>00031 <span class="comment">*  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS</span>
97 
<a name="l00032"></a>00032 <span class="comment">*  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN</span>
98 
<a name="l00033"></a>00033 <span class="comment">*  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)</span>
99 
<a name="l00034"></a>00034 <span class="comment">*  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF</span>
100 
<a name="l00035"></a>00035 <span class="comment">*  THE POSSIBILITY OF SUCH DAMAGE   </span>
101 
<a name="l00036"></a>00036 <span class="comment">*/</span>
102 
<a name="l00037"></a>00037
103 
<a name="l00038"></a>00038
104 
<a name="l00039"></a>00039 <span class="preprocessor">#include &lt;<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>&gt;</span>
105 
<a name="l00040"></a>00040 <span class="preprocessor">#include &lt;string.h&gt;</span>
106 
<a name="l00041"></a>00041 <span class="comment"></span>
107 
<a name="l00042"></a>00042 <span class="comment">/**</span>
108 
<a name="l00043"></a>00043 <span class="comment"> * \brief setup the context to be used later.</span>
109 
<a name="l00044"></a>00044 <span class="comment"> * initializes the pointers to the correct memory locations</span>
110 
<a name="l00045"></a>00045 <span class="comment"> * \param context : struct grouping address information </span>
111 
<a name="l00046"></a>00046 <span class="comment"> */</span>
112 
<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){
113 
<a name="l00048"></a>00048     context-&gt;<a class="code" href="structavs__aes__handle.html#acb9eb474c8310afe4b082b79914f274c" title="pointer &amp;quot;KEY&amp;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&amp;#39;T CHANGE!">KEY_ADDR</a>;
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<a name="l00049"></a>00049     context-&gt;<a class="code" href="structavs__aes__handle.html#adae23dc33b7dec54b9da34f347256214" title="pointer &amp;quot;data&amp;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&amp;#39;T CHANGE!">DATA_ADDR</a>;
115 
<a name="l00050"></a>00050     context-&gt;<a class="code" href="structavs__aes__handle.html#ae0ad9e7bde68d07c018a299a0cda66af" title="pointer &amp;quot;RESULT&amp;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&amp;#39;T CHANGE!">RESULT_ADDR</a>;
116 
<a name="l00051"></a>00051     context-&gt;<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&amp;#39;T CHANGE!">AESCTRLWD</a>;
117 
<a name="l00052"></a>00052     *(context-&gt;<a class="code" href="structavs__aes__handle.html#a15143869a0c8bfcacc8e1839e4e789c9" title="pointer to control word">control</a>) = 0x00000000;
118 
<a name="l00053"></a>00053 }
119 
<a name="l00054"></a>00054
120 
<a name="l00055"></a>00055 <span class="comment"></span>
121 
<a name="l00056"></a>00056 <span class="comment">/**</span>
122 
<a name="l00057"></a>00057 <span class="comment"> * \brief setup the context to be used later.</span>
123 
<a name="l00058"></a>00058 <span class="comment"> * initializes the pointers to the correct memory locations</span>
124 
<a name="l00059"></a>00059 <span class="comment"> * \param context  struct grouping address information </span>
125 
<a name="l00060"></a>00060 <span class="comment"> * \param key user key to load</span>
126 
<a name="l00061"></a>00061 <span class="comment"> */</span>
127 
<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){
128 
<a name="l00063"></a>00063     <span class="keywordtype">int</span> i=0;
129 
<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-&gt;<a class="code" href="structavs__aes__handle.html#acb9eb474c8310afe4b082b79914f274c" title="pointer &amp;quot;KEY&amp;quot; field in memory mapping">key</a>;
130 
<a name="l00065"></a>00065     <span class="comment">// Invalidate old key;</span>
131 
<a name="l00066"></a>00066     *(context-&gt;<a class="code" href="structavs__aes__handle.html#a15143869a0c8bfcacc8e1839e4e789c9" title="pointer to control word">control</a>) &amp;= (~0x00000080);
132 
<a name="l00067"></a>00067     <span class="keywordflow">for</span>(i=0; i&lt;<a class="code" href="avs__aes_8h.html#a40ac9fbe108b0ea74f57215528f13196" title="Keylength 256 Bit AES.">KEYWORDS</a>; i++){
133 
<a name="l00068"></a>00068         *(target_ptr++) = *(key++);
134 
<a name="l00069"></a>00069     }
135 
<a name="l00070"></a>00070     <span class="comment">// validate key;</span>
136 
<a name="l00071"></a>00071     *(context-&gt;<a class="code" href="structavs__aes__handle.html#a15143869a0c8bfcacc8e1839e4e789c9" title="pointer to control word">control</a>) |= 0x00000080;
137 
<a name="l00072"></a>00072 }
138 
<a name="l00073"></a>00073
139 
<a name="l00074"></a>00074 <span class="comment"></span>
140 
<a name="l00075"></a>00075 <span class="comment">/**</span>
141 
<a name="l00076"></a>00076 <span class="comment"> * \brief loads payload for processing to the core</span>
142 
<a name="l00077"></a>00077 <span class="comment"> * basically memcopy...</span>
143 
<a name="l00078"></a>00078 <span class="comment"> * \param context  struct grouping address information </span>
144 
<a name="l00079"></a>00079 <span class="comment"> * \param payload user data to be processed</span>
145 
<a name="l00080"></a>00080 <span class="comment"> */</span>
146 
<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){
147 
<a name="l00082"></a>00082     <span class="keywordtype">int</span> i=0;
148 
<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-&gt;<a class="code" href="structavs__aes__handle.html#adae23dc33b7dec54b9da34f347256214" title="pointer &amp;quot;data&amp;quot; field in memory mapping used for both decryption and encryption...">payload</a>;
149 
<a name="l00084"></a>00084     <span class="keywordflow">for</span>(i=0; i&lt;4; i++){
150 
<a name="l00085"></a>00085         *(target_ptr++) = *(payload++);
151 
<a name="l00086"></a>00086     }
152 
<a name="l00087"></a>00087 }
153 
<a name="l00088"></a>00088
154 
<a name="l00089"></a>00089
155 
<a name="l00090"></a>00090 <span class="comment"></span>
156 
<a name="l00091"></a>00091 <span class="comment">/**</span>
157 
<a name="l00092"></a>00092 <span class="comment"> * \brief set the KEY_VALID flag in the control word</span>
158 
<a name="l00093"></a>00093 <span class="comment"> * used to signal the completion of writing the key ( \ref avs_aes_setKey )</span>
159 
<a name="l00094"></a>00094 <span class="comment"> * \param context  struct grouping address information </span>
160 
<a name="l00095"></a>00095 <span class="comment"> */</span>
161 
<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){
162 
<a name="l00097"></a>00097     *(context-&gt;<a class="code" href="structavs__aes__handle.html#a15143869a0c8bfcacc8e1839e4e789c9" title="pointer to control word">control</a>) |= 0x00000080;
163 
<a name="l00098"></a>00098 }
164 
<a name="l00099"></a>00099
165 
<a name="l00100"></a>00100 <span class="comment"></span>
166 
<a name="l00101"></a>00101 <span class="comment">/**</span>
167 
<a name="l00102"></a>00102 <span class="comment"> * \brief set the ENCRYPT flag in the control word</span>
168 
<a name="l00103"></a>00103 <span class="comment"> * start encryption of (hopefully) previously loaded payload </span>
169 
<a name="l00104"></a>00104 <span class="comment"> * \param context  struct grouping address information </span>
170 
<a name="l00105"></a>00105 <span class="comment"> */</span>
171 
<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){
172 
<a name="l00107"></a>00107     *(context-&gt;<a class="code" href="structavs__aes__handle.html#a15143869a0c8bfcacc8e1839e4e789c9" title="pointer to control word">control</a>) |= 0x00000001;
173 
<a name="l00108"></a>00108 }
174 
<a name="l00109"></a>00109 <span class="comment"></span>
175 
<a name="l00110"></a>00110 <span class="comment">/**</span>
176 
<a name="l00111"></a>00111 <span class="comment"> * \brief set the DECRYPT flag in the control word</span>
177 
<a name="l00112"></a>00112 <span class="comment"> * start encryption of (hopefully) previously loaded payload </span>
178 
<a name="l00113"></a>00113 <span class="comment"> * \param context  struct grouping address information </span>
179 
<a name="l00114"></a>00114 <span class="comment"> */</span>
180 
<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){
181 
<a name="l00116"></a>00116     *(context-&gt;<a class="code" href="structavs__aes__handle.html#a15143869a0c8bfcacc8e1839e4e789c9" title="pointer to control word">control</a>) |= 0x00000002;
182 
<a name="l00117"></a>00117 }
183 
<a name="l00118"></a>00118 <span class="comment"></span>
184 
<a name="l00119"></a>00119 <span class="comment">/**</span>
185 
<a name="l00120"></a>00120 <span class="comment"> * \brief checks the COMPLETED flag</span>
186 
<a name="l00121"></a>00121 <span class="comment"> * can be used for ugly polling the slave if IRQs are not used</span>
187 
<a name="l00122"></a>00122 <span class="comment"> * \param context  struct grouping address information </span>
188 
<a name="l00123"></a>00123 <span class="comment"> * \return 1 if still computing 0 if done.</span>
189 
<a name="l00124"></a>00124 <span class="comment"> */</span>
190 
<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){
191 
<a name="l00126"></a>00126     <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> mycontrol = *(context-&gt;<a class="code" href="structavs__aes__handle.html#a15143869a0c8bfcacc8e1839e4e789c9" title="pointer to control word">control</a>);
192 
<a name="l00127"></a>00127     <span class="keywordflow">return</span> mycontrol &amp; 0x03;
193 
<a name="l00128"></a>00128 }
194 
</pre></div></div>
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<hr size="1"/><address style="text-align: right;"><small>Generated on Fri Apr 2 23:22:36 2010 for AES Avalon Slave (avs_aes) by&nbsp;
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