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<li class="navelem"><a class="el" href="dir_bc0718b08fb2015b8e59c47b2805f60c.html">libraries</a></li><li class="navelem"><a class="el" href="dir_e2ce51835550ba18edf07a8311722290.html">Crypto</a></li> </ul>
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<div class="title">OMAC.cpp</div> </div>
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<div class="contents">
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/*</span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> * Copyright (C) 2016 Southern Storm Software, Pty Ltd.</span></div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> *</span></div>
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * Permission is hereby granted, free of charge, to any person obtaining a</span></div>
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<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> * copy of this software and associated documentation files (the "Software"),</span></div>
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<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * to deal in the Software without restriction, including without limitation</span></div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * the rights to use, copy, modify, merge, publish, distribute, sublicense,</span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * and/or sell copies of the Software, and to permit persons to whom the</span></div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * Software is furnished to do so, subject to the following conditions:</span></div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> *</span></div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * The above copyright notice and this permission notice shall be included</span></div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * in all copies or substantial portions of the Software.</span></div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> *</span></div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS</span></div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,</span></div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE</span></div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER</span></div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING</span></div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER</span></div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> * DEALINGS IN THE SOFTWARE.</span></div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> */</span></div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> </div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor">#include "OMAC.h"</span></div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor">#include "GF128.h"</span></div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor">#include "Crypto.h"</span></div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="preprocessor">#include <string.h></span></div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> </div>
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<div class="line"><a name="l00048"></a><span class="lineno"><a class="line" href="classOMAC.html#ae84365423cef3f769464489848942559"> 48</a></span> <a class="code" href="classOMAC.html#ae84365423cef3f769464489848942559">OMAC::OMAC</a>()</div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  : _blockCipher(0)</div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  , posn(0)</div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> {</div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> }</div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> </div>
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<div class="line"><a name="l00059"></a><span class="lineno"><a class="line" href="classOMAC.html#a6bb2222c997608ec68b25831da965e8f"> 59</a></span> <a class="code" href="classOMAC.html#a6bb2222c997608ec68b25831da965e8f">OMAC::~OMAC</a>()</div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> {</div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  clean(b);</div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> }</div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> </div>
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<div class="line"><a name="l00101"></a><span class="lineno"><a class="line" href="classOMAC.html#a0274138725ddf6240c030574bae3975c"> 101</a></span> <span class="keywordtype">void</span> <a class="code" href="classOMAC.html#a0274138725ddf6240c030574bae3975c">OMAC::initFirst</a>(uint8_t omac[16])</div>
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<div class="line"><a name="l00102"></a><span class="lineno"> 102</span> {</div>
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<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="comment">// Start the OMAC context. We assume that the data that follows</span></div>
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<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="comment">// will be at least 1 byte in length so that we can encrypt the</span></div>
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<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="comment">// zeroes now to derive the B value.</span></div>
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<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  memset(omac, 0, 16);</div>
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<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  _blockCipher-><a class="code" href="classBlockCipher.html#aed0788b25f6bb2f1bd47d5a5f0c5db33">encryptBlock</a>(omac, omac);</div>
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<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  posn = 0;</div>
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<div class="line"><a name="l00109"></a><span class="lineno"> 109</span> </div>
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<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="comment">// Generate the B value from the encrypted block of zeroes.</span></div>
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<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="comment">// We will need this later when finalising the OMAC hashes.</span></div>
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<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  memcpy(b, omac, 16);</div>
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<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <a class="code" href="classGF128.html#a56000a4cd7d436de42360e9d43eecde4">GF128::dblEAX</a>(b);</div>
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<div class="line"><a name="l00114"></a><span class="lineno"> 114</span> }</div>
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<div class="line"><a name="l00115"></a><span class="lineno"> 115</span> </div>
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<div class="line"><a name="l00127"></a><span class="lineno"><a class="line" href="classOMAC.html#ad496c7d2de4f22fd4192345003e75ee5"> 127</a></span> <span class="keywordtype">void</span> <a class="code" href="classOMAC.html#ad496c7d2de4f22fd4192345003e75ee5">OMAC::initNext</a>(uint8_t omac[16], uint8_t tag)</div>
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<div class="line"><a name="l00128"></a><span class="lineno"> 128</span> {</div>
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<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  memset(omac, 0, 15);</div>
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<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  omac[15] = tag;</div>
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<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  posn = 16;</div>
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<div class="line"><a name="l00132"></a><span class="lineno"> 132</span> }</div>
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<div class="line"><a name="l00133"></a><span class="lineno"> 133</span> </div>
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<div class="line"><a name="l00143"></a><span class="lineno"><a class="line" href="classOMAC.html#a6692d7f37dd097fdfdd2b198aa0d9cde"> 143</a></span> <span class="keywordtype">void</span> <a class="code" href="classOMAC.html#a6692d7f37dd097fdfdd2b198aa0d9cde">OMAC::update</a>(uint8_t omac[16], <span class="keyword">const</span> uint8_t *data, <span class="keywordtype">size_t</span> size)</div>
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<div class="line"><a name="l00144"></a><span class="lineno"> 144</span> {</div>
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<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  <span class="keywordflow">while</span> (size > 0) {</div>
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<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  <span class="comment">// Encrypt the current block if it is already full.</span></div>
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<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  <span class="keywordflow">if</span> (posn == 16) {</div>
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<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  _blockCipher-><a class="code" href="classBlockCipher.html#aed0788b25f6bb2f1bd47d5a5f0c5db33">encryptBlock</a>(omac, omac);</div>
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<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  posn = 0;</div>
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<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  }</div>
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<div class="line"><a name="l00151"></a><span class="lineno"> 151</span> </div>
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<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  <span class="comment">// XOR the incoming data with the current block.</span></div>
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<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  uint8_t len = 16 - posn;</div>
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<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  <span class="keywordflow">if</span> (len > size)</div>
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<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  len = (uint8_t)size;</div>
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<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  <span class="keywordflow">for</span> (uint8_t index = 0; index < len; ++index)</div>
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<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  omac[posn++] ^= data[index];</div>
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<div class="line"><a name="l00158"></a><span class="lineno"> 158</span> </div>
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<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  <span class="comment">// Move onto the next block.</span></div>
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<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  size -= len;</div>
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<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  data += len;</div>
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<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  }</div>
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<div class="line"><a name="l00163"></a><span class="lineno"> 163</span> }</div>
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<div class="line"><a name="l00164"></a><span class="lineno"> 164</span> </div>
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<div class="line"><a name="l00172"></a><span class="lineno"><a class="line" href="classOMAC.html#ae4ccdaee764df779f7ae0c7433078b3e"> 172</a></span> <span class="keywordtype">void</span> <a class="code" href="classOMAC.html#ae4ccdaee764df779f7ae0c7433078b3e">OMAC::finalize</a>(uint8_t omac[16])</div>
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<div class="line"><a name="l00173"></a><span class="lineno"> 173</span> {</div>
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<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  <span class="comment">// Apply padding if necessary.</span></div>
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<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  <span class="keywordflow">if</span> (posn != 16) {</div>
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<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  <span class="comment">// Need padding: XOR with P = 2 * B.</span></div>
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<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  uint32_t p[4];</div>
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<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  memcpy(p, b, 16);</div>
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<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  <a class="code" href="classGF128.html#a56000a4cd7d436de42360e9d43eecde4">GF128::dblEAX</a>(p);</div>
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<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  omac[posn] ^= 0x80;</div>
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<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  <span class="keywordflow">for</span> (uint8_t index = 0; index < 16; ++index)</div>
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<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  omac[index] ^= ((<span class="keyword">const</span> uint8_t *)p)[index];</div>
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<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  clean(p);</div>
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<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  } <span class="keywordflow">else</span> {</div>
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<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  <span class="comment">// No padding necessary: XOR with B.</span></div>
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<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  <span class="keywordflow">for</span> (uint8_t index = 0; index < 16; ++index)</div>
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<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  omac[index] ^= ((<span class="keyword">const</span> uint8_t *)b)[index];</div>
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<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  }</div>
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<div class="line"><a name="l00189"></a><span class="lineno"> 189</span> </div>
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<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  <span class="comment">// Encrypt the hash to get the final OMAC value.</span></div>
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<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  _blockCipher-><a class="code" href="classBlockCipher.html#aed0788b25f6bb2f1bd47d5a5f0c5db33">encryptBlock</a>(omac, omac);</div>
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<div class="line"><a name="l00192"></a><span class="lineno"> 192</span> }</div>
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<div class="line"><a name="l00193"></a><span class="lineno"> 193</span> </div>
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<div class="line"><a name="l00197"></a><span class="lineno"><a class="line" href="classOMAC.html#a072715dbda39dc9c360cfcaab31d6aa7"> 197</a></span> <span class="keywordtype">void</span> <a class="code" href="classOMAC.html#a072715dbda39dc9c360cfcaab31d6aa7">OMAC::clear</a>()</div>
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<div class="line"><a name="l00198"></a><span class="lineno"> 198</span> {</div>
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<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  clean(b);</div>
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<div class="line"><a name="l00200"></a><span class="lineno"> 200</span> }</div>
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<div class="ttc" id="classOMAC_html_a072715dbda39dc9c360cfcaab31d6aa7"><div class="ttname"><a href="classOMAC.html#a072715dbda39dc9c360cfcaab31d6aa7">OMAC::clear</a></div><div class="ttdeci">void clear()</div><div class="ttdoc">Clears all security-sensitive state from this object. </div><div class="ttdef"><b>Definition:</b> <a href="OMAC_8cpp_source.html#l00197">OMAC.cpp:197</a></div></div>
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<div class="ttc" id="classOMAC_html_ae4ccdaee764df779f7ae0c7433078b3e"><div class="ttname"><a href="classOMAC.html#ae4ccdaee764df779f7ae0c7433078b3e">OMAC::finalize</a></div><div class="ttdeci">void finalize(uint8_t omac[16])</div><div class="ttdoc">Finalises an OMAC hashing context. </div><div class="ttdef"><b>Definition:</b> <a href="OMAC_8cpp_source.html#l00172">OMAC.cpp:172</a></div></div>
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<div class="ttc" id="classOMAC_html_a6bb2222c997608ec68b25831da965e8f"><div class="ttname"><a href="classOMAC.html#a6bb2222c997608ec68b25831da965e8f">OMAC::~OMAC</a></div><div class="ttdeci">~OMAC()</div><div class="ttdoc">Destroys this OMAC object. </div><div class="ttdef"><b>Definition:</b> <a href="OMAC_8cpp_source.html#l00059">OMAC.cpp:59</a></div></div>
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<div class="ttc" id="classGF128_html_a56000a4cd7d436de42360e9d43eecde4"><div class="ttname"><a href="classGF128.html#a56000a4cd7d436de42360e9d43eecde4">GF128::dblEAX</a></div><div class="ttdeci">static void dblEAX(uint32_t V[4])</div><div class="ttdoc">Doubles a value in the GF(2^128) field using EAX conventions. </div><div class="ttdef"><b>Definition:</b> <a href="GF128_8cpp_source.html#l00406">GF128.cpp:406</a></div></div>
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<div class="ttc" id="classBlockCipher_html_aed0788b25f6bb2f1bd47d5a5f0c5db33"><div class="ttname"><a href="classBlockCipher.html#aed0788b25f6bb2f1bd47d5a5f0c5db33">BlockCipher::encryptBlock</a></div><div class="ttdeci">virtual void encryptBlock(uint8_t *output, const uint8_t *input)=0</div><div class="ttdoc">Encrypts a single block using this cipher. </div></div>
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<div class="ttc" id="classOMAC_html_ad496c7d2de4f22fd4192345003e75ee5"><div class="ttname"><a href="classOMAC.html#ad496c7d2de4f22fd4192345003e75ee5">OMAC::initNext</a></div><div class="ttdeci">void initNext(uint8_t omac[16], uint8_t tag)</div><div class="ttdoc">Initialises or restarts an OMAC hashing context. </div><div class="ttdef"><b>Definition:</b> <a href="OMAC_8cpp_source.html#l00127">OMAC.cpp:127</a></div></div>
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<div class="ttc" id="classOMAC_html_a6692d7f37dd097fdfdd2b198aa0d9cde"><div class="ttname"><a href="classOMAC.html#a6692d7f37dd097fdfdd2b198aa0d9cde">OMAC::update</a></div><div class="ttdeci">void update(uint8_t omac[16], const uint8_t *data, size_t size)</div><div class="ttdoc">Updates an OMAC hashing context with more data. </div><div class="ttdef"><b>Definition:</b> <a href="OMAC_8cpp_source.html#l00143">OMAC.cpp:143</a></div></div>
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<div class="ttc" id="classOMAC_html_ae84365423cef3f769464489848942559"><div class="ttname"><a href="classOMAC.html#ae84365423cef3f769464489848942559">OMAC::OMAC</a></div><div class="ttdeci">OMAC()</div><div class="ttdoc">Constructs a new OMAC object. </div><div class="ttdef"><b>Definition:</b> <a href="OMAC_8cpp_source.html#l00048">OMAC.cpp:48</a></div></div>
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<div class="ttc" id="classOMAC_html_a0274138725ddf6240c030574bae3975c"><div class="ttname"><a href="classOMAC.html#a0274138725ddf6240c030574bae3975c">OMAC::initFirst</a></div><div class="ttdeci">void initFirst(uint8_t omac[16])</div><div class="ttdoc">Initialises the first OMAC hashing context and creates the B value. </div><div class="ttdef"><b>Definition:</b> <a href="OMAC_8cpp_source.html#l00101">OMAC.cpp:101</a></div></div>
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