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<div class="title">GHASH.cpp</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>&#160;<span class="comment">/*</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span>&#160;<span class="comment"> * Copyright (C) 2015 Southern Storm Software, Pty Ltd.</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span>&#160;<span class="comment"> * Permission is hereby granted, free of charge, to any person obtaining a</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span>&#160;<span class="comment"> * copy of this software and associated documentation files (the &quot;Software&quot;),</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span>&#160;<span class="comment"> * to deal in the Software without restriction, including without limitation</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span>&#160;<span class="comment"> * the rights to use, copy, modify, merge, publish, distribute, sublicense,</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160;<span class="comment"> * and/or sell copies of the Software, and to permit persons to whom the</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;<span class="comment"> * Software is furnished to do so, subject to the following conditions:</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;<span class="comment"> * The above copyright notice and this permission notice shall be included</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160;<span class="comment"> * in all copies or substantial portions of the Software.</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160;<span class="comment"> * THE SOFTWARE IS PROVIDED &quot;AS IS&quot;, WITHOUT WARRANTY OF ANY KIND, EXPRESS</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160;<span class="comment"> * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160;<span class="comment"> * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;<span class="comment"> * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160;<span class="comment"> * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160;<span class="comment"> * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160;<span class="comment"> * DEALINGS IN THE SOFTWARE.</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160;</div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160;<span class="preprocessor">#include &quot;GHASH.h&quot;</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>&#160;<span class="preprocessor">#include &quot;GF128.h&quot;</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>&#160;<span class="preprocessor">#include &quot;Crypto.h&quot;</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>&#160;<span class="preprocessor">#include &lt;string.h&gt;</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>&#160;</div>
<div class="line"><a name="l00047"></a><span class="lineno"><a class="line" href="classGHASH.html#a3a1abd0f641bccd9b4aa1f40beb8dca3"> 47</a></span>&#160;<a class="code" href="classGHASH.html#a3a1abd0f641bccd9b4aa1f40beb8dca3">GHASH::GHASH</a>()</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160;{</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160; state.posn = 0;</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>&#160;}</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160;</div>
<div class="line"><a name="l00055"></a><span class="lineno"><a class="line" href="classGHASH.html#ae7f63a587adf1aa1ffcdc0a6e20584fd"> 55</a></span>&#160;<a class="code" href="classGHASH.html#ae7f63a587adf1aa1ffcdc0a6e20584fd">GHASH::~GHASH</a>()</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160;{</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160; clean(state);</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160;}</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160;</div>
<div class="line"><a name="l00067"></a><span class="lineno"><a class="line" href="classGHASH.html#a479a3e8c37e320bf99f54b95bf5f4c55"> 67</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="classGHASH.html#a479a3e8c37e320bf99f54b95bf5f4c55">GHASH::reset</a>(<span class="keyword">const</span> <span class="keywordtype">void</span> *key)</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160;{</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160; <a class="code" href="classGF128.html#a43adbd72619e4f97ce427a60e7c0a248">GF128::mulInit</a>(state.H, key);</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160; memset(state.Y, 0, <span class="keyword">sizeof</span>(state.Y));</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160; state.posn = 0;</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160;}</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160;</div>
<div class="line"><a name="l00085"></a><span class="lineno"><a class="line" href="classGHASH.html#a235edb14c6ed1ec55ddda595816ef1c7"> 85</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="classGHASH.html#a235edb14c6ed1ec55ddda595816ef1c7">GHASH::update</a>(<span class="keyword">const</span> <span class="keywordtype">void</span> *data, <span class="keywordtype">size_t</span> len)</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>&#160;{</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>&#160; <span class="comment">// XOR the input with state.Y in 128-bit chunks and process them.</span></div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>&#160; <span class="keyword">const</span> uint8_t *d = (<span class="keyword">const</span> uint8_t *)data;</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>&#160; <span class="keywordflow">while</span> (len &gt; 0) {</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>&#160; uint8_t size = 16 - state.posn;</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>&#160; <span class="keywordflow">if</span> (size &gt; len)</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>&#160; size = len;</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>&#160; uint8_t *y = ((uint8_t *)state.Y) + state.posn;</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>&#160; <span class="keywordflow">for</span> (uint8_t i = 0; i &lt; size; ++i)</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>&#160; y[i] ^= d[i];</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>&#160; state.posn += size;</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>&#160; len -= size;</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>&#160; d += size;</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>&#160; <span class="keywordflow">if</span> (state.posn == 16) {</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>&#160; <a class="code" href="classGF128.html#a7d9a341a1715d37d25feba21627bc3ab">GF128::mul</a>(state.Y, state.H);</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>&#160; state.posn = 0;</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>&#160; }</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>&#160; }</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>&#160;}</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>&#160;</div>
<div class="line"><a name="l00121"></a><span class="lineno"><a class="line" href="classGHASH.html#ab221298ca69c9612bfbfd3dedcb28307"> 121</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="classGHASH.html#ab221298ca69c9612bfbfd3dedcb28307">GHASH::finalize</a>(<span class="keywordtype">void</span> *token, <span class="keywordtype">size_t</span> len)</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>&#160;{</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>&#160; <span class="comment">// Pad with zeroes to a multiple of 16 bytes.</span></div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>&#160; <a class="code" href="classGHASH.html#a8c38ee9313605f1d8b12dca7cd43e4ad">pad</a>();</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>&#160;</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>&#160; <span class="comment">// The token is the current value of Y.</span></div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>&#160; <span class="keywordflow">if</span> (len &gt; 16)</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>&#160; len = 16;</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>&#160; memcpy(token, state.Y, len);</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>&#160;}</div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>&#160;</div>
<div class="line"><a name="l00137"></a><span class="lineno"><a class="line" href="classGHASH.html#a8c38ee9313605f1d8b12dca7cd43e4ad"> 137</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="classGHASH.html#a8c38ee9313605f1d8b12dca7cd43e4ad">GHASH::pad</a>()</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>&#160;{</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>&#160; <span class="keywordflow">if</span> (state.posn != 0) {</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>&#160; <span class="comment">// Padding involves XOR&#39;ing the rest of state.Y with zeroes,</span></div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>&#160; <span class="comment">// which does nothing. Immediately process the next chunk.</span></div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>&#160; <a class="code" href="classGF128.html#a7d9a341a1715d37d25feba21627bc3ab">GF128::mul</a>(state.Y, state.H);</div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>&#160; state.posn = 0;</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>&#160; }</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>&#160;}</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>&#160;</div>
<div class="line"><a name="l00150"></a><span class="lineno"><a class="line" href="classGHASH.html#a4b1ee789debf56f7f24807960ef0556e"> 150</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="classGHASH.html#a4b1ee789debf56f7f24807960ef0556e">GHASH::clear</a>()</div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>&#160;{</div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>&#160; clean(state);</div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>&#160;}</div>
<div class="ttc" id="classGHASH_html_ab221298ca69c9612bfbfd3dedcb28307"><div class="ttname"><a href="classGHASH.html#ab221298ca69c9612bfbfd3dedcb28307">GHASH::finalize</a></div><div class="ttdeci">void finalize(void *token, size_t len)</div><div class="ttdoc">Finalizes the authentication process and returns the token. </div><div class="ttdef"><b>Definition:</b> <a href="GHASH_8cpp_source.html#l00121">GHASH.cpp:121</a></div></div>
<div class="ttc" id="classGHASH_html_a235edb14c6ed1ec55ddda595816ef1c7"><div class="ttname"><a href="classGHASH.html#a235edb14c6ed1ec55ddda595816ef1c7">GHASH::update</a></div><div class="ttdeci">void update(const void *data, size_t len)</div><div class="ttdoc">Updates the message authenticator with more data. </div><div class="ttdef"><b>Definition:</b> <a href="GHASH_8cpp_source.html#l00085">GHASH.cpp:85</a></div></div>
<div class="ttc" id="classGHASH_html_ae7f63a587adf1aa1ffcdc0a6e20584fd"><div class="ttname"><a href="classGHASH.html#ae7f63a587adf1aa1ffcdc0a6e20584fd">GHASH::~GHASH</a></div><div class="ttdeci">~GHASH()</div><div class="ttdoc">Destroys this GHASH message authenticator. </div><div class="ttdef"><b>Definition:</b> <a href="GHASH_8cpp_source.html#l00055">GHASH.cpp:55</a></div></div>
<div class="ttc" id="classGHASH_html_a8c38ee9313605f1d8b12dca7cd43e4ad"><div class="ttname"><a href="classGHASH.html#a8c38ee9313605f1d8b12dca7cd43e4ad">GHASH::pad</a></div><div class="ttdeci">void pad()</div><div class="ttdoc">Pads the input stream with zero bytes to a multiple of 16. </div><div class="ttdef"><b>Definition:</b> <a href="GHASH_8cpp_source.html#l00137">GHASH.cpp:137</a></div></div>
<div class="ttc" id="classGHASH_html_a4b1ee789debf56f7f24807960ef0556e"><div class="ttname"><a href="classGHASH.html#a4b1ee789debf56f7f24807960ef0556e">GHASH::clear</a></div><div class="ttdeci">void clear()</div><div class="ttdoc">Clears the authenticator&#39;s state, removing all sensitive data. </div><div class="ttdef"><b>Definition:</b> <a href="GHASH_8cpp_source.html#l00150">GHASH.cpp:150</a></div></div>
<div class="ttc" id="classGF128_html_a7d9a341a1715d37d25feba21627bc3ab"><div class="ttname"><a href="classGF128.html#a7d9a341a1715d37d25feba21627bc3ab">GF128::mul</a></div><div class="ttdeci">static void mul(uint32_t Y[4], const uint32_t H[4])</div><div class="ttdoc">Perform a multiplication in the GF(2^128) field. </div><div class="ttdef"><b>Definition:</b> <a href="GF128_8cpp_source.html#l00090">GF128.cpp:90</a></div></div>
<div class="ttc" id="classGHASH_html_a3a1abd0f641bccd9b4aa1f40beb8dca3"><div class="ttname"><a href="classGHASH.html#a3a1abd0f641bccd9b4aa1f40beb8dca3">GHASH::GHASH</a></div><div class="ttdeci">GHASH()</div><div class="ttdoc">Constructs a new GHASH message authenticator. </div><div class="ttdef"><b>Definition:</b> <a href="GHASH_8cpp_source.html#l00047">GHASH.cpp:47</a></div></div>
<div class="ttc" id="classGHASH_html_a479a3e8c37e320bf99f54b95bf5f4c55"><div class="ttname"><a href="classGHASH.html#a479a3e8c37e320bf99f54b95bf5f4c55">GHASH::reset</a></div><div class="ttdeci">void reset(const void *key)</div><div class="ttdoc">Resets the GHASH message authenticator for a new session. </div><div class="ttdef"><b>Definition:</b> <a href="GHASH_8cpp_source.html#l00067">GHASH.cpp:67</a></div></div>
<div class="ttc" id="classGF128_html_a43adbd72619e4f97ce427a60e7c0a248"><div class="ttname"><a href="classGF128.html#a43adbd72619e4f97ce427a60e7c0a248">GF128::mulInit</a></div><div class="ttdeci">static void mulInit(uint32_t H[4], const void *key)</div><div class="ttdoc">Initialize multiplication in the GF(2^128) field. </div><div class="ttdef"><b>Definition:</b> <a href="GF128_8cpp_source.html#l00058">GF128.cpp:58</a></div></div>
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