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  <div class="headertitle"><div class="title">gf256.h</div></div>
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<a href="gf256_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno">    1</span><span class="comment">/*</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno">    2</span><span class="comment"> * This file is part of the Aaru Data Preservation Suite.</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno">    3</span><span class="comment"> * Copyright (c) 2019-2026 Natalia Portillo.</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno">    4</span><span class="comment"> *</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno">    5</span><span class="comment"> * This library is free software; you can redistribute it and/or modify</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno">    6</span><span class="comment"> * it under the terms of the GNU Lesser General Public License as</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno">    7</span><span class="comment"> * published by the Free Software Foundation; either version 2.1 of the</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno">    8</span><span class="comment"> * License, or (at your option) any later version.</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno">    9</span><span class="comment"> *</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno">   10</span><span class="comment"> * This library is distributed in the hope that it will be useful, but</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno">   11</span><span class="comment"> * WITHOUT ANY WARRANTY; without even the implied warranty of</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno">   12</span><span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno">   13</span><span class="comment"> * Lesser General Public License for more details.</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno">   14</span><span class="comment"> *</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno">   15</span><span class="comment"> * You should have received a copy of the GNU Lesser General Public</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno">   16</span><span class="comment"> * License along with this library; if not, see &lt;http://www.gnu.org/licenses/&gt;.</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno">   17</span><span class="comment"> */</span></div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno">   18</span> </div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno">   19</span><span class="preprocessor">#ifndef LIBAARUFORMAT_GF256_H</span></div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno">   20</span><span class="preprocessor">#define LIBAARUFORMAT_GF256_H</span></div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno">   21</span> </div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno">   22</span><span class="preprocessor">#include &lt;stddef.h&gt;</span></div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno">   23</span><span class="preprocessor">#include &lt;stdint.h&gt;</span></div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno">   24</span></div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno">   31</span>uint8_t <a class="code hl_function" href="gf256_8c.html#af1afff8141cfc915bb37fc01dab39995">gf256_mul</a>(uint8_t a, uint8_t b);</div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno">   32</span></div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno">   39</span>uint8_t <a class="code hl_function" href="gf256_8c.html#a1f0071a2ea261bdd2a59cc757a3ce13c">gf256_div</a>(uint8_t a, uint8_t b);</div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno">   40</span></div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno">   46</span>uint8_t <a class="code hl_function" href="gf256_8c.html#a43b3c7a9e2c10d25670fd961ae2916ca">gf256_inv</a>(uint8_t a);</div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno">   47</span></div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno">   59</span><span class="keywordtype">void</span> <a class="code hl_function" href="gf256_8c.html#ad9ea1dd38b7a45e2c9f967c26d7b05df">gf256_mul_region</a>(uint8_t *dst, <span class="keyword">const</span> uint8_t *src, uint8_t coeff, <span class="keywordtype">size_t</span> len);</div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno">   60</span></div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno">   70</span><span class="keywordtype">void</span> <a class="code hl_function" href="gf256_8c.html#a2e7b136d97e3214ff718f46542e276da">gf256_xor_region</a>(uint8_t *dst, <span class="keyword">const</span> uint8_t *src, <span class="keywordtype">size_t</span> len);</div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno">   71</span> </div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno">   72</span><span class="preprocessor">#endif </span><span class="comment">/* LIBAARUFORMAT_GF256_H */</span><span class="preprocessor"></span></div>
<div class="ttc" id="agf256_8c_html_a1f0071a2ea261bdd2a59cc757a3ce13c"><div class="ttname"><a href="gf256_8c.html#a1f0071a2ea261bdd2a59cc757a3ce13c">gf256_div</a></div><div class="ttdeci">uint8_t gf256_div(uint8_t a, uint8_t b)</div><div class="ttdoc">Divide two elements in GF(2^8).</div><div class="ttdef"><b>Definition</b> <a href="gf256_8c_source.html#l00084">gf256.c:84</a></div></div>
<div class="ttc" id="agf256_8c_html_a2e7b136d97e3214ff718f46542e276da"><div class="ttname"><a href="gf256_8c.html#a2e7b136d97e3214ff718f46542e276da">gf256_xor_region</a></div><div class="ttdeci">void gf256_xor_region(uint8_t *dst, const uint8_t *src, size_t len)</div><div class="ttdoc">XOR a region: dst[i] ^= src[i] for all i.</div><div class="ttdef"><b>Definition</b> <a href="gf256_8c_source.html#l00370">gf256.c:370</a></div></div>
<div class="ttc" id="agf256_8c_html_a43b3c7a9e2c10d25670fd961ae2916ca"><div class="ttname"><a href="gf256_8c.html#a43b3c7a9e2c10d25670fd961ae2916ca">gf256_inv</a></div><div class="ttdeci">uint8_t gf256_inv(uint8_t a)</div><div class="ttdoc">Compute multiplicative inverse in GF(2^8).</div><div class="ttdef"><b>Definition</b> <a href="gf256_8c_source.html#l00092">gf256.c:92</a></div></div>
<div class="ttc" id="agf256_8c_html_ad9ea1dd38b7a45e2c9f967c26d7b05df"><div class="ttname"><a href="gf256_8c.html#ad9ea1dd38b7a45e2c9f967c26d7b05df">gf256_mul_region</a></div><div class="ttdeci">void gf256_mul_region(uint8_t *dst, const uint8_t *src, uint8_t coeff, size_t len)</div><div class="ttdoc">Multiply-accumulate a region: dst[i] ^= GF_mul(src[i], coeff) for all i.</div><div class="ttdef"><b>Definition</b> <a href="gf256_8c_source.html#l00350">gf256.c:350</a></div></div>
<div class="ttc" id="agf256_8c_html_af1afff8141cfc915bb37fc01dab39995"><div class="ttname"><a href="gf256_8c.html#af1afff8141cfc915bb37fc01dab39995">gf256_mul</a></div><div class="ttdeci">uint8_t gf256_mul(uint8_t a, uint8_t b)</div><div class="ttdoc">Multiply two elements in GF(2^8) with polynomial 0x11D.</div><div class="ttdef"><b>Definition</b> <a href="gf256_8c_source.html#l00077">gf256.c:77</a></div></div>
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