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<div id="projectname">Crypto++
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<div id="projectbrief">Free C++ class library of cryptographic schemes</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 name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// gf256.h - originally written and placed in the public domain by Wei Dai</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"></span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">/// \file gf256.h</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">/// \brief Classes and functions for schemes over GF(256)</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"></span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="preprocessor">#ifndef CRYPTOPP_GF256_H</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="preprocessor">#define CRYPTOPP_GF256_H</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> </div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#include "<a class="code" href="cryptlib_8h.html">cryptlib.h</a>"</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor">#include "<a class="code" href="misc_8h.html">misc.h</a>"</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> </div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> NAMESPACE_BEGIN(<a class="code" href="namespace_crypto_p_p.html">CryptoPP</a>)</div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> </div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment">/// \brief GF(256) with polynomial basis</span></div><div class="line"><a name="l00015"></a><span class="lineno"><a class="line" href="class_g_f256.html"> 15</a></span> <span class="comment"></span>class <a class="code" href="class_g_f256.html">GF256</a></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> {</div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="keyword">public</span>:</div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span>  <span class="keyword">typedef</span> <span class="keywordtype">byte</span> Element;</div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  <span class="keyword">typedef</span> <span class="keywordtype">int</span> RandomizationParameter;</div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> </div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  <a class="code" href="class_g_f256.html">GF256</a>(<span class="keywordtype">byte</span> modulus) : m_modulus(modulus) {}</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> </div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  Element RandomElement(<a class="code" href="class_random_number_generator.html">RandomNumberGenerator</a> &rng, <span class="keywordtype">int</span> ignored = 0)<span class="keyword"> const</span></div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="keyword"> </span>{CRYPTOPP_UNUSED(ignored); <span class="keywordflow">return</span> rng.<a class="code" href="class_random_number_generator.html#ada0f7c437b0c8e6ba94ebcd75bff4bda">GenerateByte</a>();}</div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> </div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  <span class="keywordtype">bool</span> Equal(Element a, Element b)<span class="keyword"> const</span></div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="keyword"> </span>{<span class="keywordflow">return</span> a==b;}</div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> </div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  Element Zero()<span class="keyword"> const</span></div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="keyword"> </span>{<span class="keywordflow">return</span> 0;}</div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> </div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  Element Add(Element a, Element b)<span class="keyword"> const</span></div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="keyword"> </span>{<span class="keywordflow">return</span> a^b;}</div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> </div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  Element& Accumulate(Element &a, Element b)<span class="keyword"> const</span></div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="keyword"> </span>{<span class="keywordflow">return</span> a^=b;}</div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> </div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  Element Inverse(Element a)<span class="keyword"> const</span></div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="keyword"> </span>{<span class="keywordflow">return</span> a;}</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> </div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  Element Subtract(Element a, Element b)<span class="keyword"> const</span></div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="keyword"> </span>{<span class="keywordflow">return</span> a^b;}</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> </div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  Element& Reduce(Element &a, Element b)<span class="keyword"> const</span></div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="keyword"> </span>{<span class="keywordflow">return</span> a^=b;}</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span> </div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  Element Double(Element a)<span class="keyword"> const</span></div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="keyword"> </span>{CRYPTOPP_UNUSED(a); <span class="keywordflow">return</span> 0;}</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> </div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  Element One()<span class="keyword"> const</span></div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="keyword"> </span>{<span class="keywordflow">return</span> 1;}</div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span> </div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  Element Multiply(Element a, Element b) <span class="keyword">const</span>;</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span> </div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  Element <a class="code" href="class_square.html">Square</a>(Element a)<span class="keyword"> const</span></div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="keyword"> </span>{<span class="keywordflow">return</span> Multiply(a, a);}</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span> </div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keywordtype">bool</span> IsUnit(Element a)<span class="keyword"> const</span></div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="keyword"> </span>{<span class="keywordflow">return</span> a != 0;}</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span> </div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  Element MultiplicativeInverse(Element a) <span class="keyword">const</span>;</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span> </div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  Element Divide(Element a, Element b)<span class="keyword"> const</span></div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="keyword"> </span>{<span class="keywordflow">return</span> Multiply(a, MultiplicativeInverse(b));}</div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span> </div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="keyword">private</span>:</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  word m_modulus;</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span> };</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span> </div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span> NAMESPACE_END</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span> </div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="preprocessor">#endif</span></div><div class="ttc" id="misc_8h_html"><div class="ttname"><a href="misc_8h.html">misc.h</a></div><div class="ttdoc">Utility functions for the Crypto++ library.</div></div>
<div class="ttc" id="cryptlib_8h_html"><div class="ttname"><a href="cryptlib_8h.html">cryptlib.h</a></div><div class="ttdoc">Abstract base classes that provide a uniform interface to this library.</div></div>
<div class="ttc" id="class_square_html"><div class="ttname"><a href="class_square.html">Square</a></div><div class="ttdoc">Square block cipher.</div><div class="ttdef"><b>Definition:</b> <a href="square_8h_source.html#l00024">square.h:24</a></div></div>
<div class="ttc" id="class_random_number_generator_html"><div class="ttname"><a href="class_random_number_generator.html">RandomNumberGenerator</a></div><div class="ttdoc">Interface for random number generators.</div><div class="ttdef"><b>Definition:</b> <a href="cryptlib_8h_source.html#l01330">cryptlib.h:1330</a></div></div>
<div class="ttc" id="class_g_f256_html"><div class="ttname"><a href="class_g_f256.html">GF256</a></div><div class="ttdoc">GF(256) with polynomial basis.</div><div class="ttdef"><b>Definition:</b> <a href="gf256_8h_source.html#l00015">gf256.h:15</a></div></div>
<div class="ttc" id="class_random_number_generator_html_ada0f7c437b0c8e6ba94ebcd75bff4bda"><div class="ttname"><a href="class_random_number_generator.html#ada0f7c437b0c8e6ba94ebcd75bff4bda">RandomNumberGenerator::GenerateByte</a></div><div class="ttdeci">virtual byte GenerateByte()</div><div class="ttdoc">Generate new random byte and return it.</div><div class="ttdef"><b>Definition:</b> <a href="cryptlib_8cpp_source.html#l00282">cryptlib.cpp:282</a></div></div>
<div class="ttc" id="namespace_crypto_p_p_html"><div class="ttname"><a href="namespace_crypto_p_p.html">CryptoPP</a></div><div class="ttdoc">Crypto++ library namespace.</div></div>
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