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cryptopp-doc-5.6.1-0.1.svn479.fc13.i686.rpm

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<h1>gf256.h</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="preprocessor">#ifndef CRYPTOPP_GF256_H</span>
<a name="l00002"></a>00002 <span class="preprocessor"></span><span class="preprocessor">#define CRYPTOPP_GF256_H</span>
<a name="l00003"></a>00003 <span class="preprocessor"></span>
<a name="l00004"></a>00004 <span class="preprocessor">#include &quot;<a class="code" href="cryptlib_8h.html">cryptlib.h</a>&quot;</span>
<a name="l00005"></a>00005 
<a name="l00006"></a>00006 NAMESPACE_BEGIN(CryptoPP)
<a name="l00007"></a>00007 
<a name="l00008"></a>00008 <span class="comment">//! GF(256) with polynomial basis</span>
<a name="l00009"></a><a class="code" href="class_g_f256.html">00009</a> <span class="comment"></span>class <a class="code" href="class_g_f256.html" title="GF(256) with polynomial basis.">GF256</a>
<a name="l00010"></a>00010 {
<a name="l00011"></a>00011 <span class="keyword">public</span>:
<a name="l00012"></a>00012         <span class="keyword">typedef</span> byte Element;
<a name="l00013"></a>00013         <span class="keyword">typedef</span> <span class="keywordtype">int</span> RandomizationParameter;
<a name="l00014"></a>00014 
<a name="l00015"></a>00015         GF256(byte modulus) : m_modulus(modulus) {}
<a name="l00016"></a>00016 
<a name="l00017"></a>00017         Element RandomElement(<a class="code" href="class_random_number_generator.html" title="interface for random number generators">RandomNumberGenerator</a> &amp;rng, <span class="keywordtype">int</span> ignored = 0)<span class="keyword"> const</span>
<a name="l00018"></a>00018 <span class="keyword">                </span>{<span class="keywordflow">return</span> rng.<a class="code" href="class_random_number_generator.html#ada0f7c437b0c8e6ba94ebcd75bff4bda" title="generate new random byte and return it">GenerateByte</a>();}
<a name="l00019"></a>00019 
<a name="l00020"></a>00020         <span class="keywordtype">bool</span> Equal(Element a, Element b)<span class="keyword"> const</span>
<a name="l00021"></a>00021 <span class="keyword">                </span>{<span class="keywordflow">return</span> a==b;}
<a name="l00022"></a>00022 
<a name="l00023"></a>00023         Element Zero()<span class="keyword"> const</span>
<a name="l00024"></a>00024 <span class="keyword">                </span>{<span class="keywordflow">return</span> 0;}
<a name="l00025"></a>00025 
<a name="l00026"></a>00026         Element Add(Element a, Element b)<span class="keyword"> const</span>
<a name="l00027"></a>00027 <span class="keyword">                </span>{<span class="keywordflow">return</span> a^b;}
<a name="l00028"></a>00028 
<a name="l00029"></a>00029         Element&amp; Accumulate(Element &amp;a, Element b)<span class="keyword"> const</span>
<a name="l00030"></a>00030 <span class="keyword">                </span>{<span class="keywordflow">return</span> a^=b;}
<a name="l00031"></a>00031 
<a name="l00032"></a>00032         Element Inverse(Element a)<span class="keyword"> const</span>
<a name="l00033"></a>00033 <span class="keyword">                </span>{<span class="keywordflow">return</span> a;}
<a name="l00034"></a>00034 
<a name="l00035"></a>00035         Element Subtract(Element a, Element b)<span class="keyword"> const</span>
<a name="l00036"></a>00036 <span class="keyword">                </span>{<span class="keywordflow">return</span> a^b;}
<a name="l00037"></a>00037 
<a name="l00038"></a>00038         Element&amp; Reduce(Element &amp;a, Element b)<span class="keyword"> const</span>
<a name="l00039"></a>00039 <span class="keyword">                </span>{<span class="keywordflow">return</span> a^=b;}
<a name="l00040"></a>00040 
<a name="l00041"></a>00041         Element Double(Element a)<span class="keyword"> const</span>
<a name="l00042"></a>00042 <span class="keyword">                </span>{<span class="keywordflow">return</span> 0;}
<a name="l00043"></a>00043 
<a name="l00044"></a>00044         Element One()<span class="keyword"> const</span>
<a name="l00045"></a>00045 <span class="keyword">                </span>{<span class="keywordflow">return</span> 1;}
<a name="l00046"></a>00046 
<a name="l00047"></a>00047         Element Multiply(Element a, Element b) <span class="keyword">const</span>;
<a name="l00048"></a>00048 
<a name="l00049"></a>00049         Element <a class="code" href="class_square.html" title="Square">Square</a>(Element a)<span class="keyword"> const</span>
<a name="l00050"></a>00050 <span class="keyword">                </span>{<span class="keywordflow">return</span> Multiply(a, a);}
<a name="l00051"></a>00051 
<a name="l00052"></a>00052         <span class="keywordtype">bool</span> IsUnit(Element a)<span class="keyword"> const</span>
<a name="l00053"></a>00053 <span class="keyword">                </span>{<span class="keywordflow">return</span> a != 0;}
<a name="l00054"></a>00054 
<a name="l00055"></a>00055         Element MultiplicativeInverse(Element a) <span class="keyword">const</span>;
<a name="l00056"></a>00056 
<a name="l00057"></a>00057         Element Divide(Element a, Element b)<span class="keyword"> const</span>
<a name="l00058"></a>00058 <span class="keyword">                </span>{<span class="keywordflow">return</span> Multiply(a, MultiplicativeInverse(b));}
<a name="l00059"></a>00059 
<a name="l00060"></a>00060 <span class="keyword">private</span>:
<a name="l00061"></a>00061         word m_modulus;
<a name="l00062"></a>00062 };
<a name="l00063"></a>00063 
<a name="l00064"></a>00064 NAMESPACE_END
<a name="l00065"></a>00065 
<a name="l00066"></a>00066 <span class="preprocessor">#endif</span>
</pre></div></div>
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