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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="blumshub_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">// blumshub.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 blumshub.h</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">/// \brief Classes for Blum Blum Shub generator</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_BLUMSHUB_H</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="preprocessor">#define CRYPTOPP_BLUMSHUB_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="modarith_8h.html">modarith.h</a>"</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#include "<a class="code" href="integer_8h.html">integer.h</a>"</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> </div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> NAMESPACE_BEGIN(<a class="code" href="namespace_crypto_p_p.html">CryptoPP</a>)</div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> </div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment">/// BlumBlumShub without factorization of the modulus</span></div><div class="line"><a name="l00016"></a><span class="lineno"><a class="line" href="class_public_blum_blum_shub.html"> 16</a></span> <span class="comment"></span>class <a class="code" href="class_public_blum_blum_shub.html">PublicBlumBlumShub</a> : public <a class="code" href="class_random_number_generator.html">RandomNumberGenerator</a>,</div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span>  public <a class="code" href="class_stream_transformation.html">StreamTransformation</a></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> {</div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="keyword">public</span>:</div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span>  <span class="keyword">virtual</span> ~<a class="code" href="class_public_blum_blum_shub.html">PublicBlumBlumShub</a>() {}</div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> </div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  <a class="code" href="class_public_blum_blum_shub.html">PublicBlumBlumShub</a>(<span class="keyword">const</span> <a class="code" href="class_integer.html">Integer</a> &n, <span class="keyword">const</span> <a class="code" href="class_integer.html">Integer</a> &seed);</div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> </div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> GenerateBit();</div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  <span class="keywordtype">byte</span> GenerateByte();</div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  <span class="keywordtype">void</span> GenerateBlock(<span class="keywordtype">byte</span> *output, <span class="keywordtype">size_t</span> size);</div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  <span class="keywordtype">void</span> ProcessData(<span class="keywordtype">byte</span> *outString, <span class="keyword">const</span> <span class="keywordtype">byte</span> *inString, <span class="keywordtype">size_t</span> length);</div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> </div><div class="line"><a name="l00029"></a><span class="lineno"><a class="line" href="class_public_blum_blum_shub.html#ac322c5980509bc4e8075f28c4425ac3f"> 29</a></span>  <span class="keywordtype">bool</span> <a class="code" href="class_public_blum_blum_shub.html#ac322c5980509bc4e8075f28c4425ac3f">IsSelfInverting</a>()<span class="keyword"> const </span>{<span class="keywordflow">return</span> <span class="keyword">true</span>;}</div><div class="line"><a name="l00030"></a><span class="lineno"><a class="line" href="class_public_blum_blum_shub.html#a0ad21fce7f3113ab25ea05e47773a786"> 30</a></span>  <span class="keywordtype">bool</span> <a class="code" href="class_public_blum_blum_shub.html#a0ad21fce7f3113ab25ea05e47773a786">IsForwardTransformation</a>()<span class="keyword"> const </span>{<span class="keywordflow">return</span> <span class="keyword">true</span>;}</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> <span class="keyword">protected</span>:</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  <a class="code" href="class_modular_arithmetic.html">ModularArithmetic</a> modn;</div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <a class="code" href="class_integer.html">Integer</a> current;</div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  word maxBits, bitsLeft;</div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> };</div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment"></span></div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment">/// BlumBlumShub with factorization of the modulus</span></div><div class="line"><a name="l00039"></a><span class="lineno"><a class="line" href="class_blum_blum_shub.html"> 39</a></span> <span class="comment"></span><span class="keyword">class </span><a class="code" href="class_blum_blum_shub.html">BlumBlumShub</a> : <span class="keyword">public</span> <a class="code" href="class_public_blum_blum_shub.html">PublicBlumBlumShub</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> <span class="keyword">public</span>:</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="keyword">virtual</span> ~<a class="code" href="class_blum_blum_shub.html">BlumBlumShub</a>() {}</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>  <span class="comment">// Make sure p and q are both primes congruent to 3 mod 4 and at least 512 bits long,</span></div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="comment">// seed is the secret key and should be about as big as p*q</span></div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <a class="code" href="class_blum_blum_shub.html">BlumBlumShub</a>(<span class="keyword">const</span> <a class="code" href="class_integer.html">Integer</a> &p, <span class="keyword">const</span> <a class="code" href="class_integer.html">Integer</a> &q, <span class="keyword">const</span> <a class="code" href="class_integer.html">Integer</a> &seed);</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span> </div><div class="line"><a name="l00048"></a><span class="lineno"><a class="line" href="class_blum_blum_shub.html#adca1fd77ec8f237fa8eeaf6fb22a6412"> 48</a></span>  <span class="keywordtype">bool</span> <a class="code" href="class_blum_blum_shub.html#adca1fd77ec8f237fa8eeaf6fb22a6412">IsRandomAccess</a>()<span class="keyword"> const </span>{<span class="keywordflow">return</span> <span class="keyword">true</span>;}</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="keywordtype">void</span> <a class="code" href="class_blum_blum_shub.html#ae29af38d625e72bc5e503db157a84c5f">Seek</a>(lword index);</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> </div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="keyword">protected</span>:</div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="keyword">const</span> <a class="code" href="class_integer.html">Integer</a> p, q;</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keyword">const</span> <a class="code" href="class_integer.html">Integer</a> x0;</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> </div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span> NAMESPACE_END</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="preprocessor">#endif</span></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_blum_blum_shub_html_ae29af38d625e72bc5e503db157a84c5f"><div class="ttname"><a href="class_blum_blum_shub.html#ae29af38d625e72bc5e503db157a84c5f">BlumBlumShub::Seek</a></div><div class="ttdeci">void Seek(lword index)</div><div class="ttdoc">Seek to an absolute position.</div><div class="ttdef"><b>Definition:</b> <a href="blumshub_8cpp_source.html#l00055">blumshub.cpp:55</a></div></div>
<div class="ttc" id="class_modular_arithmetic_html"><div class="ttname"><a href="class_modular_arithmetic.html">ModularArithmetic</a></div><div class="ttdoc">Ring of congruence classes modulo n.</div><div class="ttdef"><b>Definition:</b> <a href="modarith_8h_source.html#l00038">modarith.h:38</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_public_blum_blum_shub_html_ac322c5980509bc4e8075f28c4425ac3f"><div class="ttname"><a href="class_public_blum_blum_shub.html#ac322c5980509bc4e8075f28c4425ac3f">PublicBlumBlumShub::IsSelfInverting</a></div><div class="ttdeci">bool IsSelfInverting() const</div><div class="ttdoc">Determines whether the cipher is self-inverting.</div><div class="ttdef"><b>Definition:</b> <a href="blumshub_8h_source.html#l00029">blumshub.h:29</a></div></div>
<div class="ttc" id="class_public_blum_blum_shub_html_a0ad21fce7f3113ab25ea05e47773a786"><div class="ttname"><a href="class_public_blum_blum_shub.html#a0ad21fce7f3113ab25ea05e47773a786">PublicBlumBlumShub::IsForwardTransformation</a></div><div class="ttdeci">bool IsForwardTransformation() const</div><div class="ttdoc">Determines if the cipher is being operated in its forward direction.</div><div class="ttdef"><b>Definition:</b> <a href="blumshub_8h_source.html#l00030">blumshub.h:30</a></div></div>
<div class="ttc" id="class_integer_html"><div class="ttname"><a href="class_integer.html">Integer</a></div><div class="ttdoc">Multiple precision integer with arithmetic operations.</div><div class="ttdef"><b>Definition:</b> <a href="integer_8h_source.html#l00049">integer.h:49</a></div></div>
<div class="ttc" id="class_stream_transformation_html"><div class="ttname"><a href="class_stream_transformation.html">StreamTransformation</a></div><div class="ttdoc">Interface for the data processing portion of stream ciphers.</div><div class="ttdef"><b>Definition:</b> <a href="cryptlib_8h_source.html#l00898">cryptlib.h:898</a></div></div>
<div class="ttc" id="class_blum_blum_shub_html"><div class="ttname"><a href="class_blum_blum_shub.html">BlumBlumShub</a></div><div class="ttdoc">BlumBlumShub with factorization of the modulus.</div><div class="ttdef"><b>Definition:</b> <a href="blumshub_8h_source.html#l00039">blumshub.h:39</a></div></div>
<div class="ttc" id="integer_8h_html"><div class="ttname"><a href="integer_8h.html">integer.h</a></div><div class="ttdoc">Multiple precision integer with arithmetic operations.</div></div>
<div class="ttc" id="modarith_8h_html"><div class="ttname"><a href="modarith_8h.html">modarith.h</a></div><div class="ttdoc">Class file for performing modular arithmetic.</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>
<div class="ttc" id="class_public_blum_blum_shub_html"><div class="ttname"><a href="class_public_blum_blum_shub.html">PublicBlumBlumShub</a></div><div class="ttdoc">BlumBlumShub without factorization of the modulus.</div><div class="ttdef"><b>Definition:</b> <a href="blumshub_8h_source.html#l00016">blumshub.h:16</a></div></div>
<div class="ttc" id="class_blum_blum_shub_html_adca1fd77ec8f237fa8eeaf6fb22a6412"><div class="ttname"><a href="class_blum_blum_shub.html#adca1fd77ec8f237fa8eeaf6fb22a6412">BlumBlumShub::IsRandomAccess</a></div><div class="ttdeci">bool IsRandomAccess() const</div><div class="ttdoc">Determines whether the cipher supports random access.</div><div class="ttdef"><b>Definition:</b> <a href="blumshub_8h_source.html#l00048">blumshub.h:48</a></div></div>
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