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<div class="title">blumshub.cpp</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// blumshub.cpp - 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> </div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="preprocessor">#include "<a class="code" href="pch_8h.html">pch.h</a>"</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="preprocessor">#include "<a class="code" href="blumshub_8h.html">blumshub.h</a>"</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="preprocessor">#include "<a class="code" href="integer_8h.html">integer.h</a>"</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> </div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> NAMESPACE_BEGIN(<a class="code" href="namespace_crypto_p_p.html">CryptoPP</a>)</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> PublicBlumBlumShub::PublicBlumBlumShub(<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="l00010"></a><span class="lineno"> 10</span>  : modn(n),</div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span>  current(modn.<a class="code" href="class_square.html">Square</a>(modn.<a class="code" href="class_square.html">Square</a>(seed))),</div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span>  maxBits(<a class="code" href="misc_8h.html#a3c5964768bc94670ad2bc3f218d9367f">BitPrecision</a>(n.BitCount())-1),</div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span>  bitsLeft(maxBits)</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> }</div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> </div><div class="line"><a name="l00017"></a><span class="lineno"><a class="line" href="class_public_blum_blum_shub.html#a6871d5e2ba162f32574d6b43e2473286"> 17</a></span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code" href="class_public_blum_blum_shub.html#a6871d5e2ba162f32574d6b43e2473286">PublicBlumBlumShub::GenerateBit</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="keywordflow">if</span> (bitsLeft==0)</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>  current = modn.<a class="code" href="class_modular_arithmetic.html#a7f74883ad789f0db51ed9b45385c14db">Square</a>(current);</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  bitsLeft = maxBits;</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> </div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  <span class="keywordflow">return</span> static_cast<unsigned int>(current.<a class="code" href="class_integer.html#a0e377d23bde55fc7dc6ea2208c587d19">GetBit</a>(--bitsLeft));</div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> }</div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> </div><div class="line"><a name="l00028"></a><span class="lineno"><a class="line" href="class_public_blum_blum_shub.html#aaeb3ba6a07fe0a67d35c4fb84bfc71cf"> 28</a></span> <span class="keywordtype">byte</span> <a class="code" href="class_public_blum_blum_shub.html#aaeb3ba6a07fe0a67d35c4fb84bfc71cf">PublicBlumBlumShub::GenerateByte</a>()</div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> {</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  <span class="keywordtype">byte</span> b=0;</div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i=0; i<8; i++)</div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  b = <span class="keywordtype">byte</span>((b << 1) | <a class="code" href="class_public_blum_blum_shub.html#a6871d5e2ba162f32574d6b43e2473286">PublicBlumBlumShub::GenerateBit</a>());</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  <span class="keywordflow">return</span> 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> </div><div class="line"><a name="l00036"></a><span class="lineno"><a class="line" href="class_public_blum_blum_shub.html#a8301fb046b5954854ec9635ae16f615b"> 36</a></span> <span class="keywordtype">void</span> <a class="code" href="class_public_blum_blum_shub.html#a8301fb046b5954854ec9635ae16f615b">PublicBlumBlumShub::GenerateBlock</a>(<span class="keywordtype">byte</span> *output, <span class="keywordtype">size_t</span> size)</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>  <span class="keywordflow">while</span> (size--)</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  *output++ = <a class="code" href="class_public_blum_blum_shub.html#aaeb3ba6a07fe0a67d35c4fb84bfc71cf">PublicBlumBlumShub::GenerateByte</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> </div><div class="line"><a name="l00042"></a><span class="lineno"><a class="line" href="class_public_blum_blum_shub.html#afb03a58653cb83c9a9013f3a57105bfc"> 42</a></span> <span class="keywordtype">void</span> <a class="code" href="class_public_blum_blum_shub.html#afb03a58653cb83c9a9013f3a57105bfc">PublicBlumBlumShub::ProcessData</a>(<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="l00043"></a><span class="lineno"> 43</span> {</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="keywordflow">while</span> (length--)</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  *outString++ = *inString++ ^ <a class="code" href="class_public_blum_blum_shub.html#aaeb3ba6a07fe0a67d35c4fb84bfc71cf">PublicBlumBlumShub::GenerateByte</a>();</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> </div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> BlumBlumShub::BlumBlumShub(<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="l00049"></a><span class="lineno"> 49</span>  : <a class="code" href="class_public_blum_blum_shub.html">PublicBlumBlumShub</a>(p*q, seed),</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  p(p), q(q),</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  x0(modn.<a class="code" href="class_square.html">Square</a>(seed))</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> }</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span> </div><div class="line"><a name="l00055"></a><span class="lineno"><a class="line" href="class_blum_blum_shub.html#ae29af38d625e72bc5e503db157a84c5f"> 55</a></span> <span class="keywordtype">void</span> <a class="code" href="class_blum_blum_shub.html#ae29af38d625e72bc5e503db157a84c5f">BlumBlumShub::Seek</a>(lword index)</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span> {</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <a class="code" href="class_integer.html">Integer</a> i(<a class="code" href="class_integer.html#ae0d4d9975fb6ab7667aab6f7ab8612d2ad10299fe0b190d3de927db776b8dc42d">Integer::POSITIVE</a>, index);</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  i *= 8;</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <a class="code" href="class_integer.html">Integer</a> e = a_exp_b_mod_c (2, i / maxBits + 1, (p-1)*(q-1));</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  current = modn.Exponentiate(x0, e);</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  bitsLeft = maxBits - i % maxBits;</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> </div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span> NAMESPACE_END</div><div class="ttc" id="class_modular_arithmetic_html_a7f74883ad789f0db51ed9b45385c14db"><div class="ttname"><a href="class_modular_arithmetic.html#a7f74883ad789f0db51ed9b45385c14db">ModularArithmetic::Square</a></div><div class="ttdeci">const Integer & Square(const Integer &a) const</div><div class="ttdoc">Square an element in the ring.</div><div class="ttdef"><b>Definition:</b> <a href="modarith_8h_source.html#l00181">modarith.h:181</a></div></div>
<div class="ttc" id="class_public_blum_blum_shub_html_afb03a58653cb83c9a9013f3a57105bfc"><div class="ttname"><a href="class_public_blum_blum_shub.html#afb03a58653cb83c9a9013f3a57105bfc">PublicBlumBlumShub::ProcessData</a></div><div class="ttdeci">void ProcessData(byte *outString, const byte *inString, size_t length)</div><div class="ttdoc">Encrypt or decrypt an array of bytes.</div><div class="ttdef"><b>Definition:</b> <a href="blumshub_8cpp_source.html#l00042">blumshub.cpp:42</a></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_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_public_blum_blum_shub_html_a6871d5e2ba162f32574d6b43e2473286"><div class="ttname"><a href="class_public_blum_blum_shub.html#a6871d5e2ba162f32574d6b43e2473286">PublicBlumBlumShub::GenerateBit</a></div><div class="ttdeci">unsigned int GenerateBit()</div><div class="ttdoc">Generate new random bit and return it.</div><div class="ttdef"><b>Definition:</b> <a href="blumshub_8cpp_source.html#l00017">blumshub.cpp:17</a></div></div>
<div class="ttc" id="class_public_blum_blum_shub_html_aaeb3ba6a07fe0a67d35c4fb84bfc71cf"><div class="ttname"><a href="class_public_blum_blum_shub.html#aaeb3ba6a07fe0a67d35c4fb84bfc71cf">PublicBlumBlumShub::GenerateByte</a></div><div class="ttdeci">byte GenerateByte()</div><div class="ttdoc">Generate new random byte and return it.</div><div class="ttdef"><b>Definition:</b> <a href="blumshub_8cpp_source.html#l00028">blumshub.cpp:28</a></div></div>
<div class="ttc" id="class_public_blum_blum_shub_html_a8301fb046b5954854ec9635ae16f615b"><div class="ttname"><a href="class_public_blum_blum_shub.html#a8301fb046b5954854ec9635ae16f615b">PublicBlumBlumShub::GenerateBlock</a></div><div class="ttdeci">void GenerateBlock(byte *output, size_t size)</div><div class="ttdoc">Generate random array of bytes.</div><div class="ttdef"><b>Definition:</b> <a href="blumshub_8cpp_source.html#l00036">blumshub.cpp:36</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="pch_8h_html"><div class="ttname"><a href="pch_8h.html">pch.h</a></div><div class="ttdoc">Precompiled header file.</div></div>
<div class="ttc" id="blumshub_8h_html"><div class="ttname"><a href="blumshub_8h.html">blumshub.h</a></div><div class="ttdoc">Classes for Blum Blum Shub generator.</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="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_integer_html_a0e377d23bde55fc7dc6ea2208c587d19"><div class="ttname"><a href="class_integer.html#a0e377d23bde55fc7dc6ea2208c587d19">Integer::GetBit</a></div><div class="ttdeci">bool GetBit(size_t i) const</div><div class="ttdoc">Provides the i-th bit of the Integer.</div><div class="ttdef"><b>Definition:</b> <a href="integer_8cpp_source.html#l03079">integer.cpp:3079</a></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="misc_8h_html_a3c5964768bc94670ad2bc3f218d9367f"><div class="ttname"><a href="misc_8h.html#a3c5964768bc94670ad2bc3f218d9367f">BitPrecision</a></div><div class="ttdeci">unsigned int BitPrecision(const T &value)</div><div class="ttdoc">Returns the number of bits required for a value.</div><div class="ttdef"><b>Definition:</b> <a href="misc_8h_source.html#l00694">misc.h:694</a></div></div>
<div class="ttc" id="class_integer_html_ae0d4d9975fb6ab7667aab6f7ab8612d2ad10299fe0b190d3de927db776b8dc42d"><div class="ttname"><a href="class_integer.html#ae0d4d9975fb6ab7667aab6f7ab8612d2ad10299fe0b190d3de927db776b8dc42d">Integer::POSITIVE</a></div><div class="ttdoc">the value is positive or 0</div><div class="ttdef"><b>Definition:</b> <a href="integer_8h_source.html#l00075">integer.h:75</a></div></div>
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