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 <span id="projectnumber">7.0</span>
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<div class="title">dh2.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">// dh2.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="cryptlib_8h.html">cryptlib.h</a>"</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="preprocessor">#include "<a class="code" href="misc_8h.html">misc.h</a>"</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="preprocessor">#include "<a class="code" href="dh2_8h.html">dh2.h</a>"</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> </div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> NAMESPACE_BEGIN(<a class="code" href="namespace_crypto_p_p.html">CryptoPP</a>)</div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> </div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor">#if defined(CRYPTOPP_DEBUG) && !defined(CRYPTOPP_DOXYGEN_PROCESSING)</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="keyword">struct </span>NullCryptoParameters : <span class="keyword">public</span> <a class="code" href="class_crypto_parameters.html">CryptoParameters</a></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>  <span class="keywordtype">void</span> <a class="code" href="class_crypto_material.html#a20181c1b39a74a9fe91385b025b773c6">AssignFrom</a>(<span class="keyword">const</span> <a class="code" href="class_name_value_pairs.html">NameValuePairs</a> &source) {</div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span>  CRYPTOPP_UNUSED(source);</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>  <span class="keywordtype">bool</span> <a class="code" href="class_crypto_material.html#aaa7d67d0c12712de0e33713c73f5b718">Validate</a>(<a class="code" href="class_random_number_generator.html">RandomNumberGenerator</a> &rng, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> level)<span class="keyword"> const </span>{</div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span>  CRYPTOPP_UNUSED(rng); CRYPTOPP_UNUSED(level);</div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  }</div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span>  <span class="keywordtype">bool</span> <a class="code" href="class_name_value_pairs.html#a9fc3f5c4480d53b8104c67ca7958e332">GetVoidValue</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> *name, <span class="keyword">const</span> std::type_info &valueType, <span class="keywordtype">void</span> *pValue)<span class="keyword"> const </span>{</div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  CRYPTOPP_UNUSED(name); CRYPTOPP_UNUSED(valueType); CRYPTOPP_UNUSED(pValue);</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</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> </div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="keyword">struct </span>NullSimpleKeyAgreementDomain : <span class="keyword">public</span> TwoBases<NullCryptoParameters, SimpleKeyAgreementDomain></div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> {</div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  <a class="code" href="class_crypto_parameters.html">CryptoParameters</a> & AccessCryptoParameters() {</div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  }</div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> AgreedValueLength()<span class="keyword"> const </span>{</div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  <span class="keywordflow">return</span> 1;</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  }</div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> PrivateKeyLength()<span class="keyword"> const </span>{</div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <span class="keywordflow">return</span> 1;</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="keywordtype">unsigned</span> <span class="keywordtype">int</span> PublicKeyLength()<span class="keyword"> const </span>{</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="keywordflow">return</span> 1;</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  }</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="keywordtype">void</span> GeneratePrivateKey(<a class="code" href="class_random_number_generator.html">RandomNumberGenerator</a> &rng, <span class="keywordtype">byte</span> *privateKey)<span class="keyword"> const </span>{</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  CRYPTOPP_UNUSED(rng); CRYPTOPP_UNUSED(privateKey);</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  }</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="keywordtype">void</span> GeneratePublicKey(<a class="code" href="class_random_number_generator.html">RandomNumberGenerator</a> &rng, <span class="keyword">const</span> <span class="keywordtype">byte</span> *privateKey, <span class="keywordtype">byte</span> *publicKey)<span class="keyword"> const </span>{</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  CRYPTOPP_UNUSED(rng); CRYPTOPP_UNUSED(privateKey); CRYPTOPP_UNUSED(publicKey);</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  }</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="keywordtype">bool</span> Agree(<span class="keywordtype">byte</span> *agreedValue, <span class="keyword">const</span> <span class="keywordtype">byte</span> *privateKey, <span class="keyword">const</span> <span class="keywordtype">byte</span> *otherPublicKey, <span class="keywordtype">bool</span> validateOtherPublicKey=<span class="keyword">true</span>)<span class="keyword"> const </span>{</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  CRYPTOPP_UNUSED(agreedValue); CRYPTOPP_UNUSED(privateKey);</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  CRYPTOPP_UNUSED(otherPublicKey); CRYPTOPP_UNUSED(validateOtherPublicKey);</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</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> };</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> <span class="keywordtype">void</span> DH2_TestInstantiations()</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>  NullSimpleKeyAgreementDomain dom;</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <a class="code" href="class_d_h2.html">DH2</a> dh(dom);</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="line"><a name="l00059"></a><span class="lineno"> 59</span> </div><div class="line"><a name="l00060"></a><span class="lineno"><a class="line" href="class_d_h2.html#a792d681ae9a94f4a15f27efefcc172dc"> 60</a></span> <span class="keywordtype">bool</span> <a class="code" href="class_d_h2.html#a792d681ae9a94f4a15f27efefcc172dc">DH2::Agree</a>(<span class="keywordtype">byte</span> *agreedValue,</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keyword">const</span> <span class="keywordtype">byte</span> *staticSecretKey, <span class="keyword">const</span> <span class="keywordtype">byte</span> *ephemeralSecretKey,</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="keyword">const</span> <span class="keywordtype">byte</span> *staticOtherPublicKey, <span class="keyword">const</span> <span class="keywordtype">byte</span> *ephemeralOtherPublicKey,</div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keywordtype">bool</span> validateStaticOtherPublicKey)<span class="keyword"> const</span></div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="keyword"></span>{</div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keywordflow">return</span> d1.<a class="code" href="class_simple_key_agreement_domain.html#a732339ca730408cca7b1191fc32eb39e">Agree</a>(agreedValue, staticSecretKey, staticOtherPublicKey, validateStaticOtherPublicKey)</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  && d2.<a class="code" href="class_simple_key_agreement_domain.html#a732339ca730408cca7b1191fc32eb39e">Agree</a>(agreedValue+d1.<a class="code" href="class_simple_key_agreement_domain.html#aedb873e4aa6fc15ac5245b7af04e4946">AgreedValueLength</a>(), ephemeralSecretKey, ephemeralOtherPublicKey, <span class="keyword">true</span>);</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span> }</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> NAMESPACE_END</div><div class="ttc" id="class_crypto_material_html_a20181c1b39a74a9fe91385b025b773c6"><div class="ttname"><a href="class_crypto_material.html#a20181c1b39a74a9fe91385b025b773c6">CryptoMaterial::AssignFrom</a></div><div class="ttdeci">virtual void AssignFrom(const NameValuePairs &source)=0</div><div class="ttdoc">Assign values to this object.</div></div>
<div class="ttc" id="dh2_8h_html"><div class="ttname"><a href="dh2_8h.html">dh2.h</a></div><div class="ttdoc">Classes for Unified Diffie-Hellman key exchange.</div></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="class_simple_key_agreement_domain_html_aedb873e4aa6fc15ac5245b7af04e4946"><div class="ttname"><a href="class_simple_key_agreement_domain.html#aedb873e4aa6fc15ac5245b7af04e4946">SimpleKeyAgreementDomain::AgreedValueLength</a></div><div class="ttdeci">virtual unsigned int AgreedValueLength() const =0</div><div class="ttdoc">Provides the size of the agreed value.</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_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_crypto_material_html_aaa7d67d0c12712de0e33713c73f5b718"><div class="ttname"><a href="class_crypto_material.html#aaa7d67d0c12712de0e33713c73f5b718">CryptoMaterial::Validate</a></div><div class="ttdeci">virtual bool Validate(RandomNumberGenerator &rng, unsigned int level) const =0</div><div class="ttdoc">Check this object for errors.</div></div>
<div class="ttc" id="class_d_h2_html_a792d681ae9a94f4a15f27efefcc172dc"><div class="ttname"><a href="class_d_h2.html#a792d681ae9a94f4a15f27efefcc172dc">DH2::Agree</a></div><div class="ttdeci">bool Agree(byte *agreedValue, const byte *staticPrivateKey, const byte *ephemeralPrivateKey, const byte *staticOtherPublicKey, const byte *ephemeralOtherPublicKey, bool validateStaticOtherPublicKey=true) const</div><div class="ttdoc">Derive agreed value.</div><div class="ttdef"><b>Definition:</b> <a href="dh2_8cpp_source.html#l00060">dh2.cpp:60</a></div></div>
<div class="ttc" id="class_d_h2_html"><div class="ttname"><a href="class_d_h2.html">DH2</a></div><div class="ttdoc">Unified Diffie-Hellman in GF(p)</div><div class="ttdef"><b>Definition:</b> <a href="dh2_8h_source.html#l00020">dh2.h:20</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="class_name_value_pairs_html_a9fc3f5c4480d53b8104c67ca7958e332"><div class="ttname"><a href="class_name_value_pairs.html#a9fc3f5c4480d53b8104c67ca7958e332">NameValuePairs::GetVoidValue</a></div><div class="ttdeci">virtual bool GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const =0</div><div class="ttdoc">Get a named value.</div></div>
<div class="ttc" id="class_simple_key_agreement_domain_html_a732339ca730408cca7b1191fc32eb39e"><div class="ttname"><a href="class_simple_key_agreement_domain.html#a732339ca730408cca7b1191fc32eb39e">SimpleKeyAgreementDomain::Agree</a></div><div class="ttdeci">virtual bool Agree(byte *agreedValue, const byte *privateKey, const byte *otherPublicKey, bool validateOtherPublicKey=true) const =0</div><div class="ttdoc">Derive agreed value.</div></div>
<div class="ttc" id="class_crypto_parameters_html"><div class="ttname"><a href="class_crypto_parameters.html">CryptoParameters</a></div><div class="ttdoc">Interface for crypto prameters.</div><div class="ttdef"><b>Definition:</b> <a href="cryptlib_8h_source.html#l02379">cryptlib.h:2379</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>
<div class="ttc" id="class_name_value_pairs_html"><div class="ttname"><a href="class_name_value_pairs.html">NameValuePairs</a></div><div class="ttdoc">Interface for retrieving values given their names.</div><div class="ttdef"><b>Definition:</b> <a href="cryptlib_8h_source.html#l00290">cryptlib.h:290</a></div></div>
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