gfpcrypt_8cpp-source.html

著名的密码库Crypto++的文档 C++语言的杰作。程序员必备。

<a name="l00182"></a>00182                 pg.<a class="code" href="class_prime_and_generator.html#86de2822923f884d0d4285d7e6a47015">Generate</a>(GetFieldType() == 1 ? 1 : -1, rng, modulusSize, subgroupOrderSize);
<a name="l00183"></a>00183                 p = pg.<a class="code" href="class_prime_and_generator.html#cb878f8b71f1260b6458c50ad87d592a">Prime</a>();
<a name="l00184"></a>00184                 q = pg.<a class="code" href="class_prime_and_generator.html#e2d1a2b6be1c325680c7cc6d1da399a3">SubPrime</a>();
<a name="l00185"></a>00185                 g = pg.<a class="code" href="class_prime_and_generator.html#00e94acffa91d09a711616c60ce2327e">Generator</a>();
<a name="l00186"></a>00186         }
<a name="l00187"></a>00187 
<a name="l00188"></a>00188         <a class="code" href="class_d_l___group_parameters___integer_based.html#c0a0277c8d9d397cc30722aac33ad1b6">Initialize</a>(p, q, g);
<a name="l00189"></a>00189 }
<a name="l00190"></a>00190 
<a name="l00191"></a><a class="code" href="class_d_l___group_parameters___integer_based.html#97a70418722f760768328239f569cfef">00191</a> <a class="code" href="class_integer.html" title="multiple precision integer and basic arithmetics">Integer</a> <a class="code" href="class_d_l___group_parameters___integer_based.html#97a70418722f760768328239f569cfef">DL_GroupParameters_IntegerBased::DecodeElement</a>(<span class="keyword">const</span> byte *encoded, <span class="keywordtype">bool</span> checkForGroupMembership)<span class="keyword"> const</span>
<a name="l00192"></a>00192 <span class="keyword"></span>{
<a name="l00193"></a>00193         <a class="code" href="class_integer.html" title="multiple precision integer and basic arithmetics">Integer</a> g(encoded, GetModulus().ByteCount());
<a name="l00194"></a>00194         <span class="keywordflow">if</span> (!<a class="code" href="class_d_l___group_parameters___integer_based.html#dce1f61e6d7556ecebdac14f0018adbf">ValidateElement</a>(1, g, NULL))
<a name="l00195"></a>00195                 <span class="keywordflow">throw</span> <a class="code" href="class_d_l___bad_element.html" title="to be thrown by DecodeElement and AgreeWithStaticPrivateKey">DL_BadElement</a>();
<a name="l00196"></a>00196         <span class="keywordflow">return</span> g;
<a name="l00197"></a>00197 }
<a name="l00198"></a>00198 
<a name="l00199"></a><a class="code" href="class_d_l___group_parameters___integer_based.html#9a13e3dd2da2b154d8296f306e2ee2a9">00199</a> <span class="keywordtype">void</span> <a class="code" href="class_d_l___group_parameters___integer_based.html#9a13e3dd2da2b154d8296f306e2ee2a9" title="decode this object from a BufferedTransformation, using BER (Basic Encoding Rules)...">DL_GroupParameters_IntegerBased::BERDecode</a>(<a class="code" href="class_buffered_transformation.html" title="interface for buffered transformations">BufferedTransformation</a> &amp;bt)
<a name="l00200"></a>00200 {
<a name="l00201"></a>00201         <a class="code" href="class_b_e_r_sequence_decoder.html" title="BER Sequence Decoder.">BERSequenceDecoder</a> parameters(bt);
<a name="l00202"></a>00202                 <a class="code" href="class_integer.html" title="multiple precision integer and basic arithmetics">Integer</a> p(parameters);
<a name="l00203"></a>00203                 <a class="code" href="class_integer.html" title="multiple precision integer and basic arithmetics">Integer</a> q(parameters);
<a name="l00204"></a>00204                 <a class="code" href="class_integer.html" title="multiple precision integer and basic arithmetics">Integer</a> g;
<a name="l00205"></a>00205                 <span class="keywordflow">if</span> (parameters.<a class="code" href="class_b_e_r_general_decoder.html#04f4fe90e88584b1cebffd32e149bfbc">EndReached</a>())
<a name="l00206"></a>00206                 {
<a name="l00207"></a>00207                         g = q;
<a name="l00208"></a>00208                         q = <a class="code" href="class_d_l___group_parameters___integer_based.html#05c2b65749d0357845599a7d434e3903">ComputeGroupOrder</a>(p) / 2;
<a name="l00209"></a>00209                 }
<a name="l00210"></a>00210                 <span class="keywordflow">else</span>
<a name="l00211"></a>00211                         g.<a class="code" href="class_integer.html#810fc0382f8928893fe192ab79b1972c">BERDecode</a>(parameters);
<a name="l00212"></a>00212         parameters.<a class="code" href="class_b_e_r_general_decoder.html#40b14625c98ac7febb8ca218d02358ad">MessageEnd</a>();
<a name="l00213"></a>00213 
<a name="l00214"></a>00214         SetModulusAndSubgroupGenerator(p, g);
<a name="l00215"></a>00215         <a class="code" href="class_d_l___group_parameters___integer_based.html#5a842eff8fb870a0c9a61831a9865342">SetSubgroupOrder</a>(q);
<a name="l00216"></a>00216 }
<a name="l00217"></a>00217 
<a name="l00218"></a><a class="code" href="class_d_l___group_parameters___integer_based.html#d1ae53e3f7253db8f7056a93e9d05e24">00218</a> <span class="keywordtype">void</span> <a class="code" href="class_d_l___group_parameters___integer_based.html#d1ae53e3f7253db8f7056a93e9d05e24" title="encode this object into a BufferedTransformation, using DER (Distinguished Encoding...">DL_GroupParameters_IntegerBased::DEREncode</a>(<a class="code" href="class_buffered_transformation.html" title="interface for buffered transformations">BufferedTransformation</a> &amp;bt)<span class="keyword"> const</span>
<a name="l00219"></a>00219 <span class="keyword"></span>{
<a name="l00220"></a>00220         <a class="code" href="class_d_e_r_sequence_encoder.html" title="DER Sequence Encoder.">DERSequenceEncoder</a> parameters(bt);
<a name="l00221"></a>00221                 GetModulus().<a class="code" href="class_integer.html#6ab51a05bee88cfa690179611e8a084e" title="encode using Distinguished Encoding Rules, put result into a BufferedTransformation...">DEREncode</a>(parameters);
<a name="l00222"></a>00222                 m_q.<a class="code" href="class_integer.html#6ab51a05bee88cfa690179611e8a084e" title="encode using Distinguished Encoding Rules, put result into a BufferedTransformation...">DEREncode</a>(parameters);
<a name="l00223"></a>00223                 <a class="code" href="class_d_l___group_parameters.html#8537f155cb10263bf7014ad676d1c70b">GetSubgroupGenerator</a>().<a class="code" href="class_integer.html#6ab51a05bee88cfa690179611e8a084e" title="encode using Distinguished Encoding Rules, put result into a BufferedTransformation...">DEREncode</a>(parameters);
<a name="l00224"></a>00224         parameters.<a class="code" href="class_d_e_r_general_encoder.html#cb5f1a94ba97027c603b019bd5228510">MessageEnd</a>();
<a name="l00225"></a>00225 }
<a name="l00226"></a>00226 
<a name="l00227"></a><a class="code" href="class_d_l___group_parameters___integer_based.html#d8a0f30e8440212bb20d3155b1d88463">00227</a> <span class="keywordtype">bool</span> <a class="code" href="class_d_l___group_parameters___integer_based.html#d8a0f30e8440212bb20d3155b1d88463" title="to be implemented by derived classes, users should use one of the above functions...">DL_GroupParameters_IntegerBased::GetVoidValue</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> *name, <span class="keyword">const</span> std::type_info &amp;valueType, <span class="keywordtype">void</span> *pValue)<span class="keyword"> const</span>
<a name="l00228"></a>00228 <span class="keyword"></span>{
<a name="l00229"></a>00229         <span class="keywordflow">return</span> GetValueHelper&lt;DL_GroupParameters&lt;Element&gt; &gt;(<span class="keyword">this</span>, name, valueType, pValue)
<a name="l00230"></a>00230                 CRYPTOPP_GET_FUNCTION_ENTRY(Modulus);
<a name="l00231"></a>00231 }
<a name="l00232"></a>00232 
<a name="l00233"></a><a class="code" href="class_d_l___group_parameters___integer_based.html#151a76c88372bdf98c68be2ad19400e1">00233</a> <span class="keywordtype">void</span> <a class="code" href="class_d_l___group_parameters___integer_based.html#151a76c88372bdf98c68be2ad19400e1" title="assign values from source to this object">DL_GroupParameters_IntegerBased::AssignFrom</a>(<span class="keyword">const</span> <a class="code" href="class_name_value_pairs.html" title="interface for retrieving values given their names">NameValuePairs</a> &amp;source)
<a name="l00234"></a>00234 {
<a name="l00235"></a>00235         AssignFromHelper(<span class="keyword">this</span>, source)
<a name="l00236"></a>00236                 CRYPTOPP_SET_FUNCTION_ENTRY2(Modulus, SubgroupGenerator)
<a name="l00237"></a>00237                 CRYPTOPP_SET_FUNCTION_ENTRY(SubgroupOrder)
<a name="l00238"></a>00238                 ;
<a name="l00239"></a>00239 }
<a name="l00240"></a>00240 
<a name="l00241"></a><a class="code" href="class_d_l___group_parameters___integer_based.html#4554246ef387b05e96b3b8e09c364918">00241</a> <a class="code" href="class_o_i_d.html" title="Object Identifier.">OID</a> <a class="code" href="class_d_l___group_parameters___integer_based.html#4554246ef387b05e96b3b8e09c364918">DL_GroupParameters_IntegerBased::GetAlgorithmID</a>()<span class="keyword"> const</span>
<a name="l00242"></a>00242 <span class="keyword"></span>{
<a name="l00243"></a>00243         <span class="keywordflow">return</span> ASN1::id_dsa();
<a name="l00244"></a>00244 }
<a name="l00245"></a>00245 
<a name="l00246"></a><a class="code" href="class_d_l___group_parameters___g_f_p.html#4c0256412b51e8587ec66f95253391d6">00246</a> <span class="keywordtype">void</span> <a class="code" href="class_d_l___group_parameters___g_f_p.html#4c0256412b51e8587ec66f95253391d6">DL_GroupParameters_GFP::SimultaneousExponentiate</a>(<a class="code" href="class_integer.html" title="multiple precision integer and basic arithmetics">Element</a> *results, <span class="keyword">const</span> <a class="code" href="class_integer.html" title="multiple precision integer and basic arithmetics">Element</a> &amp;base, <span class="keyword">const</span> <a class="code" href="class_integer.html" title="multiple precision integer and basic arithmetics">Integer</a> *exponents, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> exponentsCount)<span class="keyword"> const</span>
<a name="l00247"></a>00247 <span class="keyword"></span>{
<a name="l00248"></a>00248         <a class="code" href="class_modular_arithmetic.html" title="ring of congruence classes modulo n">ModularArithmetic</a> ma(<a class="code" href="class_d_l___group_parameters___integer_based_impl.html#2c3b85d7565e222bb5492ae7d141ec85">GetModulus</a>());
<a name="l00249"></a>00249         ma.<a class="code" href="class_modular_arithmetic.html#e37f29d8031840d185935819318f90dd">SimultaneousExponentiate</a>(results, base, exponents, exponentsCount);
<a name="l00250"></a>00250 }
<a name="l00251"></a>00251 
<a name="l00252"></a><a class="code" href="class_d_l___group_parameters___g_f_p.html#b2a40f7d901665a0ce5f3dddbdce7aa0">00252</a> <a class="code" href="class_integer.html" title="multiple precision integer and basic arithmetics">DL_GroupParameters_GFP::Element</a> <a class="code" href="class_d_l___group_parameters___g_f_p.html#b2a40f7d901665a0ce5f3dddbdce7aa0">DL_GroupParameters_GFP::MultiplyElements</a>(<span class="keyword">const</span> <a class="code" href="class_integer.html" title="multiple precision integer and basic arithmetics">Element</a> &amp;a, <span class="keyword">const</span> <a class="code" href="class_integer.html" title="multiple precision integer and basic arithmetics">Element</a> &amp;b)<span class="keyword"> const</span>
<a name="l00253"></a>00253 <span class="keyword"></span>{
<a name="l00254"></a>00254         <span class="keywordflow">return</span> a_times_b_mod_c(a, b, <a class="code" href="class_d_l___group_parameters___integer_based_impl.html#2c3b85d7565e222bb5492ae7d141ec85">GetModulus</a>());
<a name="l00255"></a>00255 }
<a name="l00256"></a>00256 
<a name="l00257"></a><a class="code" href="class_d_l___group_parameters___g_f_p.html#fbdd64843d27a5393d82041773066e1c">00257</a> <a class="code" href="class_integer.html" title="multiple precision integer and basic arithmetics">DL_GroupParameters_GFP::Element</a> <a class="code" href="class_d_l___group_parameters___g_f_p.html#fbdd64843d27a5393d82041773066e1c">DL_GroupParameters_GFP::CascadeExponentiate</a>(<span class="keyword">const</span> <a class="code" href="class_integer.html" title="multiple precision integer and basic arithmetics">Element</a> &amp;element1, <span class="keyword">const</span> <a class="code" href="class_integer.html" title="multiple precision integer and basic arithmetics">Integer</a> &amp;exponent1, <span class="keyword">const</span> <a class="code" href="class_integer.html" title="multiple precision integer and basic arithmetics">Element</a> &amp;element2, <span class="keyword">const</span> <a class="code" href="class_integer.html" title="multiple precision integer and basic arithmetics">Integer</a> &amp;exponent2)<span class="keyword"> const</span>
<a name="l00258"></a>00258 <span class="keyword"></span>{
<a name="l00259"></a>00259         <a class="code" href="class_modular_arithmetic.html" title="ring of congruence classes modulo n">ModularArithmetic</a> ma(<a class="code" href="class_d_l___group_parameters___integer_based_impl.html#2c3b85d7565e222bb5492ae7d141ec85">GetModulus</a>());
<a name="l00260"></a>00260         <span class="keywordflow">return</span> ma.<a class="code" href="class_modular_arithmetic.html#39c4f7a3fb501adc8d96145aecfb63f0">CascadeExponentiate</a>(element1, exponent1, element2, exponent2);
<a name="l00261"></a>00261 }
<a name="l00262"></a>00262 
<a name="l00263"></a><a class="code" href="class_d_l___group_parameters___integer_based.html#578245e653f2d82a084a3c8a32ccdea5">00263</a> <a class="code" href="class_integer.html" title="multiple precision integer and basic arithmetics">Integer</a> <a class="code" href="class_d_l___group_parameters___integer_based.html#578245e653f2d82a084a3c8a32ccdea5">DL_GroupParameters_IntegerBased::GetMaxExponent</a>()<span class="keyword"> const</span>
<a name="l00264"></a>00264 <span class="keyword"></span>{
<a name="l00265"></a>00265         <span class="keywordflow">return</span> STDMIN(<a class="code" href="class_d_l___group_parameters___integer_based.html#e6eb7fd2937f5eee9740d0db173f0475">GetSubgroupOrder</a>()-1, <a class="code" href="class_integer.html#de53248f5dbb520273a70856b975417c" title="return the integer 2**e">Integer::Power2</a>(2*DiscreteLogWorkFactor(GetFieldType()*GetModulus().BitCount())));
<a name="l00266"></a>00266 }
<a name="l00267"></a>00267 
<a name="l00268"></a><a class="code" href="class_d_l___group_parameters___integer_based.html#91dcd7ec2cad65152b863522144351bd">00268</a> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code" href="class_d_l___group_parameters___integer_based.html#91dcd7ec2cad65152b863522144351bd">DL_GroupParameters_IntegerBased::GetDefaultSubgroupOrderSize</a>(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> modulusSize)<span class="keyword"> const</span>
<a name="l00269"></a>00269 <span class="keyword"></span>{
<a name="l00270"></a>00270         <span class="keywordflow">return</span> 2*DiscreteLogWorkFactor(GetFieldType()*modulusSize);
<a name="l00271"></a>00271 }
<a name="l00272"></a>00272 
<a name="l00273"></a>00273 NAMESPACE_END
<a name="l00274"></a>00274 
<a name="l00275"></a>00275 <span class="preprocessor">#endif</span>
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