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Crypto++是一个非常强大的密码学库,主要是功能全

00387         m_n.Decode(ssN, ssN.<a class="code" href="class_buffered_transformation.html#_zlib_decompressorz7_0">MaxRetrievable</a>());
00388         m_k = param.h;
00389 }
00390 
00391 <span class="keyword">template</span> &lt;<span class="keyword">class</span> EC&gt;
<a name="l00392"></a><a class="code" href="class_d_l___group_parameters___e_c.html#_d_l___group_parameters___e_ca6">00392</a> <span class="keywordtype">bool</span> <a class="code" href="class_d_l___group_parameters___e_c.html#_d_l___group_parameters___e_ca6">DL_GroupParameters_EC&lt;EC&gt;::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>
00393 <span class="keyword"></span>{
00394         <span class="keywordflow">if</span> (strcmp(name, Name::GroupOID()) == 0)
00395         {
00396                 <span class="keywordflow">if</span> (m_oid.<a class="code" href="class_o_i_d.html#_o_i_do0">m_values</a>.empty())
00397                         <span class="keywordflow">return</span> <span class="keyword">false</span>;
00398 
00399                 <a class="code" href="class_name_value_pairs.html#_x_t_r___d_he0">ThrowIfTypeMismatch</a>(name, <span class="keyword">typeid</span>(OID), valueType);
00400                 *reinterpret_cast&lt;OID *&gt;(pValue) = m_oid;
00401                 <span class="keywordflow">return</span> <span class="keyword">true</span>;
00402         }
00403         <span class="keywordflow">else</span>
00404                 <span class="keywordflow">return</span> GetValueHelper&lt;DL_GroupParameters&lt;Element&gt; &gt;(<span class="keyword">this</span>, name, valueType, pValue).Assignable()
00405                         CRYPTOPP_GET_FUNCTION_ENTRY(<a class="code" href="namespace_name.html#a22">Curve</a>);
00406 }
00407 
00408 <span class="keyword">template</span> &lt;<span class="keyword">class</span> EC&gt;
<a name="l00409"></a><a class="code" href="class_d_l___group_parameters___e_c.html#_d_l___group_parameters___e_ca7">00409</a> <span class="keywordtype">void</span> <a class="code" href="class_d_l___group_parameters___e_c.html#_d_l___group_parameters___e_ca7">DL_GroupParameters_EC&lt;EC&gt;::AssignFrom</a>(<span class="keyword">const</span> <a class="code" href="class_name_value_pairs.html">NameValuePairs</a> &amp;source)
00410 {
00411         OID oid;
00412         <span class="keywordflow">if</span> (source.<a class="code" href="class_name_value_pairs.html#_x_t_r___d_ha39">GetValue</a>(Name::GroupOID(), oid))
00413                 Initialize(oid);
00414         <span class="keywordflow">else</span>
00415         {
00416                 EllipticCurve ec;
00417                 Point G;
00418                 <a class="code" href="class_integer.html">Integer</a> n;
00419 
00420                 source.<a class="code" href="class_name_value_pairs.html#_x_t_r___d_ha44">GetRequiredParameter</a>(<span class="stringliteral">"DL_GroupParameters_EC&lt;EC&gt;"</span>, Name::Curve(), ec);
00421                 source.<a class="code" href="class_name_value_pairs.html#_x_t_r___d_ha44">GetRequiredParameter</a>(<span class="stringliteral">"DL_GroupParameters_EC&lt;EC&gt;"</span>, Name::SubgroupGenerator(), G);
00422                 source.<a class="code" href="class_name_value_pairs.html#_x_t_r___d_ha44">GetRequiredParameter</a>(<span class="stringliteral">"DL_GroupParameters_EC&lt;EC&gt;"</span>, Name::SubgroupOrder(), n);
00423                 <a class="code" href="class_integer.html">Integer</a> k = source.<a class="code" href="class_name_value_pairs.html#_x_t_r___d_ha40">GetValueWithDefault</a>(Name::Cofactor(), <a class="code" href="class_integer.html#_integerz37_10">Integer::Zero</a>());
00424 
00425                 Initialize(ec, G, n, k);
00426         }
00427 }
00428 
00429 <span class="keyword">template</span> &lt;<span class="keyword">class</span> EC&gt;
<a name="l00430"></a><a class="code" href="class_d_l___group_parameters___e_c.html#_d_l___group_parameters___e_ca8">00430</a> <span class="keywordtype">void</span> <a class="code" href="class_d_l___group_parameters___e_c.html#_d_l___group_parameters___e_ca8">DL_GroupParameters_EC&lt;EC&gt;::GenerateRandom</a>(<a class="code" href="class_random_number_generator.html">RandomNumberGenerator</a> &amp;rng, <span class="keyword">const</span> <a class="code" href="class_name_value_pairs.html">NameValuePairs</a> &amp;alg)
00431 {
00432         <span class="keywordflow">try</span>
00433         {
00434                 <a class="code" href="class_d_l___group_parameters___e_c.html#_d_l___group_parameters___e_ca7">AssignFrom</a>(alg);
00435         }
00436         <span class="keywordflow">catch</span> (<a class="code" href="class_invalid_argument.html">InvalidArgument</a> &amp;)
00437         {
00438                 <span class="keywordflow">throw</span> <a class="code" href="class_not_implemented.html">NotImplemented</a>(<span class="stringliteral">"DL_GroupParameters_EC&lt;EC&gt;: curve generation is not implemented yet"</span>);
00439         }
00440 }
00441 
00442 <span class="keyword">template</span> &lt;<span class="keyword">class</span> EC&gt;
00443 <span class="keywordtype">void</span> <a class="code" href="class_d_l___group_parameters___e_c.html">DL_GroupParameters_EC&lt;EC&gt;::BERDecode</a>(<a class="code" href="class_buffered_transformation.html">BufferedTransformation</a> &amp;bt)
00444 {
00445         byte b;
00446         <span class="keywordflow">if</span> (!bt.<a class="code" href="class_buffered_transformation.html#_zlib_decompressorz7_4">Peek</a>(b))
00447                 BERDecodeError();
00448         <span class="keywordflow">if</span> (b == OBJECT_IDENTIFIER)
00449                 Initialize(OID(bt));
00450         <span class="keywordflow">else</span>
00451         {
00452                 <a class="code" href="class_b_e_r_sequence_decoder.html">BERSequenceDecoder</a> seq(bt);
00453                         word32 version;
00454                         BERDecodeUnsigned&lt;word32&gt;(seq, version, INTEGER, 1, 1); <span class="comment">// check version</span>
00455                         EllipticCurve ec(seq);
00456                         Point G = ec.BERDecodePoint(seq);
00457                         <a class="code" href="class_integer.html">Integer</a> n(seq);
00458                         <a class="code" href="class_integer.html">Integer</a> k;
00459                         <span class="keywordtype">bool</span> cofactorPresent = !seq.EndReached();
00460                         <span class="keywordflow">if</span> (cofactorPresent)
00461                                 k.<a class="code" href="class_integer.html#_integerz39_9">BERDecode</a>(seq);
00462                         <span class="keywordflow">else</span>
00463                                 k = <a class="code" href="class_integer.html#_integerz37_10">Integer::Zero</a>();
00464                 seq.MessageEnd();
00465 
00466                 Initialize(ec, G, n, k);
00467         }
00468 }
00469 
00470 <span class="keyword">template</span> &lt;<span class="keyword">class</span> EC&gt;
00471 <span class="keywordtype">void</span> <a class="code" href="class_d_l___group_parameters___e_c.html">DL_GroupParameters_EC&lt;EC&gt;::DEREncode</a>(<a class="code" href="class_buffered_transformation.html">BufferedTransformation</a> &amp;bt)<span class="keyword"> const</span>
00472 <span class="keyword"></span>{
00473         <span class="keywordflow">if</span> (m_encodeAsOID &amp;&amp; !m_oid.<a class="code" href="class_o_i_d.html#_o_i_do0">m_values</a>.empty())
00474                 m_oid.<a class="code" href="class_o_i_d.html#_o_i_da4">DEREncode</a>(bt);
00475         <span class="keywordflow">else</span>
00476         {
00477                 <a class="code" href="class_d_e_r_sequence_encoder.html">DERSequenceEncoder</a> seq(bt);
00478                 DEREncodeUnsigned&lt;word32&gt;(seq, 1);      <span class="comment">// version</span>
00479                 GetCurve().DEREncode(seq);
00480                 GetCurve().DEREncodePoint(seq, GetSubgroupGenerator(), m_compress);
00481                 m_n.<a class="code" href="class_integer.html#_integerz39_3">DEREncode</a>(seq);
00482                 <span class="keywordflow">if</span> (m_k.<a class="code" href="class_integer.html#_integerz41_9">NotZero</a>())
00483                         m_k.<a class="code" href="class_integer.html#_integerz39_3">DEREncode</a>(seq);
00484                 seq.MessageEnd();
00485         }
00486 }
00487 
00488 <span class="keyword">template</span> &lt;<span class="keyword">class</span> EC&gt;
00489 <a class="code" href="class_integer.html">Integer</a> <a class="code" href="class_d_l___group_parameters___e_c.html">DL_GroupParameters_EC&lt;EC&gt;::GetCofactor</a>()<span class="keyword"> const</span>
00490 <span class="keyword"></span>{
00491         <span class="keywordflow">if</span> (!m_k)
00492         {
00493                 <a class="code" href="class_integer.html">Integer</a> q = GetCurve().FieldSize();
00494                 <a class="code" href="class_integer.html">Integer</a> qSqrt = q.<a class="code" href="class_integer.html#_integerz49_3">SquareRoot</a>();
00495                 m_k = (q+2*qSqrt+1)/m_n;
00496         }
00497 
00498         <span class="keywordflow">return</span> m_k;
00499 }
00500 
00501 <span class="keyword">template</span> &lt;<span class="keyword">class</span> EC&gt;
00502 <a class="code" href="class_integer.html">Integer</a> <a class="code" href="class_d_l___group_parameters___e_c.html">DL_GroupParameters_EC&lt;EC&gt;::ConvertElementToInteger</a>(<span class="keyword">const</span> Element &amp;element)<span class="keyword"> const</span>
00503 <span class="keyword"></span>{
00504         <span class="keywordflow">return</span> ConvertToInteger(element.x);
00505 };
00506 
00507 <span class="keyword">template</span> &lt;<span class="keyword">class</span> EC&gt;
00508 <span class="keywordtype">bool</span> <a class="code" href="class_d_l___group_parameters___e_c.html">DL_GroupParameters_EC&lt;EC&gt;::ValidateGroup</a>(<a class="code" href="class_random_number_generator.html">RandomNumberGenerator</a> &amp;rng, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> level)<span class="keyword"> const</span>
00509 <span class="keyword"></span>{
00510         <span class="keywordtype">bool</span> pass = GetCurve().ValidateParameters(rng, level);
00511 
00512         <a class="code" href="class_integer.html">Integer</a> q = GetCurve().FieldSize();
00513         pass = pass &amp;&amp; m_n!=q;
00514 
00515         <span class="keywordflow">if</span> (level &gt;= 2)
00516         {
00517                 <a class="code" href="class_integer.html">Integer</a> qSqrt = q.<a class="code" href="class_integer.html#_integerz49_3">SquareRoot</a>();