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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>Crypto++: ec2n.h Source File</title><link href="doxygen.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.3.2 --><div class="qindex"><a class="qindex" href="index.html">Main Page</a> | <a class="qindex" href="namespaces.html">Namespace List</a> | <a class="qindex" href="hierarchy.html">Class Hierarchy</a> | <a class="qindex" href="classes.html">Alphabetical List</a> | <a class="qindex" href="annotated.html">Compound List</a> | <a class="qindex" href="files.html">File List</a> | <a class="qindex" href="namespacemembers.html">Namespace Members</a> | <a class="qindex" href="functions.html">Compound Members</a> | <a class="qindex" href="globals.html">File Members</a></div><h1>ec2n.h</h1><div class="fragment"><pre>00001 <span class="preprocessor">#ifndef CRYPTOPP_EC2N_H</span>00002 <span class="preprocessor"></span><span class="preprocessor">#define CRYPTOPP_EC2N_H</span>00003 <span class="preprocessor"></span>00004 <span class="preprocessor">#include "<a class="code" href="gf2n_8h.html">gf2n.h</a>"</span>00005 <span class="preprocessor">#include "eprecomp.h"</span>00006 <span class="preprocessor">#include "smartptr.h"</span>00007 <span class="preprocessor">#include "<a class="code" href="pubkey_8h.html">pubkey.h</a>"</span>00008 00009 NAMESPACE_BEGIN(CryptoPP)00010 00011 <span class="comment">//! Elliptic Curve Point</span><a name="l00012"></a><a class="code" href="struct_e_c2_n_point.html">00012</a> <span class="comment"></span><span class="keyword">struct </span>CRYPTOPP_DLL EC2NPoint00013 {00014 EC2NPoint() : identity(<span class="keyword">true</span>) {}00015 EC2NPoint(<span class="keyword">const</span> <a class="code" href="class_polynomial_mod2.html">PolynomialMod2</a> &x, <span class="keyword">const</span> <a class="code" href="class_polynomial_mod2.html">PolynomialMod2</a> &y)00016 : identity(<span class="keyword">false</span>), x(x), y(y) {}00017 00018 <span class="keywordtype">bool</span> operator==(<span class="keyword">const</span> EC2NPoint &t)<span class="keyword"> const</span>00019 <span class="keyword"> </span>{<span class="keywordflow">return</span> (identity && t.identity) || (!identity && !t.identity && x==t.x && y==t.y);}00020 <span class="keywordtype">bool</span> operator< (<span class="keyword">const</span> EC2NPoint &t)<span class="keyword"> const</span>00021 <span class="keyword"> </span>{<span class="keywordflow">return</span> identity ? !t.identity : (!t.identity && (x<t.x || (x==t.x && y<t.y)));}00022 00023 <span class="keywordtype">bool</span> identity;00024 <a class="code" href="class_polynomial_mod2.html">PolynomialMod2</a> x, y;00025 };00026 00027 CRYPTOPP_DLL_TEMPLATE_CLASS <a class="code" href="class_abstract_group.html">AbstractGroup<EC2NPoint></a>;00028 <span class="comment"></span>00029 <span class="comment">//! Elliptic Curve over GF(2^n)</span><a name="l00030"></a><a class="code" href="class_e_c2_n.html">00030</a> <span class="comment"></span><span class="keyword">class </span>CRYPTOPP_DLL EC2N : <span class="keyword">public</span> <a class="code" href="class_abstract_group.html">AbstractGroup</a><EC2NPoint>00031 {00032 <span class="keyword">public</span>:00033 <span class="keyword">typedef</span> <a class="code" href="class_g_f2_n_p.html">GF2NP</a> <a class="code" href="class_g_f2_n_p.html">Field</a>;00034 <span class="keyword">typedef</span> Field::Element FieldElement;00035 <span class="keyword">typedef</span> EC2NPoint <a class="code" href="struct_e_c2_n_point.html">Point</a>;00036 00037 EC2N() {}00038 EC2N(<span class="keyword">const</span> <a class="code" href="class_g_f2_n_p.html">Field</a> &field, <span class="keyword">const</span> Field::Element &a, <span class="keyword">const</span> Field::Element &b)00039 : m_field(field), m_a(a), m_b(b) {}00040 <span class="comment">// construct from BER encoded parameters</span>00041 <span class="comment">// this constructor will decode and extract the the fields fieldID and curve of the sequence ECParameters</span>00042 EC2N(<a class="code" href="class_buffered_transformation.html">BufferedTransformation</a> &bt);00043 00044 <span class="comment">// encode the fields fieldID and curve of the sequence ECParameters</span>00045 <span class="keywordtype">void</span> DEREncode(<a class="code" href="class_buffered_transformation.html">BufferedTransformation</a> &bt) <span class="keyword">const</span>;00046 00047 <span class="keywordtype">bool</span> Equal(<span class="keyword">const</span> <a class="code" href="struct_e_c2_n_point.html">Point</a> &P, <span class="keyword">const</span> <a class="code" href="struct_e_c2_n_point.html">Point</a> &Q) <span class="keyword">const</span>;00048 <span class="keyword">const</span> <a class="code" href="struct_e_c2_n_point.html">Point</a>& Identity() <span class="keyword">const</span>;00049 <span class="keyword">const</span> <a class="code" href="struct_e_c2_n_point.html">Point</a>& Inverse(<span class="keyword">const</span> <a class="code" href="struct_e_c2_n_point.html">Point</a> &P) <span class="keyword">const</span>;00050 <span class="keywordtype">bool</span> InversionIsFast()<span class="keyword"> const </span>{<span class="keywordflow">return</span> <span class="keyword">true</span>;}00051 <span class="keyword">const</span> <a class="code" href="struct_e_c2_n_point.html">Point</a>& Add(<span class="keyword">const</span> <a class="code" href="struct_e_c2_n_point.html">Point</a> &P, <span class="keyword">const</span> <a class="code" href="struct_e_c2_n_point.html">Point</a> &Q) <span class="keyword">const</span>;00052 <span class="keyword">const</span> <a class="code" href="struct_e_c2_n_point.html">Point</a>& Double(<span class="keyword">const</span> <a class="code" href="struct_e_c2_n_point.html">Point</a> &P) <span class="keyword">const</span>;00053 00054 <a class="code" href="struct_e_c2_n_point.html">Point</a> Multiply(<span class="keyword">const</span> <a class="code" href="class_integer.html">Integer</a> &k, <span class="keyword">const</span> <a class="code" href="struct_e_c2_n_point.html">Point</a> &P)<span class="keyword"> const</span>00055 <span class="keyword"> </span>{<span class="keywordflow">return</span> ScalarMultiply(P, k);}00056 <a class="code" href="struct_e_c2_n_point.html">Point</a> CascadeMultiply(<span class="keyword">const</span> <a class="code" href="class_integer.html">Integer</a> &k1, <span class="keyword">const</span> <a class="code" href="struct_e_c2_n_point.html">Point</a> &P, <span class="keyword">const</span> <a class="code" href="class_integer.html">Integer</a> &k2, <span class="keyword">const</span> <a class="code" href="struct_e_c2_n_point.html">Point</a> &Q)<span class="keyword"> const</span>00057 <span class="keyword"> </span>{<span class="keywordflow">return</span> CascadeScalarMultiply(P, k1, Q, k2);}00058 00059 <span class="keywordtype">bool</span> ValidateParameters(<a class="code" href="class_random_number_generator.html">RandomNumberGenerator</a> &rng, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> level=3) <span class="keyword">const</span>;00060 <span class="keywordtype">bool</span> VerifyPoint(<span class="keyword">const</span> <a class="code" href="struct_e_c2_n_point.html">Point</a> &P) <span class="keyword">const</span>;00061 00062 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> EncodedPointSize(<span class="keywordtype">bool</span> compressed = <span class="keyword">false</span>)<span class="keyword"> const</span>00063 <span class="keyword"> </span>{<span class="keywordflow">return</span> 1 + (compressed?1:2)*m_field->MaxElementByteLength();}00064 <span class="comment">// returns false if point is compressed and not valid (doesn't check if uncompressed)</span>00065 <span class="keywordtype">bool</span> DecodePoint(<a class="code" href="struct_e_c2_n_point.html">Point</a> &P, <a class="code" href="class_buffered_transformation.html">BufferedTransformation</a> &bt, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> len) <span class="keyword">const</span>;00066 <span class="keywordtype">bool</span> DecodePoint(<a class="code" href="struct_e_c2_n_point.html">Point</a> &P, <span class="keyword">const</span> byte *encodedPoint, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> len) <span class="keyword">const</span>;00067 <span class="keywordtype">void</span> EncodePoint(byte *encodedPoint, <span class="keyword">const</span> <a class="code" href="struct_e_c2_n_point.html">Point</a> &P, <span class="keywordtype">bool</span> compressed) <span class="keyword">const</span>;00068 <span class="keywordtype">void</span> EncodePoint(<a class="code" href="class_buffered_transformation.html">BufferedTransformation</a> &bt, <span class="keyword">const</span> <a class="code" href="struct_e_c2_n_point.html">Point</a> &P, <span class="keywordtype">bool</span> compressed) <span class="keyword">const</span>;00069 00070 <a class="code" href="struct_e_c2_n_point.html">Point</a> BERDecodePoint(<a class="code" href="class_buffered_transformation.html">BufferedTransformation</a> &bt) <span class="keyword">const</span>;00071 <span class="keywordtype">void</span> DEREncodePoint(<a class="code" href="class_buffered_transformation.html">BufferedTransformation</a> &bt, <span class="keyword">const</span> <a class="code" href="struct_e_c2_n_point.html">Point</a> &P, <span class="keywordtype">bool</span> compressed) <span class="keyword">const</span>;00072 00073 <a class="code" href="class_integer.html">Integer</a> FieldSize()<span class="keyword"> const </span>{<span class="keywordflow">return</span> <a class="code" href="class_integer.html#_integerz37_13">Integer::Power2</a>(m_field->MaxElementBitLength());}00074 <span class="keyword">const</span> <a class="code" href="class_g_f2_n_p.html">Field</a> & GetField()<span class="keyword"> const </span>{<span class="keywordflow">return</span> *m_field;}00075 <span class="keyword">const</span> FieldElement & GetA()<span class="keyword"> const </span>{<span class="keywordflow">return</span> m_a;}00076 <span class="keyword">const</span> FieldElement & GetB()<span class="keyword"> const </span>{<span class="keywordflow">return</span> m_b;}00077 00078 <span class="keywordtype">bool</span> operator==(<span class="keyword">const</span> EC2N &rhs)<span class="keyword"> const</span>00079 <span class="keyword"> </span>{<span class="keywordflow">return</span> GetField() == rhs.<a class="code" href="class_e_c2_n.html#_e_c2_na22">GetField</a>() && m_a == rhs.<a class="code" href="class_e_c2_n.html#_e_c2_nr1">m_a</a> && m_b == rhs.<a class="code" href="class_e_c2_n.html#_e_c2_nr2">m_b</a>;}00080 00081 <span class="keyword">private</span>:00082 clonable_ptr<Field> m_field;00083 FieldElement m_a, m_b;00084 <span class="keyword">mutable</span> <a class="code" href="struct_e_c2_n_point.html">Point</a> m_R;00085 };00086 00087 CRYPTOPP_DLL_TEMPLATE_CLASS DL_FixedBasePrecomputationImpl<EC2N::Point>;00088 CRYPTOPP_DLL_TEMPLATE_CLASS DL_GroupPrecomputation<EC2N::Point>;00089 00090 <span class="keyword">template</span> <<span class="keyword">class</span> T> <span class="keyword">class </span>EcPrecomputation;00091 <span class="comment"></span>00092 <span class="comment">//! .</span><a name="l00093"></a><a class="code" href="class_ec_precomputation_3_01_e_c2_n_01_4.html">00093</a> <span class="comment"></span><span class="keyword">template</span><> <span class="keyword">class </span>EcPrecomputation<EC2N> : <span class="keyword">public</span> DL_GroupPrecomputation<EC2N::Point>00094 {00095 <span class="keyword">public</span>:00096 <span class="keyword">typedef</span> EC2N <a class="code" href="class_e_c2_n.html">EllipticCurve</a>;00097 00098 <span class="comment">// DL_GroupPrecomputation</span>00099 <span class="keyword">const</span> <a class="code" href="class_abstract_group.html">AbstractGroup<Element></a> & GetGroup()<span class="keyword"> const </span>{<span class="keywordflow">return</span> m_ec;}00100 Element BERDecodeElement(<a class="code" href="class_buffered_transformation.html">BufferedTransformation</a> &bt)<span class="keyword"> const </span>{<span class="keywordflow">return</span> m_ec.BERDecodePoint(bt);}00101 <span class="keywordtype">void</span> DEREncodeElement(<a class="code" href="class_buffered_transformation.html">BufferedTransformation</a> &bt, <span class="keyword">const</span> Element &v)<span class="keyword"> const </span>{m_ec.DEREncodePoint(bt, v, <span class="keyword">false</span>);}00102 00103 <span class="comment">// non-inherited</span>00104 <span class="keywordtype">void</span> SetCurve(<span class="keyword">const</span> EC2N &ec) {m_ec = ec;}00105 <span class="keyword">const</span> EC2N & GetCurve()<span class="keyword"> const </span>{<span class="keywordflow">return</span> m_ec;}00106 00107 <span class="keyword">private</span>:00108 EC2N m_ec;00109 };00110 00111 NAMESPACE_END00112 00113 <span class="preprocessor">#endif</span></pre></div><hr size="1"><address style="align: right;"><small>Generated on Tue Jul 8 23:34:13 2003 for Crypto++ by<a href="http://www.doxygen.org/index.html"><img src="doxygen.png" alt="doxygen" align="middle" border=0 > </a>1.3.2 </small></address></body></html>⌨️ 快捷键说明
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