📄 eprecomp_8cpp-source.html
字号:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8"><title>Crypto++: eprecomp.cpp Source File</title><link href="doxygen.css" rel="stylesheet" type="text/css"><link href="tabs.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.5.2 --><div class="tabs"> <ul> <li><a href="index.html"><span>Main Page</span></a></li> <li><a href="namespaces.html"><span>Namespaces</span></a></li> <li><a href="classes.html"><span>Classes</span></a></li> <li class="current"><a href="files.html"><span>Files</span></a></li> </ul></div><div class="tabs"> <ul> <li><a href="files.html"><span>File List</span></a></li> <li><a href="globals.html"><span>File Members</span></a></li> </ul></div><h1>eprecomp.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// eprecomp.cpp - written and placed in the public domain by Wei Dai</span><a name="l00002"></a>00002 <a name="l00003"></a>00003 <span class="preprocessor">#include "pch.h"</span><a name="l00004"></a>00004 <a name="l00005"></a>00005 <span class="comment">// prevent Sun's CC compiler from including this file automatically</span><a name="l00006"></a>00006 <span class="preprocessor">#if !defined(__SUNPRO_CC) || defined(CRYPTOPP_MANUALLY_INSTANTIATE_TEMPLATES)</span><a name="l00007"></a>00007 <span class="preprocessor"></span><a name="l00008"></a>00008 <span class="preprocessor">#ifndef CRYPTOPP_IMPORTS</span><a name="l00009"></a>00009 <span class="preprocessor"></span><a name="l00010"></a>00010 <span class="preprocessor">#include "eprecomp.h"</span><a name="l00011"></a>00011 <span class="preprocessor">#include "asn.h"</span><a name="l00012"></a>00012 <a name="l00013"></a>00013 NAMESPACE_BEGIN(CryptoPP)<a name="l00014"></a>00014 <a name="l00015"></a><a class="code" href="class_d_l___fixed_base_precomputation_impl.html#84f4151f6ffb1b05b8f0efccd120d169">00015</a> template <class T> <span class="keywordtype">void</span> <a class="code" href="class_d_l___fixed_base_precomputation_impl.html">DL_FixedBasePrecomputationImpl</a><T>::SetBase(const <a class="code" href="class_d_l___group_precomputation.html">DL_GroupPrecomputation</a><Element> &group, const Element &i_base)<a name="l00016"></a>00016 {<a name="l00017"></a>00017 m_base = group.NeedConversions() ? group.ConvertIn(i_base) : i_base;<a name="l00018"></a>00018 <a name="l00019"></a>00019 <span class="keywordflow">if</span> (m_bases.empty() || !(m_base == m_bases[0]))<a name="l00020"></a>00020 {<a name="l00021"></a>00021 m_bases.resize(1);<a name="l00022"></a>00022 m_bases[0] = m_base;<a name="l00023"></a>00023 }<a name="l00024"></a>00024 <a name="l00025"></a>00025 <span class="keywordflow">if</span> (group.NeedConversions())<a name="l00026"></a>00026 m_base = i_base;<a name="l00027"></a>00027 }<a name="l00028"></a>00028 <a name="l00029"></a><a class="code" href="class_d_l___fixed_base_precomputation_impl.html#aef0287112a39612d23c00fa6ceb4782">00029</a> <span class="keyword">template</span> <<span class="keyword">class</span> T> <span class="keywordtype">void</span> <a class="code" href="class_d_l___fixed_base_precomputation_impl.html#aef0287112a39612d23c00fa6ceb4782">DL_FixedBasePrecomputationImpl<T>::Precompute</a>(<span class="keyword">const</span> <a class="code" href="class_d_l___group_precomputation.html">DL_GroupPrecomputation<Element></a> &group, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> maxExpBits, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> storage)<a name="l00030"></a>00030 {<a name="l00031"></a>00031 assert(m_bases.size() > 0);<a name="l00032"></a>00032 assert(storage <= maxExpBits);<a name="l00033"></a>00033 <a name="l00034"></a>00034 <span class="keywordflow">if</span> (storage > 1)<a name="l00035"></a>00035 {<a name="l00036"></a>00036 m_windowSize = (maxExpBits+storage-1)/storage;<a name="l00037"></a>00037 m_exponentBase = <a class="code" href="class_integer.html#de53248f5dbb520273a70856b975417c" title="return the integer 2**e">Integer::Power2</a>(m_windowSize);<a name="l00038"></a>00038 }<a name="l00039"></a>00039 <a name="l00040"></a>00040 m_bases.resize(storage);<a name="l00041"></a>00041 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> i=1; i<storage; i++)<a name="l00042"></a>00042 m_bases[i] = group.<a class="code" href="class_d_l___group_precomputation.html#6a0d6f599656d439c7254fbd1855d155">GetGroup</a>().ScalarMultiply(m_bases[i-1], m_exponentBase);<a name="l00043"></a>00043 }<a name="l00044"></a>00044 <a name="l00045"></a><a class="code" href="class_d_l___fixed_base_precomputation_impl.html#15b52a9f5d25dedceb7fb88ddef3eee0">00045</a> <span class="keyword">template</span> <<span class="keyword">class</span> T> <span class="keywordtype">void</span> <a class="code" href="class_d_l___fixed_base_precomputation_impl.html#15b52a9f5d25dedceb7fb88ddef3eee0">DL_FixedBasePrecomputationImpl<T>::Load</a>(<span class="keyword">const</span> <a class="code" href="class_d_l___group_precomputation.html">DL_GroupPrecomputation<Element></a> &group, <a class="code" href="class_buffered_transformation.html" title="interface for buffered transformations">BufferedTransformation</a> &bt)<a name="l00046"></a>00046 {<a name="l00047"></a>00047 <a class="code" href="class_b_e_r_sequence_decoder.html" title="BER Sequence Decoder.">BERSequenceDecoder</a> seq(bt);<a name="l00048"></a>00048 word32 version;<a name="l00049"></a>00049 BERDecodeUnsigned<word32>(seq, version, INTEGER, 1, 1);<a name="l00050"></a>00050 m_exponentBase.<a class="code" href="class_integer.html#810fc0382f8928893fe192ab79b1972c">BERDecode</a>(seq);<a name="l00051"></a>00051 m_windowSize = m_exponentBase.<a class="code" href="class_integer.html#867356d88074424328d0ebb9bea63254" title="number of significant bits = floor(log2(abs(*this))) + 1">BitCount</a>() - 1;⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -