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<!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++: rw.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>rw.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// rw.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 <span class="preprocessor">#include "<a class="code" href="rw_8h.html" title="This file contains classes that implement the Rabin-Williams signature schemes as...">rw.h</a>"</span><a name="l00005"></a>00005 <span class="preprocessor">#include "nbtheory.h"</span><a name="l00006"></a>00006 <span class="preprocessor">#include "asn.h"</span><a name="l00007"></a>00007 <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 NAMESPACE_BEGIN(CryptoPP)<a name="l00011"></a>00011 <a name="l00012"></a><a class="code" href="class_r_w_function.html#d6ec85792b74c6dd4c9d48cabefdd882">00012</a> void <a class="code" href="class_r_w_function.html" title="_">RWFunction</a>::BERDecode(<a class="code" href="class_buffered_transformation.html" title="interface for buffered transformations">BufferedTransformation</a> &bt)<a name="l00013"></a>00013 {<a name="l00014"></a>00014 <a class="code" href="class_b_e_r_sequence_decoder.html" title="BER Sequence Decoder.">BERSequenceDecoder</a> seq(bt);<a name="l00015"></a>00015 m_n.BERDecode(seq);<a name="l00016"></a>00016 seq.<a class="code" href="class_b_e_r_general_decoder.html#40b14625c98ac7febb8ca218d02358ad">MessageEnd</a>();<a name="l00017"></a>00017 }<a name="l00018"></a>00018 <a name="l00019"></a><a class="code" href="class_r_w_function.html#bc83ab74fc89120f83bd8d387b5b436c">00019</a> <span class="keywordtype">void</span> <a class="code" href="class_r_w_function.html#bc83ab74fc89120f83bd8d387b5b436c">RWFunction::DEREncode</a>(<a class="code" href="class_buffered_transformation.html" title="interface for buffered transformations">BufferedTransformation</a> &bt)<span class="keyword"> const</span><a name="l00020"></a>00020 <span class="keyword"></span>{<a name="l00021"></a>00021 <a class="code" href="class_d_e_r_sequence_encoder.html" title="DER Sequence Encoder.">DERSequenceEncoder</a> seq(bt);<a name="l00022"></a>00022 <a class="code" href="class_r_w_function.html#21b3158cafdb7121e6305b742ffb340f">m_n</a>.<a class="code" href="class_integer.html#6ab51a05bee88cfa690179611e8a084e" title="encode using Distinguished Encoding Rules, put result into a BufferedTransformation...">DEREncode</a>(seq);<a name="l00023"></a>00023 seq.<a class="code" href="class_d_e_r_general_encoder.html#cb5f1a94ba97027c603b019bd5228510">MessageEnd</a>();<a name="l00024"></a>00024 }<a name="l00025"></a>00025 <a name="l00026"></a><a class="code" href="class_r_w_function.html#cddf9a5cb9d37ab07a1535f644cdac19">00026</a> <a class="code" href="class_integer.html" title="multiple precision integer and basic arithmetics">Integer</a> <a class="code" href="class_r_w_function.html#cddf9a5cb9d37ab07a1535f644cdac19">RWFunction::ApplyFunction</a>(<span class="keyword">const</span> <a class="code" href="class_integer.html" title="multiple precision integer and basic arithmetics">Integer</a> &in)<span class="keyword"> const</span><a name="l00027"></a>00027 <span class="keyword"></span>{<a name="l00028"></a>00028 <a class="code" href="class_crypto_material.html#a1da44802c5cf00946043922cb9e7e6e">DoQuickSanityCheck</a>();<a name="l00029"></a>00029 <a name="l00030"></a>00030 <a class="code" href="class_integer.html" title="multiple precision integer and basic arithmetics">Integer</a> out = in.<a class="code" href="class_integer.html#7b5e639045868c5ac338f4180e1c7efa">Squared</a>()%<a class="code" href="class_r_w_function.html#21b3158cafdb7121e6305b742ffb340f">m_n</a>;<a name="l00031"></a>00031 <span class="keyword">const</span> word r = 12;<a name="l00032"></a>00032 <span class="comment">// this code was written to handle both r = 6 and r = 12,</span><a name="l00033"></a>00033 <span class="comment">// but now only r = 12 is used in P1363</span><a name="l00034"></a>00034 <span class="keyword">const</span> word r2 = r/2;<a name="l00035"></a>00035 <span class="keyword">const</span> word r3a = (16 + 5 - r) % 16; <span class="comment">// n%16 could be 5 or 13</span><a name="l00036"></a>00036 <span class="keyword">const</span> word r3b = (16 + 13 - r) % 16;<a name="l00037"></a>00037 <span class="keyword">const</span> word r4 = (8 + 5 - r/2) % 8; <span class="comment">// n%8 == 5</span><a name="l00038"></a>00038 <span class="keywordflow">switch</span> (out % 16)<a name="l00039"></a>00039 {<a name="l00040"></a>00040 <span class="keywordflow">case</span> r:<a name="l00041"></a>00041 <span class="keywordflow">break</span>;<a name="l00042"></a>00042 <span class="keywordflow">case</span> r2:<a name="l00043"></a>00043 <span class="keywordflow">case</span> r2+8:<a name="l00044"></a>00044 out <<= 1;<a name="l00045"></a>00045 <span class="keywordflow">break</span>;<a name="l00046"></a>00046 <span class="keywordflow">case</span> r3a:<a name="l00047"></a>00047 <span class="keywordflow">case</span> r3b:<a name="l00048"></a>00048 out.<a class="code" href="class_integer.html#87410093addf9a2253fe07b39b918b02">Negate</a>();<a name="l00049"></a>00049 out += <a class="code" href="class_r_w_function.html#21b3158cafdb7121e6305b742ffb340f">m_n</a>;<a name="l00050"></a>00050 <span class="keywordflow">break</span>;<a name="l00051"></a>00051 <span class="keywordflow">case</span> r4:<a name="l00052"></a>00052 <span class="keywordflow">case</span> r4+8:<a name="l00053"></a>00053 out.<a class="code" href="class_integer.html#87410093addf9a2253fe07b39b918b02">Negate</a>();<a name="l00054"></a>00054 out += <a class="code" href="class_r_w_function.html#21b3158cafdb7121e6305b742ffb340f">m_n</a>;⌨️ 快捷键说明
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