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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++: strciphr.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>strciphr.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// strciphr.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 "<a class="code" href="strciphr_8h.html">strciphr.h</a>"</span><a name="l00011"></a>00011 <a name="l00012"></a>00012 NAMESPACE_BEGIN(CryptoPP)<a name="l00013"></a>00013 <a name="l00014"></a>00014 template <class S><a name="l00015"></a><a class="code" href="class_additive_cipher_template.html#e3b8f05b15fee7d363a5a3009cf5ef6b">00015</a> <span class="keywordtype">void</span> <a class="code" href="class_additive_cipher_template.html">AdditiveCipherTemplate</a><S>::UncheckedSetKey(const byte *key, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> length, const <a class="code" href="class_name_value_pairs.html" title="interface for retrieving values given their names">NameValuePairs</a> &params)<a name="l00016"></a>00016 {<a name="l00017"></a>00017 PolicyInterface &policy = this->AccessPolicy();<a name="l00018"></a>00018 policy.CipherSetKey(params, key, length);<a name="l00019"></a>00019 m_leftOver = 0;<a name="l00020"></a>00020 m_buffer.New(GetBufferByteSize(policy));<a name="l00021"></a>00021 <a name="l00022"></a>00022 <span class="keywordflow">if</span> (this->IsResynchronizable())<a name="l00023"></a>00023 policy.CipherResynchronize(m_buffer, this->GetIVAndThrowIfInvalid(params));<a name="l00024"></a>00024 }<a name="l00025"></a>00025 <a name="l00026"></a>00026 <span class="keyword">template</span> <<span class="keyword">class</span> S><a name="l00027"></a><a class="code" href="class_additive_cipher_template.html#a8cfabe995c7262fc51e63d8d8269c2b">00027</a> <span class="keywordtype">void</span> <a class="code" href="class_additive_cipher_template.html#a8cfabe995c7262fc51e63d8d8269c2b">AdditiveCipherTemplate<S>::GenerateBlock</a>(byte *outString, <span class="keywordtype">size_t</span> length)<a name="l00028"></a>00028 {<a name="l00029"></a>00029 <span class="keywordflow">if</span> (<a class="code" href="class_additive_cipher_template.html#0c2f1c9e2245bff40739170769ea39c4">m_leftOver</a> > 0)<a name="l00030"></a>00030 {<a name="l00031"></a>00031 <span class="keywordtype">size_t</span> len = STDMIN(<a class="code" href="class_additive_cipher_template.html#0c2f1c9e2245bff40739170769ea39c4">m_leftOver</a>, length);<a name="l00032"></a>00032 memcpy(outString, <a class="code" href="class_additive_cipher_template.html#99f88c7364a00f78d4afe44f4c962e9e">KeystreamBufferEnd</a>()-<a class="code" href="class_additive_cipher_template.html#0c2f1c9e2245bff40739170769ea39c4">m_leftOver</a>, len);<a name="l00033"></a>00033 length -= len;<a name="l00034"></a>00034 <a class="code" href="class_additive_cipher_template.html#0c2f1c9e2245bff40739170769ea39c4">m_leftOver</a> -= len;<a name="l00035"></a>00035 outString += len;<a name="l00036"></a>00036 <a name="l00037"></a>00037 <span class="keywordflow">if</span> (!length)<a name="l00038"></a>00038 <span class="keywordflow">return</span>;<a name="l00039"></a>00039 }<a name="l00040"></a>00040 assert(<a class="code" href="class_additive_cipher_template.html#0c2f1c9e2245bff40739170769ea39c4">m_leftOver</a> == 0);<a name="l00041"></a>00041 <a name="l00042"></a>00042 <a class="code" href="class_additive_cipher_template.html#79b269d3b9def1c573eb8b73926bbfdf">PolicyInterface</a> &policy = this->AccessPolicy();<a name="l00043"></a>00043 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> bytesPerIteration = policy.GetBytesPerIteration();<a name="l00044"></a>00044 <a name="l00045"></a>00045 <span class="keywordflow">if</span> (length >= bytesPerIteration)<a name="l00046"></a>00046 {<a name="l00047"></a>00047 <span class="keywordtype">size_t</span> iterations = length / bytesPerIteration;<a name="l00048"></a>00048 policy.WriteKeystream(outString, iterations);<a name="l00049"></a>00049 outString += iterations * bytesPerIteration;<a name="l00050"></a>00050 length -= iterations * bytesPerIteration;<a name="l00051"></a>00051 <a name="l00052"></a>00052 <span class="keywordflow">if</span> (!length)<a name="l00053"></a>00053 <span class="keywordflow">return</span>;<a name="l00054"></a>00054 }<a name="l00055"></a>00055 <a name="l00056"></a>00056 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> bufferByteSize = <a class="code" href="class_additive_cipher_template.html#2b8c6e4e11ac35c6f267991d0b62f84c">GetBufferByteSize</a>(policy);<a name="l00057"></a>00057 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> bufferIterations = policy.GetIterationsToBuffer();<a name="l00058"></a>00058 <a name="l00059"></a>00059 <span class="keywordflow">while</span> (length >= bufferByteSize)<a name="l00060"></a>00060 {<a name="l00061"></a>00061 policy.WriteKeystream(<a class="code" href="class_additive_cipher_template.html#dc071d835c1113d83a98ca62b09f0904">m_buffer</a>, bufferIterations);<a name="l00062"></a>00062 memcpy(outString, <a class="code" href="class_additive_cipher_template.html#a0b80a8012abd9061b9522102737069b">KeystreamBufferBegin</a>(), bufferByteSize);<a name="l00063"></a>00063 length -= bufferByteSize;<a name="l00064"></a>00064 outString += bufferByteSize;<a name="l00065"></a>00065 }<a name="l00066"></a>00066 <a name="l00067"></a>00067 <span class="keywordflow">if</span> (length > 0)<a name="l00068"></a>00068 {<a name="l00069"></a>00069 policy.WriteKeystream(<a class="code" href="class_additive_cipher_template.html#dc071d835c1113d83a98ca62b09f0904">m_buffer</a>, bufferIterations);<a name="l00070"></a>00070 memcpy(outString, <a class="code" href="class_additive_cipher_template.html#a0b80a8012abd9061b9522102737069b">KeystreamBufferBegin</a>(), length);<a name="l00071"></a>00071 <a class="code" href="class_additive_cipher_template.html#0c2f1c9e2245bff40739170769ea39c4">m_leftOver</a> = bytesPerIteration - length;<a name="l00072"></a>00072 }<a name="l00073"></a>00073 }<a name="l00074"></a>00074 <a name="l00075"></a>00075 <span class="keyword">template</span> <<span class="keyword">class</span> S><a name="l00076"></a><a class="code" href="class_additive_cipher_template.html#5903c41f2e4e2aa6df44715244f2f3f3">00076</a> <span class="keywordtype">void</span> <a class="code" href="class_additive_cipher_template.html#5903c41f2e4e2aa6df44715244f2f3f3">AdditiveCipherTemplate<S>::ProcessData</a>(byte *outString, <span class="keyword">const</span> byte *inString, <span class="keywordtype">size_t</span> length)<a name="l00077"></a>00077 {<a name="l00078"></a>00078 <span class="keywordflow">if</span> (<a class="code" href="class_additive_cipher_template.html#0c2f1c9e2245bff40739170769ea39c4">m_leftOver</a> > 0)<a name="l00079"></a>00079 {<a name="l00080"></a>00080 <span class="keywordtype">size_t</span> len = STDMIN(<a class="code" href="class_additive_cipher_template.html#0c2f1c9e2245bff40739170769ea39c4">m_leftOver</a>, length);<a name="l00081"></a>00081 xorbuf(outString, inString, <a class="code" href="class_additive_cipher_template.html#99f88c7364a00f78d4afe44f4c962e9e">KeystreamBufferEnd</a>()-<a class="code" href="class_additive_cipher_template.html#0c2f1c9e2245bff40739170769ea39c4">m_leftOver</a>, len);<a name="l00082"></a>00082 length -= len;<a name="l00083"></a>00083 <a class="code" href="class_additive_cipher_template.html#0c2f1c9e2245bff40739170769ea39c4">m_leftOver</a> -= len;<a name="l00084"></a>00084 inString += len;<a name="l00085"></a>00085 outString += len;<a name="l00086"></a>00086 <a name="l00087"></a>00087 <span class="keywordflow">if</span> (!length)<a name="l00088"></a>00088 <span class="keywordflow">return</span>;<a name="l00089"></a>00089 }<a name="l00090"></a>00090 assert(<a class="code" href="class_additive_cipher_template.html#0c2f1c9e2245bff40739170769ea39c4">m_leftOver</a> == 0);<a name="l00091"></a>00091 <a name="l00092"></a>00092 <a class="code" href="class_additive_cipher_template.html#79b269d3b9def1c573eb8b73926bbfdf">PolicyInterface</a> &policy = this->AccessPolicy();<a name="l00093"></a>00093 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> bytesPerIteration = policy.GetBytesPerIteration();<a name="l00094"></a>00094 <a name="l00095"></a>00095 <span class="keywordflow">if</span> (policy.CanOperateKeystream() && length >= bytesPerIteration)<a name="l00096"></a>00096 {<a name="l00097"></a>00097 <span class="keywordtype">size_t</span> iterations = length / bytesPerIteration;<a name="l00098"></a>00098 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> alignment = policy.GetAlignment();<a name="l00099"></a>00099 <a class="code" href="strciphr_8h.html#b4a226527d2bd01ff19bfa14d0974227">KeystreamOperation</a> operation = <a class="code" href="strciphr_8h.html#b4a226527d2bd01ff19bfa14d0974227">KeystreamOperation</a>((IsAlignedOn(inString, alignment) * 2) | (<span class="keywordtype">int</span>)IsAlignedOn(outString, alignment));<a name="l00100"></a>00100 <a name="l00101"></a>00101 policy.OperateKeystream(operation, outString, inString, iterations);<a name="l00102"></a>00102 <a name="l00103"></a>00103 inString += iterations * bytesPerIteration;<a name="l00104"></a>00104 outString += iterations * bytesPerIteration;<a name="l00105"></a>00105 length -= iterations * bytesPerIteration;<a name="l00106"></a>00106 <a name="l00107"></a>00107 <span class="keywordflow">if</span> (!length)<a name="l00108"></a>00108 <span class="keywordflow">return</span>;<a name="l00109"></a>00109 }<a name="l00110"></a>00110 <a name="l00111"></a>00111 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> bufferByteSize = <a class="code" href="class_additive_cipher_template.html#2b8c6e4e11ac35c6f267991d0b62f84c">GetBufferByteSize</a>(policy);<a name="l00112"></a>00112 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> bufferIterations = policy.GetIterationsToBuffer();<a name="l00113"></a>00113 <a name="l00114"></a>00114 <span class="keywordflow">while</span> (length >= bufferByteSize)<a name="l00115"></a>00115 {<a name="l00116"></a>00116 policy.WriteKeystream(<a class="code" href="class_additive_cipher_template.html#dc071d835c1113d83a98ca62b09f0904">m_buffer</a>, bufferIterations);<a name="l00117"></a>00117 xorbuf(outString, inString, <a class="code" href="class_additive_cipher_template.html#a0b80a8012abd9061b9522102737069b">KeystreamBufferBegin</a>(), bufferByteSize);<a name="l00118"></a>00118 length -= bufferByteSize;<a name="l00119"></a>00119 inString += bufferByteSize;<a name="l00120"></a>00120 outString += bufferByteSize;<a name="l00121"></a>00121 }⌨️ 快捷键说明
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