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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++: mdc.h 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>mdc.h</h1><a href="mdc_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// mdc.h - written and placed in the public domain by Wei Dai</span><a name="l00002"></a>00002 <a name="l00003"></a>00003 <span class="preprocessor">#ifndef CRYPTOPP_MDC_H</span><a name="l00004"></a>00004 <span class="preprocessor"></span><span class="preprocessor">#define CRYPTOPP_MDC_H</span><a name="l00005"></a>00005 <span class="preprocessor"></span><span class="comment"></span><a name="l00006"></a>00006 <span class="comment">/** \file</span><a name="l00007"></a>00007 <span class="comment">*/</span><a name="l00008"></a>00008 <a name="l00009"></a>00009 <span class="preprocessor">#include "seckey.h"</span><a name="l00010"></a>00010 <span class="preprocessor">#include "misc.h"</span><a name="l00011"></a>00011 <a name="l00012"></a>00012 NAMESPACE_BEGIN(CryptoPP)<a name="l00013"></a>00013 <a name="l00014"></a>00014 <span class="comment">//! _</span><a name="l00015"></a>00015 <span class="comment"></span>template <class T><a name="l00016"></a><a class="code" href="struct_m_d_c___info.html">00016</a> struct <a class="code" href="struct_m_d_c___info.html" title="_">MDC_Info</a> : public <a class="code" href="class_fixed_block_size.html" title="to be inherited by block ciphers with fixed block size">FixedBlockSize</a><T::DIGESTSIZE>, public <a class="code" href="class_fixed_key_length.html" title="to be inherited by keyed algorithms with fixed key length">FixedKeyLength</a><T::BLOCKSIZE><a name="l00017"></a>00017 {<a name="l00018"></a><a class="code" href="struct_m_d_c___info.html#b543405d9cb03df225ccbd57b419862f">00018</a> <span class="keyword">static</span> std::string StaticAlgorithmName() {<span class="keywordflow">return</span> std::string(<span class="stringliteral">"MDC/"</span>)+T::StaticAlgorithmName();}<a name="l00019"></a>00019 };<a name="l00020"></a>00020 <span class="comment"></span><a name="l00021"></a>00021 <span class="comment">//! <a href="http://www.weidai.com/scan-mirror/cs.html#MDC">MDC</a></span><a name="l00022"></a>00022 <span class="comment"></span><span class="comment">/*! a construction by Peter Gutmann to turn an iterated hash function into a PRF */</span><a name="l00023"></a>00023 <span class="keyword">template</span> <<span class="keyword">class</span> T><a name="l00024"></a><a class="code" href="class_m_d_c.html">00024</a> <span class="keyword">class </span><a class="code" href="class_m_d_c.html" title="MDC">MDC</a> : <span class="keyword">public</span> <a class="code" href="struct_m_d_c___info.html" title="_">MDC_Info</a><T><a name="l00025"></a>00025 {<a name="l00026"></a>00026 <span class="keyword">class </span>CRYPTOPP_NO_VTABLE Enc : <span class="keyword">public</span> <a class="code" href="class_block_cipher_impl.html">BlockCipherImpl</a><MDC_Info<T> ><a name="l00027"></a>00027 {<a name="l00028"></a>00028 <span class="keyword">typedef</span> <span class="keyword">typename</span> T::HashWordType HashWordType;<a name="l00029"></a>00029 <a name="l00030"></a>00030 <span class="keyword">public</span>:<a name="l00031"></a>00031 <span class="keywordtype">void</span> UncheckedSetKey(<span class="keyword">const</span> byte *userKey, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> length, <span class="keyword">const</span> <a class="code" href="class_name_value_pairs.html" title="interface for retrieving values given their names">NameValuePairs</a> &params)<a name="l00032"></a>00032 {<a name="l00033"></a>00033 this->AssertValidKeyLength(length);<a name="l00034"></a>00034 memcpy_s(m_key, m_key.size(), userKey, this-><a class="code" href="class_fixed_key_length.html#b994d881a105849f64a973373e8f282c">KEYLENGTH</a>);<a name="l00035"></a>00035 T::CorrectEndianess(Key(), Key(), this->KEYLENGTH);<a name="l00036"></a>00036 }<a name="l00037"></a>00037 <a name="l00038"></a>00038 <span class="keywordtype">void</span> ProcessAndXorBlock(<span class="keyword">const</span> byte *inBlock, <span class="keyword">const</span> byte *xorBlock, byte *outBlock)<span class="keyword"> const</span><a name="l00039"></a>00039 <span class="keyword"> </span>{<a name="l00040"></a>00040 T::CorrectEndianess(Buffer(), (HashWordType *)inBlock, this->BLOCKSIZE);<a name="l00041"></a>00041 T::Transform(Buffer(), Key());<a name="l00042"></a>00042 <span class="keywordflow">if</span> (xorBlock)<a name="l00043"></a>00043 {<a name="l00044"></a>00044 T::CorrectEndianess(Buffer(), Buffer(), this->BLOCKSIZE);<a name="l00045"></a>00045 xorbuf(outBlock, xorBlock, m_buffer, this->BLOCKSIZE);<a name="l00046"></a>00046 }<a name="l00047"></a>00047 <span class="keywordflow">else</span><a name="l00048"></a>00048 T::CorrectEndianess((HashWordType *)outBlock, Buffer(), this->BLOCKSIZE);<a name="l00049"></a>00049 }<a name="l00050"></a>00050 <a name="l00051"></a>00051 <span class="keywordtype">bool</span> IsPermutation()<span class="keyword"> const </span>{<span class="keywordflow">return</span> <span class="keyword">false</span>;}<a name="l00052"></a>00052 <a name="l00053"></a>00053 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> GetAlignment()<span class="keyword"> const </span>{<span class="keywordflow">return</span> <span class="keyword">sizeof</span>(HashWordType);}<a name="l00054"></a>00054 <a name="l00055"></a>00055 <span class="keyword">private</span>:<a name="l00056"></a>00056 HashWordType *Key() {<span class="keywordflow">return</span> (HashWordType *)m_key.data();}<a name="l00057"></a>00057 <span class="keyword">const</span> HashWordType *Key()<span class="keyword"> const </span>{<span class="keywordflow">return</span> (<span class="keyword">const</span> HashWordType *)m_key.data();}<a name="l00058"></a>00058 HashWordType *Buffer()<span class="keyword"> const </span>{<span class="keywordflow">return</span> (HashWordType *)m_buffer.data();}<a name="l00059"></a>00059 <a name="l00060"></a>00060 <span class="comment">// VC60 workaround: bug triggered if using FixedSizeAllocatorWithCleanup</span><a name="l00061"></a>00061 <a class="code" href="class_fixed_size_sec_block.html" title="a SecBlock with fixed size, allocated statically">FixedSizeSecBlock<byte, MDC_Info<T>::KEYLENGTH</a>, <a class="code" href="class_allocator_with_cleanup.html">AllocatorWithCleanup<byte></a> > m_key;<a name="l00062"></a>00062 <span class="keyword">mutable</span> <a class="code" href="class_fixed_size_sec_block.html" title="a SecBlock with fixed size, allocated statically">FixedSizeSecBlock<byte, MDC_Info<T>::BLOCKSIZE</a>, <a class="code" href="class_allocator_with_cleanup.html">AllocatorWithCleanup<byte></a> > m_buffer;<a name="l00063"></a>00063 };<a name="l00064"></a>00064 <a name="l00065"></a>00065 <span class="keyword">public</span>:<span class="comment"></span><a name="l00066"></a>00066 <span class="comment"> //! use BlockCipher interface</span><a name="l00067"></a><a class="code" href="class_m_d_c.html#926e1a361c55ba954c031656cb2e9b4a">00067</a> <span class="comment"></span> <span class="keyword">typedef</span> <a class="code" href="class_block_cipher_final.html" title="_">BlockCipherFinal<ENCRYPTION, Enc></a> <a class="code" href="class_block_cipher_final.html">Encryption</a>;<a name="l00068"></a>00068 };<a name="l00069"></a>00069 <a name="l00070"></a>00070 NAMESPACE_END<a name="l00071"></a>00071 <a name="l00072"></a>00072 <span class="preprocessor">#endif</span></pre></div><hr size="1"><address style="text-align: right;"><small>Generated on Fri Jun 1 11:11:22 2007 for Crypto++ by <a href="http://www.doxygen.org/index.html"><img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.2 </small></address></body></html>⌨️ 快捷键说明
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