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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++: trunhash.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>trunhash.h</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="preprocessor">#ifndef CRYPTOPP_TRUNHASH_H</span><a name="l00002"></a>00002 <span class="preprocessor"></span><span class="preprocessor">#define CRYPTOPP_TRUNHASH_H</span><a name="l00003"></a>00003 <span class="preprocessor"></span><a name="l00004"></a>00004 <span class="preprocessor">#include "<a class="code" href="cryptlib_8h.html">cryptlib.h</a>"</span><a name="l00005"></a>00005 <a name="l00006"></a>00006 NAMESPACE_BEGIN(CryptoPP)<a name="l00007"></a>00007 <a name="l00008"></a><a class="code" href="class_null_hash.html">00008</a> class <a class="code" href="class_null_hash.html">NullHash</a> : public <a class="code" href="class_hash_transformation.html" title="interface for hash functions and data processing part of MACs">HashTransformation</a><a name="l00009"></a>00009 {<a name="l00010"></a>00010 <span class="keyword">public</span>:<a name="l00011"></a><a class="code" href="class_null_hash.html#c18fc7f331dd116f1a38aea97c0ea100">00011</a> <span class="keywordtype">void</span> Update(<span class="keyword">const</span> byte *input, <span class="keywordtype">size_t</span> length) {}<a name="l00012"></a><a class="code" href="class_null_hash.html#5ed419d00be90042dcb7225dbf5534e8">00012</a> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> DigestSize()<span class="keyword"> const </span>{<span class="keywordflow">return</span> 0;}<a name="l00013"></a><a class="code" href="class_null_hash.html#ba7565b459a86274e0958230e72ddee2">00013</a> <span class="keywordtype">void</span> TruncatedFinal(byte *digest, <span class="keywordtype">size_t</span> digestSize) {}<a name="l00014"></a><a class="code" href="class_null_hash.html#b18ad3278ce23ea6b1d4f6394d31ae19">00014</a> <span class="keywordtype">bool</span> TruncatedVerify(<span class="keyword">const</span> byte *digest, <span class="keywordtype">size_t</span> digestLength) {<span class="keywordflow">return</span> <span class="keyword">true</span>;}<a name="l00015"></a>00015 };<a name="l00016"></a>00016 <span class="comment"></span><a name="l00017"></a>00017 <span class="comment">//! construct new HashModule with smaller DigestSize() from existing one</span><a name="l00018"></a>00018 <span class="comment"></span><span class="keyword">template</span> <<span class="keyword">class</span> T><a name="l00019"></a><a class="code" href="class_truncated_hash_template.html">00019</a> <span class="keyword">class </span><a class="code" href="class_truncated_hash_template.html" title="construct new HashModule with smaller DigestSize() from existing one">TruncatedHashTemplate</a> : <span class="keyword">public</span> <a class="code" href="class_hash_transformation.html" title="interface for hash functions and data processing part of MACs">HashTransformation</a><a name="l00020"></a>00020 {<a name="l00021"></a>00021 <span class="keyword">public</span>:<a name="l00022"></a><a class="code" href="class_truncated_hash_template.html#b1cc7657479c262a5ecb5f5d4af8917b">00022</a> <a class="code" href="class_truncated_hash_template.html#b1cc7657479c262a5ecb5f5d4af8917b">TruncatedHashTemplate</a>(T hm, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> digestSize)<a name="l00023"></a>00023 : m_hm(hm), m_digestSize(digestSize) {}<a name="l00024"></a><a class="code" href="class_truncated_hash_template.html#03c5bc7da3eebba8f5850d21ad0fe879">00024</a> <a class="code" href="class_truncated_hash_template.html#b1cc7657479c262a5ecb5f5d4af8917b">TruncatedHashTemplate</a>(<span class="keyword">const</span> byte *key, <span class="keywordtype">size_t</span> keyLength, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> digestSize)<a name="l00025"></a>00025 : m_hm(key, keyLength), m_digestSize(digestSize) {}<a name="l00026"></a><a class="code" href="class_truncated_hash_template.html#58cf3e759c44b8901b1f7b2aaece2aac">00026</a> <a class="code" href="class_truncated_hash_template.html#b1cc7657479c262a5ecb5f5d4af8917b">TruncatedHashTemplate</a>(<span class="keywordtype">size_t</span> digestSize)<a name="l00027"></a>00027 : m_digestSize(digestSize) {}<a name="l00028"></a>00028 <a name="l00029"></a><a class="code" href="class_truncated_hash_template.html#01af99665c10d2980a4e23555067cb5d">00029</a> <span class="keywordtype">void</span> <a class="code" href="class_truncated_hash_template.html#01af99665c10d2980a4e23555067cb5d" title="discard the current state, and restart with a new message">Restart</a>()<a name="l00030"></a>00030 {m_hm.Restart();}<a name="l00031"></a><a class="code" href="class_truncated_hash_template.html#3261842338107f4f641e493b0ceb037f">00031</a> <span class="keywordtype">void</span> <a class="code" href="class_truncated_hash_template.html#3261842338107f4f641e493b0ceb037f" title="process more input">Update</a>(<span class="keyword">const</span> byte *input, <span class="keywordtype">size_t</span> length)<a name="l00032"></a>00032 {m_hm.Update(input, length);}<a name="l00033"></a><a class="code" href="class_truncated_hash_template.html#0764e3c8769ca03dce548d896451a5ba">00033</a> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code" href="class_truncated_hash_template.html#0764e3c8769ca03dce548d896451a5ba" title="size of the hash returned by Final()">DigestSize</a>()<span class="keyword"> const </span>{<span class="keywordflow">return</span> m_digestSize;}<a name="l00034"></a><a class="code" href="class_truncated_hash_template.html#8d35821fad737aaa41c6ad0a01e56510">00034</a> <span class="keywordtype">void</span> <a class="code" href="class_truncated_hash_template.html#8d35821fad737aaa41c6ad0a01e56510" title="truncated version of Final()">TruncatedFinal</a>(byte *digest, <span class="keywordtype">size_t</span> digestSize)<a name="l00035"></a>00035 {m_hm.TruncatedFinal(digest, digestSize);}<a name="l00036"></a><a class="code" href="class_truncated_hash_template.html#eeae8ba7cae1d365551f156a5ff87c6d">00036</a> <span class="keywordtype">bool</span> <a class="code" href="class_truncated_hash_template.html#eeae8ba7cae1d365551f156a5ff87c6d" title="truncated version of Verify()">TruncatedVerify</a>(<span class="keyword">const</span> byte *digest, <span class="keywordtype">size_t</span> digestLength)<a name="l00037"></a>00037 {<span class="keywordflow">return</span> m_hm.TruncatedVerify(digest, digestLength);}<a name="l00038"></a>00038 <a name="l00039"></a>00039 <span class="keyword">private</span>:<a name="l00040"></a>00040 T m_hm;<a name="l00041"></a>00041 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> m_digestSize;<a name="l00042"></a>00042 };<a name="l00043"></a>00043 <a name="l00044"></a>00044 <span class="keyword">typedef</span> <a class="code" href="class_truncated_hash_template.html" title="construct new HashModule with smaller DigestSize() from existing one">TruncatedHashTemplate<HashTransformation &></a> <a class="code" href="class_truncated_hash_template.html" title="construct new HashModule with smaller DigestSize() from existing one">TruncatedHashModule</a>;<a name="l00045"></a>00045 <a name="l00046"></a>00046 NAMESPACE_END<a name="l00047"></a>00047 <a name="l00048"></a>00048 <span class="preprocessor">#endif</span></pre></div><hr size="1"><address style="text-align: right;"><small>Generated on Fri Jun 1 11:11:25 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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