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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>Crypto++: trunhash.h Source File</title><link href="doxygen.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.3.2 --><div class="qindex"><a class="qindex" href="index.html">Main&nbsp;Page</a> | <a class="qindex" href="namespaces.html">Namespace List</a> | <a class="qindex" href="hierarchy.html">Class&nbsp;Hierarchy</a> | <a class="qindex" href="classes.html">Alphabetical&nbsp;List</a> | <a class="qindex" href="annotated.html">Compound&nbsp;List</a> | <a class="qindex" href="files.html">File&nbsp;List</a> | <a class="qindex" href="namespacemembers.html">Namespace&nbsp;Members</a> | <a class="qindex" href="functions.html">Compound&nbsp;Members</a> | <a class="qindex" href="globals.html">File&nbsp;Members</a></div><h1>trunhash.h</h1><div class="fragment"><pre>00001 <span class="preprocessor">#ifndef CRYPTOPP_TRUNHASH_H</span>00002 <span class="preprocessor"></span><span class="preprocessor">#define CRYPTOPP_TRUNHASH_H</span>00003 <span class="preprocessor"></span>00004 <span class="preprocessor">#include "<a class="code" href="cryptlib_8h.html">cryptlib.h</a>"</span>00005 00006 NAMESPACE_BEGIN(CryptoPP)00007 00008 <span class="keyword">class </span>NullHash : <span class="keyword">public</span> <a class="code" href="class_hash_transformation.html">HashTransformation</a>00009 {00010 <span class="keyword">public</span>:00011         <span class="keywordtype">void</span> Update(<span class="keyword">const</span> byte *input, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> length) {}00012         <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> DigestSize()<span class="keyword"> const </span>{<span class="keywordflow">return</span> 0;}00013         <span class="keywordtype">void</span> TruncatedFinal(byte *digest, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> digestSize) {}00014         <span class="keywordtype">bool</span> TruncatedVerify(<span class="keyword">const</span> byte *digest, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> digestLength) {<span class="keywordflow">return</span> <span class="keyword">true</span>;}00015 };00016 <span class="comment"></span>00017 <span class="comment">//! construct new HashModule with smaller DigestSize() from existing one</span>00018 <span class="comment"></span><span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt;<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">TruncatedHashTemplate</a> : <span class="keyword">public</span> <a class="code" href="class_hash_transformation.html">HashTransformation</a>00020 {00021 <span class="keyword">public</span>:00022         <a class="code" href="class_truncated_hash_template.html">TruncatedHashTemplate</a>(T hm, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> digestSize)00023                 : m_hm(hm), m_digestSize(digestSize) {}00024         <a class="code" href="class_truncated_hash_template.html">TruncatedHashTemplate</a>(<span class="keyword">const</span> byte *key, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> keyLength, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> digestSize)00025                 : m_hm(key, keyLength), m_digestSize(digestSize) {}00026         <a class="code" href="class_truncated_hash_template.html">TruncatedHashTemplate</a>(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> digestSize)00027                 : m_digestSize(digestSize) {}00028 <a name="l00029"></a><a class="code" href="class_truncated_hash_template.html#_truncated_hash_templatea3">00029</a>         <span class="keywordtype">void</span> <a class="code" href="class_truncated_hash_template.html#_truncated_hash_templatea3">Update</a>(<span class="keyword">const</span> byte *input, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> length)00030                 {m_hm.Update(input, length);}<a name="l00031"></a><a class="code" href="class_truncated_hash_template.html#_truncated_hash_templatea4">00031</a>         <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code" href="class_truncated_hash_template.html#_truncated_hash_templatea4">DigestSize</a>()<span class="keyword"> const </span>{<span class="keywordflow">return</span> m_digestSize;}<a name="l00032"></a><a class="code" href="class_truncated_hash_template.html#_truncated_hash_templatea5">00032</a>         <span class="keywordtype">void</span> <a class="code" href="class_truncated_hash_template.html#_truncated_hash_templatea5">TruncatedFinal</a>(byte *digest, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> digestSize)00033                 {m_hm.TruncatedFinal(digest, digestSize);}<a name="l00034"></a><a class="code" href="class_truncated_hash_template.html#_truncated_hash_templatea6">00034</a>         <span class="keywordtype">bool</span> <a class="code" href="class_truncated_hash_template.html#_truncated_hash_templatea6">TruncatedVerify</a>(<span class="keyword">const</span> byte *digest, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> digestLength)00035                 {<span class="keywordflow">return</span> m_hm.TruncatedVerify(digest, digestLength);}00036 00037 <span class="keyword">private</span>:00038         T m_hm;00039         <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> m_digestSize;00040 };00041 00042 <span class="keyword">typedef</span> <a class="code" href="class_truncated_hash_template.html">TruncatedHashTemplate&lt;HashTransformation &amp;&gt;</a> <a class="code" href="class_truncated_hash_template.html">TruncatedHashModule</a>;00043 00044 NAMESPACE_END00045 00046 <span class="preprocessor">#endif</span></pre></div><hr size="1"><address style="align: right;"><small>Generated on Tue Jul 8 23:34:27 2003 for Crypto++ by<a href="http://www.doxygen.org/index.html"><img src="doxygen.png" alt="doxygen" align="middle" border=0 > </a>1.3.2 </small></address></body></html>
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