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cryptopp-doc-5.6.1-0.1.svn479.fc13.i686.rpm

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<h1>hmac.h</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// hmac.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_HMAC_H</span>
<a name="l00004"></a>00004 <span class="preprocessor"></span><span class="preprocessor">#define CRYPTOPP_HMAC_H</span>
<a name="l00005"></a>00005 <span class="preprocessor"></span>
<a name="l00006"></a>00006 <span class="preprocessor">#include &quot;seckey.h&quot;</span>
<a name="l00007"></a>00007 <span class="preprocessor">#include &quot;secblock.h&quot;</span>
<a name="l00008"></a>00008 
<a name="l00009"></a>00009 NAMESPACE_BEGIN(CryptoPP)
<a name="l00010"></a>00010 
<a name="l00011"></a>00011 <span class="comment">//! _</span>
<a name="l00012"></a><a class="code" href="class_h_m_a_c___base.html">00012</a> <span class="comment"></span>class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE <a class="code" href="class_h_m_a_c___base.html" title="_">HMAC_Base</a> : public <a class="code" href="class_variable_key_length.html" title="support query of variable key length, template parameters are default, min, max,...">VariableKeyLength</a>&lt;16, 0, INT_MAX&gt;, public <a class="code" href="class_message_authentication_code.html" title="interface for message authentication codes">MessageAuthenticationCode</a>
<a name="l00013"></a>00013 {
<a name="l00014"></a>00014 <span class="keyword">public</span>:
<a name="l00015"></a>00015         <a class="code" href="class_h_m_a_c___base.html" title="_">HMAC_Base</a>() : m_innerHashKeyed(<span class="keyword">false</span>) {}
<a name="l00016"></a>00016         <span class="keywordtype">void</span> UncheckedSetKey(<span class="keyword">const</span> byte *userKey, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> keylength, <span class="keyword">const</span> <a class="code" href="class_name_value_pairs.html" title="interface for retrieving values given their names">NameValuePairs</a> &amp;params);
<a name="l00017"></a>00017 
<a name="l00018"></a>00018         <span class="keywordtype">void</span> Restart();
<a name="l00019"></a>00019         <span class="keywordtype">void</span> Update(<span class="keyword">const</span> byte *input, <span class="keywordtype">size_t</span> length);
<a name="l00020"></a>00020         <span class="keywordtype">void</span> TruncatedFinal(byte *mac, <span class="keywordtype">size_t</span> size);
<a name="l00021"></a><a class="code" href="class_h_m_a_c___base.html#aff95ee2467f75accc29644b77f7ce781">00021</a>         <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code" href="class_h_m_a_c___base.html#aff95ee2467f75accc29644b77f7ce781" title="input to Update() should have length a multiple of this for optimal speed">OptimalBlockSize</a>()<span class="keyword"> const </span>{<span class="keywordflow">return</span> <span class="keyword">const_cast&lt;</span><a class="code" href="class_h_m_a_c___base.html" title="_">HMAC_Base</a>*<span class="keyword">&gt;</span>(<span class="keyword">this</span>)-&gt;AccessHash().OptimalBlockSize();}
<a name="l00022"></a><a class="code" href="class_h_m_a_c___base.html#a4b3ee793dee4bf86a16fe18326db20e6">00022</a>         <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code" href="class_h_m_a_c___base.html#a4b3ee793dee4bf86a16fe18326db20e6" title="size of the hash/digest/MAC returned by Final()">DigestSize</a>()<span class="keyword"> const </span>{<span class="keywordflow">return</span> <span class="keyword">const_cast&lt;</span><a class="code" href="class_h_m_a_c___base.html" title="_">HMAC_Base</a>*<span class="keyword">&gt;</span>(<span class="keyword">this</span>)-&gt;AccessHash().DigestSize();}
<a name="l00023"></a>00023 
<a name="l00024"></a>00024 <span class="keyword">protected</span>:
<a name="l00025"></a>00025         <span class="keyword">virtual</span> <a class="code" href="class_hash_transformation.html" title="interface for hash functions and data processing part of MACs">HashTransformation</a> &amp; AccessHash() =0;
<a name="l00026"></a>00026         byte * AccessIpad() {<span class="keywordflow">return</span> m_buf;}
<a name="l00027"></a>00027         byte * AccessOpad() {<span class="keywordflow">return</span> m_buf + AccessHash().BlockSize();}
<a name="l00028"></a>00028         byte * AccessInnerHash() {<span class="keywordflow">return</span> m_buf + 2*AccessHash().BlockSize();}
<a name="l00029"></a>00029 
<a name="l00030"></a>00030 <span class="keyword">private</span>:
<a name="l00031"></a>00031         <span class="keywordtype">void</span> KeyInnerHash();
<a name="l00032"></a>00032 
<a name="l00033"></a>00033         <a class="code" href="class_sec_block.html" title="a block of memory allocated using A">SecByteBlock</a> m_buf;
<a name="l00034"></a>00034         <span class="keywordtype">bool</span> m_innerHashKeyed;
<a name="l00035"></a>00035 };
<a name="l00036"></a>00036 <span class="comment"></span>
<a name="l00037"></a>00037 <span class="comment">//! &lt;a href=&quot;http://www.weidai.com/scan-mirror/mac.html#HMAC&quot;&gt;HMAC&lt;/a&gt;</span>
<a name="l00038"></a>00038 <span class="comment"></span><span class="comment">/*! HMAC(K, text) = H(K XOR opad, H(K XOR ipad, text)) */</span>
<a name="l00039"></a>00039 <span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt;
<a name="l00040"></a><a class="code" href="class_h_m_a_c.html">00040</a> <span class="keyword">class </span><a class="code" href="class_h_m_a_c.html" title="HMAC">HMAC</a> : <span class="keyword">public</span> <a class="code" href="class_message_authentication_code_impl.html" title="_">MessageAuthenticationCodeImpl</a>&lt;HMAC_Base, HMAC&lt;T&gt; &gt;
<a name="l00041"></a>00041 {
<a name="l00042"></a>00042 <span class="keyword">public</span>:
<a name="l00043"></a>00043         CRYPTOPP_CONSTANT(DIGESTSIZE=T::DIGESTSIZE)
<a name="l00044"></a>00044         CRYPTOPP_CONSTANT(BLOCKSIZE=T::BLOCKSIZE)
<a name="l00045"></a>00045 
<a name="l00046"></a>00046         <a class="code" href="class_h_m_a_c.html" title="HMAC">HMAC</a>() {}
<a name="l00047"></a>00047         <a class="code" href="class_h_m_a_c.html" title="HMAC">HMAC</a>(<span class="keyword">const</span> byte *key, <span class="keywordtype">size_t</span> length=HMAC_Base::DEFAULT_KEYLENGTH)
<a name="l00048"></a>00048                 {this-&gt;<a class="code" href="class_simple_keying_interface.html#adf3c29b3ef3af74788a58c7c49887fd7" title="set or reset the key of this object">SetKey</a>(key, length);}
<a name="l00049"></a>00049 
<a name="l00050"></a>00050         <span class="keyword">static</span> std::string StaticAlgorithmName() {<span class="keywordflow">return</span> std::string(<span class="stringliteral">&quot;HMAC(&quot;</span>) + T::StaticAlgorithmName() + <span class="stringliteral">&quot;)&quot;</span>;}
<a name="l00051"></a><a class="code" href="class_h_m_a_c.html#a95712a54fd2506f31cc5cb26e86dd658">00051</a>         std::string <a class="code" href="class_h_m_a_c.html#a95712a54fd2506f31cc5cb26e86dd658" title="returns name of this algorithm, not universally implemented yet">AlgorithmName</a>()<span class="keyword"> const </span>{<span class="keywordflow">return</span> std::string(<span class="stringliteral">&quot;HMAC(&quot;</span>) + m_hash.AlgorithmName() + <span class="stringliteral">&quot;)&quot;</span>;}
<a name="l00052"></a>00052 
<a name="l00053"></a>00053 <span class="keyword">private</span>:
<a name="l00054"></a>00054         <a class="code" href="class_hash_transformation.html" title="interface for hash functions and data processing part of MACs">HashTransformation</a> &amp; AccessHash() {<span class="keywordflow">return</span> m_hash;}
<a name="l00055"></a>00055 
<a name="l00056"></a>00056         T m_hash;
<a name="l00057"></a>00057 };
<a name="l00058"></a>00058 
<a name="l00059"></a>00059 NAMESPACE_END
<a name="l00060"></a>00060 
<a name="l00061"></a>00061 <span class="preprocessor">#endif</span>
</pre></div></div>
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