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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++: hmac.cpp 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 Page</a> | <a class="qindex" href="namespaces.html">Namespace List</a> | <a class="qindex" href="hierarchy.html">Class Hierarchy</a> | <a class="qindex" href="classes.html">Alphabetical List</a> | <a class="qindex" href="annotated.html">Compound List</a> | <a class="qindex" href="files.html">File List</a> | <a class="qindex" href="namespacemembers.html">Namespace Members</a> | <a class="qindex" href="functions.html">Compound Members</a> | <a class="qindex" href="globals.html">File Members</a></div><h1>hmac.cpp</h1><div class="fragment"><pre>00001 <span class="comment">// hmac.cpp - written and placed in the public domain by Wei Dai</span>00002 00003 <span class="preprocessor">#include "pch.h"</span>00004 00005 <span class="preprocessor">#ifndef CRYPTOPP_IMPORTS</span>00006 <span class="preprocessor"></span>00007 <span class="preprocessor">#include "hmac.h"</span>00008 00009 NAMESPACE_BEGIN(CryptoPP)00010 00011 <span class="keywordtype">void</span> HMAC_Base::UncheckedSetKey(<span class="keyword">const</span> byte *userKey, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> keylength)00012 {00013 AssertValidKeyLength(keylength);00014 00015 Restart();00016 00017 <a class="code" href="class_hash_transformation.html">HashTransformation</a> &hash = AccessHash();00018 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> blockSize = hash.<a class="code" href="class_hash_transformation.html#_x_m_a_c_ca10">BlockSize</a>();00019 00020 <span class="keywordflow">if</span> (!blockSize)00021 <span class="keywordflow">throw</span> <a class="code" href="class_invalid_argument.html">InvalidArgument</a>(<span class="stringliteral">"HMAC: can only be used with a block-based hash function"</span>);00022 00023 <span class="keywordflow">if</span> (keylength <= blockSize)00024 memcpy(AccessIpad(), userKey, keylength);00025 <span class="keywordflow">else</span>00026 {00027 AccessHash().<a class="code" href="class_hash_transformation.html#_x_m_a_c_c___basea14">CalculateDigest</a>(AccessIpad(), userKey, keylength);00028 keylength = hash.<a class="code" href="class_hash_transformation.html#_x_m_a_c_ca9">DigestSize</a>();00029 }00030 00031 assert(keylength <= blockSize);00032 memset(AccessIpad()+keylength, 0, blockSize-keylength);00033 00034 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=0; i<blockSize; i++)00035 {00036 AccessOpad()[i] = AccessIpad()[i] ^ OPAD;00037 AccessIpad()[i] ^= IPAD;00038 }00039 }00040 00041 <span class="keywordtype">void</span> HMAC_Base::KeyInnerHash()00042 {00043 assert(!m_innerHashKeyed);00044 <a class="code" href="class_hash_transformation.html">HashTransformation</a> &hash = AccessHash();00045 hash.<a class="code" href="class_hash_transformation.html#_x_m_a_c_ca5">Update</a>(AccessIpad(), hash.<a class="code" href="class_hash_transformation.html#_x_m_a_c_ca10">BlockSize</a>());00046 m_innerHashKeyed = <span class="keyword">true</span>;00047 }00048 00049 <span class="keywordtype">void</span> HMAC_Base::Restart()00050 {00051 <span class="keywordflow">if</span> (m_innerHashKeyed)00052 {00053 AccessHash().<a class="code" href="class_hash_transformation.html#_x_m_a_c_ca8">Restart</a>();00054 m_innerHashKeyed = <span class="keyword">false</span>;00055 }00056 }00057 00058 <span class="keywordtype">void</span> HMAC_Base::Update(<span class="keyword">const</span> byte *input, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> length)00059 {00060 <span class="keywordflow">if</span> (!m_innerHashKeyed)00061 KeyInnerHash();00062 AccessHash().<a class="code" href="class_hash_transformation.html#_x_m_a_c_ca5">Update</a>(input, length);00063 }00064 00065 <span class="keywordtype">void</span> HMAC_Base::TruncatedFinal(byte *mac, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> size)00066 {00067 ThrowIfInvalidTruncatedSize(size);00068 00069 <a class="code" href="class_hash_transformation.html">HashTransformation</a> &hash = AccessHash();00070 00071 <span class="keywordflow">if</span> (!m_innerHashKeyed)00072 KeyInnerHash();00073 hash.<a class="code" href="class_hash_transformation.html#_x_m_a_c_c___basea13">Final</a>(AccessInnerHash());00074 00075 hash.<a class="code" href="class_hash_transformation.html#_x_m_a_c_ca5">Update</a>(AccessOpad(), hash.<a class="code" href="class_hash_transformation.html#_x_m_a_c_ca10">BlockSize</a>());00076 hash.<a class="code" href="class_hash_transformation.html#_x_m_a_c_ca5">Update</a>(AccessInnerHash(), hash.<a class="code" href="class_hash_transformation.html#_x_m_a_c_ca9">DigestSize</a>());00077 hash.<a class="code" href="class_hash_transformation.html#_x_m_a_c_ca15">TruncatedFinal</a>(mac, size);00078 00079 m_innerHashKeyed = <span class="keyword">false</span>;00080 }00081 00082 NAMESPACE_END00083 00084 <span class="preprocessor">#endif</span></pre></div><hr size="1"><address style="align: right;"><small>Generated on Tue Jul 8 23:34:16 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>⌨️ 快捷键说明
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