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<h1>dmac.h</h1><pre class="fragment"><div>00001 <span class="preprocessor">#ifndef CRYPTOPP_DMAC_H</span>
00002 <span class="preprocessor"></span><span class="preprocessor">#define CRYPTOPP_DMAC_H</span>
00003 <span class="preprocessor"></span>
00004 <span class="preprocessor">#include "cbcmac.h"</span>
00005
00006 NAMESPACE_BEGIN(CryptoPP)
00007
00008 <span class="comment">//! _</span>
00009 <span class="comment"></span>template <class T>
<a name="l00010"></a><a class="code" href="class_d_m_a_c___base.html">00010</a> class CRYPTOPP_NO_VTABLE <a class="code" href="class_d_m_a_c___base.html">DMAC_Base</a> : public <a class="code" href="class_same_key_length_as.html">SameKeyLengthAs</a><T>, public <a class="code" href="class_message_authentication_code.html">MessageAuthenticationCode</a>
00011 {
00012 <span class="keyword">public</span>:
00013 <span class="keyword">static</span> std::string StaticAlgorithmName() {<span class="keywordflow">return</span> std::string(<span class="stringliteral">"DMAC("</span>) + T::StaticAlgorithmName() + <span class="stringliteral">")"</span>;}
00014
00015 <span class="keyword">enum</span> {DIGESTSIZE=T::BLOCKSIZE};
00016
00017 <a class="code" href="class_d_m_a_c___base.html">DMAC_Base</a>() {}
00018
00019 <span class="keywordtype">void</span> CheckedSetKey(<span class="keywordtype">void</span> *, Empty empty, <span class="keyword">const</span> byte *key, <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">NameValuePairs</a> &params);
00020 <span class="keywordtype">void</span> Update(<span class="keyword">const</span> byte *input, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> length);
00021 <span class="keywordtype">void</span> TruncatedFinal(byte *mac, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> size);
<a name="l00022"></a><a class="code" href="class_d_m_a_c___base.html#_simple_keying_interface_impl_3_01_d_m_a_c___base_3_01_t_01_4_00_01_d_m_a_c___base_3_01_t_01_4_01_4a8">00022</a> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> DigestSize()<span class="keyword"> const </span>{<span class="keywordflow">return</span> DIGESTSIZE;}
00023
00024 <span class="keyword">private</span>:
00025 byte *GenerateSubKeys(<span class="keyword">const</span> byte *key, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> keylength);
00026
00027 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> m_subkeylength;
00028 <a class="code" href="class_sec_block.html">SecByteBlock</a> m_subkeys;
00029 <a class="code" href="class_c_b_c___m_a_c.html">CBC_MAC<T></a> m_mac1;
00030 <span class="keyword">typename</span> T::Encryption m_f2;
00031 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> m_counter;
00032 };
00033 <span class="comment"></span>
00034 <span class="comment">//! DMAC</span>
00035 <span class="comment"></span><span class="comment">/*! Based on "CBC MAC for Real-Time Data Sources" by Erez Petrank</span>
00036 <span class="comment"> and Charles Rackoff. T should be a class derived from BlockCipherDocumentation.</span>
00037 <span class="comment">*/</span>
00038 <span class="keyword">template</span> <<span class="keyword">class</span> T>
<a name="l00039"></a><a class="code" href="class_d_m_a_c.html">00039</a> <span class="keyword">class </span><a class="code" href="class_d_m_a_c.html">DMAC</a> : <span class="keyword">public</span> <a class="code" href="class_message_authentication_code_final.html">MessageAuthenticationCodeFinal</a><DMAC_Base<T> >
00040 {
00041 <span class="keyword">public</span>:
00042 <a class="code" href="class_d_m_a_c.html">DMAC</a>() {}
00043 <a class="code" href="class_d_m_a_c.html">DMAC</a>(<span class="keyword">const</span> byte *key, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> length=<a class="code" href="class_d_m_a_c___base.html">DMAC_Base<T></a>::DEFAULT_KEYLENGTH)
00044 {this->SetKey(key, length);}
00045 };
00046
00047 <span class="keyword">template</span> <<span class="keyword">class</span> T>
00048 <span class="keywordtype">void</span> <a class="code" href="class_d_m_a_c___base.html">DMAC_Base<T>::CheckedSetKey</a>(<span class="keywordtype">void</span> *, Empty empty, <span class="keyword">const</span> byte *key, <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">NameValuePairs</a> &params)
00049 {
00050 m_subkeylength = T::StaticGetValidKeyLength(T::BLOCKSIZE);
00051 m_subkeys.resize(2*STDMAX((<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>)T::BLOCKSIZE, m_subkeylength));
00052 m_mac1.SetKey(GenerateSubKeys(key, length), m_subkeylength, params);
00053 m_f2.SetKey(m_subkeys+m_subkeys.size()/2, m_subkeylength, params);
00054 m_counter = 0;
00055 m_subkeys.resize(0);
00056 }
00057
00058 <span class="keyword">template</span> <<span class="keyword">class</span> T>
<a name="l00059"></a><a class="code" href="class_d_m_a_c___base.html#_simple_keying_interface_impl_3_01_d_m_a_c___base_3_01_t_01_4_00_01_d_m_a_c___base_3_01_t_01_4_01_4a6">00059</a> <span class="keywordtype">void</span> <a class="code" href="class_d_m_a_c___base.html">DMAC_Base<T>::Update</a>(<span class="keyword">const</span> byte *input, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> length)
00060 {
00061 m_mac1.Update(input, length);
00062 m_counter = (m_counter + length) % T::BLOCKSIZE;
00063 }
00064
00065 <span class="keyword">template</span> <<span class="keyword">class</span> T>
<a name="l00066"></a><a class="code" href="class_d_m_a_c___base.html#_simple_keying_interface_impl_3_01_d_m_a_c___base_3_01_t_01_4_00_01_d_m_a_c___base_3_01_t_01_4_01_4a7">00066</a> <span class="keywordtype">void</span> <a class="code" href="class_d_m_a_c___base.html">DMAC_Base<T>::TruncatedFinal</a>(byte *mac, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> size)
00067 {
00068 ThrowIfInvalidTruncatedSize(size);
00069
00070 byte pad[T::BLOCKSIZE];
00071 byte padByte = byte(T::BLOCKSIZE-m_counter);
00072 memset(pad, padByte, padByte);
00073 m_mac1.Update(pad, padByte);
00074 m_mac1.TruncatedFinal(mac, size);
00075 m_f2.ProcessBlock(mac);
00076 }
00077
00078 <span class="keyword">template</span> <<span class="keyword">class</span> T>
00079 byte *<a class="code" href="class_d_m_a_c___base.html">DMAC_Base<T>::GenerateSubKeys</a>(<span class="keyword">const</span> byte *key, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> keylength)
00080 {
00081 <span class="keyword">typename</span> T::Encryption cipher(key, keylength);
00082 memset(m_subkeys, 0, m_subkeys.<a class="code" href="class_sec_block.html#_sec_block_with_hinta15">size</a>());
00083 cipher.ProcessBlock(m_subkeys);
00084 m_subkeys[m_subkeys.<a class="code" href="class_sec_block.html#_sec_block_with_hinta15">size</a>()/2 + T::BLOCKSIZE - 1] = 1;
00085 cipher.ProcessBlock(m_subkeys+m_subkeys.<a class="code" href="class_sec_block.html#_sec_block_with_hinta15">size</a>()/2);
00086 <span class="keywordflow">return</span> m_subkeys;
00087 }
00088
00089 NAMESPACE_END
00090
00091 <span class="preprocessor">#endif</span>
</div></pre><hr size="1"><address style="align: right;"><small>Generated on Sun Nov 7 08:23:57 2004 for Crypto++ by
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