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 <span id="projectnumber">7.0</span>
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<div id="projectbrief">Free C++ class library of cryptographic schemes</div>
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<div class="title">cbcmac.cpp</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="preprocessor">#include "<a class="code" href="pch_8h.html">pch.h</a>"</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> </div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="preprocessor">#ifndef CRYPTOPP_IMPORTS</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> </div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="preprocessor">#include "<a class="code" href="cbcmac_8h.html">cbcmac.h</a>"</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> </div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> NAMESPACE_BEGIN(<a class="code" href="namespace_crypto_p_p.html">CryptoPP</a>)</div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> </div><div class="line"><a name="l00009"></a><span class="lineno"><a class="line" href="class_c_b_c___m_a_c___base.html#ae20a7dda2bc350e34de851dee4ff81ea"> 9</a></span> void <a class="code" href="class_c_b_c___m_a_c___base.html">CBC_MAC_Base</a>::UncheckedSetKey(const <span class="keywordtype">byte</span> *key, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> length, const <a class="code" href="class_name_value_pairs.html">NameValuePairs</a> &params)</div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> {</div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span>  AccessCipher().<a class="code" href="class_simple_keying_interface.html#adf3c29b3ef3af74788a58c7c49887fd7">SetKey</a>(key, length, params);</div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span>  m_reg.CleanNew(AccessCipher().<a class="code" href="namespace_name.html#aa93e40d0259a59959d270e6c82a9f1eb">BlockSize</a>());</div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span>  m_counter = 0;</div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> }</div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> </div><div class="line"><a name="l00016"></a><span class="lineno"><a class="line" href="class_c_b_c___m_a_c___base.html#af4b9ad28defd9ff98d86f0d6de2f4cf0"> 16</a></span> <span class="keywordtype">void</span> <a class="code" href="class_c_b_c___m_a_c___base.html#af4b9ad28defd9ff98d86f0d6de2f4cf0">CBC_MAC_Base::Update</a>(<span class="keyword">const</span> <span class="keywordtype">byte</span> *input, <span class="keywordtype">size_t</span> length)</div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> {</div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> blockSize = AccessCipher().<a class="code" href="class_block_transformation.html#adfdb78b033996020435c3dcffdca76ce">BlockSize</a>();</div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> </div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span>  <span class="keywordflow">while</span> (m_counter && length)</div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  {</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  m_reg[m_counter++] ^= *input++;</div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  <span class="keywordflow">if</span> (m_counter == blockSize)</div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  ProcessBuf();</div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  length--;</div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  }</div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> </div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  <span class="keywordflow">if</span> (length >= blockSize)</div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  {</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  <span class="keywordtype">size_t</span> leftOver = AccessCipher().<a class="code" href="class_block_transformation.html#a73ad0afb596da5f7e1f26ddf47394afb">AdvancedProcessBlocks</a>(m_reg, input, m_reg, length, <a class="code" href="class_block_transformation.html#adec6c003f0e1539c0a9da64e2d17352dab4c0ce98fee079d801069d4252f6c345">BlockTransformation::BT_DontIncrementInOutPointers</a>|<a class="code" href="class_block_transformation.html#adec6c003f0e1539c0a9da64e2d17352da692d5da11e5444e32f6e4e091623eaab">BlockTransformation::BT_XorInput</a>);</div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  input += (length - leftOver);</div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  length = leftOver;</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  }</div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> </div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <span class="keywordflow">while</span> (length--)</div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  {</div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  m_reg[m_counter++] ^= *input++;</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="keywordflow">if</span> (m_counter == blockSize)</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  ProcessBuf();</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  }</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> }</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> </div><div class="line"><a name="l00043"></a><span class="lineno"><a class="line" href="class_c_b_c___m_a_c___base.html#a50c5a8fc6a2926485295bbe72bcfe4d8"> 43</a></span> <span class="keywordtype">void</span> <a class="code" href="class_c_b_c___m_a_c___base.html#a50c5a8fc6a2926485295bbe72bcfe4d8">CBC_MAC_Base::TruncatedFinal</a>(<span class="keywordtype">byte</span> *mac, <span class="keywordtype">size_t</span> size)</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> {</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  ThrowIfInvalidTruncatedSize(size);</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span> </div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="keywordflow">if</span> (m_counter)</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  ProcessBuf();</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> </div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  memcpy(mac, m_reg, size);</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  memset(m_reg, 0, AccessCipher().<a class="code" href="class_hash_transformation.html#a09c66b86bbe3c13ea9e8d74775696d42">BlockSize</a>());</div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span> }</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span> </div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="keywordtype">void</span> CBC_MAC_Base::ProcessBuf()</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span> {</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  AccessCipher().<a class="code" href="class_block_transformation.html#a93b18a5b11cd6f61bf19624192575d1d">ProcessBlock</a>(m_reg);</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  m_counter = 0;</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span> }</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> </div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span> NAMESPACE_END</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span> </div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="preprocessor">#endif</span></div><div class="ttc" id="class_hash_transformation_html_a09c66b86bbe3c13ea9e8d74775696d42"><div class="ttname"><a href="class_hash_transformation.html#a09c66b86bbe3c13ea9e8d74775696d42">HashTransformation::BlockSize</a></div><div class="ttdeci">virtual unsigned int BlockSize() const</div><div class="ttdoc">Provides the block size of the compression function.</div><div class="ttdef"><b>Definition:</b> <a href="cryptlib_8h_source.html#l01116">cryptlib.h:1116</a></div></div>
<div class="ttc" id="class_simple_keying_interface_html_adf3c29b3ef3af74788a58c7c49887fd7"><div class="ttname"><a href="class_simple_keying_interface.html#adf3c29b3ef3af74788a58c7c49887fd7">SimpleKeyingInterface::SetKey</a></div><div class="ttdeci">virtual void SetKey(const byte *key, size_t length, const NameValuePairs &params=g_nullNameValuePairs)</div><div class="ttdoc">Sets or reset the key of this object.</div><div class="ttdef"><b>Definition:</b> <a href="cryptlib_8cpp_source.html#l00064">cryptlib.cpp:64</a></div></div>
<div class="ttc" id="class_block_transformation_html_adec6c003f0e1539c0a9da64e2d17352dab4c0ce98fee079d801069d4252f6c345"><div class="ttname"><a href="class_block_transformation.html#adec6c003f0e1539c0a9da64e2d17352dab4c0ce98fee079d801069d4252f6c345">BlockTransformation::BT_DontIncrementInOutPointers</a></div><div class="ttdoc">should not modify block pointers</div><div class="ttdef"><b>Definition:</b> <a href="cryptlib_8h_source.html#l00872">cryptlib.h:872</a></div></div>
<div class="ttc" id="cbcmac_8h_html"><div class="ttname"><a href="cbcmac_8h.html">cbcmac.h</a></div><div class="ttdoc">Classes for CBC MAC.</div></div>
<div class="ttc" id="class_c_b_c___m_a_c___base_html"><div class="ttname"><a href="class_c_b_c___m_a_c___base.html">CBC_MAC_Base</a></div><div class="ttdoc">CBC-MAC base class.</div><div class="ttdef"><b>Definition:</b> <a href="cbcmac_8h_source.html#l00017">cbcmac.h:17</a></div></div>
<div class="ttc" id="class_c_b_c___m_a_c___base_html_a50c5a8fc6a2926485295bbe72bcfe4d8"><div class="ttname"><a href="class_c_b_c___m_a_c___base.html#a50c5a8fc6a2926485295bbe72bcfe4d8">CBC_MAC_Base::TruncatedFinal</a></div><div class="ttdeci">void TruncatedFinal(byte *mac, size_t size)</div><div class="ttdoc">Computes the hash of the current message.</div><div class="ttdef"><b>Definition:</b> <a href="cbcmac_8cpp_source.html#l00043">cbcmac.cpp:43</a></div></div>
<div class="ttc" id="class_block_transformation_html_adfdb78b033996020435c3dcffdca76ce"><div class="ttname"><a href="class_block_transformation.html#adfdb78b033996020435c3dcffdca76ce">BlockTransformation::BlockSize</a></div><div class="ttdeci">virtual unsigned int BlockSize() const =0</div><div class="ttdoc">Provides the block size of the cipher.</div></div>
<div class="ttc" id="class_block_transformation_html_a73ad0afb596da5f7e1f26ddf47394afb"><div class="ttname"><a href="class_block_transformation.html#a73ad0afb596da5f7e1f26ddf47394afb">BlockTransformation::AdvancedProcessBlocks</a></div><div class="ttdeci">virtual size_t AdvancedProcessBlocks(const byte *inBlocks, const byte *xorBlocks, byte *outBlocks, size_t length, word32 flags) const</div><div class="ttdoc">Encrypt and xor multiple blocks using additional flags.</div><div class="ttdef"><b>Definition:</b> <a href="cryptlib_8cpp_source.html#l00147">cryptlib.cpp:147</a></div></div>
<div class="ttc" id="pch_8h_html"><div class="ttname"><a href="pch_8h.html">pch.h</a></div><div class="ttdoc">Precompiled header file.</div></div>
<div class="ttc" id="class_block_transformation_html_a93b18a5b11cd6f61bf19624192575d1d"><div class="ttname"><a href="class_block_transformation.html#a93b18a5b11cd6f61bf19624192575d1d">BlockTransformation::ProcessBlock</a></div><div class="ttdeci">void ProcessBlock(const byte *inBlock, byte *outBlock) const</div><div class="ttdoc">Encrypt or decrypt a block.</div><div class="ttdef"><b>Definition:</b> <a href="cryptlib_8h_source.html#l00832">cryptlib.h:832</a></div></div>
<div class="ttc" id="namespace_name_html_aa93e40d0259a59959d270e6c82a9f1eb"><div class="ttname"><a href="namespace_name.html#aa93e40d0259a59959d270e6c82a9f1eb">Name::BlockSize</a></div><div class="ttdeci">const char * BlockSize()</div><div class="ttdoc">int, in bytes</div><div class="ttdef"><b>Definition:</b> <a href="argnames_8h_source.html#l00027">argnames.h:27</a></div></div>
<div class="ttc" id="class_c_b_c___m_a_c___base_html_af4b9ad28defd9ff98d86f0d6de2f4cf0"><div class="ttname"><a href="class_c_b_c___m_a_c___base.html#af4b9ad28defd9ff98d86f0d6de2f4cf0">CBC_MAC_Base::Update</a></div><div class="ttdeci">void Update(const byte *input, size_t length)</div><div class="ttdoc">Updates a hash with additional input.</div><div class="ttdef"><b>Definition:</b> <a href="cbcmac_8cpp_source.html#l00016">cbcmac.cpp:16</a></div></div>
<div class="ttc" id="class_block_transformation_html_adec6c003f0e1539c0a9da64e2d17352da692d5da11e5444e32f6e4e091623eaab"><div class="ttname"><a href="class_block_transformation.html#adec6c003f0e1539c0a9da64e2d17352da692d5da11e5444e32f6e4e091623eaab">BlockTransformation::BT_XorInput</a></div><div class="ttdoc">Xor inputs before transformation.</div><div class="ttdef"><b>Definition:</b> <a href="cryptlib_8h_source.html#l00874">cryptlib.h:874</a></div></div>
<div class="ttc" id="namespace_crypto_p_p_html"><div class="ttname"><a href="namespace_crypto_p_p.html">CryptoPP</a></div><div class="ttdoc">Crypto++ library namespace.</div></div>
<div class="ttc" id="class_name_value_pairs_html"><div class="ttname"><a href="class_name_value_pairs.html">NameValuePairs</a></div><div class="ttdoc">Interface for retrieving values given their names.</div><div class="ttdef"><b>Definition:</b> <a href="cryptlib_8h_source.html#l00290">cryptlib.h:290</a></div></div>
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