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<div id="projectname">Crypto++
 <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">md2.cpp</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// md2.cpp - modified by Wei Dai from Andrew M. Kuchling's md2.c</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">// The original code and all modifications are in the public domain.</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> </div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">// This is the original introductory comment:</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> </div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">/*</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * md2.c : MD2 hash algorithm.</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> *</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * Part of the Python Cryptography Toolkit, version 1.1</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> *</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * Distribute and use freely; there are no restrictions on further</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * dissemination and usage except those imposed by the laws of your</span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> * country of residence.</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> *</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> */</span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> </div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor">#include "<a class="code" href="pch_8h.html">pch.h</a>"</span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="preprocessor">#define CRYPTOPP_ENABLE_NAMESPACE_WEAK 1</span></div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="preprocessor">#include "<a class="code" href="md2_8h.html">md2.h</a>"</span></div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> </div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> NAMESPACE_BEGIN(<a class="code" href="namespace_crypto_p_p.html">CryptoPP</a>)</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="keyword">namespace </span>Weak1 {</div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> </div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> MD2::MD2()</div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  : m_X(48), m_C(16), m_buf(16)</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>  Init();</div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> }</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">void</span> MD2::Init()</div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> {</div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  memset(m_X, 0, 48);</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  memset(m_C, 0, 16);</div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  memset(m_buf, 0, 16);</div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  m_count = 0;</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> </div><div class="line"><a name="l00038"></a><span class="lineno"><a class="line" href="class_weak_1_1_m_d2.html#aed0c8db8407fb1c6c0014d68bedc10fd"> 38</a></span> <span class="keywordtype">void</span> MD2::Update(<span class="keyword">const</span> byte *buf, <span class="keywordtype">size_t</span> len)</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> {</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="keyword">static</span> <span class="keyword">const</span> byte S[256] = {</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  41, 46, 67, 201, 162, 216, 124, 1, 61, 54, 84, 161, 236, 240, 6,</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  19, 98, 167, 5, 243, 192, 199, 115, 140, 152, 147, 43, 217, 188,</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  76, 130, 202, 30, 155, 87, 60, 253, 212, 224, 22, 103, 66, 111, 24,</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  138, 23, 229, 18, 190, 78, 196, 214, 218, 158, 222, 73, 160, 251,</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  245, 142, 187, 47, 238, 122, 169, 104, 121, 145, 21, 178, 7, 63,</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  148, 194, 16, 137, 11, 34, 95, 33, 128, 127, 93, 154, 90, 144, 50,</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  39, 53, 62, 204, 231, 191, 247, 151, 3, 255, 25, 48, 179, 72, 165,</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  181, 209, 215, 94, 146, 42, 172, 86, 170, 198, 79, 184, 56, 210,</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  150, 164, 125, 182, 118, 252, 107, 226, 156, 116, 4, 241, 69, 157,</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  112, 89, 100, 113, 135, 32, 134, 91, 207, 101, 230, 45, 168, 2, 27,</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  96, 37, 173, 174, 176, 185, 246, 28, 70, 97, 105, 52, 64, 126, 15,</div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  85, 71, 163, 35, 221, 81, 175, 58, 195, 92, 249, 206, 186, 197,</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  234, 38, 44, 83, 13, 110, 133, 40, 132, 9, 211, 223, 205, 244, 65,</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  129, 77, 82, 106, 220, 55, 200, 108, 193, 171, 250, 36, 225, 123,</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  8, 12, 189, 177, 74, 120, 136, 149, 139, 227, 99, 232, 109, 233,</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  203, 213, 254, 59, 0, 29, 57, 242, 239, 183, 14, 102, 88, 208, 228,</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  166, 119, 114, 248, 235, 117, 75, 10, 49, 68, 80, 180, 143, 237,</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  31, 26, 219, 153, 141, 51, 159, 17, 131, 20</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> </div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keywordflow">while</span> (len)</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  {</div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> L = <a class="code" href="misc_8h.html#ac8391e7d9d613a6c401787d2cdab1f51">UnsignedMin</a>(16U-m_count, len);</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  memcpy(m_buf+m_count, buf, L);</div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  m_count+=L;</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  buf+=L;</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  len-=L;</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keywordflow">if</span> (m_count==16)</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  {</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  byte t;</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="keywordtype">int</span> i,j;</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span> </div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  m_count=0;</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  memcpy(m_X+16, m_buf, 16);</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  t=m_C[15];</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="keywordflow">for</span>(i=0; i<16; i++)</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  {</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  m_X[32+i]=m_X[16+i]^m_X[i];</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  t=m_C[i]^=S[m_buf[i]^t];</div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  }</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span> </div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  t=0;</div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="keywordflow">for</span>(i=0; i<18; i++)</div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  {</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="keywordflow">for</span>(j=0; j<48; j+=8)</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  {</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  t=m_X[j+0]^=S[t];</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  t=m_X[j+1]^=S[t];</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  t=m_X[j+2]^=S[t];</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  t=m_X[j+3]^=S[t];</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  t=m_X[j+4]^=S[t];</div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  t=m_X[j+5]^=S[t];</div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  t=m_X[j+6]^=S[t];</div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  t=m_X[j+7]^=S[t];</div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  }</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  t = byte((t+i) & 0xFF);</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  }</div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  }</div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  }</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span> }</div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span> </div><div class="line"><a name="l00102"></a><span class="lineno"><a class="line" href="class_weak_1_1_m_d2.html#a52532c3a06bd29559db192738fca5944"> 102</a></span> <span class="keywordtype">void</span> MD2::TruncatedFinal(byte *hash, <span class="keywordtype">size_t</span> size)</div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span> {</div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  ThrowIfInvalidTruncatedSize(size);</div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span> </div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  byte padding[16];</div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  word32 padlen;</div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i;</div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span> </div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  padlen= 16-m_count;</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="keywordflow">for</span>(i=0; i<padlen; i++) padding[i]=(byte)padlen;</div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  Update(padding, padlen);</div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  Update(m_C, 16);</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  memcpy(hash, m_X, size);</div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span> </div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  Init();</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span> }</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span> </div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span> }</div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span> NAMESPACE_END</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="misc_8h_html_ac8391e7d9d613a6c401787d2cdab1f51"><div class="ttname"><a href="misc_8h.html#ac8391e7d9d613a6c401787d2cdab1f51">UnsignedMin</a></div><div class="ttdeci">const T1 UnsignedMin(const T1 &a, const T2 &b)</div><div class="ttdoc">Safe comparison of values that could be neagtive and incorrectly promoted. </div><div class="ttdef"><b>Definition:</b> <a href="misc_8h_source.html#l00546">misc.h:546</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="md2_8h_html"><div class="ttname"><a href="md2_8h.html">md2.h</a></div><div class="ttdoc">Classes for the MD2 message digest. </div></div>
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