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 <span id="projectnumber">7.0</span>
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<div class="title">serpent.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">// serpent.cpp - originally written and placed in the public domain by Wei Dai</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">#include "<a class="code" href="pch_8h.html">pch.h</a>"</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="serpent_8h.html">serpent.h</a>"</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="preprocessor">#include "<a class="code" href="secblock_8h.html">secblock.h</a>"</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="preprocessor">#include "<a class="code" href="misc_8h.html">misc.h</a>"</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> </div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#include "serpentp.h"</span></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> NAMESPACE_BEGIN(<a class="code" href="namespace_crypto_p_p.html">CryptoPP</a>)</div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> </div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="keywordtype">void</span> Serpent_KeySchedule(word32 *k, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> rounds, <span class="keyword">const</span> <span class="keywordtype">byte</span> *userKey, <span class="keywordtype">size_t</span> keylen)</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>  <a class="code" href="class_fixed_size_sec_block.html">FixedSizeSecBlock<word32, 8></a> k0;</div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span>  GetUserKey(<a class="code" href="cryptlib_8h.html#aaeb92d42f5a6e27b8ba19f18d69d142baccd5b3585bd07d6bdae383aa8271b9d2">LITTLE_ENDIAN_ORDER</a>, k0.begin(), 8, userKey, keylen);</div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span>  <span class="keywordflow">if</span> (keylen < 32)</div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span>  k0[keylen/4] |= word32(1) << ((keylen%4)*8);</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>  word32 t = k0[7];</div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i;</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  <span class="keywordflow">for</span> (i = 0; i < 8; ++i)</div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  k[i] = k0[i] = t = rotlConstant<11>(k0[i] ^ k0[(i + 3) % 8] ^ k0[(i + 5) % 8] ^ t ^ 0x9e3779b9 ^ i);</div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  <span class="keywordflow">for</span> (i = 8; i < 4*(rounds+1); ++i)</div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  k[i] = t = rotlConstant<11>(k[i-8] ^ k[i-5] ^ k[i-3] ^ t ^ 0x9e3779b9 ^ i);</div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  k -= 20;</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>  word32 a,b,c,d,e;</div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  <span class="keywordflow">for</span> (i=0; i<rounds/8; i++)</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  {</div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  afterS2(LK); afterS2(S3); afterS3(SK);</div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  afterS1(LK); afterS1(S2); afterS2(SK);</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  afterS0(LK); afterS0(S1); afterS1(SK);</div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  beforeS0(LK); beforeS0(S0); afterS0(SK);</div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  k += 8*4;</div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  afterS6(LK); afterS6(S7); afterS7(SK);</div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  afterS5(LK); afterS5(S6); afterS6(SK);</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  afterS4(LK); afterS4(S5); afterS5(SK);</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  afterS3(LK); afterS3(S4); afterS4(SK);</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>  afterS2(LK); afterS2(S3); afterS3(SK);</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> }</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> </div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="keywordtype">void</span> Serpent::Base::UncheckedSetKey(<span class="keyword">const</span> <span class="keywordtype">byte</span> *userKey, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> keylen, <span class="keyword">const</span> <a class="code" href="class_name_value_pairs.html">NameValuePairs</a> &)</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span> {</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  AssertValidKeyLength(keylen);</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  Serpent_KeySchedule(m_key, 32, userKey, keylen);</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> }</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> <span class="keyword">typedef</span> <a class="code" href="struct_block_get_and_put.html">BlockGetAndPut<word32, LittleEndian></a> <a class="code" href="struct_block_get_and_put.html">Block</a>;</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> </div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="keywordtype">void</span> Serpent::Enc::ProcessAndXorBlock(<span class="keyword">const</span> <span class="keywordtype">byte</span> *inBlock, <span class="keyword">const</span> <span class="keywordtype">byte</span> *xorBlock, <span class="keywordtype">byte</span> *outBlock)<span class="keyword"> const</span></div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="keyword"></span>{</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  word32 a, b, c, d, e;</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>  Block::Get(inBlock)(a)(b)(c)(d);</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span> </div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keyword">const</span> word32 *k = m_key;</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=1;</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">do</span></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>  beforeS0(KX); beforeS0(S0); afterS0(LT);</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  afterS0(KX); afterS0(S1); afterS1(LT);</div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  afterS1(KX); afterS1(S2); afterS2(LT);</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  afterS2(KX); afterS2(S3); afterS3(LT);</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  afterS3(KX); afterS3(S4); afterS4(LT);</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  afterS4(KX); afterS4(S5); afterS5(LT);</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  afterS5(KX); afterS5(S6); afterS6(LT);</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  afterS6(KX); afterS6(S7);</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span> </div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="keywordflow">if</span> (i == 4)</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keywordflow">break</span>;</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span> </div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  ++i;</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  c = b;</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  b = e;</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  e = d;</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  d = a;</div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  a = e;</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  k += 32;</div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  beforeS0(LT);</div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  }</div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="keywordflow">while</span> (<span class="keyword">true</span>);</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span> </div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  afterS7(KX);</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span> </div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <a class="code" href="class_put_block.html">Block::Put</a>(xorBlock, outBlock)(d)(e)(b)(a);</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span> }</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span> </div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="keywordtype">void</span> Serpent::Dec::ProcessAndXorBlock(<span class="keyword">const</span> <span class="keywordtype">byte</span> *inBlock, <span class="keyword">const</span> <span class="keywordtype">byte</span> *xorBlock, <span class="keywordtype">byte</span> *outBlock)<span class="keyword"> const</span></div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span> <span class="keyword"></span>{</div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  word32 a, b, c, d, e=0;</div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span> </div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  Block::Get(inBlock)(a)(b)(c)(d);</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span> </div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <span class="keyword">const</span> word32 *k = m_key + 96;</div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=4;</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>  beforeI7(KX);</div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="keywordflow">goto</span> start;</div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span> </div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="keywordflow">do</span></div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  {</div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  c = b;</div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  b = d;</div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  d = e;</div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  k -= 32;</div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  beforeI7(ILT);</div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span> start:</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  beforeI7(I7); afterI7(KX);</div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  afterI7(ILT); afterI7(I6); afterI6(KX);</div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  afterI6(ILT); afterI6(I5); afterI5(KX);</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  afterI5(ILT); afterI5(I4); afterI4(KX);</div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  afterI4(ILT); afterI4(I3); afterI3(KX);</div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  afterI3(ILT); afterI3(I2); afterI2(KX);</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  afterI2(ILT); afterI2(I1); afterI1(KX);</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  afterI1(ILT); afterI1(I0); afterI0(KX);</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>  <span class="keywordflow">while</span> (--i != 0);</div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span> </div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <a class="code" href="class_put_block.html">Block::Put</a>(xorBlock, outBlock)(a)(d)(b)(e);</div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span> }</div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span> </div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span> NAMESPACE_END</div><div class="ttc" id="misc_8h_html"><div class="ttname"><a href="misc_8h.html">misc.h</a></div><div class="ttdoc">Utility functions for the Crypto++ library.</div></div>
<div class="ttc" id="struct_block_get_and_put_html"><div class="ttname"><a href="struct_block_get_and_put.html">BlockGetAndPut</a></div><div class="ttdoc">Access a block of memory.</div><div class="ttdef"><b>Definition:</b> <a href="misc_8h_source.html#l02402">misc.h:2402</a></div></div>
<div class="ttc" id="cryptlib_8h_html_aaeb92d42f5a6e27b8ba19f18d69d142baccd5b3585bd07d6bdae383aa8271b9d2"><div class="ttname"><a href="cryptlib_8h.html#aaeb92d42f5a6e27b8ba19f18d69d142baccd5b3585bd07d6bdae383aa8271b9d2">LITTLE_ENDIAN_ORDER</a></div><div class="ttdoc">byte order is little-endian</div><div class="ttdef"><b>Definition:</b> <a href="cryptlib_8h_source.html#l00142">cryptlib.h:142</a></div></div>
<div class="ttc" id="secblock_8h_html"><div class="ttname"><a href="secblock_8h.html">secblock.h</a></div><div class="ttdoc">Classes and functions for secure memory allocations.</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_fixed_size_sec_block_html"><div class="ttname"><a href="class_fixed_size_sec_block.html">FixedSizeSecBlock< word32, 8 ></a></div></div>
<div class="ttc" id="class_put_block_html"><div class="ttname"><a href="class_put_block.html">PutBlock</a></div><div class="ttdoc">Access a block of memory.</div><div class="ttdef"><b>Definition:</b> <a href="misc_8h_source.html#l02365">misc.h:2365</a></div></div>
<div class="ttc" id="serpent_8h_html"><div class="ttname"><a href="serpent_8h.html">serpent.h</a></div><div class="ttdoc">Classes for the Serpent block cipher.</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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