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 <span id="projectnumber">7.0</span>
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<div class="title">square.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">// square.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> <span class="comment">// Based on Paulo S.L.M. Barreto's public domain implementation</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="preprocessor">#include "<a class="code" href="pch_8h.html">pch.h</a>"</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="preprocessor">#include "<a class="code" href="config_8h.html">config.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> <span class="preprocessor">#include "<a class="code" href="square_8h.html">square.h</a>"</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="preprocessor">#include "<a class="code" href="misc_8h.html">misc.h</a>"</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#include "<a class="code" href="gf256_8h.html">gf256.h</a>"</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> <span class="preprocessor">#if CRYPTOPP_MSC_VERSION</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor"># pragma warning(disable: 4244)</span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#endif</span></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> <span class="preprocessor">#if CRYPTOPP_GCC_DIAGNOSTIC_AVAILABLE</span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor"># pragma GCC diagnostic ignored "-Wmissing-braces"</span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> </div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> NAMESPACE_BEGIN(<a class="code" href="namespace_crypto_p_p.html">CryptoPP</a>)</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> <span class="comment">// apply theta to a roundkey</span></div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="keyword">static</span> <span class="keywordtype">void</span> SquareTransform (word32 in[4], word32 out[4])</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>  <span class="keyword">static</span> <span class="keyword">const</span> byte G[4][4] =</div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  {</div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  0x02U, 0x01U, 0x01U, 0x03U,</div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  0x03U, 0x02U, 0x01U, 0x01U,</div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  0x01U, 0x03U, 0x02U, 0x01U,</div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  0x01U, 0x01U, 0x03U, 0x02U</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> </div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  <a class="code" href="class_g_f256.html">GF256</a> gf256(0xf5);</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>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < 4; i++)</div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  {</div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  word32 temp = 0;</div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> j = 0; j < 4; j++)</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> k = 0; k < 4; k++)</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  temp ^= (word32)gf256.Multiply(GETBYTE(in[i], 3-k), G[k][j]) << ((3-j)*8);</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  out[i] = temp;</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"> 43</span> </div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="preprocessor">#define roundkeys(i, j) m_roundkeys[(i)*4+(j)]</span></div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="preprocessor">#define roundkeys4(i) (m_roundkeys+(i)*4)</span></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="keywordtype">void</span> Square::Base::UncheckedSetKey(<span class="keyword">const</span> byte *userKey, <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> &)</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>  AssertValidKeyLength(length);</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> </div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="keyword">static</span> <span class="keyword">const</span> word32 offset[ROUNDS] = {</div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  0x01000000UL, 0x02000000UL, 0x04000000UL, 0x08000000UL,</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  0x10000000UL, 0x20000000UL, 0x40000000UL, 0x80000000UL,</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  };</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>  GetUserKey(<a class="code" href="cryptlib_8h.html#aaeb92d42f5a6e27b8ba19f18d69d142baf0c3bb6c718cc7ff0bffef4e8f178c57">BIG_ENDIAN_ORDER</a>, m_roundkeys.data(), KEYLENGTH/4, userKey, KEYLENGTH);</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="comment">/* apply the key evolution function */</span></div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 1; i < ROUNDS+1; i++)</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>  roundkeys(i, 0) = roundkeys(i-1, 0) ^ rotlConstant<8>(roundkeys(i-1, 3)) ^ offset[i-1];</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  roundkeys(i, 1) = roundkeys(i-1, 1) ^ roundkeys(i, 0);</div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  roundkeys(i, 2) = roundkeys(i-1, 2) ^ roundkeys(i, 1);</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  roundkeys(i, 3) = roundkeys(i-1, 3) ^ roundkeys(i, 2);</div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  }</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span> </div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="comment">/* produce the round keys */</span></div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keywordflow">if</span> (IsForwardTransformation())</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>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < ROUNDS; i++)</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  SquareTransform (roundkeys4(i), roundkeys4(i));</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>  <span class="keywordflow">else</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>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < ROUNDS/2; i++)</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> j = 0; j < 4; j++)</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  std::swap(roundkeys(i, j), roundkeys(ROUNDS-i, j));</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  SquareTransform (roundkeys4(ROUNDS), roundkeys4(ROUNDS));</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  }</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> <span class="preprocessor">#define MSB(x) (((x) >> 24) & 0xffU) </span><span class="comment">/* most significant byte */</span><span class="preprocessor"></span></div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="preprocessor">#define SSB(x) (((x) >> 16) & 0xffU) </span><span class="comment">/* second in significance */</span><span class="preprocessor"></span></div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="preprocessor">#define TSB(x) (((x) >> 8) & 0xffU) </span><span class="comment">/* third in significance */</span><span class="preprocessor"></span></div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="preprocessor">#define LSB(x) (((x) ) & 0xffU) </span><span class="comment">/* least significant byte */</span><span class="preprocessor"></span></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> <span class="preprocessor">#define squareRound(text, temp, T0, T1, T2, T3, roundkey) \</span></div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span> <span class="preprocessor">{ \</span></div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span> <span class="preprocessor"> temp[0] = T0[MSB (text[0])] \</span></div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span> <span class="preprocessor"> ^ T1[MSB (text[1])] \</span></div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="preprocessor"> ^ T2[MSB (text[2])] \</span></div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span> <span class="preprocessor"> ^ T3[MSB (text[3])] \</span></div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span> <span class="preprocessor"> ^ roundkey[0]; \</span></div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span> <span class="preprocessor"> temp[1] = T0[SSB (text[0])] \</span></div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span> <span class="preprocessor"> ^ T1[SSB (text[1])] \</span></div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span> <span class="preprocessor"> ^ T2[SSB (text[2])] \</span></div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span> <span class="preprocessor"> ^ T3[SSB (text[3])] \</span></div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span> <span class="preprocessor"> ^ roundkey[1]; \</span></div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span> <span class="preprocessor"> temp[2] = T0[TSB (text[0])] \</span></div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span> <span class="preprocessor"> ^ T1[TSB (text[1])] \</span></div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span> <span class="preprocessor"> ^ T2[TSB (text[2])] \</span></div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span> <span class="preprocessor"> ^ T3[TSB (text[3])] \</span></div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span> <span class="preprocessor"> ^ roundkey[2]; \</span></div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span> <span class="preprocessor"> temp[3] = T0[LSB (text[0])] \</span></div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span> <span class="preprocessor"> ^ T1[LSB (text[1])] \</span></div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span> <span class="preprocessor"> ^ T2[LSB (text[2])] \</span></div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span> <span class="preprocessor"> ^ T3[LSB (text[3])] \</span></div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span> <span class="preprocessor"> ^ roundkey[3]; \</span></div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span> <span class="preprocessor">} </span><span class="comment">/* squareRound */</span><span class="preprocessor"></span></div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span> </div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span> <span class="preprocessor">#define squareFinal(text, temp, S, roundkey) \</span></div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span> <span class="preprocessor">{ \</span></div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span> <span class="preprocessor"> text[0] = ((word32) (S[MSB (temp[0])]) << 24) \</span></div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span> <span class="preprocessor"> ^ ((word32) (S[MSB (temp[1])]) << 16) \</span></div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span> <span class="preprocessor"> ^ ((word32) (S[MSB (temp[2])]) << 8) \</span></div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span> <span class="preprocessor"> ^ (word32) (S[MSB (temp[3])]) \</span></div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span> <span class="preprocessor"> ^ roundkey[0]; \</span></div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span> <span class="preprocessor"> text[1] = ((word32) (S[SSB (temp[0])]) << 24) \</span></div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span> <span class="preprocessor"> ^ ((word32) (S[SSB (temp[1])]) << 16) \</span></div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span> <span class="preprocessor"> ^ ((word32) (S[SSB (temp[2])]) << 8) \</span></div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span> <span class="preprocessor"> ^ (word32) (S[SSB (temp[3])]) \</span></div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span> <span class="preprocessor"> ^ roundkey[1]; \</span></div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span> <span class="preprocessor"> text[2] = ((word32) (S[TSB (temp[0])]) << 24) \</span></div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span> <span class="preprocessor"> ^ ((word32) (S[TSB (temp[1])]) << 16) \</span></div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span> <span class="preprocessor"> ^ ((word32) (S[TSB (temp[2])]) << 8) \</span></div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span> <span class="preprocessor"> ^ (word32) (S[TSB (temp[3])]) \</span></div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span> <span class="preprocessor"> ^ roundkey[2]; \</span></div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span> <span class="preprocessor"> text[3] = ((word32) (S[LSB (temp[0])]) << 24) \</span></div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span> <span class="preprocessor"> ^ ((word32) (S[LSB (temp[1])]) << 16) \</span></div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span> <span class="preprocessor"> ^ ((word32) (S[LSB (temp[2])]) << 8) \</span></div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span> <span class="preprocessor"> ^ (word32) (S[LSB (temp[3])]) \</span></div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span> <span class="preprocessor"> ^ roundkey[3]; \</span></div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span> <span class="preprocessor">} </span><span class="comment">/* squareFinal */</span><span class="preprocessor"></span></div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span> </div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span> <span class="keyword">typedef</span> <a class="code" href="struct_block_get_and_put.html">BlockGetAndPut<word32, BigEndian></a> <a class="code" href="struct_block_get_and_put.html">Block</a>;</div><div class="line"><a name="l00136"></a><span class="lineno"> 136</span> </div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span> <span class="keywordtype">void</span> Square::Enc::ProcessAndXorBlock(<span class="keyword">const</span> byte *inBlock, <span class="keyword">const</span> byte *xorBlock, byte *outBlock)<span class="keyword"> const</span></div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span> <span class="keyword"></span>{</div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  word32 text[4], temp[4];</div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  Block::Get(inBlock)(text[0])(text[1])(text[2])(text[3]);</div><div class="line"><a name="l00141"></a><span class="lineno"> 141</span> </div><div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  <span class="comment">/* initial key addition */</span></div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  text[0] ^= roundkeys(0, 0);</div><div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  text[1] ^= roundkeys(0, 1);</div><div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  text[2] ^= roundkeys(0, 2);</div><div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  text[3] ^= roundkeys(0, 3);</div><div class="line"><a name="l00147"></a><span class="lineno"> 147</span> </div><div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  <span class="comment">/* ROUNDS - 1 full rounds */</span></div><div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i=1; i+1<ROUNDS; i+=2)</div><div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  {</div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  squareRound (text, temp, Te[0], Te[1], Te[2], Te[3], roundkeys4(i));</div><div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  squareRound (temp, text, Te[0], Te[1], Te[2], Te[3], roundkeys4(i+1));</div><div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  }</div><div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  squareRound (text, temp, Te[0], Te[1], Te[2], Te[3], roundkeys4(ROUNDS-1));</div><div class="line"><a name="l00155"></a><span class="lineno"> 155</span> </div><div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  <span class="comment">/* last round (diffusion becomes only transposition) */</span></div><div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  squareFinal (text, temp, Se, roundkeys4(ROUNDS));</div><div class="line"><a name="l00158"></a><span class="lineno"> 158</span> </div><div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  <a class="code" href="class_put_block.html">Block::Put</a>(xorBlock, outBlock)(text[0])(text[1])(text[2])(text[3]);</div><div class="line"><a name="l00160"></a><span class="lineno"> 160</span> }</div><div class="line"><a name="l00161"></a><span class="lineno"> 161</span> </div><div class="line"><a name="l00162"></a><span class="lineno"> 162</span> <span class="keywordtype">void</span> Square::Dec::ProcessAndXorBlock(<span class="keyword">const</span> byte *inBlock, <span class="keyword">const</span> byte *xorBlock, byte *outBlock)<span class="keyword"> const</span></div><div class="line"><a name="l00163"></a><span class="lineno"> 163</span> <span class="keyword"></span>{</div><div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  word32 text[4], temp[4];</div><div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  Block::Get(inBlock)(text[0])(text[1])(text[2])(text[3]);</div><div class="line"><a name="l00166"></a><span class="lineno"> 166</span> </div><div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  <span class="comment">/* initial key addition */</span></div><div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  text[0] ^= roundkeys(0, 0);</div><div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  text[1] ^= roundkeys(0, 1);</div><div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  text[2] ^= roundkeys(0, 2);</div><div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  text[3] ^= roundkeys(0, 3);</div><div class="line"><a name="l00172"></a><span class="lineno"> 172</span> </div><div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  <span class="comment">/* ROUNDS - 1 full rounds */</span></div><div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i=1; i+1<ROUNDS; i+=2)</div><div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  {</div><div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  squareRound (text, temp, Td[0], Td[1], Td[2], Td[3], roundkeys4(i));</div><div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  squareRound (temp, text, Td[0], Td[1], Td[2], Td[3], roundkeys4(i+1));</div><div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  }</div><div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  squareRound (text, temp, Td[0], Td[1], Td[2], Td[3], roundkeys4(ROUNDS-1));</div><div class="line"><a name="l00180"></a><span class="lineno"> 180</span> </div><div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  <span class="comment">/* last round (diffusion becomes only transposition) */</span></div><div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  squareFinal (text, temp, Sd, roundkeys4(ROUNDS));</div><div class="line"><a name="l00183"></a><span class="lineno"> 183</span> </div><div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  <a class="code" href="class_put_block.html">Block::Put</a>(xorBlock, outBlock)(text[0])(text[1])(text[2])(text[3]);</div><div class="line"><a name="l00185"></a><span class="lineno"> 185</span> }</div><div class="line"><a name="l00186"></a><span class="lineno"> 186</span> </div><div class="line"><a name="l00187"></a><span class="lineno"> 187</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="config_8h_html"><div class="ttname"><a href="config_8h.html">config.h</a></div><div class="ttdoc">Library configuration file. </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="class_g_f256_html"><div class="ttname"><a href="class_g_f256.html">GF256</a></div><div class="ttdoc">GF(256) with polynomial basis. </div><div class="ttdef"><b>Definition:</b> <a href="gf256_8h_source.html#l00015">gf256.h:15</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="cryptlib_8h_html_aaeb92d42f5a6e27b8ba19f18d69d142baf0c3bb6c718cc7ff0bffef4e8f178c57"><div class="ttname"><a href="cryptlib_8h.html#aaeb92d42f5a6e27b8ba19f18d69d142baf0c3bb6c718cc7ff0bffef4e8f178c57">BIG_ENDIAN_ORDER</a></div><div class="ttdoc">byte order is big-endian </div><div class="ttdef"><b>Definition:</b> <a href="cryptlib_8h_source.html#l00144">cryptlib.h:144</a></div></div>
<div class="ttc" id="gf256_8h_html"><div class="ttname"><a href="gf256_8h.html">gf256.h</a></div><div class="ttdoc">Classes and functions for schemes over GF(256) </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="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="square_8h_html"><div class="ttname"><a href="square_8h.html">square.h</a></div><div class="ttdoc">Classes for the Square block cipher. </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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