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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">blowfish.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">// blowfish.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> <span class="preprocessor">#include "<a class="code" href="blowfish_8h.html">blowfish.h</a>"</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="preprocessor">#include "<a class="code" href="misc_8h.html">misc.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"> 9</span> <span class="keywordtype">void</span> Blowfish::Base::UncheckedSetKey(<span class="keyword">const</span> byte *key_string, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> keylength, <span class="keyword">const</span> <a class="code" href="class_name_value_pairs.html">NameValuePairs</a> &)</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>  AssertValidKeyLength(keylength);</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">unsigned</span> i, j=0, k;</div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span>  word32 data, dspace[2] = {0, 0};</div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> </div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span>  memcpy(pbox, p_init, <span class="keyword">sizeof</span>(p_init));</div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span>  memcpy(sbox, s_init, <span class="keyword">sizeof</span>(s_init));</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>  <span class="comment">// Xor key string into encryption key vector</span></div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span>  <span class="keywordflow">for</span> (i=0 ; i<ROUNDS+2 ; ++i)</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>  data = 0 ;</div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  <span class="keywordflow">for</span> (k=0 ; k<4 ; ++k )</div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  data = (data << 8) | key_string[j++ % keylength];</div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  pbox[i] ^= data;</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>  crypt_block(dspace, pbox);</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="keywordflow">for</span> (i=0; i<ROUNDS; i+=2)</div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  crypt_block(pbox+i, pbox+i+2);</div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span> </div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  crypt_block(pbox+ROUNDS, sbox);</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">for</span> (i=0; i<4*256-2; i+=2)</div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  crypt_block(sbox+i, sbox+i+2);</div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> </div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="keywordflow">if</span> (!IsForwardTransformation())</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="keywordflow">for</span> (i=0; i<(ROUNDS+2)/2; i++)</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  std::swap(pbox[i], pbox[ROUNDS+1-i]);</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> <span class="comment">// this version is only used to make pbox and sbox</span></div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="keywordtype">void</span> Blowfish::Base::crypt_block(<span class="keyword">const</span> word32 in[2], word32 out[2])<span class="keyword"> const</span></div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="keyword"></span>{</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  word32 left = in[0];</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  word32 right = in[1];</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>  <span class="keyword">const</span> word32 *<span class="keyword">const</span> s=sbox;</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="keyword">const</span> word32 *p=pbox;</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>  left ^= p[0];</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="keywordflow">for</span> (<span class="keywordtype">unsigned</span> i=0; i<ROUNDS/2; i++)</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>  right ^= (((s[GETBYTE(left,3)] + s[256+GETBYTE(left,2)])</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  ^ s[2*256+GETBYTE(left,1)]) + s[3*256+GETBYTE(left,0)])</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  ^ p[2*i+1];</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>  left ^= (((s[GETBYTE(right,3)] + s[256+GETBYTE(right,2)])</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  ^ s[2*256+GETBYTE(right,1)]) + s[3*256+GETBYTE(right,0)])</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  ^ p[2*i+2];</div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  }</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span> </div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  right ^= p[ROUNDS+1];</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>  out[0] = right;</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  out[1] = left;</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> </div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="keywordtype">void</span> Blowfish::Base::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="l00072"></a><span class="lineno"> 72</span> <span class="keyword"></span>{</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</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="l00074"></a><span class="lineno"> 74</span> </div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  word32 left, right;</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  Block::Get(inBlock)(left)(right);</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>  <span class="keyword">const</span> word32 *<span class="keyword">const</span> s=sbox;</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="keyword">const</span> word32 *p=pbox;</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>  left ^= p[0];</div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span> </div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> i=0; i<ROUNDS/2; 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>  right ^= (((s[GETBYTE(left,3)] + s[256+GETBYTE(left,2)])</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  ^ s[2*256+GETBYTE(left,1)]) + s[3*256+GETBYTE(left,0)])</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  ^ p[2*i+1];</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span> </div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  left ^= (((s[GETBYTE(right,3)] + s[256+GETBYTE(right,2)])</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  ^ s[2*256+GETBYTE(right,1)]) + s[3*256+GETBYTE(right,0)])</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  ^ p[2*i+2];</div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  }</div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span> </div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  right ^= p[ROUNDS+1];</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>  <a class="code" href="class_put_block.html">Block::Put</a>(xorBlock, outBlock)(right)(left);</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> 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="blowfish_8h_html"><div class="ttname"><a href="blowfish_8h.html">blowfish.h</a></div><div class="ttdoc">Classes for the Blowfish block cipher. </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_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="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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