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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">wake.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">// wake.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="wake_8h.html">wake.h</a>"</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="preprocessor">#include "<a class="code" href="smartptr_8h.html">smartptr.h</a>"</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> </div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> NAMESPACE_BEGIN(<a class="code" href="namespace_crypto_p_p.html">CryptoPP</a>)</div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> </div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor">#if defined(CRYPTOPP_DEBUG) && !defined(CRYPTOPP_DOXYGEN_PROCESSING)</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="keywordtype">void</span> WAKE_TestInstantiations()</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>  <a class="code" href="class_symmetric_cipher_final.html">WAKE_OFB<>::Encryption</a> x2;</div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span>  <a class="code" href="class_symmetric_cipher.html">WAKE_OFB<>::Decryption</a> x4;</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> <span class="preprocessor">#endif</span></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="keyword">inline</span> word32 WAKE_Base::M(word32 x, word32 y)</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 w = x+y;</div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  <span class="keywordflow">return</span> (w>>8) ^ t[w & 0xff];</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> }</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="keywordtype">void</span> WAKE_Base::GenKey(word32 k0, word32 k1, word32 k2, word32 k3)</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>  <span class="comment">// this code is mostly copied from David Wheeler's paper "A Bulk Data Encryption Algorithm"</span></div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  <span class="keywordtype">signed</span> <span class="keywordtype">int</span> x, z, p;</div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  <span class="comment">// x and z were declared as "long" in Wheeler's paper, which is a signed type. I don't know if that was intentional, but it's too late to change it now. -- Wei 7/4/2010</span></div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  <a class="code" href="misc_8h.html#a6b378b1b9b2d4654cc852c088742ba70">CRYPTOPP_COMPILE_ASSERT</a>(<span class="keyword">sizeof</span>(x) == 4);</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  <span class="keyword">static</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> tt[10]= {</div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  0x726a8f3b, <span class="comment">// table</span></div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  0xe69a3b5c,</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  0xd3c71fe5,</div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  0xab3c73d2,</div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  0x4d3a8eb3,</div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  0x0396d6e8,</div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  0x3d4c2f7a,</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  0x9ee27cf3, } ;</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  t[0] = k0;</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  t[1] = k1;</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  t[2] = k2;</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  t[3] = k3;</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="keywordflow">for</span> (p=4 ; p<256 ; p++)</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>  x=t[p-4]+t[p-1] ; <span class="comment">// fill t</span></div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  t[p]= (x>>3) ^ tt[x&7] ;</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  }</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="keywordflow">for</span> (p=0 ; p<23 ; p++)</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  t[p]+=t[p+89] ; <span class="comment">// mix first entries</span></div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  x=t[33] ; z=t[59] | 0x01000001 ;</div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  z=z&0xff7fffff ;</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keywordflow">for</span> (p=0 ; p<256 ; p++) { <span class="comment">//change top byte to</span></div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  x=(x&0xff7fffff)+z ; <span class="comment">// a permutation etc</span></div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  t[p]=(t[p] & 0x00ffffff) ^ x ; }</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span> </div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  t[256]=t[0] ;</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keywordtype">byte</span> y=byte(x);</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="keywordflow">for</span> (p=0 ; p<256 ; p++) { <span class="comment">// further change perm.</span></div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  t[p]=t[y=byte(t[p^y]^y)] ; <span class="comment">// and other digits</span></div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  t[y]=t[p+1] ; }</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> </div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="keyword">template</span> <<span class="keyword">class</span> B></div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="keywordtype">void</span> <a class="code" href="class_w_a_k_e___policy.html">WAKE_Policy<B>::CipherSetKey</a>(<span class="keyword">const</span> <a class="code" href="class_name_value_pairs.html">NameValuePairs</a> &params, <span class="keyword">const</span> <span class="keywordtype">byte</span> *key, <span class="keywordtype">size_t</span> length)</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>  CRYPTOPP_UNUSED(params); CRYPTOPP_UNUSED(key); CRYPTOPP_UNUSED(length);</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  word32 k0, k1, k2, k3;</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <a class="code" href="struct_block_get_and_put.html">BlockGetAndPut<word32, BigEndian>::Get</a>(key)(r3)(r4)(r5)(r6)(k0)(k1)(k2)(k3);</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  GenKey(k0, k1, k2, k3);</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> </div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="comment">// OFB</span></div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="keyword">template</span> <<span class="keyword">class</span> B></div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="keywordtype">void</span> <a class="code" href="class_w_a_k_e___policy.html">WAKE_Policy<B>::OperateKeystream</a>(<a class="code" href="strciphr_8h.html#ab4a226527d2bd01ff19bfa14d0974227">KeystreamOperation</a> operation, <span class="keywordtype">byte</span> *output, <span class="keyword">const</span> <span class="keywordtype">byte</span> *input, <span class="keywordtype">size_t</span> iterationCount)</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span> {</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="preprocessor">#define WAKE_OUTPUT(x)\</span></div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="preprocessor"> while (iterationCount--)\</span></div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="preprocessor"> {\</span></div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="preprocessor"> CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, B::ToEnum(), 0, r6);\</span></div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="preprocessor"> r3 = M(r3, r6);\</span></div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="preprocessor"> r4 = M(r4, r3);\</span></div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="preprocessor"> r5 = M(r5, r4);\</span></div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="preprocessor"> r6 = M(r6, r5);\</span></div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="preprocessor"> output += 4;\</span></div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span> <span class="preprocessor"> if (!(x & INPUT_NULL))\</span></div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="preprocessor"> input += 4;\</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> </div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keyword">typedef</span> word32 WordType;</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  <a class="code" href="strciphr_8h.html#a4f82514b5ab874259ac783ff9b96c4e5">CRYPTOPP_KEYSTREAM_OUTPUT_SWITCH</a>(WAKE_OUTPUT, 0);</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> <span class="comment">/*</span></div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span> <span class="comment">template <class B></span></div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span> <span class="comment">void WAKE_ROFB_Policy<B>::Iterate(KeystreamOperation operation, byte *output, const byte *input, unsigned int iterationCount)</span></div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span> <span class="comment">{</span></div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span> <span class="comment"> KeystreamOutput<B> keystreamOperation(operation, output, input);</span></div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span> <span class="comment"></span></div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span> <span class="comment"> while (iterationCount--)</span></div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span> <span class="comment"> {</span></div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span> <span class="comment"> keystreamOperation(r6);</span></div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span> <span class="comment"> r3 = M(r3, r6);</span></div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span> <span class="comment"> r4 = M(r4, r3);</span></div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span> <span class="comment"> r5 = M(r5, r4);</span></div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span> <span class="comment"> r6 = M(r6, r5);</span></div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span> <span class="comment"> }</span></div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span> <span class="comment">}</span></div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span> <span class="comment">*/</span></div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span> <span class="keyword">template</span> <span class="keyword">class </span><a class="code" href="class_w_a_k_e___policy.html">WAKE_Policy<BigEndian></a>;</div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span> <span class="keyword">template</span> <span class="keyword">class </span><a class="code" href="class_w_a_k_e___policy.html">WAKE_Policy<LittleEndian></a>;</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span> <span class="comment">//template class WAKE_ROFB_Policy<BigEndian>;</span></div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span> <span class="comment">//template class WAKE_ROFB_Policy<LittleEndian>;</span></div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span> </div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span> NAMESPACE_END</div><div class="ttc" id="smartptr_8h_html"><div class="ttname"><a href="smartptr_8h.html">smartptr.h</a></div><div class="ttdoc">Classes for automatic resource management.</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="strciphr_8h_html_a4f82514b5ab874259ac783ff9b96c4e5"><div class="ttname"><a href="strciphr_8h.html#a4f82514b5ab874259ac783ff9b96c4e5">CRYPTOPP_KEYSTREAM_OUTPUT_SWITCH</a></div><div class="ttdeci">#define CRYPTOPP_KEYSTREAM_OUTPUT_SWITCH(x, y)</div><div class="ttdoc">Helper macro to implement OperateKeystream.</div><div class="ttdef"><b>Definition:</b> <a href="strciphr_8h_source.html#l00230">strciphr.h:230</a></div></div>
<div class="ttc" id="misc_8h_html_a6b378b1b9b2d4654cc852c088742ba70"><div class="ttname"><a href="misc_8h.html#a6b378b1b9b2d4654cc852c088742ba70">CRYPTOPP_COMPILE_ASSERT</a></div><div class="ttdeci">#define CRYPTOPP_COMPILE_ASSERT(expr)</div><div class="ttdoc">Compile time assertion.</div><div class="ttdef"><b>Definition:</b> <a href="misc_8h_source.html#l00144">misc.h:144</a></div></div>
<div class="ttc" id="class_symmetric_cipher_html"><div class="ttname"><a href="class_symmetric_cipher.html">SymmetricCipher</a></div><div class="ttdoc">Interface for one direction (encryption or decryption) of a stream cipher or cipher mode.</div><div class="ttdef"><b>Definition:</b> <a href="cryptlib_8h_source.html#l01237">cryptlib.h:1237</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_w_a_k_e___policy_html"><div class="ttname"><a href="class_w_a_k_e___policy.html">WAKE_Policy</a></div><div class="ttdoc">WAKE stream cipher operation.</div><div class="ttdef"><b>Definition:</b> <a href="wake_8h_source.html#l00038">wake.h:38</a></div></div>
<div class="ttc" id="wake_8h_html"><div class="ttname"><a href="wake_8h.html">wake.h</a></div><div class="ttdoc">Classes for WAKE stream cipher.</div></div>
<div class="ttc" id="strciphr_8h_html_ab4a226527d2bd01ff19bfa14d0974227"><div class="ttname"><a href="strciphr_8h.html#ab4a226527d2bd01ff19bfa14d0974227">KeystreamOperation</a></div><div class="ttdeci">KeystreamOperation</div><div class="ttdoc">Keystream operation flags.</div><div class="ttdef"><b>Definition:</b> <a href="strciphr_8h_source.html#l00088">strciphr.h:88</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_symmetric_cipher_final_html"><div class="ttname"><a href="class_symmetric_cipher_final.html">SymmetricCipherFinal</a></div><div class="ttdoc">SymmetricCipher implementation.</div><div class="ttdef"><b>Definition:</b> <a href="strciphr_8h_source.html#l00571">strciphr.h:571</a></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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