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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">rc6.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">// rc6.cpp - written and placed in the public domain by Sean Woods</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">// based on Wei Dai's RC5 code.</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="rc6_8h.html">rc6.h</a>"</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="preprocessor">#include "<a class="code" href="misc_8h.html">misc.h</a>"</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="preprocessor">#include "<a class="code" href="secblock_8h.html">secblock.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> NAMESPACE_BEGIN(<a class="code" href="namespace_crypto_p_p.html">CryptoPP</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> <span class="keywordtype">void</span> RC6::Base::UncheckedSetKey(<span class="keyword">const</span> byte *k, <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> &params)</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>  AssertValidKeyLength(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>  r = GetRoundsAndThrowIfInvalid(params, <span class="keyword">this</span>);</div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span>  sTable.New(2*(r+2));</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">static</span> <span class="keyword">const</span> RC6_WORD MAGIC_P = 0xb7e15163L; <span class="comment">// magic constant P for wordsize</span></div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  <span class="keyword">static</span> <span class="keyword">const</span> RC6_WORD MAGIC_Q = 0x9e3779b9L; <span class="comment">// magic constant Q for wordsize</span></div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span>  <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">int</span> U=<span class="keyword">sizeof</span>(RC6_WORD);</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>  <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> c = <a class="code" href="misc_8h.html#af1490597cb11989e78d5ba5b5f21266b">STDMAX</a>((keylen+U-1)/U, 1U); <span class="comment">// RC6 paper says c=1 if keylen==0</span></div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  <a class="code" href="class_sec_block.html">SecBlock<RC6_WORD></a> l(c);</div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> </div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  GetUserKey(<a class="code" href="cryptlib_8h.html#aaeb92d42f5a6e27b8ba19f18d69d142baccd5b3585bd07d6bdae383aa8271b9d2">LITTLE_ENDIAN_ORDER</a>, l.begin(), c, k, keylen);</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>  sTable[0] = MAGIC_P;</div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> j=1; j<sTable.size();j++)</div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  sTable[j] = sTable[j-1] + MAGIC_Q;</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>  RC6_WORD a=0, b=0;</div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  <span class="keyword">const</span> <span class="keywordtype">unsigned</span> n = 3*<a class="code" href="misc_8h.html#af1490597cb11989e78d5ba5b5f21266b">STDMAX</a>((<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>)sTable.size(), c);</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">unsigned</span> h=0; h < n; h++)</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>  a = sTable[h % sTable.size()] = rotlConstant<3>((sTable[h % sTable.size()] + a + b));</div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  b = l[h % c] = <a class="code" href="misc_8h.html#ad31fe5d559d014085c6a49594b817196">rotlMod</a>((l[h % c] + a + b), (a+b));</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  }</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> </div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="keyword">typedef</span> <a class="code" href="struct_block_get_and_put.html">BlockGetAndPut<RC6::RC6_WORD, LittleEndian></a> <a class="code" href="struct_block_get_and_put.html">Block</a>;</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="keywordtype">void</span> RC6::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="l00044"></a><span class="lineno"> 44</span> <span class="keyword"></span>{</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="keyword">const</span> RC6_WORD *sptr = sTable;</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  RC6_WORD a, b, c, d, t, u;</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>  Block::Get(inBlock)(a)(b)(c)(d);</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  b += sptr[0];</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  d += sptr[1];</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  sptr += 2;</div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span> </div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keywordflow">for</span>(<span class="keywordtype">unsigned</span> i=0; i<r; i++)</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>  t = rotlConstant<5>(b*(2*b+1));</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  u = rotlConstant<5>(d*(2*d+1));</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  a = <a class="code" href="misc_8h.html#ad31fe5d559d014085c6a49594b817196">rotlMod</a>(a^t,u) + sptr[0];</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  c = <a class="code" href="misc_8h.html#ad31fe5d559d014085c6a49594b817196">rotlMod</a>(c^u,t) + sptr[1];</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  t = a; a = b; b = c; c = d; d = t;</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  sptr += 2;</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</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>  a += sptr[0];</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  c += sptr[1];</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>  <a class="code" href="class_put_block.html">Block::Put</a>(xorBlock, outBlock)(a)(b)(c)(d);</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span> }</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span> </div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="keywordtype">void</span> RC6::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="l00070"></a><span class="lineno"> 70</span> <span class="keyword"></span>{</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="keyword">const</span> RC6_WORD *sptr = sTable.end();</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  RC6_WORD a, b, c, d, t, u;</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span> </div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  Block::Get(inBlock)(a)(b)(c)(d);</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span> </div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  sptr -= 2;</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  c -= sptr[1];</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  a -= sptr[0];</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>  <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> i=0; i < r; i++)</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>  sptr -= 2;</div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  t = a; a = d; d = c; c = b; b = t;</div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  u = rotlConstant<5>(d*(2 * d + 1));</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  t = rotlConstant<5>(b*(2 * b + 1));</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  c = <a class="code" href="misc_8h.html#ae8fc34eb834dd2424407d5e4d729594e">rotrMod</a>(c-sptr[1], t) ^ u;</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  a = <a class="code" href="misc_8h.html#ae8fc34eb834dd2424407d5e4d729594e">rotrMod</a>(a-sptr[0], u) ^ t;</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> </div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  d -= sTable[1];</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  b -= sTable[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>  <a class="code" href="class_put_block.html">Block::Put</a>(xorBlock, outBlock)(a)(b)(c)(d);</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> </div><div class="line"><a name="l00096"></a><span class="lineno"> 96</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="class_sec_block_html"><div class="ttname"><a href="class_sec_block.html">SecBlock< RC6_WORD ></a></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="rc6_8h_html"><div class="ttname"><a href="rc6_8h.html">rc6.h</a></div><div class="ttdoc">Classes for the RC6 block cipher. </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="misc_8h_html_af1490597cb11989e78d5ba5b5f21266b"><div class="ttname"><a href="misc_8h.html#af1490597cb11989e78d5ba5b5f21266b">STDMAX</a></div><div class="ttdeci">const T & STDMAX(const T &a, const T &b)</div><div class="ttdoc">Replacement function for std::max. </div><div class="ttdef"><b>Definition:</b> <a href="misc_8h_source.html#l00518">misc.h:518</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="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="misc_8h_html_ad31fe5d559d014085c6a49594b817196"><div class="ttname"><a href="misc_8h.html#ad31fe5d559d014085c6a49594b817196">rotlMod</a></div><div class="ttdeci">T rotlMod(T x, unsigned int y)</div><div class="ttdoc">Performs a left rotate. </div><div class="ttdef"><b>Definition:</b> <a href="misc_8h_source.html#l01502">misc.h:1502</a></div></div>
<div class="ttc" id="misc_8h_html_ae8fc34eb834dd2424407d5e4d729594e"><div class="ttname"><a href="misc_8h.html#ae8fc34eb834dd2424407d5e4d729594e">rotrMod</a></div><div class="ttdeci">T rotrMod(T x, unsigned int y)</div><div class="ttdoc">Performs a right rotate. </div><div class="ttdef"><b>Definition:</b> <a href="misc_8h_source.html#l01518">misc.h:1518</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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