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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">rc2.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">// rc2.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="rc2_8h.html">rc2.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> <span class="preprocessor">#include "<a class="code" href="argnames_8h.html">argnames.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="keywordtype">void</span> RC2::Base::UncheckedSetKey(<span class="keyword">const</span> byte *key, <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="l00011"></a><span class="lineno"> 11</span> {</div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span>  AssertValidKeyLength(keyLen);</div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> </div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span>  <span class="keywordtype">int</span> effectiveLen = params.<a class="code" href="class_name_value_pairs.html#a7ddb654b7afcd1a04422a7b4b01366d9">GetIntValueWithDefault</a>(<a class="code" href="namespace_name.html#a8e61b2d95662464a57395892801c47dd">Name::EffectiveKeyLength</a>(), DEFAULT_EFFECTIVE_KEYLENGTH);</div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span>  <span class="keywordflow">if</span> (effectiveLen > MAX_EFFECTIVE_KEYLENGTH)</div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span>  <span class="keywordflow">throw</span> <a class="code" href="class_invalid_argument.html">InvalidArgument</a>(<span class="stringliteral">"RC2: effective key length parameter exceeds maximum"</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">static</span> <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> PITABLE[256] = {</div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  217,120,249,196, 25,221,181,237, 40,233,253,121, 74,160,216,157,</div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span>  198,126, 55,131, 43,118, 83,142, 98, 76,100,136, 68,139,251,162,</div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  23,154, 89,245,135,179, 79, 19, 97, 69,109,141, 9,129,125, 50,</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  189,143, 64,235,134,183,123, 11,240,149, 33, 34, 92,107, 78,130,</div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  84,214,101,147,206, 96,178, 28,115, 86,192, 20,167,140,241,220,</div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  18,117,202, 31, 59,190,228,209, 66, 61,212, 48,163, 60,182, 38,</div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  111,191, 14,218, 70,105, 7, 87, 39,242, 29,155,188,148, 67, 3,</div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  248, 17,199,246,144,239, 62,231, 6,195,213, 47,200,102, 30,215,</div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  8,232,234,222,128, 82,238,247,132,170,114,172, 53, 77,106, 42,</div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  150, 26,210,113, 90, 21, 73,116, 75,159,208, 94, 4, 24,164,236,</div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  194,224, 65,110, 15, 81,203,204, 36,145,175, 80,161,244,112, 57,</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  153,124, 58,133, 35,184,180,122,252, 2, 54, 91, 37, 85,151, 49,</div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  45, 93,250,152,227,138,146,174, 5,223, 41, 16,103,108,186,201,</div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  211, 0,230,207,225,158,168, 44, 99, 22, 1, 63, 88,226,137,169,</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  13, 56, 52, 27,171, 51,255,176,187, 72, 12, 95,185,177,205, 46,</div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  197,243,219, 71,229,165,156,119, 10,166, 32,104,254,127,193,173};</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 class="code" href="class_sec_byte_block.html">SecByteBlock</a> L(128);</div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  memcpy(L, key, keyLen);</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>  <span class="keywordtype">int</span> i;</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="keywordflow">for</span> (i=keyLen; i<128; i++)</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  L[i] = PITABLE[(L[i-1] + L[i-keyLen]) & 255];</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">unsigned</span> <span class="keywordtype">int</span> T8 = (effectiveLen+7) / 8;</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  byte TM = byte((<span class="keywordtype">int</span>)255 >> ((8-(effectiveLen%8))%8));</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  L[128-T8] = PITABLE[L[128-T8] & TM];</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="keywordflow">for</span> (i=127-T8; i>=0; i--)</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  L[i] = PITABLE[L[i+1] ^ L[i+T8]];</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="keywordflow">for</span> (i=0; i<64; i++)</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  K[i] = L[2*i] + (L[2*i+1] << 8);</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> </div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="keyword">typedef</span> <a class="code" href="struct_block_get_and_put.html">BlockGetAndPut<word16, LittleEndian></a> <a class="code" href="struct_block_get_and_put.html">Block</a>;</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> <span class="keywordtype">void</span> RC2::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="l00057"></a><span class="lineno"> 57</span> <span class="keyword"></span>{</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  word16 R0, R1, R2, R3;</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  Block::Get(inBlock)(R0)(R1)(R2)(R3);</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">for</span> (<span class="keywordtype">int</span> i = 0; i < 16; i++)</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>  R0 += (R1 & ~R3) + (R2 & R3) + K[4*i+0];</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  R0 = rotlConstant<1>(R0);</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>  R1 += (R2 & ~R0) + (R3 & R0) + K[4*i+1];</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  R1 = rotlConstant<2>(R1);</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>  R2 += (R3 & ~R1) + (R0 & R1) + K[4*i+2];</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  R2 = rotlConstant<3>(R2);</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>  R3 += (R0 & ~R2) + (R1 & R2) + K[4*i+3];</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  R3 = rotlConstant<5>(R3);</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">if</span> (i == 4 || i == 10)</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>  R0 = word16(R0 + K[R3 & 63]);</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  R1 = word16(R1 + K[R0 & 63]);</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  R2 = word16(R2 + K[R1 & 63]);</div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  R3 = word16(R3 + K[R2 & 63]);</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>  }</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>  <a class="code" href="class_put_block.html">Block::Put</a>(xorBlock, outBlock)(R0)(R1)(R2)(R3);</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> </div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="keywordtype">void</span> RC2::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="l00088"></a><span class="lineno"> 88</span> <span class="keyword"></span>{</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  word16 R0, R1, R2, R3;</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  Block::Get(inBlock)(R0)(R1)(R2)(R3);</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span> </div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 15; i >= 0; i--)</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>  <span class="keywordflow">if</span> (i == 4 || i == 10)</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>  R3 = word16(R3 - K[R2 & 63]);</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  R2 = word16(R2 - K[R1 & 63]);</div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  R1 = word16(R1 - K[R0 & 63]);</div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  R0 = word16(R0 - K[R3 & 63]);</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  }</div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span> </div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  R3 = rotrConstant<5>(R3);</div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  R3 = word16(R3 - ((R0 & ~R2) + (R1 & R2) + K[4*i+3]));</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>  R2 = rotrConstant<3>(R2);</div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  R2 = word16(R2 - ((R3 & ~R1) + (R0 & R1) + K[4*i+2]));</div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span> </div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  R1 = rotrConstant<2>(R1);</div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  R1 = word16(R1 - ((R2 & ~R0) + (R3 & R0) + K[4*i+1]));</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>  R0 = rotrConstant<1>(R0);</div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  R0 = word16(R0 - ((R1 & ~R3) + (R2 & R3) + K[4*i+0]));</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> </div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <a class="code" href="class_put_block.html">Block::Put</a>(xorBlock, outBlock)(R0)(R1)(R2)(R3);</div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span> }</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span> </div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span> NAMESPACE_END</div><div class="ttc" id="class_name_value_pairs_html_a7ddb654b7afcd1a04422a7b4b01366d9"><div class="ttname"><a href="class_name_value_pairs.html#a7ddb654b7afcd1a04422a7b4b01366d9">NameValuePairs::GetIntValueWithDefault</a></div><div class="ttdeci">int GetIntValueWithDefault(const char *name, int defaultValue) const</div><div class="ttdoc">Get a named value with type int, with default. </div><div class="ttdef"><b>Definition:</b> <a href="cryptlib_8h_source.html#l00392">cryptlib.h:392</a></div></div>
<div class="ttc" id="argnames_8h_html"><div class="ttname"><a href="argnames_8h.html">argnames.h</a></div><div class="ttdoc">Standard names for retrieving values by name when working with NameValuePairs. </div></div>
<div class="ttc" id="class_invalid_argument_html"><div class="ttname"><a href="class_invalid_argument.html">InvalidArgument</a></div><div class="ttdoc">An invalid argument was detected. </div><div class="ttdef"><b>Definition:</b> <a href="cryptlib_8h_source.html#l00199">cryptlib.h:199</a></div></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="rc2_8h_html"><div class="ttname"><a href="rc2_8h.html">rc2.h</a></div><div class="ttdoc">Classes for the RC2 block cipher. </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_sec_byte_block_html"><div class="ttname"><a href="class_sec_byte_block.html">SecByteBlock</a></div><div class="ttdoc">SecBlock<byte> typedef. </div><div class="ttdef"><b>Definition:</b> <a href="secblock_8h_source.html#l00822">secblock.h:822</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_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="namespace_name_html_a8e61b2d95662464a57395892801c47dd"><div class="ttname"><a href="namespace_name.html#a8e61b2d95662464a57395892801c47dd">Name::EffectiveKeyLength</a></div><div class="ttdeci">const char * EffectiveKeyLength()</div><div class="ttdoc">int, in bits </div><div class="ttdef"><b>Definition:</b> <a href="argnames_8h_source.html#l00028">argnames.h:28</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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