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<div class="title">3way.cpp</div> </div>
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<div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// 3way.cpp - modifed by Wei Dai from Joan Daemen's 3way.c</span>
<a name="l00002"></a>00002 <span class="comment">// The original code and all modifications are in the public domain.</span>
<a name="l00003"></a>00003
<a name="l00004"></a>00004 <span class="preprocessor">#include "pch.h"</span>
<a name="l00005"></a>00005 <span class="preprocessor">#include "<a class="code" href="3way_8h.html">3way.h</a>"</span>
<a name="l00006"></a>00006 <span class="preprocessor">#include "misc.h"</span>
<a name="l00007"></a>00007
<a name="l00008"></a>00008 NAMESPACE_BEGIN(CryptoPP)
<a name="l00009"></a>00009
<a name="l00010"></a>00010 void ThreeWay_TestInstantiations()
<a name="l00011"></a>00011 {
<a name="l00012"></a>00012 <a class="code" href="class_block_cipher_final.html">ThreeWay::Encryption</a> x1;
<a name="l00013"></a>00013 <a class="code" href="class_block_cipher_final.html">ThreeWay::Decryption</a> x2;
<a name="l00014"></a>00014 }
<a name="l00015"></a>00015
<a name="l00016"></a>00016 <span class="keyword">static</span> <span class="keyword">const</span> word32 START_E = 0x0b0b; <span class="comment">// round constant of first encryption round</span>
<a name="l00017"></a>00017 <span class="keyword">static</span> <span class="keyword">const</span> word32 START_D = 0xb1b1; <span class="comment">// round constant of first decryption round</span>
<a name="l00018"></a>00018 <span class="keyword">static</span> <span class="keyword">const</span> word32 RC_MODULUS = 0x11011;
<a name="l00019"></a>00019
<a name="l00020"></a>00020 <span class="keyword">static</span> <span class="keyword">inline</span> word32 reverseBits(word32 a)
<a name="l00021"></a>00021 {
<a name="l00022"></a>00022 a = ((a & 0xAAAAAAAA) >> 1) | ((a & 0x55555555) << 1);
<a name="l00023"></a>00023 a = ((a & 0xCCCCCCCC) >> 2) | ((a & 0x33333333) << 2);
<a name="l00024"></a>00024 <span class="keywordflow">return</span> ((a & 0xF0F0F0F0) >> 4) | ((a & 0x0F0F0F0F) << 4);
<a name="l00025"></a>00025 }
<a name="l00026"></a>00026
<a name="l00027"></a>00027 <span class="preprocessor">#define mu(a0, a1, a2) \</span>
<a name="l00028"></a>00028 <span class="preprocessor">{ \</span>
<a name="l00029"></a>00029 <span class="preprocessor"> a1 = reverseBits(a1); \</span>
<a name="l00030"></a>00030 <span class="preprocessor"> word32 t = reverseBits(a0); \</span>
<a name="l00031"></a>00031 <span class="preprocessor"> a0 = reverseBits(a2); \</span>
<a name="l00032"></a>00032 <span class="preprocessor"> a2 = t; \</span>
<a name="l00033"></a>00033 <span class="preprocessor">}</span>
<a name="l00034"></a>00034 <span class="preprocessor"></span>
<a name="l00035"></a>00035 <span class="preprocessor">#define pi_gamma_pi(a0, a1, a2) \</span>
<a name="l00036"></a>00036 <span class="preprocessor">{ \</span>
<a name="l00037"></a>00037 <span class="preprocessor"> word32 b0, b2; \</span>
<a name="l00038"></a>00038 <span class="preprocessor"> b2 = rotlFixed(a2, 1U); \</span>
<a name="l00039"></a>00039 <span class="preprocessor"> b0 = rotlFixed(a0, 22U); \</span>
<a name="l00040"></a>00040 <span class="preprocessor"> a0 = rotlFixed(b0 ^ (a1|(~b2)), 1U); \</span>
<a name="l00041"></a>00041 <span class="preprocessor"> a2 = rotlFixed(b2 ^ (b0|(~a1)), 22U);\</span>
<a name="l00042"></a>00042 <span class="preprocessor"> a1 ^= (b2|(~b0)); \</span>
<a name="l00043"></a>00043 <span class="preprocessor">}</span>
<a name="l00044"></a>00044 <span class="preprocessor"></span>
<a name="l00045"></a>00045 <span class="comment">// thanks to Paulo Barreto for this optimized theta()</span>
<a name="l00046"></a>00046 <span class="preprocessor">#define theta(a0, a1, a2) \</span>
<a name="l00047"></a>00047 <span class="preprocessor">{ \</span>
<a name="l00048"></a>00048 <span class="preprocessor"> word32 b0, b1, c; \</span>
<a name="l00049"></a>00049 <span class="preprocessor"> c = a0 ^ a1 ^ a2; \</span>
<a name="l00050"></a>00050 <span class="preprocessor"> c = rotlFixed(c, 16U) ^ rotlFixed(c, 8U); \</span>
<a name="l00051"></a>00051 <span class="preprocessor"> b0 = (a0 << 24) ^ (a2 >> 8) ^ (a1 << 8) ^ (a0 >> 24); \</span>
<a name="l00052"></a>00052 <span class="preprocessor"> b1 = (a1 << 24) ^ (a0 >> 8) ^ (a2 << 8) ^ (a1 >> 24); \</span>
<a name="l00053"></a>00053 <span class="preprocessor"> a0 ^= c ^ b0; \</span>
<a name="l00054"></a>00054 <span class="preprocessor"> a1 ^= c ^ b1; \</span>
<a name="l00055"></a>00055 <span class="preprocessor"> a2 ^= c ^ (b0 >> 16) ^ (b1 << 16); \</span>
<a name="l00056"></a>00056 <span class="preprocessor">} </span>
<a name="l00057"></a>00057 <span class="preprocessor"></span>
<a name="l00058"></a>00058 <span class="preprocessor">#define rho(a0, a1, a2) \</span>
<a name="l00059"></a>00059 <span class="preprocessor">{ \</span>
<a name="l00060"></a>00060 <span class="preprocessor"> theta(a0, a1, a2); \</span>
<a name="l00061"></a>00061 <span class="preprocessor"> pi_gamma_pi(a0, a1, a2); \</span>
<a name="l00062"></a>00062 <span class="preprocessor">} </span>
<a name="l00063"></a>00063 <span class="preprocessor"></span>
<a name="l00064"></a>00064 <span class="keywordtype">void</span> ThreeWay::Base::UncheckedSetKey(<span class="keyword">const</span> byte *uk, <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" title="interface for retrieving values given their names">NameValuePairs</a> &params)
<a name="l00065"></a>00065 {
<a name="l00066"></a>00066 AssertValidKeyLength(length);
<a name="l00067"></a>00067
<a name="l00068"></a>00068 m_rounds = GetRoundsAndThrowIfInvalid(params, <span class="keyword">this</span>);
<a name="l00069"></a>00069
<a name="l00070"></a>00070 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=0; i<3; i++)
<a name="l00071"></a>00071 m_k[i] = (word32)uk[4*i+3] | ((word32)uk[4*i+2]<<8) | ((word32)uk[4*i+1]<<16) | ((word32)uk[4*i]<<24);
<a name="l00072"></a>00072
<a name="l00073"></a>00073 <span class="keywordflow">if</span> (!IsForwardTransformation())
<a name="l00074"></a>00074 {
<a name="l00075"></a>00075 theta(m_k[0], m_k[1], m_k[2]);
<a name="l00076"></a>00076 mu(m_k[0], m_k[1], m_k[2]);
<a name="l00077"></a>00077 m_k[0] = ByteReverse(m_k[0]);
<a name="l00078"></a>00078 m_k[1] = ByteReverse(m_k[1]);
<a name="l00079"></a>00079 m_k[2] = ByteReverse(m_k[2]);
<a name="l00080"></a>00080 }
<a name="l00081"></a>00081 }
<a name="l00082"></a>00082
<a name="l00083"></a>00083 <span class="keywordtype">void</span> ThreeWay::Enc::ProcessAndXorBlock(<span class="keyword">const</span> byte *inBlock, <span class="keyword">const</span> byte *xorBlock, byte *outBlock)<span class="keyword"> const</span>
<a name="l00084"></a>00084 <span class="keyword"></span>{
<a name="l00085"></a>00085 <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>;
<a name="l00086"></a>00086
<a name="l00087"></a>00087 word32 a0, a1, a2;
<a name="l00088"></a>00088 Block::Get(inBlock)(a0)(a1)(a2);
<a name="l00089"></a>00089
<a name="l00090"></a>00090 word32 rc = START_E;
<a name="l00091"></a>00091
<a name="l00092"></a>00092 <span class="keywordflow">for</span>(<span class="keywordtype">unsigned</span> i=0; i<m_rounds; i++)
<a name="l00093"></a>00093 {
<a name="l00094"></a>00094 a0 ^= m_k[0] ^ (rc<<16);
<a name="l00095"></a>00095 a1 ^= m_k[1];
<a name="l00096"></a>00096 a2 ^= m_k[2] ^ rc;
<a name="l00097"></a>00097 rho(a0, a1, a2);
<a name="l00098"></a>00098
<a name="l00099"></a>00099 rc <<= 1;
<a name="l00100"></a>00100 <span class="keywordflow">if</span> (rc&0x10000) rc ^= 0x11011;
<a name="l00101"></a>00101 }
<a name="l00102"></a>00102 a0 ^= m_k[0] ^ (rc<<16);
<a name="l00103"></a>00103 a1 ^= m_k[1];
<a name="l00104"></a>00104 a2 ^= m_k[2] ^ rc;
<a name="l00105"></a>00105 theta(a0, a1, a2);
<a name="l00106"></a>00106
<a name="l00107"></a>00107 <a class="code" href="class_put_block.html">Block::Put</a>(xorBlock, outBlock)(a0)(a1)(a2);
<a name="l00108"></a>00108 }
<a name="l00109"></a>00109
<a name="l00110"></a>00110 <span class="keywordtype">void</span> ThreeWay::Dec::ProcessAndXorBlock(<span class="keyword">const</span> byte *inBlock, <span class="keyword">const</span> byte *xorBlock, byte *outBlock)<span class="keyword"> const</span>
<a name="l00111"></a>00111 <span class="keyword"></span>{
<a name="l00112"></a>00112 <span class="keyword">typedef</span> <a class="code" href="struct_block_get_and_put.html">BlockGetAndPut<word32, LittleEndian></a> Block;
<a name="l00113"></a>00113
<a name="l00114"></a>00114 word32 a0, a1, a2;
<a name="l00115"></a>00115 Block::Get(inBlock)(a0)(a1)(a2);
<a name="l00116"></a>00116
<a name="l00117"></a>00117 word32 rc = START_D;
<a name="l00118"></a>00118
<a name="l00119"></a>00119 mu(a0, a1, a2);
<a name="l00120"></a>00120 <span class="keywordflow">for</span>(<span class="keywordtype">unsigned</span> i=0; i<m_rounds; i++)
<a name="l00121"></a>00121 {
<a name="l00122"></a>00122 a0 ^= m_k[0] ^ (rc<<16);
<a name="l00123"></a>00123 a1 ^= m_k[1];
<a name="l00124"></a>00124 a2 ^= m_k[2] ^ rc;
<a name="l00125"></a>00125 rho(a0, a1, a2);
<a name="l00126"></a>00126
<a name="l00127"></a>00127 rc <<= 1;
<a name="l00128"></a>00128 <span class="keywordflow">if</span> (rc&0x10000) rc ^= 0x11011;
<a name="l00129"></a>00129 }
<a name="l00130"></a>00130 a0 ^= m_k[0] ^ (rc<<16);
<a name="l00131"></a>00131 a1 ^= m_k[1];
<a name="l00132"></a>00132 a2 ^= m_k[2] ^ rc;
<a name="l00133"></a>00133 theta(a0, a1, a2);
<a name="l00134"></a>00134 mu(a0, a1, a2);
<a name="l00135"></a>00135
<a name="l00136"></a>00136 <a class="code" href="class_put_block.html">Block::Put</a>(xorBlock, outBlock)(a0)(a1)(a2);
<a name="l00137"></a>00137 }
<a name="l00138"></a>00138
<a name="l00139"></a>00139 NAMESPACE_END
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