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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8"><title>Crypto++: 3way.cpp Source File</title><link href="doxygen.css" rel="stylesheet" type="text/css"><link href="tabs.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.5.2 --><div class="tabs"> <ul> <li><a href="index.html"><span>Main Page</span></a></li> <li><a href="namespaces.html"><span>Namespaces</span></a></li> <li><a href="classes.html"><span>Classes</span></a></li> <li class="current"><a href="files.html"><span>Files</span></a></li> </ul></div><div class="tabs"> <ul> <li><a href="files.html"><span>File List</span></a></li> <li><a href="globals.html"><span>File Members</span></a></li> </ul></div><h1>3way.cpp</h1><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 <a class="code" href="struct_block_get_and_put.html#07781cc0817613fe47e8070999cf4b95">Block::Get</a>(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="struct_block_get_and_put.html#63d96a17e8118407e02896d0b0f8d92d">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 <a class="code" href="struct_block_get_and_put.html#07781cc0817613fe47e8070999cf4b95">Block::Get</a>(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="struct_block_get_and_put.html#63d96a17e8118407e02896d0b0f8d92d">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</pre></div><hr size="1"><address style="text-align: right;"><small>Generated on Fri Jun 1 11:11:19 2007 for Crypto++ by <a href="http://www.doxygen.org/index.html"><img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.2 </small></address></body></html>⌨️ 快捷键说明
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