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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++: shark.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>shark.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// shark.cpp - written and placed in the public domain by Wei Dai</span><a name="l00002"></a>00002 <a name="l00003"></a>00003 <span class="preprocessor">#include "pch.h"</span><a name="l00004"></a>00004 <a name="l00005"></a>00005 <span class="preprocessor">#ifdef WORD64_AVAILABLE</span><a name="l00006"></a>00006 <span class="preprocessor"></span><a name="l00007"></a>00007 <span class="preprocessor">#include "<a class="code" href="shark_8h.html">shark.h</a>"</span><a name="l00008"></a>00008 <span class="preprocessor">#include "misc.h"</span><a name="l00009"></a>00009 <span class="preprocessor">#include "<a class="code" href="modes_8h.html">modes.h</a>"</span><a name="l00010"></a>00010 <span class="preprocessor">#include "gf256.h"</span><a name="l00011"></a>00011 <a name="l00012"></a>00012 NAMESPACE_BEGIN(CryptoPP)<a name="l00013"></a>00013 <a name="l00014"></a>00014 static word64 SHARKTransform(word64 a)<a name="l00015"></a>00015 {<a name="l00016"></a>00016 <span class="keyword">static</span> <span class="keyword">const</span> byte iG[8][8] = {<a name="l00017"></a>00017 0xe7, 0x30, 0x90, 0x85, 0xd0, 0x4b, 0x91, 0x41, <a name="l00018"></a>00018 0x53, 0x95, 0x9b, 0xa5, 0x96, 0xbc, 0xa1, 0x68, <a name="l00019"></a>00019 0x02, 0x45, 0xf7, 0x65, 0x5c, 0x1f, 0xb6, 0x52, <a name="l00020"></a>00020 0xa2, 0xca, 0x22, 0x94, 0x44, 0x63, 0x2a, 0xa2, <a name="l00021"></a>00021 0xfc, 0x67, 0x8e, 0x10, 0x29, 0x75, 0x85, 0x71, <a name="l00022"></a>00022 0x24, 0x45, 0xa2, 0xcf, 0x2f, 0x22, 0xc1, 0x0e, <a name="l00023"></a>00023 0xa1, 0xf1, 0x71, 0x40, 0x91, 0x27, 0x18, 0xa5, <a name="l00024"></a>00024 0x56, 0xf4, 0xaf, 0x32, 0xd2, 0xa4, 0xdc, 0x71, <a name="l00025"></a>00025 };<a name="l00026"></a>00026 <a name="l00027"></a>00027 word64 result=0;<a name="l00028"></a>00028 <a class="code" href="class_g_f256.html" title="GF(256) with polynomial basis.">GF256</a> gf256(0xf5);<a name="l00029"></a>00029 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=0; i<8; i++)<a name="l00030"></a>00030 <span class="keywordflow">for</span>(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> j=0; j<8; j++) <a name="l00031"></a>00031 result ^= word64(gf256.Multiply(iG[i][j], <a class="code" href="class_g_f256.html#61d30f3ae84c0b9f99906f34492842f0">GF256::Element</a>(a>>(56-8*j)))) << (56-8*i);<a name="l00032"></a>00032 <span class="keywordflow">return</span> result;<a name="l00033"></a>00033 }<a name="l00034"></a>00034 <a name="l00035"></a>00035 <span class="keywordtype">void</span> SHARK::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" title="interface for retrieving values given their names">NameValuePairs</a> &params)<a name="l00036"></a>00036 {<a name="l00037"></a>00037 AssertValidKeyLength(keyLen);<a name="l00038"></a>00038 <a name="l00039"></a>00039 m_rounds = GetRoundsAndThrowIfInvalid(params, <span class="keyword">this</span>);<a name="l00040"></a>00040 m_roundKeys.New(m_rounds+1);<a name="l00041"></a>00041 <a name="l00042"></a>00042 <span class="comment">// concatenate key enought times to fill a</span><a name="l00043"></a>00043 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=0; i<(m_rounds+1)*8; i++)<a name="l00044"></a>00044 ((byte *)m_roundKeys.begin())[i] = key[i%keyLen];<a name="l00045"></a>00045 <a name="l00046"></a>00046 <a class="code" href="class_block_cipher.html" title="interface for one direction (encryption or decryption) of a block cipher">SHARK::Encryption</a> e;<a name="l00047"></a>00047 e.InitForKeySetup();<a name="l00048"></a>00048 byte <a class="code" href="namespace_name.html#9b6839240a8bdf1f5bcbebf1866f4733" title="const byte *">IV</a>[8] = {0,0,0,0,0,0,0,0};<a name="l00049"></a>00049 <a class="code" href="class_cipher_mode_final_template___external_cipher.html" title="_">CFB_Mode_ExternalCipher::Encryption</a> cfb(e, IV);<a name="l00050"></a>00050 <a name="l00051"></a>00051 cfb.ProcessString((byte *)m_roundKeys.begin(), (m_rounds+1)*8);<a name="l00052"></a>00052 <a name="l00053"></a>00053 ConditionalByteReverse(<a class="code" href="cryptlib_8h.html#aeb92d42f5a6e27b8ba19f18d69d142bf0c3bb6c718cc7ff0bffef4e8f178c57">BIG_ENDIAN_ORDER</a>, m_roundKeys.begin(), m_roundKeys.begin(), (m_rounds+1)*8);<a name="l00054"></a>00054 <a name="l00055"></a>00055 m_roundKeys[m_rounds] = SHARKTransform(m_roundKeys[m_rounds]);<a name="l00056"></a>00056 <a name="l00057"></a>00057 <span class="keywordflow">if</span> (!IsForwardTransformation())<a name="l00058"></a>00058 {<a name="l00059"></a>00059 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i;<a name="l00060"></a>00060 <a name="l00061"></a>00061 <span class="comment">// transform encryption round keys into decryption round keys</span><a name="l00062"></a>00062 <span class="keywordflow">for</span> (i=0; i<m_rounds/2; i++)<a name="l00063"></a>00063 <a class="code" href="gf2n_8h.html#cd9c045f0b5c2a7595a8a0872dc80f59">std::swap</a>(m_roundKeys[i], m_roundKeys[m_rounds-i]);<a name="l00064"></a>00064 <a name="l00065"></a>00065 <span class="keywordflow">for</span> (i=1; i<m_rounds; i++)<a name="l00066"></a>00066 m_roundKeys[i] = SHARKTransform(m_roundKeys[i]);<a name="l00067"></a>00067 }<a name="l00068"></a>00068 <a name="l00069"></a>00069 <span class="preprocessor">#ifdef IS_LITTLE_ENDIAN</span><a name="l00070"></a>00070 <span class="preprocessor"></span> m_roundKeys[0] = ByteReverse(m_roundKeys[0]);<a name="l00071"></a>00071 m_roundKeys[m_rounds] = ByteReverse(m_roundKeys[m_rounds]);<a name="l00072"></a>00072 <span class="preprocessor">#endif</span><a name="l00073"></a>00073 <span class="preprocessor"></span>}<a name="l00074"></a>00074 <a name="l00075"></a>00075 <span class="comment">// construct an SHARK_Enc object with fixed round keys, to be used to initialize actual round keys</span><a name="l00076"></a>00076 <span class="keywordtype">void</span> SHARK::Enc::InitForKeySetup()<a name="l00077"></a>00077 {<a name="l00078"></a>00078 m_rounds = DEFAULT_ROUNDS;<a name="l00079"></a>00079 m_roundKeys.New(DEFAULT_ROUNDS+1);<a name="l00080"></a>00080 <a name="l00081"></a>00081 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=0; i<DEFAULT_ROUNDS; i++)<a name="l00082"></a>00082 m_roundKeys[i] = cbox[0][i];<a name="l00083"></a>00083 <a name="l00084"></a>00084 m_roundKeys[DEFAULT_ROUNDS] = SHARKTransform(cbox[0][DEFAULT_ROUNDS]);<a name="l00085"></a>00085 <a name="l00086"></a>00086 <span class="preprocessor">#ifdef IS_LITTLE_ENDIAN</span><a name="l00087"></a>00087 <span class="preprocessor"></span> m_roundKeys[0] = ByteReverse(m_roundKeys[0]);<a name="l00088"></a>00088 m_roundKeys[m_rounds] = ByteReverse(m_roundKeys[m_rounds]);<a name="l00089"></a>00089 <span class="preprocessor">#endif</span><a name="l00090"></a>00090 <span class="preprocessor"></span>}<a name="l00091"></a>00091 <a name="l00092"></a>00092 <span class="keyword">typedef</span> word64 ArrayOf256Word64s[256];<a name="l00093"></a>00093 <a name="l00094"></a>00094 <span class="keyword">template</span> <const byte *sbox, const ArrayOf256Word64s *cbox><a name="l00095"></a><a class="code" href="struct_shark_process_and_xor_block.html">00095</a> <span class="keyword">struct </span><a class="code" href="struct_shark_process_and_xor_block.html">SharkProcessAndXorBlock</a>{ <span class="comment">// VC60 workaround: problem with template functions</span><a name="l00096"></a><a class="code" href="struct_shark_process_and_xor_block.html#a1aa59e33174e68fd1eb2593b35df64d">00096</a> <span class="keyword">inline</span> <a class="code" href="struct_shark_process_and_xor_block.html#a1aa59e33174e68fd1eb2593b35df64d">SharkProcessAndXorBlock</a>(<span class="keyword">const</span> word64 *roundKeys, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> rounds, <span class="keyword">const</span> byte *inBlock, <span class="keyword">const</span> byte *xorBlock, byte *outBlock)<a name="l00097"></a>00097 {<a name="l00098"></a>00098 word64 tmp = *(word64 *)inBlock ^ roundKeys[0];<a name="l00099"></a>00099 <a name="l00100"></a>00100 <a class="code" href="cryptlib_8h.html#aeb92d42f5a6e27b8ba19f18d69d142b">ByteOrder</a> order = GetNativeByteOrder();<a name="l00101"></a>00101 tmp = cbox[0][GetByte(order, tmp, 0)] ^ cbox[1][GetByte(order, tmp, 1)] <a name="l00102"></a>00102 ^ cbox[2][GetByte(order, tmp, 2)] ^ cbox[3][GetByte(order, tmp, 3)] <a name="l00103"></a>00103 ^ cbox[4][GetByte(order, tmp, 4)] ^ cbox[5][GetByte(order, tmp, 5)] <a name="l00104"></a>00104 ^ cbox[6][GetByte(order, tmp, 6)] ^ cbox[7][GetByte(order, tmp, 7)]<a name="l00105"></a>00105 ^ roundKeys[1];<a name="l00106"></a>00106 <a name="l00107"></a>00107 <span class="keywordflow">for</span>(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=2; i<rounds; i++) <a name="l00108"></a>00108 {<a name="l00109"></a>00109 tmp = cbox[0][GETBYTE(tmp, 7)] ^ cbox[1][GETBYTE(tmp, 6)] <a name="l00110"></a>00110 ^ cbox[2][GETBYTE(tmp, 5)] ^ cbox[3][GETBYTE(tmp, 4)] <a name="l00111"></a>00111 ^ cbox[4][GETBYTE(tmp, 3)] ^ cbox[5][GETBYTE(tmp, 2)] <a name="l00112"></a>00112 ^ cbox[6][GETBYTE(tmp, 1)] ^ cbox[7][GETBYTE(tmp, 0)]<a name="l00113"></a>00113 ^ roundKeys[i];<a name="l00114"></a>00114 }<a name="l00115"></a>00115 <a name="l00116"></a>00116 <a class="code" href="class_put_block.html">PutBlock<byte, BigEndian></a>(xorBlock, outBlock)<a name="l00117"></a>00117 (sbox[GETBYTE(tmp, 7)])<a name="l00118"></a>00118 (sbox[GETBYTE(tmp, 6)])<a name="l00119"></a>00119 (sbox[GETBYTE(tmp, 5)])<a name="l00120"></a>00120 (sbox[GETBYTE(tmp, 4)])<a name="l00121"></a>00121 (sbox[GETBYTE(tmp, 3)])<a name="l00122"></a>00122 (sbox[GETBYTE(tmp, 2)])<a name="l00123"></a>00123 (sbox[GETBYTE(tmp, 1)])<a name="l00124"></a>00124 (sbox[GETBYTE(tmp, 0)]);<a name="l00125"></a>00125 <a name="l00126"></a>00126 *(word64 *)outBlock ^= roundKeys[rounds];<a name="l00127"></a>00127 }};<a name="l00128"></a>00128 <a name="l00129"></a>00129 <span class="keywordtype">void</span> SHARK::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="l00130"></a>00130 <span class="keyword"></span>{<a name="l00131"></a>00131 <a class="code" href="struct_shark_process_and_xor_block.html">SharkProcessAndXorBlock<sbox, cbox></a>(m_roundKeys, m_rounds, inBlock, xorBlock, outBlock);<a name="l00132"></a>00132 }<a name="l00133"></a>00133 <a name="l00134"></a>00134 <span class="keywordtype">void</span> SHARK::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="l00135"></a>00135 <span class="keyword"></span>{<a name="l00136"></a>00136 <a class="code" href="struct_shark_process_and_xor_block.html">SharkProcessAndXorBlock<sbox, cbox></a>(m_roundKeys, m_rounds, inBlock, xorBlock, outBlock);<a name="l00137"></a>00137 }<a name="l00138"></a>00138 <a name="l00139"></a>00139 NAMESPACE_END<a name="l00140"></a>00140 <a name="l00141"></a>00141 <span class="preprocessor">#endif // WORD64_AVAILABLE</span></pre></div><hr size="1"><address style="text-align: right;"><small>Generated on Fri Jun 1 11:11:24 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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