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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>Crypto++: square.cpp Source File</title><link href="doxygen.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.3.2 --><div class="qindex"><a class="qindex" href="index.html">Main Page</a> | <a class="qindex" href="namespaces.html">Namespace List</a> | <a class="qindex" href="hierarchy.html">Class Hierarchy</a> | <a class="qindex" href="classes.html">Alphabetical List</a> | <a class="qindex" href="annotated.html">Compound List</a> | <a class="qindex" href="files.html">File List</a> | <a class="qindex" href="namespacemembers.html">Namespace Members</a> | <a class="qindex" href="functions.html">Compound Members</a> | <a class="qindex" href="globals.html">File Members</a></div><h1>square.cpp</h1><div class="fragment"><pre>00001 <span class="comment">// square.cpp - written and placed in the public domain by Wei Dai</span>00002 <span class="comment">// Based on Paulo S.L.M. Barreto's public domain implementation</span>00003 00004 <span class="preprocessor">#include "pch.h"</span>00005 <span class="preprocessor">#include "<a class="code" href="square_8h.html">square.h</a>"</span>00006 <span class="preprocessor">#include "misc.h"</span>00007 <span class="preprocessor">#include "gf256.h"</span>00008 00009 NAMESPACE_BEGIN(CryptoPP)00010 00011 <span class="comment">// apply theta to a roundkey</span>00012 <span class="keyword">static</span> <span class="keywordtype">void</span> SquareTransform (word32 in[4], word32 out[4])00013 {00014 <span class="keyword">static</span> <span class="keyword">const</span> byte G[4][4] = 00015 {00016 0x02U, 0x01U, 0x01U, 0x03U, 00017 0x03U, 0x02U, 0x01U, 0x01U, 00018 0x01U, 0x03U, 0x02U, 0x01U, 00019 0x01U, 0x01U, 0x03U, 0x02U00020 };00021 00022 <a class="code" href="class_g_f256.html">GF256</a> gf256(0xf5);00023 00024 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < 4; i++)00025 {00026 word32 temp = 0;00027 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> j = 0; j < 4; j++)00028 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> k = 0; k < 4; k++)00029 temp ^= (word32)gf256.<a class="code" href="class_g_f256.html#_g_f256a11">Multiply</a>(GETBYTE(in[i], 3-k), G[k][j]) << ((3-j)*8);00030 out[i] = temp;00031 }00032 }00033 00034 <span class="keywordtype">void</span> Square::Base::UncheckedSetKey(CipherDir dir, <span class="keyword">const</span> byte *userKey, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> length)00035 {00036 AssertValidKeyLength(length);00037 00038 <span class="keyword">static</span> <span class="keyword">const</span> word32 offset[ROUNDS] = {00039 0x01000000UL, 0x02000000UL, 0x04000000UL, 0x08000000UL,00040 0x10000000UL, 0x20000000UL, 0x40000000UL, 0x80000000UL,00041 };00042 00043 GetUserKey(BIG_ENDIAN_ORDER, roundkeys[0], KEYLENGTH/4, userKey, KEYLENGTH);00044 00045 <span class="comment">/* apply the key evolution function */</span>00046 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 1; i < ROUNDS+1; i++)00047 {00048 roundkeys[i][0] = roundkeys[i-1][0] ^ rotlFixed(roundkeys[i-1][3], 8U) ^ offset[i-1];00049 roundkeys[i][1] = roundkeys[i-1][1] ^ roundkeys[i][0];00050 roundkeys[i][2] = roundkeys[i-1][2] ^ roundkeys[i][1];00051 roundkeys[i][3] = roundkeys[i-1][3] ^ roundkeys[i][2];00052 } 00053 00054 <span class="comment">/* produce the round keys */</span>00055 <span class="keywordflow">if</span> (dir == ENCRYPTION)00056 {00057 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < ROUNDS; i++)00058 SquareTransform (roundkeys[i], roundkeys[i]);00059 }00060 <span class="keywordflow">else</span>00061 {00062 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < ROUNDS/2; i++)00063 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> j = 0; j < 4; j++)00064 std::swap(roundkeys[i][j], roundkeys[ROUNDS-i][j]);00065 SquareTransform (roundkeys[ROUNDS], roundkeys[ROUNDS]);00066 }00067 }00068 00069 <span class="preprocessor">#define MSB(x) (((x) >> 24) & 0xffU) </span><span class="comment">/* most significant byte */</span>00070 <span class="preprocessor">#define SSB(x) (((x) >> 16) & 0xffU) </span><span class="comment">/* second in significance */</span>00071 <span class="preprocessor">#define TSB(x) (((x) >> 8) & 0xffU) </span><span class="comment">/* third in significance */</span>00072 <span class="preprocessor">#define LSB(x) (((x) ) & 0xffU) </span><span class="comment">/* least significant byte */</span>00073 00074 <span class="preprocessor">#define squareRound(text, temp, T0, T1, T2, T3, roundkey) \</span>00075 <span class="preprocessor">{ \</span>00076 <span class="preprocessor"> temp[0] = T0[MSB (text[0])] \</span>00077 <span class="preprocessor"> ^ T1[MSB (text[1])] \</span>00078 <span class="preprocessor"> ^ T2[MSB (text[2])] \</span>00079 <span class="preprocessor"> ^ T3[MSB (text[3])] \</span>00080 <span class="preprocessor"> ^ roundkey[0]; \</span>00081 <span class="preprocessor"> temp[1] = T0[SSB (text[0])] \</span>00082 <span class="preprocessor"> ^ T1[SSB (text[1])] \</span>00083 <span class="preprocessor"> ^ T2[SSB (text[2])] \</span>00084 <span class="preprocessor"> ^ T3[SSB (text[3])] \</span>00085 <span class="preprocessor"> ^ roundkey[1]; \</span>00086 <span class="preprocessor"> temp[2] = T0[TSB (text[0])] \</span>00087 <span class="preprocessor"> ^ T1[TSB (text[1])] \</span>00088 <span class="preprocessor"> ^ T2[TSB (text[2])] \</span>00089 <span class="preprocessor"> ^ T3[TSB (text[3])] \</span>00090 <span class="preprocessor"> ^ roundkey[2]; \</span>00091 <span class="preprocessor"> temp[3] = T0[LSB (text[0])] \</span>00092 <span class="preprocessor"> ^ T1[LSB (text[1])] \</span>00093 <span class="preprocessor"> ^ T2[LSB (text[2])] \</span>00094 <span class="preprocessor"> ^ T3[LSB (text[3])] \</span>00095 <span class="preprocessor"> ^ roundkey[3]; \</span>00096 <span class="preprocessor">} </span><span class="comment">/* squareRound */</span>00097 00098 <span class="preprocessor">#define squareFinal(text, temp, S, roundkey) \</span>00099 <span class="preprocessor">{ \</span>00100 <span class="preprocessor"> text[0] = ((word32) (S[MSB (temp[0])]) << 24) \</span>00101 <span class="preprocessor"> ^ ((word32) (S[MSB (temp[1])]) << 16) \</span>00102 <span class="preprocessor"> ^ ((word32) (S[MSB (temp[2])]) << 8) \</span>00103 <span class="preprocessor"> ^ (word32) (S[MSB (temp[3])]) \</span>00104 <span class="preprocessor"> ^ roundkey[0]; \</span>00105 <span class="preprocessor"> text[1] = ((word32) (S[SSB (temp[0])]) << 24) \</span>00106 <span class="preprocessor"> ^ ((word32) (S[SSB (temp[1])]) << 16) \</span>00107 <span class="preprocessor"> ^ ((word32) (S[SSB (temp[2])]) << 8) \</span>00108 <span class="preprocessor"> ^ (word32) (S[SSB (temp[3])]) \</span>00109 <span class="preprocessor"> ^ roundkey[1]; \</span>00110 <span class="preprocessor"> text[2] = ((word32) (S[TSB (temp[0])]) << 24) \</span>00111 <span class="preprocessor"> ^ ((word32) (S[TSB (temp[1])]) << 16) \</span>00112 <span class="preprocessor"> ^ ((word32) (S[TSB (temp[2])]) << 8) \</span>00113 <span class="preprocessor"> ^ (word32) (S[TSB (temp[3])]) \</span>00114 <span class="preprocessor"> ^ roundkey[2]; \</span>00115 <span class="preprocessor"> text[3] = ((word32) (S[LSB (temp[0])]) << 24) \</span>00116 <span class="preprocessor"> ^ ((word32) (S[LSB (temp[1])]) << 16) \</span>00117 <span class="preprocessor"> ^ ((word32) (S[LSB (temp[2])]) << 8) \</span>00118 <span class="preprocessor"> ^ (word32) (S[LSB (temp[3])]) \</span>00119 <span class="preprocessor"> ^ roundkey[3]; \</span>00120 <span class="preprocessor">} </span><span class="comment">/* squareFinal */</span>00121 00122 <span class="keyword">typedef</span> BlockGetAndPut<word32, BigEndian> Block;00123 00124 <span class="keywordtype">void</span> Square::Enc::ProcessAndXorBlock(<span class="keyword">const</span> byte *inBlock, <span class="keyword">const</span> byte *xorBlock, byte *outBlock)<span class="keyword"> const</span>00125 <span class="keyword"></span>{00126 word32 text[4], temp[4];00127 Block::Get(inBlock)(text[0])(text[1])(text[2])(text[3]);00128 00129 <span class="comment">/* initial key addition */</span>00130 text[0] ^= roundkeys[0][0];00131 text[1] ^= roundkeys[0][1];00132 text[2] ^= roundkeys[0][2];00133 text[3] ^= roundkeys[0][3];00134 00135 <span class="comment">/* ROUNDS - 1 full rounds */</span>00136 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i=1; i+1<ROUNDS; i+=2)00137 {00138 squareRound (text, temp, Te[0], Te[1], Te[2], Te[3], roundkeys[i]);00139 squareRound (temp, text, Te[0], Te[1], Te[2], Te[3], roundkeys[i+1]);00140 }00141 squareRound (text, temp, Te[0], Te[1], Te[2], Te[3], roundkeys[ROUNDS-1]);00142 00143 <span class="comment">/* last round (diffusion becomes only transposition) */</span>00144 squareFinal (text, temp, Se, roundkeys[ROUNDS]);00145 00146 Block::Put(xorBlock, outBlock)(text[0])(text[1])(text[2])(text[3]);00147 }00148 00149 <span class="keywordtype">void</span> Square::Dec::ProcessAndXorBlock(<span class="keyword">const</span> byte *inBlock, <span class="keyword">const</span> byte *xorBlock, byte *outBlock)<span class="keyword"> const</span>00150 <span class="keyword"></span>{00151 word32 text[4], temp[4];00152 Block::Get(inBlock)(text[0])(text[1])(text[2])(text[3]);00153 00154 <span class="comment">/* initial key addition */</span>00155 text[0] ^= roundkeys[0][0];00156 text[1] ^= roundkeys[0][1];00157 text[2] ^= roundkeys[0][2];00158 text[3] ^= roundkeys[0][3];00159 00160 <span class="comment">/* ROUNDS - 1 full rounds */</span>00161 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i=1; i+1<ROUNDS; i+=2)00162 {00163 squareRound (text, temp, Td[0], Td[1], Td[2], Td[3], roundkeys[i]);00164 squareRound (temp, text, Td[0], Td[1], Td[2], Td[3], roundkeys[i+1]);00165 }00166 squareRound (text, temp, Td[0], Td[1], Td[2], Td[3], roundkeys[ROUNDS-1]);00167 00168 <span class="comment">/* last round (diffusion becomes only transposition) */</span>00169 squareFinal (text, temp, Sd, roundkeys[ROUNDS]);00170 00171 Block::Put(xorBlock, outBlock)(text[0])(text[1])(text[2])(text[3]);00172 }00173 00174 NAMESPACE_END</pre></div><hr size="1"><address style="align: right;"><small>Generated on Tue Jul 8 23:34:26 2003 for Crypto++ by<a href="http://www.doxygen.org/index.html"><img src="doxygen.png" alt="doxygen" align="middle" border=0 > </a>1.3.2 </small></address></body></html>⌨️ 快捷键说明
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