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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++: rijndael.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>rijndael.cpp</h1><div class="fragment"><pre>00001 <span class="comment">// rijndael.cpp - modified by Chris Morgan <cmorgan@wpi.edu></span>00002 <span class="comment">// and Wei Dai from Paulo Baretto's Rijndael implementation</span>00003 <span class="comment">// The original code and all modifications are in the public domain.</span>00004 00005 <span class="comment">// This is the original introductory comment:</span>00006 <span class="comment"></span>00007 <span class="comment">/**</span>00008 <span class="comment"> * version 3.0 (December 2000)</span>00009 <span class="comment"> *</span>00010 <span class="comment"> * Optimised ANSI C code for the Rijndael cipher (now AES)</span>00011 <span class="comment"> *</span>00012 <span class="comment"> * author Vincent Rijmen <vincent.rijmen@esat.kuleuven.ac.be></span>00013 <span class="comment"> * author Antoon Bosselaers <antoon.bosselaers@esat.kuleuven.ac.be></span>00014 <span class="comment"> * author Paulo Barreto <paulo.barreto@terra.com.br></span>00015 <span class="comment"> *</span>00016 <span class="comment"> * This code is hereby placed in the public domain.</span>00017 <span class="comment"> *</span>00018 <span class="comment"> * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ''AS IS'' AND ANY EXPRESS</span>00019 <span class="comment"> * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED</span>00020 <span class="comment"> * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE</span>00021 <span class="comment"> * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE</span>00022 <span class="comment"> * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR</span>00023 <span class="comment"> * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF</span>00024 <span class="comment"> * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR</span>00025 <span class="comment"> * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,</span>00026 <span class="comment"> * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE</span>00027 <span class="comment"> * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,</span>00028 <span class="comment"> * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span>00029 <span class="comment"> */</span>00030 00031 <span class="preprocessor">#include "pch.h"</span>00032 00033 <span class="preprocessor">#ifndef CRYPTOPP_IMPORTS</span>00034 <span class="preprocessor"></span>00035 <span class="preprocessor">#include "<a class="code" href="rijndael_8h.html">rijndael.h</a>"</span>00036 <span class="preprocessor">#include "misc.h"</span>00037 00038 NAMESPACE_BEGIN(CryptoPP)00039 00040 <span class="keywordtype">void</span> Rijndael::Base::UncheckedSetKey(CipherDir dir, <span class="keyword">const</span> byte *userKey, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> keylen)00041 {00042 AssertValidKeyLength(keylen);00043 00044 m_rounds = keylen/4 + 6;00045 m_key.New(4*(m_rounds+1));00046 00047 word32 temp, *rk = m_key;00048 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=0;00049 00050 GetUserKey(BIG_ENDIAN_ORDER, rk, keylen/4, userKey, keylen);00051 00052 <span class="keywordflow">switch</span>(keylen)00053 {00054 <span class="keywordflow">case</span> 16:00055 <span class="keywordflow">while</span> (<span class="keyword">true</span>)00056 {00057 temp = rk[3];00058 rk[4] = rk[0] ^00059 (Te4[GETBYTE(temp, 2)] & 0xff000000) ^00060 (Te4[GETBYTE(temp, 1)] & 0x00ff0000) ^00061 (Te4[GETBYTE(temp, 0)] & 0x0000ff00) ^00062 (Te4[GETBYTE(temp, 3)] & 0x000000ff) ^00063 rcon[i];00064 rk[5] = rk[1] ^ rk[4];00065 rk[6] = rk[2] ^ rk[5];00066 rk[7] = rk[3] ^ rk[6];00067 <span class="keywordflow">if</span> (++i == 10)00068 <span class="keywordflow">break</span>;00069 rk += 4;00070 }00071 <span class="keywordflow">break</span>;00072 00073 <span class="keywordflow">case</span> 24:00074 <span class="keywordflow">while</span> (<span class="keyword">true</span>) <span class="comment">// for (;;) here triggers a bug in VC60 SP4 w/ Processor Pack</span>00075 {00076 temp = rk[ 5];00077 rk[ 6] = rk[ 0] ^00078 (Te4[GETBYTE(temp, 2)] & 0xff000000) ^00079 (Te4[GETBYTE(temp, 1)] & 0x00ff0000) ^00080 (Te4[GETBYTE(temp, 0)] & 0x0000ff00) ^00081 (Te4[GETBYTE(temp, 3)] & 0x000000ff) ^00082 rcon[i];00083 rk[ 7] = rk[ 1] ^ rk[ 6];00084 rk[ 8] = rk[ 2] ^ rk[ 7];00085 rk[ 9] = rk[ 3] ^ rk[ 8];00086 <span class="keywordflow">if</span> (++i == 8)00087 <span class="keywordflow">break</span>;00088 rk[10] = rk[ 4] ^ rk[ 9];00089 rk[11] = rk[ 5] ^ rk[10];00090 rk += 6;00091 }00092 <span class="keywordflow">break</span>;00093 00094 <span class="keywordflow">case</span> 32:00095 <span class="keywordflow">while</span> (<span class="keyword">true</span>)00096 {00097 temp = rk[ 7];00098 rk[ 8] = rk[ 0] ^00099 (Te4[GETBYTE(temp, 2)] & 0xff000000) ^00100 (Te4[GETBYTE(temp, 1)] & 0x00ff0000) ^00101 (Te4[GETBYTE(temp, 0)] & 0x0000ff00) ^00102 (Te4[GETBYTE(temp, 3)] & 0x000000ff) ^00103 rcon[i];00104 rk[ 9] = rk[ 1] ^ rk[ 8];00105 rk[10] = rk[ 2] ^ rk[ 9];00106 rk[11] = rk[ 3] ^ rk[10];00107 <span class="keywordflow">if</span> (++i == 7)00108 <span class="keywordflow">break</span>;00109 temp = rk[11];00110 rk[12] = rk[ 4] ^00111 (Te4[GETBYTE(temp, 3)] & 0xff000000) ^00112 (Te4[GETBYTE(temp, 2)] & 0x00ff0000) ^00113 (Te4[GETBYTE(temp, 1)] & 0x0000ff00) ^00114 (Te4[GETBYTE(temp, 0)] & 0x000000ff);00115 rk[13] = rk[ 5] ^ rk[12];00116 rk[14] = rk[ 6] ^ rk[13];00117 rk[15] = rk[ 7] ^ rk[14];00118 00119 rk += 8;00120 }00121 <span class="keywordflow">break</span>;00122 }00123 00124 <span class="keywordflow">if</span> (dir == DECRYPTION)00125 {00126 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i, j;00127 rk = m_key;00128 00129 <span class="comment">/* invert the order of the round keys: */</span>00130 <span class="keywordflow">for</span> (i = 0, j = 4*m_rounds; i < j; i += 4, j -= 4) {00131 temp = rk[i ]; rk[i ] = rk[j ]; rk[j ] = temp;00132 temp = rk[i + 1]; rk[i + 1] = rk[j + 1]; rk[j + 1] = temp;00133 temp = rk[i + 2]; rk[i + 2] = rk[j + 2]; rk[j + 2] = temp;00134 temp = rk[i + 3]; rk[i + 3] = rk[j + 3]; rk[j + 3] = temp;00135 }00136 <span class="comment">/* apply the inverse MixColumn transform to all round keys but the first and the last: */</span>00137 <span class="keywordflow">for</span> (i = 1; i < m_rounds; i++) {00138 rk += 4;00139 rk[0] =00140 Td0[Te4[GETBYTE(rk[0], 3)] & 0xff] ^00141 Td1[Te4[GETBYTE(rk[0], 2)] & 0xff] ^00142 Td2[Te4[GETBYTE(rk[0], 1)] & 0xff] ^00143 Td3[Te4[GETBYTE(rk[0], 0)] & 0xff];00144 rk[1] =00145 Td0[Te4[GETBYTE(rk[1], 3)] & 0xff] ^00146 Td1[Te4[GETBYTE(rk[1], 2)] & 0xff] ^00147 Td2[Te4[GETBYTE(rk[1], 1)] & 0xff] ^00148 Td3[Te4[GETBYTE(rk[1], 0)] & 0xff];00149 rk[2] =00150 Td0[Te4[GETBYTE(rk[2], 3)] & 0xff] ^00151 Td1[Te4[GETBYTE(rk[2], 2)] & 0xff] ^00152 Td2[Te4[GETBYTE(rk[2], 1)] & 0xff] ^00153 Td3[Te4[GETBYTE(rk[2], 0)] & 0xff];00154 rk[3] =00155 Td0[Te4[GETBYTE(rk[3], 3)] & 0xff] ^00156 Td1[Te4[GETBYTE(rk[3], 2)] & 0xff] ^00157 Td2[Te4[GETBYTE(rk[3], 1)] & 0xff] ^00158 Td3[Te4[GETBYTE(rk[3], 0)] & 0xff];00159 }00160 }00161 }00162 00163 <span class="keyword">typedef</span> BlockGetAndPut<word32, BigEndian> Block;00164 00165 <span class="keywordtype">void</span> Rijndael::Enc::ProcessAndXorBlock(<span class="keyword">const</span> byte *inBlock, <span class="keyword">const</span> byte *xorBlock, byte *outBlock)<span class="keyword"> const</span>00166 <span class="keyword"></span>{00167 word32 s0, s1, s2, s3, t0, t1, t2, t3;00168 <span class="keyword">const</span> word32 *rk = m_key;00169 00170 <span class="comment">/*</span>00171 <span class="comment"> * map byte array block to cipher state</span>00172 <span class="comment"> * and add initial round key:</span>00173 <span class="comment"> */</span>00174 Block::Get(inBlock)(s0)(s1)(s2)(s3);00175 s0 ^= rk[0];00176 s1 ^= rk[1];00177 s2 ^= rk[2];00178 s3 ^= rk[3];00179 <span class="comment">/*</span>00180 <span class="comment"> * Nr - 1 full rounds:</span>00181 <span class="comment"> */</span>00182 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> r = m_rounds >> 1;00183 <span class="keywordflow">for</span> (;;) {00184 t0 =00185 Te0[GETBYTE(s0, 3)] ^00186 Te1[GETBYTE(s1, 2)] ^00187 Te2[GETBYTE(s2, 1)] ^00188 Te3[GETBYTE(s3, 0)] ^00189 rk[4];00190 t1 =⌨️ 快捷键说明
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