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<a name="l00508"></a>00508 <a name="l00509"></a>00509 t0 = rk[4]; t1 = rk[5]; t2 = rk[6]; t3 = rk[7];<a name="l00510"></a>00510 <a name="l00511"></a>00511 QUARTER_ROUND(s3, t0, t1, t2, t3)<a name="l00512"></a>00512 QUARTER_ROUND(s2, t3, t0, t1, t2)<a name="l00513"></a>00513 QUARTER_ROUND(s1, t2, t3, t0, t1)<a name="l00514"></a>00514 QUARTER_ROUND(s0, t1, t2, t3, t0)<a name="l00515"></a>00515 <span class="preprocessor">#undef QUARTER_ROUND</span><a name="l00516"></a>00516 <span class="preprocessor"></span><a name="l00517"></a>00517 rk += 8;<a name="l00518"></a>00518 } <span class="keywordflow">while</span> (--r);<a name="l00519"></a>00519 <a name="l00520"></a>00520 <span class="comment">// timing attack countermeasure. see comments at top for more details</span><a name="l00521"></a>00521 u = 0;<a name="l00522"></a>00522 <span class="keywordflow">for</span> (i=0; i<256; i+=cacheLineSize)<a name="l00523"></a>00523 u &= *(<span class="keyword">const</span> word32 *)(Se+i);<a name="l00524"></a>00524 u &= *(<span class="keyword">const</span> word32 *)(Se+252);<a name="l00525"></a>00525 t0 |= u; t1 |= u; t2 |= u; t3 |= u;<a name="l00526"></a>00526 <a name="l00527"></a>00527 word32 tbw[4];<a name="l00528"></a>00528 byte *<span class="keyword">const</span> tempBlock = (byte *)tbw;<a name="l00529"></a>00529 word32 *<span class="keyword">const</span> obw = (word32 *)outBlock;<a name="l00530"></a>00530 <span class="keyword">const</span> word32 *<span class="keyword">const</span> xbw = (<span class="keyword">const</span> word32 *)xorBlock;<a name="l00531"></a>00531 <a name="l00532"></a>00532 <span class="preprocessor">#define QUARTER_ROUND(t, a, b, c, d) \</span><a name="l00533"></a>00533 <span class="preprocessor"> tempBlock[a] = Se[byte(t)]; t >>= 8;\</span><a name="l00534"></a>00534 <span class="preprocessor"> tempBlock[b] = Se[byte(t)]; t >>= 8;\</span><a name="l00535"></a>00535 <span class="preprocessor"> tempBlock[c] = Se[byte(t)]; t >>= 8;\</span><a name="l00536"></a>00536 <span class="preprocessor"> tempBlock[d] = Se[t];</span><a name="l00537"></a>00537 <span class="preprocessor"></span><a name="l00538"></a>00538 QUARTER_ROUND(t2, 15, 2, 5, 8)<a name="l00539"></a>00539 QUARTER_ROUND(t1, 11, 14, 1, 4)<a name="l00540"></a>00540 QUARTER_ROUND(t0, 7, 10, 13, 0)<a name="l00541"></a>00541 QUARTER_ROUND(t3, 3, 6, 9, 12)<a name="l00542"></a>00542 <span class="preprocessor">#undef QUARTER_ROUND</span><a name="l00543"></a>00543 <span class="preprocessor"></span><a name="l00544"></a>00544 <span class="keywordflow">if</span> (xbw)<a name="l00545"></a>00545 {<a name="l00546"></a>00546 obw[0] = tbw[0] ^ xbw[0] ^ rk[0];<a name="l00547"></a>00547 obw[1] = tbw[1] ^ xbw[1] ^ rk[1];<a name="l00548"></a>00548 obw[2] = tbw[2] ^ xbw[2] ^ rk[2];<a name="l00549"></a>00549 obw[3] = tbw[3] ^ xbw[3] ^ rk[3];<a name="l00550"></a>00550 }<a name="l00551"></a>00551 <span class="keywordflow">else</span><a name="l00552"></a>00552 {<a name="l00553"></a>00553 obw[0] = tbw[0] ^ rk[0];<a name="l00554"></a>00554 obw[1] = tbw[1] ^ rk[1];<a name="l00555"></a>00555 obw[2] = tbw[2] ^ rk[2];<a name="l00556"></a>00556 obw[3] = tbw[3] ^ rk[3];<a name="l00557"></a>00557 }<a name="l00558"></a>00558 }<a name="l00559"></a>00559 }<a name="l00560"></a>00560 <a name="l00561"></a>00561 <span class="keywordtype">void</span> Rijndael::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="l00562"></a>00562 <span class="keyword"></span>{<a name="l00563"></a>00563 word32 s0, s1, s2, s3, t0, t1, t2, t3;<a name="l00564"></a>00564 <span class="keyword">const</span> word32 *rk = m_key;<a name="l00565"></a>00565 <a name="l00566"></a>00566 s0 = ((<span class="keyword">const</span> word32 *)inBlock)[0] ^ rk[0];<a name="l00567"></a>00567 s1 = ((<span class="keyword">const</span> word32 *)inBlock)[1] ^ rk[1];<a name="l00568"></a>00568 s2 = ((<span class="keyword">const</span> word32 *)inBlock)[2] ^ rk[2];<a name="l00569"></a>00569 s3 = ((<span class="keyword">const</span> word32 *)inBlock)[3] ^ rk[3];<a name="l00570"></a>00570 t0 = rk[4];<a name="l00571"></a>00571 t1 = rk[5];<a name="l00572"></a>00572 t2 = rk[6];<a name="l00573"></a>00573 t3 = rk[7];<a name="l00574"></a>00574 rk += 8;<a name="l00575"></a>00575 <a name="l00576"></a>00576 <span class="comment">// timing attack countermeasure. see comments at top for more details</span><a name="l00577"></a>00577 <span class="keyword">const</span> <span class="keywordtype">int</span> cacheLineSize = GetCacheLineSize();<a name="l00578"></a>00578 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i;<a name="l00579"></a>00579 word32 u = 0;<a name="l00580"></a>00580 <span class="keywordflow">for</span> (i=0; i<1024; i+=cacheLineSize)<a name="l00581"></a>00581 u &= *(<span class="keyword">const</span> word32 *)(((<span class="keyword">const</span> byte *)Td)+i);<a name="l00582"></a>00582 u &= Td[255];<a name="l00583"></a>00583 s0 |= u; s1 |= u; s2 |= u; s3 |= u;<a name="l00584"></a>00584 <a name="l00585"></a>00585 <span class="comment">// first round</span><a name="l00586"></a>00586 <span class="preprocessor">#ifdef IS_BIG_ENDIAN</span><a name="l00587"></a>00587 <span class="preprocessor"></span><span class="preprocessor">#define QUARTER_ROUND(t, a, b, c, d) \</span><a name="l00588"></a>00588 <span class="preprocessor"> a ^= rotrFixed(Td[byte(t)], 24); t >>= 8;\</span><a name="l00589"></a>00589 <span class="preprocessor"> b ^= rotrFixed(Td[byte(t)], 16); t >>= 8;\</span><a name="l00590"></a>00590 <span class="preprocessor"> c ^= rotrFixed(Td[byte(t)], 8); t >>= 8;\</span><a name="l00591"></a>00591 <span class="preprocessor"> d ^= Td[t];</span><a name="l00592"></a>00592 <span class="preprocessor"></span><span class="preprocessor">#else</span><a name="l00593"></a>00593 <span class="preprocessor"></span><span class="preprocessor">#define QUARTER_ROUND(t, a, b, c, d) \</span><a name="l00594"></a>00594 <span class="preprocessor"> d ^= Td[byte(t)]; t >>= 8;\</span><a name="l00595"></a>00595 <span class="preprocessor"> c ^= rotrFixed(Td[byte(t)], 8); t >>= 8;\</span><a name="l00596"></a>00596 <span class="preprocessor"> b ^= rotrFixed(Td[byte(t)], 16); t >>= 8;\</span><a name="l00597"></a>00597 <span class="preprocessor"> a ^= rotrFixed(Td[t], 24);</span><a name="l00598"></a>00598 <span class="preprocessor"></span><span class="preprocessor">#endif</span><a name="l00599"></a>00599 <span class="preprocessor"></span><a name="l00600"></a>00600 QUARTER_ROUND(s3, t2, t1, t0, t3)<a name="l00601"></a>00601 QUARTER_ROUND(s2, t1, t0, t3, t2)<a name="l00602"></a>00602 QUARTER_ROUND(s1, t0, t3, t2, t1)<a name="l00603"></a>00603 QUARTER_ROUND(s0, t3, t2, t1, t0)<a name="l00604"></a>00604 <span class="preprocessor">#undef QUARTER_ROUND</span><a name="l00605"></a>00605 <span class="preprocessor"></span><a name="l00606"></a>00606 <span class="comment">// Nr - 2 full rounds:</span><a name="l00607"></a>00607 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> r = m_rounds/2 - 1;<a name="l00608"></a>00608 <span class="keywordflow">do</span><a name="l00609"></a>00609 {<a name="l00610"></a>00610 <span class="preprocessor">#define QUARTER_ROUND(t, a, b, c, d) \</span><a name="l00611"></a>00611 <span class="preprocessor"> a ^= Td[3*256+byte(t)]; t >>= 8;\</span><a name="l00612"></a>00612 <span class="preprocessor"> b ^= Td[2*256+byte(t)]; t >>= 8;\</span><a name="l00613"></a>00613 <span class="preprocessor"> c ^= Td[1*256+byte(t)]; t >>= 8;\</span><a name="l00614"></a>00614 <span class="preprocessor"> d ^= Td[t];</span><a name="l00615"></a>00615 <span class="preprocessor"></span><a name="l00616"></a>00616 s0 = rk[0]; s1 = rk[1]; s2 = rk[2]; s3 = rk[3];<a name="l00617"></a>00617 <a name="l00618"></a>00618 QUARTER_ROUND(t3, s2, s1, s0, s3)<a name="l00619"></a>00619 QUARTER_ROUND(t2, s1, s0, s3, s2)<a name="l00620"></a>00620 QUARTER_ROUND(t1, s0, s3, s2, s1)<a name="l00621"></a>00621 QUARTER_ROUND(t0, s3, s2, s1, s0)<a name="l00622"></a>00622 <a name="l00623"></a>00623 t0 = rk[4]; t1 = rk[5]; t2 = rk[6]; t3 = rk[7];<a name="l00624"></a>00624 <a name="l00625"></a>00625 QUARTER_ROUND(s3, t2, t1, t0, t3)<a name="l00626"></a>00626 QUARTER_ROUND(s2, t1, t0, t3, t2)<a name="l00627"></a>00627 QUARTER_ROUND(s1, t0, t3, t2, t1)<a name="l00628"></a>00628 QUARTER_ROUND(s0, t3, t2, t1, t0)<a name="l00629"></a>00629 <span class="preprocessor">#undef QUARTER_ROUND</span><a name="l00630"></a>00630 <span class="preprocessor"></span><a name="l00631"></a>00631 rk += 8;<a name="l00632"></a>00632 } <span class="keywordflow">while</span> (--r);<a name="l00633"></a>00633 <a name="l00634"></a>00634 <span class="comment">// timing attack countermeasure. see comments at top for more details</span><a name="l00635"></a>00635 u = 0;<a name="l00636"></a>00636 <span class="keywordflow">for</span> (i=0; i<256; i+=cacheLineSize)<a name="l00637"></a>00637 u &= *(<span class="keyword">const</span> word32 *)(Sd+i);<a name="l00638"></a>00638 u &= *(<span class="keyword">const</span> word32 *)(Sd+252);<a name="l00639"></a>00639 t0 |= u; t1 |= u; t2 |= u; t3 |= u;<a name="l00640"></a>00640 <a name="l00641"></a>00641 word32 tbw[4];<a name="l00642"></a>00642 byte *<span class="keyword">const</span> tempBlock = (byte *)tbw;<a name="l00643"></a>00643 word32 *<span class="keyword">const</span> obw = (word32 *)outBlock;<a name="l00644"></a>00644 <span class="keyword">const</span> word32 *<span class="keyword">const</span> xbw = (<span class="keyword">const</span> word32 *)xorBlock;<a name="l00645"></a>00645 <a name="l00646"></a>00646 <span class="preprocessor">#define QUARTER_ROUND(t, a, b, c, d) \</span><a name="l00647"></a>00647 <span class="preprocessor"> tempBlock[a] = Sd[byte(t)]; t >>= 8;\</span><a name="l00648"></a>00648 <span class="preprocessor"> tempBlock[b] = Sd[byte(t)]; t >>= 8;\</span><a name="l00649"></a>00649 <span class="preprocessor"> tempBlock[c] = Sd[byte(t)]; t >>= 8;\</span><a name="l00650"></a>00650 <span class="preprocessor"> tempBlock[d] = Sd[t];</span><a name="l00651"></a>00651 <span class="preprocessor"></span><a name="l00652"></a>00652 QUARTER_ROUND(t2, 7, 2, 13, 8)<a name="l00653"></a>00653 QUARTER_ROUND(t1, 3, 14, 9, 4)<a name="l00654"></a>00654 QUARTER_ROUND(t0, 15, 10, 5, 0)<a name="l00655"></a>00655 QUARTER_ROUND(t3, 11, 6, 1, 12)<a name="l00656"></a>00656 <span class="preprocessor">#undef QUARTER_ROUND</span><a name="l00657"></a>00657 <span class="preprocessor"></span><a name="l00658"></a>00658 <span class="keywordflow">if</span> (xbw)<a name="l00659"></a>00659 {<a name="l00660"></a>00660 obw[0] = tbw[0] ^ xbw[0] ^ rk[0];<a name="l00661"></a>00661 obw[1] = tbw[1] ^ xbw[1] ^ rk[1];<a name="l00662"></a>00662 obw[2] = tbw[2] ^ xbw[2] ^ rk[2];<a name="l00663"></a>00663 obw[3] = tbw[3] ^ xbw[3] ^ rk[3];<a name="l00664"></a>00664 }<a name="l00665"></a>00665 <span class="keywordflow">else</span><a name="l00666"></a>00666 {<a name="l00667"></a>00667 obw[0] = tbw[0] ^ rk[0];<a name="l00668"></a>00668 obw[1] = tbw[1] ^ rk[1];<a name="l00669"></a>00669 obw[2] = tbw[2] ^ rk[2];<a name="l00670"></a>00670 obw[3] = tbw[3] ^ rk[3];<a name="l00671"></a>00671 }<a name="l00672"></a>00672 }<a name="l00673"></a>00673 <a name="l00674"></a>00674 NAMESPACE_END<a name="l00675"></a>00675 <a name="l00676"></a>00676 <span class="preprocessor">#endif</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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