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著名的密码库Crypto++的文档 C++语言的杰作。程序员必备。

<a name="l00403"></a>00403                 AS2(    cmp             WORD_REG(si), 80)
<a name="l00404"></a>00404                 AS2(    cmovg   WORD_REG(si), WORD_REG(ax))
<a name="l00405"></a>00405                 AS2(    mov             SSE2_wordsLeft2, WORD_REG(si))
<a name="l00406"></a>00406                 AS2(    lea             WORD_REG(si), [WORD_REG(di)+WORD_REG(si)])              <span class="comment">// use to end first inner loop</span>
<a name="l00407"></a>00407                 AS2(    mov             SSE2_diEnd, WORD_REG(si))
<a name="l00408"></a>00408 <span class="preprocessor">#ifdef _MSC_VER</span>
<a name="l00409"></a>00409 <span class="preprocessor"></span>                AS2(    lea             WORD_REG(si), s_mulTables)
<a name="l00410"></a>00410 <span class="preprocessor">#else</span>
<a name="l00411"></a>00411 <span class="preprocessor"></span>                AS2(    mov             WORD_REG(si), SSE2_pMulTables)
<a name="l00412"></a>00412 <span class="preprocessor">#endif</span>
<a name="l00413"></a>00413 <span class="preprocessor"></span>
<a name="l00414"></a>00414                 ASL(0)  <span class="comment">// first inner loop, 20 words each, 4 iterations</span>
<a name="l00415"></a>00415                 SSE2_STEP(0, 0)
<a name="l00416"></a>00416                 SSE2_STEP(1, 1)
<a name="l00417"></a>00417                 SSE2_STEP(2, 0)
<a name="l00418"></a>00418                 SSE2_STEP(3, 1)
<a name="l00419"></a>00419                 SSE2_STEP(4, 0)
<a name="l00420"></a>00420                 SSE2_STEP(5, 1)
<a name="l00421"></a>00421                 SSE2_STEP(6, 0)
<a name="l00422"></a>00422                 SSE2_STEP(7, 1)
<a name="l00423"></a>00423                 SSE2_STEP(8, 0)
<a name="l00424"></a>00424                 SSE2_STEP(9, 1)
<a name="l00425"></a>00425                 SSE2_STEP(10, 0)
<a name="l00426"></a>00426                 SSE2_STEP(11, 1)
<a name="l00427"></a>00427                 SSE2_STEP(12, 0)
<a name="l00428"></a>00428                 SSE2_STEP(13, 1)
<a name="l00429"></a>00429                 SSE2_STEP(14, 0)
<a name="l00430"></a>00430                 SSE2_STEP(15, 1)
<a name="l00431"></a>00431                 SSE2_STEP(16, 0)
<a name="l00432"></a>00432                 SSE2_STEP(17, 1)
<a name="l00433"></a>00433                 SSE2_STEP(18, 0)
<a name="l00434"></a>00434                 SSE2_STEP(19, 1)
<a name="l00435"></a>00435                 <span class="comment">// loop</span>
<a name="l00436"></a>00436                 AS2(    <span class="keyword">add</span>             WORD_REG(di), 5*4)
<a name="l00437"></a>00437                 AS2(    cmp             WORD_REG(di), SSE2_diEnd)
<a name="l00438"></a>00438                 ASJ(    jne,    0, b)
<a name="l00439"></a>00439 
<a name="l00440"></a>00440                 AS2(    mov             WORD_REG(ax), SSE2_input)
<a name="l00441"></a>00441                 AS2(    mov             WORD_REG(bp), SSE2_output)
<a name="l00442"></a>00442                 AS2(    lea             WORD_REG(di), [SSE2_uvStart])           <span class="comment">// start of v and u</span>
<a name="l00443"></a>00443                 AS2(    mov             WORD_REG(si), SSE2_wordsLeft2)
<a name="l00444"></a>00444 
<a name="l00445"></a>00445                 ASL(1)  <span class="comment">// second inner loop, 16 words each, 5 iterations</span>
<a name="l00446"></a>00446                 AS2(    movdqa  xmm0, [WORD_REG(di)+0*20*4])
<a name="l00447"></a>00447                 AS2(    movdqa  xmm2, [WORD_REG(di)+2*20*4])
<a name="l00448"></a>00448                 AS2(    movdqa  xmm3, [WORD_REG(di)+3*20*4])
<a name="l00449"></a>00449                 AS2(    movdqa  xmm1, [WORD_REG(di)+1*20*4])
<a name="l00450"></a>00450                 <span class="comment">// S2</span>
<a name="l00451"></a>00451                 AS2(    movdqa  xmm4, xmm0)
<a name="l00452"></a>00452                 AS2(    pand    xmm0, xmm2)
<a name="l00453"></a>00453                 AS2(    pxor    xmm0, xmm3)
<a name="l00454"></a>00454                 AS2(    pxor    xmm2, xmm1)
<a name="l00455"></a>00455                 AS2(    pxor    xmm2, xmm0)
<a name="l00456"></a>00456                 AS2(    por             xmm3, xmm4)
<a name="l00457"></a>00457                 AS2(    pxor    xmm3, xmm1)
<a name="l00458"></a>00458                 AS2(    pxor    xmm4, xmm2)
<a name="l00459"></a>00459                 AS2(    movdqa  xmm1, xmm3)
<a name="l00460"></a>00460                 AS2(    por             xmm3, xmm4)
<a name="l00461"></a>00461                 AS2(    pxor    xmm3, xmm0)
<a name="l00462"></a>00462                 AS2(    pand    xmm0, xmm1)
<a name="l00463"></a>00463                 AS2(    pxor    xmm4, xmm0)
<a name="l00464"></a>00464                 AS2(    pxor    xmm1, xmm3)
<a name="l00465"></a>00465                 AS2(    pxor    xmm1, xmm4)
<a name="l00466"></a>00466                 AS2(    pxor    xmm4, xmm7)
<a name="l00467"></a>00467                 <span class="comment">// xor with v</span>
<a name="l00468"></a>00468                 AS2(    pxor    xmm2, [WORD_REG(di)+80*4])
<a name="l00469"></a>00469                 AS2(    pxor    xmm3, [WORD_REG(di)+80*5])
<a name="l00470"></a>00470                 AS2(    pxor    xmm1, [WORD_REG(di)+80*6])
<a name="l00471"></a>00471                 AS2(    pxor    xmm4, [WORD_REG(di)+80*7])
<a name="l00472"></a>00472                 <span class="comment">// exit loop early if less than 16 words left to output</span>
<a name="l00473"></a>00473                 <span class="comment">// this is necessary because block size is 20 words, and we output 16 words in each iteration of this loop</span>
<a name="l00474"></a>00474                 AS2(    cmp             WORD_REG(si), 16)
<a name="l00475"></a>00475                 ASJ(    jl,             4, f)
<a name="l00476"></a>00476                 <span class="comment">// unpack</span>
<a name="l00477"></a>00477                 AS2(    movdqa          xmm6, xmm2)
<a name="l00478"></a>00478                 AS2(    punpckldq       xmm2, xmm3)
<a name="l00479"></a>00479                 AS2(    movdqa          xmm5, xmm1)
<a name="l00480"></a>00480                 AS2(    punpckldq       xmm1, xmm4)
<a name="l00481"></a>00481                 AS2(    movdqa          xmm0, xmm2)
<a name="l00482"></a>00482                 AS2(    punpcklqdq      xmm2, xmm1)
<a name="l00483"></a>00483                 AS2(    punpckhqdq      xmm0, xmm1)
<a name="l00484"></a>00484                 AS2(    punpckhdq       xmm6, xmm3)
<a name="l00485"></a>00485                 AS2(    punpckhdq       xmm5, xmm4)
<a name="l00486"></a>00486                 AS2(    movdqa          xmm3, xmm6)
<a name="l00487"></a>00487                 AS2(    punpcklqdq      xmm6, xmm5)
<a name="l00488"></a>00488                 AS2(    punpckhqdq      xmm3, xmm5)
<a name="l00489"></a>00489                 <span class="comment">// output keystream</span>
<a name="l00490"></a>00490                 AS2(    test    WORD_REG(ax), WORD_REG(ax))
<a name="l00491"></a>00491                 ASJ(    jz,             3, f)
<a name="l00492"></a>00492                 AS2(    test    eax, 0xf)
<a name="l00493"></a>00493                 ASJ(    jnz,    7, f)
<a name="l00494"></a>00494                 AS2(    pxor    xmm2, [WORD_REG(ax)+0*16])
<a name="l00495"></a>00495                 AS2(    pxor    xmm0, [WORD_REG(ax)+1*16])
<a name="l00496"></a>00496                 AS2(    pxor    xmm6, [WORD_REG(ax)+2*16])
<a name="l00497"></a>00497                 AS2(    pxor    xmm3, [WORD_REG(ax)+3*16])
<a name="l00498"></a>00498                 AS2(    <span class="keyword">add</span>             WORD_REG(ax), 4*16)
<a name="l00499"></a>00499                 ASJ(    jmp,    3, f)
<a name="l00500"></a>00500                 ASL(7)
<a name="l00501"></a>00501                 AS2(    movdqu  xmm1, [WORD_REG(ax)+0*16])
<a name="l00502"></a>00502                 AS2(    pxor    xmm2, xmm1)
<a name="l00503"></a>00503                 AS2(    movdqu  xmm1, [WORD_REG(ax)+1*16])
<a name="l00504"></a>00504                 AS2(    pxor    xmm0, xmm1)
<a name="l00505"></a>00505                 AS2(    movdqu  xmm1, [WORD_REG(ax)+2*16])
<a name="l00506"></a>00506                 AS2(    pxor    xmm6, xmm1)
<a name="l00507"></a>00507                 AS2(    movdqu  xmm1, [WORD_REG(ax)+3*16])
<a name="l00508"></a>00508                 AS2(    pxor    xmm3, xmm1)
<a name="l00509"></a>00509                 AS2(    <span class="keyword">add</span>             WORD_REG(ax), 4*16)
<a name="l00510"></a>00510                 ASL(3)
<a name="l00511"></a>00511                 AS2(    test    ebp, 0xf)
<a name="l00512"></a>00512                 ASJ(    jnz,    8, f)
<a name="l00513"></a>00513                 AS2(    movdqa  [WORD_REG(bp)+0*16], xmm2)
<a name="l00514"></a>00514                 AS2(    movdqa  [WORD_REG(bp)+1*16], xmm0)
<a name="l00515"></a>00515                 AS2(    movdqa  [WORD_REG(bp)+2*16], xmm6)
<a name="l00516"></a>00516                 AS2(    movdqa  [WORD_REG(bp)+3*16], xmm3)
<a name="l00517"></a>00517                 ASJ(    jmp,    9, f)
<a name="l00518"></a>00518                 ASL(8)
<a name="l00519"></a>00519                 AS2(    movdqu  [WORD_REG(bp)+0*16], xmm2)
<a name="l00520"></a>00520                 AS2(    movdqu  [WORD_REG(bp)+1*16], xmm0)
<a name="l00521"></a>00521                 AS2(    movdqu  [WORD_REG(bp)+2*16], xmm6)
<a name="l00522"></a>00522                 AS2(    movdqu  [WORD_REG(bp)+3*16], xmm3)
<a name="l00523"></a>00523                 ASL(9)
<a name="l00524"></a>00524                 <span class="comment">// loop</span>
<a name="l00525"></a>00525                 AS2(    <span class="keyword">add</span>             WORD_REG(di), 4*4)
<a name="l00526"></a>00526                 AS2(    <span class="keyword">add</span>             WORD_REG(bp), 4*16)
<a name="l00527"></a>00527                 AS2(    sub             WORD_REG(si), 16)
<a name="l00528"></a>00528                 ASJ(    jnz,    1, b)
<a name="l00529"></a>00529 
<a name="l00530"></a>00530                 <span class="comment">// outer loop</span>
<a name="l00531"></a>00531                 AS2(    mov             WORD_REG(si), SSE2_wordsLeft)
<a name="l00532"></a>00532                 AS2(    sub             WORD_REG(si), 80)
<a name="l00533"></a>00533                 ASJ(    jz,             6, f)
<a name="l00534"></a>00534                 AS2(    mov             SSE2_wordsLeft, WORD_REG(si))
<a name="l00535"></a>00535                 AS2(    mov             SSE2_input, WORD_REG(ax))
<a name="l00536"></a>00536                 AS2(    mov             SSE2_output, WORD_REG(bp))
<a name="l00537"></a>00537                 ASJ(    jmp,    2, b)
<a name="l00538"></a>00538 
<a name="l00539"></a>00539                 ASL(4)  <span class="comment">// final output of less than 16 words</span>
<a name="l00540"></a>00540                 AS2(    test    WORD_REG(ax), WORD_REG(ax))
<a name="l00541"></a>00541                 ASJ(    jz,             5, f)
<a name="l00542"></a>00542                 AS2(    movd    xmm0, [WORD_REG(ax)+0*4])
<a name="l00543"></a>00543                 AS2(    pxor    xmm2, xmm0)