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77 lines
1.3 KiB
77 lines
1.3 KiB
14 years ago
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#!/usr/local/bin/perl
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# x86 assember
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sub bn_sub_words
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{
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local($name)=@_;
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&function_begin($name,"");
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&comment("");
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$a="esi";
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$b="edi";
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$c="eax";
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$r="ebx";
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$tmp1="ecx";
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$tmp2="edx";
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$num="ebp";
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&mov($r,&wparam(0)); # get r
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&mov($a,&wparam(1)); # get a
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&mov($b,&wparam(2)); # get b
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&mov($num,&wparam(3)); # get num
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&xor($c,$c); # clear carry
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&and($num,0xfffffff8); # num / 8
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&jz(&label("aw_finish"));
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&set_label("aw_loop",0);
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for ($i=0; $i<8; $i++)
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{
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&comment("Round $i");
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&mov($tmp1,&DWP($i*4,$a,"",0)); # *a
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&mov($tmp2,&DWP($i*4,$b,"",0)); # *b
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&sub($tmp1,$c);
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&mov($c,0);
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&adc($c,$c);
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&sub($tmp1,$tmp2);
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&adc($c,0);
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&mov(&DWP($i*4,$r,"",0),$tmp1); # *r
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}
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&comment("");
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&add($a,32);
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&add($b,32);
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&add($r,32);
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&sub($num,8);
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&jnz(&label("aw_loop"));
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&set_label("aw_finish",0);
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&mov($num,&wparam(3)); # get num
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&and($num,7);
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&jz(&label("aw_end"));
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for ($i=0; $i<7; $i++)
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{
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&comment("Tail Round $i");
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&mov($tmp1,&DWP($i*4,$a,"",0)); # *a
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&mov($tmp2,&DWP($i*4,$b,"",0));# *b
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&sub($tmp1,$c);
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&mov($c,0);
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&adc($c,$c);
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&sub($tmp1,$tmp2);
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&adc($c,0);
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&dec($num) if ($i != 6);
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&mov(&DWP($i*4,$r,"",0),$tmp1); # *a
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&jz(&label("aw_end")) if ($i != 6);
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}
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&set_label("aw_end",0);
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# &mov("eax",$c); # $c is "eax"
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&function_end($name);
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}
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1;
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