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76 lines
1.3 KiB
76 lines
1.3 KiB
#!/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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