Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 1 | #!/usr/local/bin/perl |
| 2 | # x86 assember |
| 3 | |
| 4 | sub bn_sub_words |
| 5 | { |
| 6 | local($name)=@_; |
| 7 | |
| 8 | &function_begin($name,""); |
| 9 | |
| 10 | &comment(""); |
| 11 | $a="esi"; |
| 12 | $b="edi"; |
| 13 | $c="eax"; |
| 14 | $r="ebx"; |
| 15 | $tmp1="ecx"; |
| 16 | $tmp2="edx"; |
| 17 | $num="ebp"; |
| 18 | |
| 19 | &mov($r,&wparam(0)); # get r |
| 20 | &mov($a,&wparam(1)); # get a |
| 21 | &mov($b,&wparam(2)); # get b |
| 22 | &mov($num,&wparam(3)); # get num |
| 23 | &xor($c,$c); # clear carry |
| 24 | &and($num,0xfffffff8); # num / 8 |
| 25 | |
| 26 | &jz(&label("aw_finish")); |
| 27 | |
| 28 | &set_label("aw_loop",0); |
| 29 | for ($i=0; $i<8; $i++) |
| 30 | { |
| 31 | &comment("Round $i"); |
| 32 | |
| 33 | &mov($tmp1,&DWP($i*4,$a,"",0)); # *a |
| 34 | &mov($tmp2,&DWP($i*4,$b,"",0)); # *b |
| 35 | &sub($tmp1,$c); |
| 36 | &mov($c,0); |
| 37 | &adc($c,$c); |
| 38 | &sub($tmp1,$tmp2); |
| 39 | &adc($c,0); |
| 40 | &mov(&DWP($i*4,$r,"",0),$tmp1); # *r |
| 41 | } |
| 42 | |
| 43 | &comment(""); |
| 44 | &add($a,32); |
| 45 | &add($b,32); |
| 46 | &add($r,32); |
| 47 | &sub($num,8); |
| 48 | &jnz(&label("aw_loop")); |
| 49 | |
| 50 | &set_label("aw_finish",0); |
| 51 | &mov($num,&wparam(3)); # get num |
| 52 | &and($num,7); |
| 53 | &jz(&label("aw_end")); |
| 54 | |
| 55 | for ($i=0; $i<7; $i++) |
| 56 | { |
| 57 | &comment("Tail Round $i"); |
| 58 | &mov($tmp1,&DWP($i*4,$a,"",0)); # *a |
| 59 | &mov($tmp2,&DWP($i*4,$b,"",0));# *b |
| 60 | &sub($tmp1,$c); |
| 61 | &mov($c,0); |
| 62 | &adc($c,$c); |
| 63 | &sub($tmp1,$tmp2); |
| 64 | &adc($c,0); |
| 65 | &dec($num) if ($i != 6); |
| 66 | &mov(&DWP($i*4,$r,"",0),$tmp1); # *a |
| 67 | &jz(&label("aw_end")) if ($i != 6); |
| 68 | } |
| 69 | &set_label("aw_end",0); |
| 70 | |
| 71 | # &mov("eax",$c); # $c is "eax" |
| 72 | |
| 73 | &function_end($name); |
| 74 | } |
| 75 | |
| 76 | 1; |