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#!/usr/bin/env perl
#
# ====================================================================
# Written by Andy Polyakov <appro@fy.chalmers.se> for the OpenSSL
# project. Rights for redistribution and usage in source and binary
# forms are granted according to the OpenSSL license.
# ====================================================================
#
# You might fail to appreciate this module performance from the first
# try. If compared to "vanilla" linux-ia32-icc target, i.e. Intel C
# without -KPIC, performance appears to be virtually identical... But
# try to configure with shared library support... Aha! Intel compiler
# "suddenly" lags behind by 30% [on P4]:-) And if compared to
# position-independent code generated by GNU C, this code performs
# more than *twice* as fast! Yes, all this buzz about PIC means that
# [unlike other implementations] this module was explicitly designed
# to be safe to use even in shared library context...
#
# Special note about instruction choice. Do you recall RC4_INT code
# performing poorly on P4? It might be the time to figure out why.
# RC4_INT code implies effective address calculations in base+offset*4
# form. Trouble is that it seems that offset scaling turned to be
# critical path... At least eliminating scaling resulted in 2.8x RC4
# performance improvement [as you might recall]. As AES code is hungry
# for scaling too, I [try to] avoid the latter by favoring off-by-2
# shifts and masking the result with 0xFF<<2 instead of "boring" 0xFF.
push(@INC,"perlasm","../../perlasm");
require "x86asm.pl";
&asm_init($ARGV[0],"aes-586.pl",$ARGV[$#ARGV] eq "386");
$small_footprint=1; # $small_footprint=1 code is 5-9% slower, but
# 5 times smaller! I default to compact code.
$s0="eax";
$s1="ebx";
$s2="ecx";
$s3="edx";
sub encstep()
{ my ($i,$te,@s) = @_;
my $tmp,$out;
if ($i==3) { $out=$s[0]; &mov ("edi",&DWP(12,"esp"));}
else { $out="esi"; &mov ($out,$s[0]); }
&shr ($out,24-2);
&and ($out,0xFF<<2);
&mov ($out,&DWP(1024*0,$te,$out));
if ($i==3) { $tmp=$s[1]; }
else { $tmp="edi"; &mov ($tmp,$s[1]); }
&shr ($tmp,16-2);
&and ($tmp,0xFF<<2);
&xor ($out,&DWP(1024*1,$te,$tmp));
if ($i==3) { $tmp=$s[2]; &mov ($s[1],&DWP(0,"esp")); }
else { $tmp="edi"; }
&movz ($tmp,&HB($s[2]));
&xor ($out,&DWP(1024*2,$te,$tmp,4));
if ($i==3) { $tmp=$s[3]; &mov ($s[2],&DWP(4,"esp")); }
else { $tmp="edi"; &mov ($tmp,$s[3]); }
&and ($tmp,0xFF);
&xor ($out,&DWP(1024*3,$te,$tmp,4));
if ($i<2) { &mov (&DWP(4*$i,"esp"),$out); }
if ($i==3) { &mov ($s[3],"esi"); }
}
sub enclast()
{ my ($i,$te,@s)=@_;
my $tmp,$out;
if ($i==3) { $out=$s[0]; &mov ("edi",&DWP(12,"esp"));}
else { $out="esi"; &mov ($out,$s[0]); }
&shr ($out,24-2);
&and ($out,0xFF<<2);
&mov ($out,&DWP(0,$te,$out));
&and ($out,0xff000000);
if ($i==3) { $tmp=$s[1]; }
else { $tmp="edi"; &mov ($tmp,$s[1]); }
&shr ($tmp,16-2);
&and ($tmp,0xFF<<2);
&mov ($tmp,&DWP(0,$te,$tmp));
&and ($tmp,0x00ff0000);
&xor ($out,$tmp);
if ($i==3) { $tmp=$s[2]; &mov ($s[1],&DWP(0,"esp")); }
else { $tmp="edi"; }
&movz ($tmp,&HB($s[2]));
&mov ($tmp,&DWP(0,$te,$tmp,4));
&and ($tmp,0x0000ff00);
&xor ($out,$tmp);
if ($i==3) { $tmp=$s[3]; &mov ($s[2],&DWP(4,"esp")); }
else { $tmp="edi"; &mov ($tmp,$s[3]); }
&and ($tmp,0xFF);
&mov ($tmp,&DWP(0,$te,$tmp,4));
&and ($tmp,0x000000ff);
&xor ($out,$tmp);
if ($i<2) { &mov (&DWP(4*$i,"esp"),$out); }
if ($i==3) { &mov ($s[3],"esi"); }
}
# void AES_encrypt (const void *inp,void *out,const AES_KEY *key);
&public_label("AES_Te");
&function_begin("AES_encrypt");
&mov ("esi",&wparam(0)); # load inp
&mov ("edi",&wparam(2)); # load key
&call (&label("pic_point")); # make it PIC!
&set_label("pic_point");
&blindpop("ebp");
&lea ("ebp",&DWP(&label("AES_Te")."-".&label("pic_point"),"ebp"));
# allocate aligned stack frame
&mov ("eax","esp");
&sub ("esp",20);
&and ("esp",-16);
&mov (&DWP(12,"esp"),"edi"); # save key
&mov (&DWP(16,"esp"),"eax"); # save %esp
&mov ($s0,&DWP(0,"esi")); # load input data
&mov ($s1,&DWP(4,"esi"));
&mov ($s2,&DWP(8,"esi"));
&mov ($s3,&DWP(12,"esi"));
#
# It's perfectly possible to implement algorithm as
# little-endian and get rid of bswaps... It would give
# less than 1% performance improvement, so I judge it
# doesn't worth the trouble...
#
&bswap ($s0);
&bswap ($s1);
&bswap ($s2);
&bswap ($s3);
&xor ($s0,&DWP(0,"edi"));
&xor ($s1,&DWP(4,"edi"));
&xor ($s2,&DWP(8,"edi"));
&xor ($s3,&DWP(12,"edi"));
&mov ("esi",&DWP(240,"edi")); # load key->rounds
if ($small_footprint) {
&lea ("esi",&DWP(-2,"esi","esi"));
&lea ("esi",&DWP(0,"edi","esi",8));
&mov (&DWP(8,"esp"),"esi"); # end of key schedule
&align (4);
&set_label("loop");
&encstep(0,"ebp",$s0,$s1,$s2,$s3);
&encstep(1,"ebp",$s1,$s2,$s3,$s0);
&encstep(2,"ebp",$s2,$s3,$s0,$s1);
&encstep(3,"ebp",$s3,$s0,$s1,$s2);
&add ("edi",16); # advance rd_key
&xor ($s0,&DWP(0,"edi"));
&xor ($s1,&DWP(4,"edi"));
&xor ($s2,&DWP(8,"edi"));
&xor ($s3,&DWP(12,"edi"));
&cmp ("edi",&DWP(8,"esp"));
&mov (&DWP(12,"esp"),"edi");
&jb (&label("loop"));
}
else {
&cmp ("esi",10);
&jle (&label("10rounds"));
&cmp ("esi",12);
&jle (&label("12rounds"));
&set_label("14rounds");
for ($i=1;$i<3;$i++) {
&encstep(0,"ebp",$s0,$s1,$s2,$s3);
&encstep(1,"ebp",$s1,$s2,$s3,$s0);
&encstep(2,"ebp",$s2,$s3,$s0,$s1);
&encstep(3,"ebp",$s3,$s0,$s1,$s2);
&xor ($s0,&DWP(16*$i+0,"edi"));
&xor ($s1,&DWP(16*$i+4,"edi"));
&xor ($s2,&DWP(16*$i+8,"edi"));
&xor ($s3,&DWP(16*$i+12,"edi"));
}
&add ("edi",32);
&mov (&DWP(12,"esp"),"edi"); # advance rd_key
&set_label("12rounds");
for ($i=1;$i<3;$i++) {
&encstep(0,"ebp",$s0,$s1,$s2,$s3);
&encstep(1,"ebp",$s1,$s2,$s3,$s0);
&encstep(2,"ebp",$s2,$s3,$s0,$s1);
&encstep(3,"ebp",$s3,$s0,$s1,$s2);
&xor ($s0,&DWP(16*$i+0,"edi"));
&xor ($s1,&DWP(16*$i+4,"edi"));
&xor ($s2,&DWP(16*$i+8,"edi"));
&xor ($s3,&DWP(16*$i+12,"edi"));
}
&add ("edi",32);
&mov (&DWP(12,"esp"),"edi"); # advance rd_key
&set_label("10rounds");
for ($i=1;$i<10;$i++) {
&encstep(0,"ebp",$s0,$s1,$s2,$s3);
&encstep(1,"ebp",$s1,$s2,$s3,$s0);
&encstep(2,"ebp",$s2,$s3,$s0,$s1);
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