ref: e14d6249749a1101abdad7998e1cd5cdc49e137a
dir: /sys/src/ape/lib/openssl/crypto/aes/asm/aes-586.pl/
#!/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.
# ====================================================================
#
# Version 3.6.
#
# You might fail to appreciate this module performance from the first
# try. If compared to "vanilla" linux-ia32-icc target, i.e. considered
# to be *the* best Intel C compiler without -KPIC, performance appears
# to be virtually identical... But try to re-configure with shared
# library support... Aha! Intel compiler "suddenly" lags behind by 30%
# [on P4, more on others]:-) 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 hand-
# coded implementations, this one was explicitly designed to be safe
# to use even in shared library context... This also means that this
# code isn't necessarily absolutely fastest "ever," because in order
# to achieve position independence an extra register has to be
# off-loaded to stack, which affects the benchmark result.
#
# 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.
#
# As was shown by Dean Gaudet <dean@arctic.org>, the above note turned
# void. Performance improvement with off-by-2 shifts was observed on
# intermediate implementation, which was spilling yet another register
# to stack... Final offset*4 code below runs just a tad faster on P4,
# but exhibits up to 10% improvement on other cores.
#
# Second version is "monolithic" replacement for aes_core.c, which in
# addition to AES_[de|en]crypt implements AES_set_[de|en]cryption_key.
# This made it possible to implement little-endian variant of the
# algorithm without modifying the base C code. Motivating factor for
# the undertaken effort was that it appeared that in tight IA-32
# register window little-endian flavor could achieve slightly higher
# Instruction Level Parallelism, and it indeed resulted in up to 15%
# better performance on most recent �-archs...
#
# Third version adds AES_cbc_encrypt implementation, which resulted in
# up to 40% performance imrovement of CBC benchmark results. 40% was
# observed on P4 core, where "overall" imrovement coefficient, i.e. if
# compared to PIC generated by GCC and in CBC mode, was observed to be
# as large as 4x:-) CBC performance is virtually identical to ECB now
# and on some platforms even better, e.g. 17.6 "small" cycles/byte on
# Opteron, because certain function prologues and epilogues are
# effectively taken out of the loop...
#
# Version 3.2 implements compressed tables and prefetch of these tables
# in CBC[!] mode. Former means that 3/4 of table references are now
# misaligned, which unfortunately has negative impact on elder IA-32
# implementations, Pentium suffered 30% penalty, PIII - 10%.
#
# Version 3.3 avoids L1 cache aliasing between stack frame and
# S-boxes, and 3.4 - L1 cache aliasing even between key schedule. The
# latter is achieved by copying the key schedule to controlled place in
# stack. This unfortunately has rather strong impact on small block CBC
# performance, ~2x deterioration on 16-byte block if compared to 3.3.
#
# Version 3.5 checks if there is L1 cache aliasing between user-supplied
# key schedule and S-boxes and abstains from copying the former if
# there is no. This allows end-user to consciously retain small block
# performance by aligning key schedule in specific manner.
#
# Version 3.6 compresses Td4 to 256 bytes and prefetches it in ECB.
#
# Current ECB performance numbers for 128-bit key in CPU cycles per
# processed byte [measure commonly used by AES benchmarkers] are:
#
# small footprint fully unrolled
# P4 24 22
# AMD K8 20 19
# PIII 25 23
# Pentium 81 78
push(@INC,"perlasm","../../perlasm");
require "x86asm.pl";
&asm_init($ARGV[0],"aes-586.pl",$ARGV[$#ARGV] eq "386");
$s0="eax";
$s1="ebx";
$s2="ecx";
$s3="edx";
$key="edi";
$acc="esi";
$compromise=0; # $compromise=128 abstains from copying key
# schedule to stack when encrypting inputs
# shorter than 128 bytes at the cost of
# risksing aliasing with S-boxes. In return
# you get way better, up to +70%, small block
# performance.
$small_footprint=1; # $small_footprint=1 code is ~5% slower [on
# recent �-archs], but ~5 times smaller!
# I favor compact code to minimize cache
# contention and in hope to "collect" 5% back
# in real-life applications...
$vertical_spin=0; # shift "verticaly" defaults to 0, because of
# its proof-of-concept status...
# Note that there is no decvert(), as well as last encryption round is
# performed with "horizontal" shifts. This is because this "vertical"
# implementation [one which groups shifts on a given $s[i] to form a
# "column," unlike "horizontal" one, which groups shifts on different
# $s[i] to form a "row"] is work in progress. It was observed to run
# few percents faster on Intel cores, but not AMD. On AMD K8 core it's
# whole 12% slower:-( So we face a trade-off... Shall it be resolved
# some day? Till then the code is considered experimental and by
# default remains dormant...
sub encvert()
{ my ($te,@s) = @_;
my $v0 = $acc, $v1 = $key;
&mov ($v0,$s[3]); # copy s3
&mov (&DWP(4,"esp"),$s[2]); # save s2
&mov ($v1,$s[0]); # copy s0
&mov (&DWP(8,"esp"),$s[1]); # save s1
&movz ($s[2],&HB($s[0]));
&and ($s[0],0xFF);
&mov ($s[0],&DWP(0,$te,$s[0],8)); # s0>>0
&shr ($v1,16);
&mov ($s[3],&DWP(3,$te,$s[2],8)); # s0>>8
&movz ($s[1],&HB($v1));
&and ($v1,0xFF);
&mov ($s[2],&DWP(2,$te,$v1,8)); # s0>>16
&mov ($v1,$v0);
&mov ($s[1],&DWP(1,$te,$s[1],8)); # s0>>24
&and ($v0,0xFF);
&xor ($s[3],&DWP(0,$te,$v0,8)); # s3>>0
&movz ($v0,&HB($v1));
&shr ($v1,16);
&xor ($s[2],&DWP(3,$te,$v0,8)); # s3>>8
&movz ($v0,&HB($v1));
&and ($v1,0xFF);
&xor ($s[1],&DWP(2,$te,$v1,8)); # s3>>16
&mov ($v1,&DWP(4,"esp")); # restore s2
&xor ($s[0],&DWP(1,$te,$v0,8)); # s3>>24
&mov ($v0,$v1);
&and ($v1,0xFF);
&xor ($s[2],&DWP(0,$te,$v1,8)); # s2>>0
&movz ($v1,&HB($v0));
&shr ($v0,16);
&xor ($s[1],&DWP(3,$te,$v1,8)); # s2>>8
&movz ($v1,&HB($v0));
&and ($v0,0xFF);
&xor ($s[0],&DWP(2,$te,$v0,8)); # s2>>16
&mov ($v0,&DWP(8,"esp")); # restore s1
&xor ($s[3],&DWP(1,$te,$v1,8)); # s2>>24
&mov ($v1,$v0);
&and ($v0,0xFF);
&xor ($s[1],&DWP(0,$te,$v0,8)); # s1>>0
&movz ($v0,&HB($v1));
&shr ($v1,16);
&xor ($s[0],&DWP(3,$te,$v0,8)); # s1>>8
&movz ($v0,&HB($v1));
&and ($v1,0xFF);
&xor ($s[3],&DWP(2,$te,$v1,8)); # s1>>16
&mov ($key,&DWP(12,"esp")); # reincarnate v1 as key
&xor ($s[2],&DWP(1,$te,$v0,8)); # s1>>24
}
sub encstep()
{ my ($i,$te,@s) = @_;
my $tmp = $key;
my $out = $i==3?$s[0]:$acc;
# lines marked with #%e?x[i] denote "reordered" instructions...
if ($i==3) { &mov ($key,&DWP(12,"esp")); }##%edx
else { &mov ($out,$s[0]);
&and ($out,0xFF); }
if ($i==1) { &shr ($s[0],16); }#%ebx[1]
if ($i==2) { &shr ($s[0],24); }#%ecx[2]
&mov ($out,&DWP(0,$te,$out,8));
if ($i==3) { $tmp=$s[1]; }##%eax
&movz ($tmp,&HB($s[1]));
&xor ($out,&DWP(3,$te,$tmp,8));
if ($i==3) { $tmp=$s[2]; &mov ($s[1],&DWP(4,"esp")); }##%ebx
else { &mov ($tmp,$s[2]);
&shr ($tmp,16); }
if ($i==2) { &and ($s[1],0xFF); }#%edx[2]
&and ($tmp,0xFF);
&xor ($out,&DWP(2,$te,$tmp,8));
if ($i==3) { $tmp=$s[3]; &mov ($s[2],&DWP(8,"esp")); }##%ecx
elsif($i==2){ &movz ($tmp,&HB($s[3])); }#%ebx[2]
else { &mov ($tmp,$s[3]);
&shr ($tmp,24) }
&xor ($out,&DWP(1,$te,$tmp,8));
if ($i<2) { &mov (&DWP(4+4*$i,"esp"),$out); }
if ($i==3) { &mov ($s[3],$acc); }
&comment();
}
sub enclast()
{ my ($i,$te,@s)=@_;
my $tmp = $key;
my $out = $i==3?$s[0]:$acc;
if ($i==3) { &mov ($key,&DWP(12,"esp")); }##%edx
else { &mov ($out,$s[0]); }
&and ($out,0xFF);
if ($i==1) { &shr ($s[0],16); }#%ebx[1]
if ($i==2) { &shr ($s[0],24); }#%ecx[2]
&mov ($out,&DWP(2,$te,$out,8));
&and ($out,0x000000ff);
if ($i==3) { $tmp=$s[1]; }##%eax
&movz ($tmp,&HB($s[1]));
&mov ($tmp,&DWP(0,$te,$tmp,8));
&and ($tmp,0x0000ff00);
&xor ($out,$tmp);
if ($i==3) { $tmp=$s[2]; &mov ($s[1],&DWP(4,"esp")); }##%ebx
else { mov ($tmp,$s[2]);
&shr ($tmp,16); }
if ($i==2) { &and ($s[1],0xFF); }#%edx[2]
&and ($tmp,0xFF);
&mov ($tmp,&DWP(0,$te,$tmp,8));
&and ($tmp,0x00ff0000);
&xor ($out,$tmp);
if ($i==3) { $tmp=$s[3]; &mov ($s[2],&DWP(8,"esp")); }##%ecx
elsif($i==2){ &movz ($tmp,&HB($s[3])); }#%ebx[2]
else { &mov ($tmp,$s[3]);
&shr ($tmp,24); }
&mov ($tmp,&DWP(2,$te,$tmp,8));
&and ($tmp,0xff000000);
&xor ($out,$tmp);
if ($i<2) { &mov (&DWP(4+4*$i,"esp"),$out); }
if ($i==3) { &mov ($s[3],$acc); }
}
sub _data_word() { my $i; while(defined($i=shift)) { &data_word($i,$i); } }
&public_label("AES_Te");
&function_begin_B("_x86_AES_encrypt");
if ($vertical_spin) {
# I need high parts of volatile registers to be accessible...
&exch ($s1="edi",$key="ebx");
&mov ($s2="esi",$acc="ecx");
}
# note that caller is expected to allocate stack frame for me!
&mov (&DWP(12,"esp"),$key); # save key
&xor ($s0,&DWP(0,$key)); # xor with key
&xor ($s1,&DWP(4,$key));
&xor ($s2,&DWP(8,$key));
&xor ($s3,&DWP(12,$key));
&mov ($acc,&DWP(240,$key)); # load key->rounds
if ($small_footprint) {
&lea ($acc,&DWP(-2,$acc,$acc));
&lea ($acc,&DWP(0,$key,$acc,8));
&mov (&DWP(16,"esp"),$acc); # end of key schedule
&align (4);
&set_label("loop");
if ($vertical_spin) {
&encvert("ebp",$s0,$s1,$s2,$s3);
} else {
&encstep(0,"ebp",$s0,$s1,$s2,$s3);
&encstep(1,"ebp",$s1,$s2,$s3,$s0);
&encstep(2,"ebp",$s2,$s3,$s0,$s1);
&encstep(3,"ebp",$s3,$s0,$s1,$s2);
}
&add ($key,16); # advance rd_key
&xor ($s0,&DWP(0,$key));
&xor ($s1,&DWP(4,$key));
&xor ($s2,&DWP(8,$key));
&xor ($s3,&DWP(12,$key));
&cmp ($key,&DWP(16,"esp"));
&mov (&DWP(12,"esp"),$key);
&jb (&label("loop"));
}
else {
&cmp ($acc,10);
&jle (&label("10rounds"));
&cmp ($acc,12);
&jle (&label("12rounds"));
&set_label("14rounds");
for ($i=1;$i<3;$i++) {
if ($vertical_spin) {
&encvert("ebp",$s0,$s1,$s2,$s3);
} else {
&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,$key));
&xor ($s1,&DWP(16*$i+4,$key));
&xor ($s2,&DWP(16*$i+8,$key));
&xor ($s3,&DWP(16*$i+12,$key));
}
&add ($key,32);
&mov (&DWP(12,"esp"),$key); # advance rd_key
&set_label("12rounds");
for ($i=1;$i<3;$i++) {
if ($vertical_spin) {
&encvert("ebp",$s0,$s1,$s2,$s3);
} else {
&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,$key));
&xor ($s1,&DWP(16*$i+4,$key));
&xor ($s2,&DWP(16*$i+8,$key));
&xor ($s3,&DWP(16*$i+12,$key));
}
&add ($key,32);
&mov (&DWP(12,"esp"),$key); # advance rd_key
&set_label("10rounds");
for ($i=1;$i<10;$i++) {
if ($vertical_spin) {
&encvert("ebp",$s0,$s1,$s2,$s3);
} else {
&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,$key));
&xor ($s1,&DWP(16*$i+4,$key));
&xor ($s2,&DWP(16*$i+8,$key));
&xor ($s3,&DWP(16*$i+12,$key));
}
}
if ($vertical_spin) {
# "reincarnate" some registers for "horizontal" spin...
&mov ($s1="ebx",$key="edi");
&mov ($s2="ecx",$acc="esi");
}
&enclast(0,"ebp",$s0,$s1,$s2,$s3);
&enclast(1,"ebp",$s1,$s2,$s3,$s0);
&enclast(2,"ebp",$s2,$s3,$s0,$s1);
&enclast(3,"ebp",$s3,$s0,$s1,$s2);
&add ($key,$small_footprint?16:160);
&xor ($s0,&DWP(0,$key));
&xor ($s1,&DWP(4,$key));
&xor ($s2,&DWP(8,$key));
&xor ($s3,&DWP(12,$key));
&ret ();
&set_label("AES_Te",64); # Yes! I keep it in the code segment!
&_data_word(0xa56363c6, 0x847c7cf8, 0x997777ee, 0x8d7b7bf6);
&_data_word(0x0df2f2ff, 0xbd6b6bd6, 0xb16f6fde, 0x54c5c591);
&_data_word(0x50303060, 0x03010102, 0xa96767ce, 0x7d2b2b56);
&_data_word(0x19fefee7, 0x62d7d7b5, 0xe6abab4d, 0x9a7676ec);
&_data_word(0x45caca8f, 0x9d82821f, 0x40c9c989, 0x877d7dfa);
&_data_word(0x15fafaef, 0xeb5959b2, 0xc947478e, 0x0bf0f0fb);
&_data_word(0xecadad41, 0x67d4d4b3, 0xfda2a25f, 0xeaafaf45);
&_data_word(0xbf9c9c23, 0xf7a4a453, 0x967272e4, 0x5bc0c09b);
&_data_word(0xc2b7b775, 0x1cfdfde1, 0xae93933d, 0x6a26264c);
&_data_word(0x5a36366c, 0x413f3f7e, 0x02f7f7f5, 0x4fcccc83);
&_data_word(0x5c343468, 0xf4a5a551, 0x34e5e5d1, 0x08f1f1f9);
&_data_word(0x937171e2, 0x73d8d8ab, 0x53313162, 0x3f15152a);
&_data_word(0x0c040408, 0x52c7c795, 0x65232346, 0x5ec3c39d);
&_data_word(0x28181830, 0xa1969637, 0x0f05050a, 0xb59a9a2f);
&_data_word(0x0907070e, 0x36121224, 0x9b80801b, 0x3de2e2df);
&_data_word(0x26ebebcd, 0x6927274e, 0xcdb2b27f, 0x9f7575ea);
&_data_word(0x1b090912, 0x9e83831d, 0x742c2c58, 0x2e1a1a34);
&_data_word(0x2d1b1b36, 0xb26e6edc, 0xee5a5ab4, 0xfba0a05b);
&_data_word(0xf65252a4, 0x4d3b3b76, 0x61d6d6b7, 0xceb3b37d);
&_data_word(0x7b292952, 0x3ee3e3dd, 0x712f2f5e, 0x97848413);
&_data_word(0xf55353a6, 0x68d1d1b9, 0x00000000, 0x2cededc1);
&_data_word(0x60202040, 0x1ffcfce3, 0xc8b1b179, 0xed5b5bb6);
&_data_word(0xbe6a6ad4, 0x46cbcb8d, 0xd9bebe67, 0x4b393972);
&_data_word(0xde4a4a94, 0xd44c4c98, 0xe85858b0, 0x4acfcf85);
&_data_word(0x6bd0d0bb, 0x2aefefc5, 0xe5aaaa4f, 0x16fbfbed);
&_data_word(0xc5434386, 0xd74d4d9a, 0x55333366, 0x94858511);
&_data_word(0xcf45458a, 0x10f9f9e9, 0x06020204, 0x817f7ffe);
&_data_word(0xf05050a0, 0x443c3c78, 0xba9f9f25, 0xe3a8a84b);
&_data_word(0xf35151a2, 0xfea3a35d, 0xc0404080, 0x8a8f8f05);
&_data_word(0xad92923f, 0xbc9d9d21, 0x48383870, 0x04f5f5f1);
&_data_word(0xdfbcbc63, 0xc1b6b677, 0x75dadaaf, 0x63212142);
&_data_word(0x30101020, 0x1affffe5, 0x0ef3f3fd, 0x6dd2d2bf);
&_data_word(0x4ccdcd81, 0x140c0c18, 0x35131326, 0x2fececc3);
&_data_word(0xe15f5fbe, 0xa2979735, 0xcc444488, 0x3917172e);
&_data_word(0x57c4c493, 0xf2a7a755, 0x827e7efc, 0x473d3d7a);
&_data_word(0xac6464c8, 0xe75d5dba, 0x2b191932, 0x957373e6);
&_data_word(0xa06060c0, 0x98818119, 0xd14f4f9e, 0x7fdcdca3);
&_data_word(0x66222244, 0x7e2a2a54, 0xab90903b, 0x8388880b);
&_data_word(0xca46468c, 0x29eeeec7, 0xd3b8b86b, 0x3c141428);
&_data_word(0x79dedea7, 0xe25e5ebc, 0x1d0b0b16, 0x76dbdbad);
&_data_word(0x3be0e0db, 0x56323264, 0x4e3a3a74, 0x1e0a0a14);
&_data_word(0xdb494992, 0x0a06060c, 0x6c242448, 0xe45c5cb8);
&_data_word(0x5dc2c29f, 0x6ed3d3bd, 0xefacac43, 0xa66262c4);
&_data_word(0xa8919139, 0xa4959531, 0x37e4e4d3, 0x8b7979f2);
&_data_word(0x32e7e7d5, 0x43c8c88b, 0x5937376e, 0xb76d6dda);
&_data_word(0x8c8d8d01, 0x64d5d5b1, 0xd24e4e9c, 0xe0a9a949);
&_data_word(0xb46c6cd8, 0xfa5656ac, 0x07f4f4f3, 0x25eaeacf);
&_data_word(0xaf6565ca, 0x8e7a7af4, 0xe9aeae47, 0x18080810);
&_data_word(0xd5baba6f, 0x887878f0, 0x6f25254a, 0x722e2e5c);
&_data_word(0x241c1c38, 0xf1a6a657, 0xc7b4b473, 0x51c6c697);
&_data_word(0x23e8e8cb, 0x7cdddda1, 0x9c7474e8, 0x211f1f3e);
&_data_word(0xdd4b4b96, 0xdcbdbd61, 0x868b8b0d, 0x858a8a0f);
&_data_word(0x907070e0, 0x423e3e7c, 0xc4b5b571, 0xaa6666cc);
&_data_word(0xd8484890, 0x05030306, 0x01f6f6f7, 0x120e0e1c);
&_data_word(0xa36161c2, 0x5f35356a, 0xf95757ae, 0xd0b9b969);
&_data_word(0x91868617, 0x58c1c199, 0x271d1d3a, 0xb99e9e27);
&_data_word(0x38e1e1d9, 0x13f8f8eb, 0xb398982b, 0x33111122);
&_data_word(0xbb6969d2, 0x70d9d9a9, 0x898e8e07, 0xa7949433);
&_data_word(0xb69b9b2d, 0x221e1e3c, 0x92878715, 0x20e9e9c9);
&_data_word(0x49cece87, 0xff5555aa, 0x78282850, 0x7adfdfa5);
&_data_word(0x8f8c8c03, 0xf8a1a159, 0x80898909, 0x170d0d1a);
&_data_word(0xdabfbf65, 0x31e6e6d7, 0xc6424284, 0xb86868d0);
&_data_word(0xc3414182, 0xb0999929, 0x772d2d5a, 0x110f0f1e);
&_data_word(0xcbb0b07b, 0xfc5454a8, 0xd6bbbb6d, 0x3a16162c);
#rcon:
&data_word(0x00000001, 0x00000002, 0x00000004, 0x00000008);
&data_word(0x00000010, 0x00000020, 0x00000040, 0x00000080);
&data_word(0x0000001b, 0x00000036, 0, 0, 0, 0, 0, 0);
&function_end_B("_x86_AES_encrypt");
# void AES_encrypt (const void *inp,void *out,const AES_KEY *key);
&public_label("AES_Te");
&function_begin("AES_encrypt");
&mov ($acc,&wparam(0)); # load inp
&mov ($key,&wparam(2)); # load key
&mov ($s0,"esp");
&sub ("esp",24);
&and ("esp",-64);
&add ("esp",4);
&mov (&DWP(16,"esp"),$s0);
&call (&label("pic_point")); # make it PIC!
&set_label("pic_point");
&blindpop("ebp");
&lea ("ebp",&DWP(&label("AES_Te")."-".&label("pic_point"),"ebp"));
&mov ($s0,&DWP(0,$acc)); # load input data
&mov ($s1,&DWP(4,$acc));
&mov ($s2,&DWP(8,$acc));
&mov ($s3,&DWP(12,$acc));
&call ("_x86_AES_encrypt");
&mov ("esp",&DWP(16,"esp"));
&mov ($acc,&wparam(1)); # load out
&mov (&DWP(0,$acc),$s0); # write output data
&mov (&DWP(4,$acc),$s1);
&mov (&DWP(8,$acc),$s2);
&mov (&DWP(12,$acc),$s3);
&function_end("AES_encrypt");
#------------------------------------------------------------------#
sub decstep()
{ my ($i,$td,@s) = @_;
my $tmp = $key;
my $out = $i==3?$s[0]:$acc;
# no instructions are reordered, as performance appears
# optimal... or rather that all attempts to reorder didn't
# result in better performance [which by the way is not a
# bit lower than ecryption].
if($i==3) { &mov ($key,&DWP(12,"esp")); }
else { &mov ($out,$s[0]); }
&and ($out,0xFF);
&mov ($out,&DWP(0,$td,$out,8));
if ($i==3) { $tmp=$s[1]; }
&movz ($tmp,&HB($s[1]));
&xor ($out,&DWP(3,$td,$tmp,8));
if ($i==3) { $tmp=$s[2]; &mov ($s[1],$acc); }
else { &mov ($tmp,$s[2]); }
&shr ($tmp,16);
&and ($tmp,0xFF);
&xor ($out,&DWP(2,$td,$tmp,8));
if ($i==3) { $tmp=$s[3]; &mov ($s[2],&DWP(8,"esp")); }
else { &mov ($tmp,$s[3]); }
&shr ($tmp,24);
&xor ($out,&DWP(1,$td,$tmp,8));
if ($i<2) { &mov (&DWP(4+4*$i,"esp"),$out); }
if ($i==3) { &mov ($s[3],&DWP(4,"esp")); }
&comment();
}
sub declast()
{ my ($i,$td,@s)=@_;
my $tmp = $key;
my $out = $i==3?$s[0]:$acc;
if($i==3) { &mov ($key,&DWP(12,"esp")); }
else { &mov ($out,$s[0]); }
&and ($out,0xFF);
&movz ($out,&BP(2048,$td,$out,1));
if ($i==3) { $tmp=$s[1]; }
&movz ($tmp,&HB($s[1]));
&movz ($tmp,&BP(2048,$td,$tmp,1));
&shl ($tmp,8);
&xor ($out,$tmp);
if ($i==3) { $tmp=$s[2]; &mov ($s[1],$acc); }
else { mov ($tmp,$s[2]); }
&shr ($tmp,16);
&and ($tmp,0xFF);
&movz ($tmp,&BP(2048,$td,$tmp,1));
&shl ($tmp,16);
&xor ($out,$tmp);
if ($i==3) { $tmp=$s[3]; &mov ($s[2],&DWP(8,"esp")); }
else { &mov ($tmp,$s[3]); }
&shr ($tmp,24);
&movz ($tmp,&BP(2048,$td,$tmp,1));
&shl ($tmp,24);
&xor ($out,$tmp);
if ($i<2) { &mov (&DWP(4+4*$i,"esp"),$out); }
if ($i==3) { &mov ($s[3],&DWP(4,"esp")); }
}
&public_label("AES_Td");
&function_begin_B("_x86_AES_decrypt");
# note that caller is expected to allocate stack frame for me!
&mov (&DWP(12,"esp"),$key); # save key
&xor ($s0,&DWP(0,$key)); # xor with key
&xor ($s1,&DWP(4,$key));
&xor ($s2,&DWP(8,$key));
&xor ($s3,&DWP(12,$key));
&mov ($acc,&DWP(240,$key)); # load key->rounds
if ($small_footprint) {
&lea ($acc,&DWP(-2,$acc,$acc));
&lea ($acc,&DWP(0,$key,$acc,8));
&mov (&DWP(16,"esp"),$acc); # end of key schedule
&align (4);
&set_label("loop");
&decstep(0,"ebp",$s0,$s3,$s2,$s1);
&decstep(1,"ebp",$s1,$s0,$s3,$s2);
&decstep(2,"ebp",$s2,$s1,$s0,$s3);
&decstep(3,"ebp",$s3,$s2,$s1,$s0);
&add ($key,16); # advance rd_key
&xor ($s0,&DWP(0,$key));
&xor ($s1,&DWP(4,$key));
&xor ($s2,&DWP(8,$key));
&xor ($s3,&DWP(12,$key));
&cmp ($key,&DWP(16,"esp"));
&mov (&DWP(12,"esp"),$key);
&jb (&label("loop"));
}
else {
&cmp ($acc,10);
&jle (&label("10rounds"));
&cmp ($acc,12);
&jle (&label("12rounds"));
&set_label("14rounds");
for ($i=1;$i<3;$i++) {
&decstep(0,"ebp",$s0,$s3,$s2,$s1);
&decstep(1,"ebp",$s1,$s0,$s3,$s2);
&decstep(2,"ebp",$s2,$s1,$s0,$s3);
&decstep(3,"ebp",$s3,$s2,$s1,$s0);
&xor ($s0,&DWP(16*$i+0,$key));
&xor ($s1,&DWP(16*$i+4,$key));
&xor ($s2,&DWP(16*$i+8,$key));
&xor ($s3,&DWP(16*$i+12,$key));
}
&add ($key,32);
&mov (&DWP(12,"esp"),$key); # advance rd_key
&set_label("12rounds");
for ($i=1;$i<3;$i++) {
&decstep(0,"ebp",$s0,$s3,$s2,$s1);
&decstep(1,"ebp",$s1,$s0,$s3,$s2);
&decstep(2,"ebp",$s2,$s1,$s0,$s3);
&decstep(3,"ebp",$s3,$s2,$s1,$s0);
&xor ($s0,&DWP(16*$i+0,$key));
&xor ($s1,&DWP(16*$i+4,$key));
&xor ($s2,&DWP(16*$i+8,$key));
&xor ($s3,&DWP(16*$i+12,$key));
}
&add ($key,32);
&mov (&DWP(12,"esp"),$key); # advance rd_key
&set_label("10rounds");
for ($i=1;$i<10;$i++) {
&decstep(0,"ebp",$s0,$s3,$s2,$s1);
&decstep(1,"ebp",$s1,$s0,$s3,$s2);
&decstep(2,"ebp",$s2,$s1,$s0,$s3);
&decstep(3,"ebp",$s3,$s2,$s1,$s0);
&xor ($s0,&DWP(16*$i+0,$key));
&xor ($s1,&DWP(16*$i+4,$key));
&xor ($s2,&DWP(16*$i+8,$key));
&xor ($s3,&DWP(16*$i+12,$key));
}
}
&declast(0,"ebp",$s0,$s3,$s2,$s1);
&declast(1,"ebp",$s1,$s0,$s3,$s2);
&declast(2,"ebp",$s2,$s1,$s0,$s3);
&declast(3,"ebp",$s3,$s2,$s1,$s0);
&add ($key,$small_footprint?16:160);
&xor ($s0,&DWP(0,$key));
&xor ($s1,&DWP(4,$key));
&xor ($s2,&DWP(8,$key));
&xor ($s3,&DWP(12,$key));
&ret ();
&set_label("AES_Td",64); # Yes! I keep it in the code segment!
&_data_word(0x50a7f451, 0x5365417e, 0xc3a4171a, 0x965e273a);
&_data_word(0xcb6bab3b, 0xf1459d1f, 0xab58faac, 0x9303e34b);
&_data_word(0x55fa3020, 0xf66d76ad, 0x9176cc88, 0x254c02f5);
&_data_word(0xfcd7e54f, 0xd7cb2ac5, 0x80443526, 0x8fa362b5);
&_data_word(0x495ab1de, 0x671bba25, 0x980eea45, 0xe1c0fe5d);
&_data_word(0x02752fc3, 0x12f04c81, 0xa397468d, 0xc6f9d36b);
&_data_word(0xe75f8f03, 0x959c9215, 0xeb7a6dbf, 0xda595295);
&_data_word(0x2d83bed4, 0xd3217458, 0x2969e049, 0x44c8c98e);
&_data_word(0x6a89c275, 0x78798ef4, 0x6b3e5899, 0xdd71b927);
&_data_word(0xb64fe1be, 0x17ad88f0, 0x66ac20c9, 0xb43ace7d);
&_data_word(0x184adf63, 0x82311ae5, 0x60335197, 0x457f5362);
&_data_word(0xe07764b1, 0x84ae6bbb, 0x1ca081fe, 0x942b08f9);
&_data_word(0x58684870, 0x19fd458f, 0x876cde94, 0xb7f87b52);
&_data_word(0x23d373ab, 0xe2024b72, 0x578f1fe3, 0x2aab5566);
&_data_word(0x0728ebb2, 0x03c2b52f, 0x9a7bc586, 0xa50837d3);
&_data_word(0xf2872830, 0xb2a5bf23, 0xba6a0302, 0x5c8216ed);
&_data_word(0x2b1ccf8a, 0x92b479a7, 0xf0f207f3, 0xa1e2694e);
&_data_word(0xcdf4da65, 0xd5be0506, 0x1f6234d1, 0x8afea6c4);
&_data_word(0x9d532e34, 0xa055f3a2, 0x32e18a05, 0x75ebf6a4);
&_data_word(0x39ec830b, 0xaaef6040, 0x069f715e, 0x51106ebd);
&_data_word(0xf98a213e, 0x3d06dd96, 0xae053edd, 0x46bde64d);
&_data_word(0xb58d5491, 0x055dc471, 0x6fd40604, 0xff155060);
&_data_word(0x24fb9819, 0x97e9bdd6, 0xcc434089, 0x779ed967);
&_data_word(0xbd42e8b0, 0x888b8907, 0x385b19e7, 0xdbeec879);
&_data_word(0x470a7ca1, 0xe90f427c, 0xc91e84f8, 0x00000000);
&_data_word(0x83868009, 0x48ed2b32, 0xac70111e, 0x4e725a6c);
&_data_word(0xfbff0efd, 0x5638850f, 0x1ed5ae3d, 0x27392d36);
&_data_word(0x64d90f0a, 0x21a65c68, 0xd1545b9b, 0x3a2e3624);
&_data_word(0xb1670a0c, 0x0fe75793, 0xd296eeb4, 0x9e919b1b);
&_data_word(0x4fc5c080, 0xa220dc61, 0x694b775a, 0x161a121c);
&_data_word(0x0aba93e2, 0xe52aa0c0, 0x43e0223c, 0x1d171b12);
&_data_word(0x0b0d090e, 0xadc78bf2, 0xb9a8b62d, 0xc8a91e14);
&_data_word(0x8519f157, 0x4c0775af, 0xbbdd99ee, 0xfd607fa3);
&_data_word(0x9f2601f7, 0xbcf5725c, 0xc53b6644, 0x347efb5b);
&_data_word(0x7629438b, 0xdcc623cb, 0x68fcedb6, 0x63f1e4b8);
&_data_word(0xcadc31d7, 0x10856342, 0x40229713, 0x2011c684);
&_data_word(0x7d244a85, 0xf83dbbd2, 0x1132f9ae, 0x6da129c7);
&_data_word(0x4b2f9e1d, 0xf330b2dc, 0xec52860d, 0xd0e3c177);
&_data_word(0x6c16b32b, 0x99b970a9, 0xfa489411, 0x2264e947);
&_data_word(0xc48cfca8, 0x1a3ff0a0, 0xd82c7d56, 0xef903322);
&_data_word(0xc74e4987, 0xc1d138d9, 0xfea2ca8c, 0x360bd498);
&_data_word(0xcf81f5a6, 0x28de7aa5, 0x268eb7da, 0xa4bfad3f);
&_data_word(0xe49d3a2c, 0x0d927850, 0x9bcc5f6a, 0x62467e54);
&_data_word(0xc2138df6, 0xe8b8d890, 0x5ef7392e, 0xf5afc382);
&_data_word(0xbe805d9f, 0x7c93d069, 0xa92dd56f, 0xb31225cf);
&_data_word(0x3b99acc8, 0xa77d1810, 0x6e639ce8, 0x7bbb3bdb);
&_data_word(0x097826cd, 0xf418596e, 0x01b79aec, 0xa89a4f83);
&_data_word(0x656e95e6, 0x7ee6ffaa, 0x08cfbc21, 0xe6e815ef);
&_data_word(0xd99be7ba, 0xce366f4a, 0xd4099fea, 0xd67cb029);
&_data_word(0xafb2a431, 0x31233f2a, 0x3094a5c6, 0xc066a235);
&_data_word(0x37bc4e74, 0xa6ca82fc, 0xb0d090e0, 0x15d8a733);
&_data_word(0x4a9804f1, 0xf7daec41, 0x0e50cd7f, 0x2ff69117);
&_data_word(0x8dd64d76, 0x4db0ef43, 0x544daacc, 0xdf0496e4);
&_data_word(0xe3b5d19e, 0x1b886a4c, 0xb81f2cc1, 0x7f516546);
&_data_word(0x04ea5e9d, 0x5d358c01, 0x737487fa, 0x2e410bfb);
&_data_word(0x5a1d67b3, 0x52d2db92, 0x335610e9, 0x1347d66d);
&_data_word(0x8c61d79a, 0x7a0ca137, 0x8e14f859, 0x893c13eb);
&_data_word(0xee27a9ce, 0x35c961b7, 0xede51ce1, 0x3cb1477a);
&_data_word(0x59dfd29c, 0x3f73f255, 0x79ce1418, 0xbf37c773);
&_data_word(0xeacdf753, 0x5baafd5f, 0x146f3ddf, 0x86db4478);
&_data_word(0x81f3afca, 0x3ec468b9, 0x2c342438, 0x5f40a3c2);
&_data_word(0x72c31d16, 0x0c25e2bc, 0x8b493c28, 0x41950dff);
&_data_word(0x7101a839, 0xdeb30c08, 0x9ce4b4d8, 0x90c15664);
&_data_word(0x6184cb7b, 0x70b632d5, 0x745c6c48, 0x4257b8d0);
#Td4:
&data_byte(0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38);
&data_byte(0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb);
&data_byte(0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87);
&data_byte(0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb);
&data_byte(0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d);
&data_byte(0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e);
&data_byte(0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2);
&data_byte(0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25);
&data_byte(0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16);
&data_byte(0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92);
&data_byte(0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda);
&data_byte(0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84);
&data_byte(0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a);
&data_byte(0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06);
&data_byte(0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02);
&data_byte(0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b);
&data_byte(0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea);
&data_byte(0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73);
&data_byte(0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85);
&data_byte(0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e);
&data_byte(0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89);
&data_byte(0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b);
&data_byte(0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20);
&data_byte(0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4);
&data_byte(0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31);
&data_byte(0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f);
&data_byte(0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d);
&data_byte(0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef);
&data_byte(0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0);
&data_byte(0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61);
&data_byte(0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26);
&data_byte(0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d);
&function_end_B("_x86_AES_decrypt");
# void AES_decrypt (const void *inp,void *out,const AES_KEY *key);
&public_label("AES_Td");
&function_begin("AES_decrypt");
&mov ($acc,&wparam(0)); # load inp
&mov ($key,&wparam(2)); # load key
&mov ($s0,"esp");
&sub ("esp",24);
&and ("esp",-64);
&add ("esp",4);
&mov (&DWP(16,"esp"),$s0);
&call (&label("pic_point")); # make it PIC!
&set_label("pic_point");
&blindpop("ebp");
&lea ("ebp",&DWP(&label("AES_Td")."-".&label("pic_point"),"ebp"));
# prefetch Td4
&lea ("ebp",&DWP(2048+128,"ebp"));
&mov ($s0,&DWP(0-128,"ebp"));
&mov ($s1,&DWP(32-128,"ebp"));
&mov ($s2,&DWP(64-128,"ebp"));
&mov ($s3,&DWP(96-128,"ebp"));
&mov ($s0,&DWP(128-128,"ebp"));
&mov ($s1,&DWP(160-128,"ebp"));
&mov ($s2,&DWP(192-128,"ebp"));
&mov ($s3,&DWP(224-128,"ebp"));
&lea ("ebp",&DWP(-2048-128,"ebp"));
&mov ($s0,&DWP(0,$acc)); # load input data
&mov ($s1,&DWP(4,$acc));
&mov ($s2,&DWP(8,$acc));
&mov ($s3,&DWP(12,$acc));
&call ("_x86_AES_decrypt");
&mov ("esp",&DWP(16,"esp"));
&mov ($acc,&wparam(1)); # load out
&mov (&DWP(0,$acc),$s0); # write output data
&mov (&DWP(4,$acc),$s1);
&mov (&DWP(8,$acc),$s2);
&mov (&DWP(12,$acc),$s3);
&function_end("AES_decrypt");
# void AES_cbc_encrypt (const void char *inp, unsigned char *out,
# size_t length, const AES_KEY *key,
# unsigned char *ivp,const int enc);
{
# stack frame layout
# -4(%esp) 0(%esp) return address
# 0(%esp) 4(%esp) tmp1
# 4(%esp) 8(%esp) tmp2
# 8(%esp) 12(%esp) key
# 12(%esp) 16(%esp) end of key schedule
my $_esp=&DWP(16,"esp"); #saved %esp
my $_inp=&DWP(20,"esp"); #copy of wparam(0)
my $_out=&DWP(24,"esp"); #copy of wparam(1)
my $_len=&DWP(28,"esp"); #copy of wparam(2)
my $_key=&DWP(32,"esp"); #copy of wparam(3)
my $_ivp=&DWP(36,"esp"); #copy of wparam(4)
my $_tmp=&DWP(40,"esp"); #volatile variable
my $ivec=&DWP(44,"esp"); #ivec[16]
my $aes_key=&DWP(60,"esp"); #copy of aes_key
my $mark=&DWP(60+240,"esp"); #copy of aes_key->rounds
&public_label("AES_Te");
&public_label("AES_Td");
&function_begin("AES_cbc_encrypt");
&mov ($s2 eq "ecx"? $s2 : "",&wparam(2)); # load len
&cmp ($s2,0);
&je (&label("enc_out"));
&call (&label("pic_point")); # make it PIC!
&set_label("pic_point");
&blindpop("ebp");
&pushf ();
&cld ();
&cmp (&wparam(5),0);
&je (&label("DECRYPT"));
&lea ("ebp",&DWP(&label("AES_Te")."-".&label("pic_point"),"ebp"));
# allocate aligned stack frame...
&lea ($key,&DWP(-64-244,"esp"));
&and ($key,-64);
# ... and make sure it doesn't alias with AES_Te modulo 4096
&mov ($s0,"ebp");
&lea ($s1,&DWP(2048,"ebp"));
&mov ($s3,$key);
&and ($s0,0xfff); # s = %ebp&0xfff
&and ($s1,0xfff); # e = (%ebp+2048)&0xfff
&and ($s3,0xfff); # p = %esp&0xfff
&cmp ($s3,$s1); # if (p>=e) %esp =- (p-e);
&jb (&label("te_break_out"));
&sub ($s3,$s1);
&sub ($key,$s3);
&jmp (&label("te_ok"));
&set_label("te_break_out"); # else %esp -= (p-s)&0xfff + framesz;
&sub ($s3,$s0);
&and ($s3,0xfff);
&add ($s3,64+256);
&sub ($key,$s3);
&align (4);
&set_label("te_ok");
&mov ($s0,&wparam(0)); # load inp
&mov ($s1,&wparam(1)); # load out
&mov ($s3,&wparam(3)); # load key
&mov ($acc,&wparam(4)); # load ivp
&exch ("esp",$key);
&add ("esp",4); # reserve for return address!
&mov ($_esp,$key); # save %esp
&mov ($_inp,$s0); # save copy of inp
&mov ($_out,$s1); # save copy of out
&mov ($_len,$s2); # save copy of len
&mov ($_key,$s3); # save copy of key
&mov ($_ivp,$acc); # save copy of ivp
&mov ($mark,0); # copy of aes_key->rounds = 0;
if ($compromise) {
&cmp ($s2,$compromise);
&jb (&label("skip_ecopy"));
}
# do we copy key schedule to stack?
&mov ($s1 eq "ebx" ? $s1 : "",$s3);
&mov ($s2 eq "ecx" ? $s2 : "",244/4);
&sub ($s1,"ebp");
&mov ("esi",$s3);
&and ($s1,0xfff);
&lea ("edi",$aes_key);
&cmp ($s1,2048);
&jb (&label("do_ecopy"));
&cmp ($s1,4096-244);
&jb (&label("skip_ecopy"));
&align (4);
&set_label("do_ecopy");
&mov ($_key,"edi");
&data_word(0xA5F3F689); # rep movsd
&set_label("skip_ecopy");
&mov ($acc,$s0);
&mov ($key,16);
&align (4);
&set_label("prefetch_te");
&mov ($s0,&DWP(0,"ebp"));
&mov ($s1,&DWP(32,"ebp"));
&mov ($s2,&DWP(64,"ebp"));
&mov ($s3,&DWP(96,"ebp"));
&lea ("ebp",&DWP(128,"ebp"));
&dec ($key);
&jnz (&label("prefetch_te"));
&sub ("ebp",2048);
&mov ($s2,$_len);
&mov ($key,$_ivp);
&test ($s2,0xFFFFFFF0);
&jz (&label("enc_tail")); # short input...
&mov ($s0,&DWP(0,$key)); # load iv
&mov ($s1,&DWP(4,$key));
&align (4);
&set_label("enc_loop");
&mov ($s2,&DWP(8,$key));
&mov ($s3,&DWP(12,$key));
&xor ($s0,&DWP(0,$acc)); # xor input data
&xor ($s1,&DWP(4,$acc));
&xor ($s2,&DWP(8,$acc));
&xor ($s3,&DWP(12,$acc));
&mov ($key,$_key); # load key
&call ("_x86_AES_encrypt");
&mov ($acc,$_inp); # load inp
&mov ($key,$_out); # load out
&mov (&DWP(0,$key),$s0); # save output data
&mov (&DWP(4,$key),$s1);
&mov (&DWP(8,$key),$s2);
&mov (&DWP(12,$key),$s3);
&mov ($s2,$_len); # load len
&lea ($acc,&DWP(16,$acc));
&mov ($_inp,$acc); # save inp
&lea ($s3,&DWP(16,$key));
&mov ($_out,$s3); # save out
&sub ($s2,16);
&test ($s2,0xFFFFFFF0);
&mov ($_len,$s2); # save len
&jnz (&label("enc_loop"));
&test ($s2,15);
&jnz (&label("enc_tail"));
&mov ($acc,$_ivp); # load ivp
&mov ($s2,&DWP(8,$key)); # restore last dwords
&mov ($s3,&DWP(12,$key));
&mov (&DWP(0,$acc),$s0); # save ivec
&mov (&DWP(4,$acc),$s1);
&mov (&DWP(8,$acc),$s2);
&mov (&DWP(12,$acc),$s3);
&cmp ($mark,0); # was the key schedule copied?
&mov ("edi",$_key);
&je (&label("skip_ezero"));
# zero copy of key schedule
&mov ("ecx",240/4);
&xor ("eax","eax");
&align (4);
&data_word(0xABF3F689); # rep stosd
&set_label("skip_ezero")
&mov ("esp",$_esp);
&popf ();
&set_label("enc_out");
&function_end_A();
&pushf (); # kludge, never executed
&align (4);
&set_label("enc_tail");
&push ($key eq "edi" ? $key : ""); # push ivp
&mov ($key,$_out); # load out
&mov ($s1,16);
&sub ($s1,$s2);
&cmp ($key,$acc); # compare with inp
&je (&label("enc_in_place"));
&align (4);
&data_word(0xA4F3F689); # rep movsb # copy input
&jmp (&label("enc_skip_in_place"));
&set_label("enc_in_place");
&lea ($key,&DWP(0,$key,$s2));
&set_label("enc_skip_in_place");
&mov ($s2,$s1);
&xor ($s0,$s0);
&align (4);
&data_word(0xAAF3F689); # rep stosb # zero tail
&pop ($key); # pop ivp
&mov ($acc,$_out); # output as input
&mov ($s0,&DWP(0,$key));
&mov ($s1,&DWP(4,$key));
&mov ($_len,16); # len=16
&jmp (&label("enc_loop")); # one more spin...
#----------------------------- DECRYPT -----------------------------#
&align (4);
&set_label("DECRYPT");
&lea ("ebp",&DWP(&label("AES_Td")."-".&label("pic_point"),"ebp"));
# allocate aligned stack frame...
&lea ($key,&DWP(-64-244,"esp"));
&and ($key,-64);
# ... and make sure it doesn't alias with AES_Td modulo 4096
&mov ($s0,"ebp");
&lea ($s1,&DWP(2048+256,"ebp"));
&mov ($s3,$key);
&and ($s0,0xfff); # s = %ebp&0xfff
&and ($s1,0xfff); # e = (%ebp+2048+256)&0xfff
&and ($s3,0xfff); # p = %esp&0xfff
&cmp ($s3,$s1); # if (p>=e) %esp =- (p-e);
&jb (&label("td_break_out"));
&sub ($s3,$s1);
&sub ($key,$s3);
&jmp (&label("td_ok"));
&set_label("td_break_out"); # else %esp -= (p-s)&0xfff + framesz;
&sub ($s3,$s0);
&and ($s3,0xfff);
&add ($s3,64+256);
&sub ($key,$s3);
&align (4);
&set_label("td_ok");
&mov ($s0,&wparam(0)); # load inp
&mov ($s1,&wparam(1)); # load out
&mov ($s3,&wparam(3)); # load key
&mov ($acc,&wparam(4)); # load ivp
&exch ("esp",$key);
&add ("esp",4); # reserve for return address!
&mov ($_esp,$key); # save %esp
&mov ($_inp,$s0); # save copy of inp
&mov ($_out,$s1); # save copy of out
&mov ($_len,$s2); # save copy of len
&mov ($_key,$s3); # save copy of key
&mov ($_ivp,$acc); # save copy of ivp
&mov ($mark,0); # copy of aes_key->rounds = 0;
if ($compromise) {
&cmp ($s2,$compromise);
&jb (&label("skip_dcopy"));
}
# do we copy key schedule to stack?
&mov ($s1 eq "ebx" ? $s1 : "",$s3);
&mov ($s2 eq "ecx" ? $s2 : "",244/4);
&sub ($s1,"ebp");
&mov ("esi",$s3);
&and ($s1,0xfff);
&lea ("edi",$aes_key);
&cmp ($s1,2048+256);
&jb (&label("do_dcopy"));
&cmp ($s1,4096-244);
&jb (&label("skip_dcopy"));
&align (4);
&set_label("do_dcopy");
&mov ($_key,"edi");
&data_word(0xA5F3F689); # rep movsd
&set_label("skip_dcopy");
&mov ($acc,$s0);
&mov ($key,18);
&align (4);
&set_label("prefetch_td");
&mov ($s0,&DWP(0,"ebp"));
&mov ($s1,&DWP(32,"ebp"));
&mov ($s2,&DWP(64,"ebp"));
&mov ($s3,&DWP(96,"ebp"));
&lea ("ebp",&DWP(128,"ebp"));
&dec ($key);
&jnz (&label("prefetch_td"));
&sub ("ebp",2048+256);
&cmp ($acc,$_out);
&je (&label("dec_in_place")); # in-place processing...
&mov ($key,$_ivp); # load ivp
&mov ($_tmp,$key);
&align (4);
&set_label("dec_loop");
&mov ($s0,&DWP(0,$acc)); # read input
&mov ($s1,&DWP(4,$acc));
&mov ($s2,&DWP(8,$acc));
&mov ($s3,&DWP(12,$acc));
&mov ($key,$_key); # load key
&call ("_x86_AES_decrypt");
&mov ($key,$_tmp); # load ivp
&mov ($acc,$_len); # load len
&xor ($s0,&DWP(0,$key)); # xor iv
&xor ($s1,&DWP(4,$key));
&xor ($s2,&DWP(8,$key));
&xor ($s3,&DWP(12,$key));
&sub ($acc,16);
&jc (&label("dec_partial"));
&mov ($_len,$acc); # save len
&mov ($acc,$_inp); # load inp
&mov ($key,$_out); # load out
&mov (&DWP(0,$key),$s0); # write output
&mov (&DWP(4,$key),$s1);
&mov (&DWP(8,$key),$s2);
&mov (&DWP(12,$key),$s3);
&mov ($_tmp,$acc); # save ivp
&lea ($acc,&DWP(16,$acc));
&mov ($_inp,$acc); # save inp
&lea ($key,&DWP(16,$key));
&mov ($_out,$key); # save out
&jnz (&label("dec_loop"));
&mov ($key,$_tmp); # load temp ivp
&set_label("dec_end");
&mov ($acc,$_ivp); # load user ivp
&mov ($s0,&DWP(0,$key)); # load iv
&mov ($s1,&DWP(4,$key));
&mov ($s2,&DWP(8,$key));
&mov ($s3,&DWP(12,$key));
&mov (&DWP(0,$acc),$s0); # copy back to user
&mov (&DWP(4,$acc),$s1);
&mov (&DWP(8,$acc),$s2);
&mov (&DWP(12,$acc),$s3);
&jmp (&label("dec_out"));
&align (4);
&set_label("dec_partial");
&lea ($key,$ivec);
&mov (&DWP(0,$key),$s0); # dump output to stack
&mov (&DWP(4,$key),$s1);
&mov (&DWP(8,$key),$s2);
&mov (&DWP(12,$key),$s3);
&lea ($s2 eq "ecx" ? $s2 : "",&DWP(16,$acc));
&mov ($acc eq "esi" ? $acc : "",$key);
&mov ($key eq "edi" ? $key : "",$_out); # load out
&data_word(0xA4F3F689); # rep movsb # copy output
&mov ($key,$_inp); # use inp as temp ivp
&jmp (&label("dec_end"));
&align (4);
&set_label("dec_in_place");
&set_label("dec_in_place_loop");
&lea ($key,$ivec);
&mov ($s0,&DWP(0,$acc)); # read input
&mov ($s1,&DWP(4,$acc));
&mov ($s2,&DWP(8,$acc));
&mov ($s3,&DWP(12,$acc));
&mov (&DWP(0,$key),$s0); # copy to temp
&mov (&DWP(4,$key),$s1);
&mov (&DWP(8,$key),$s2);
&mov (&DWP(12,$key),$s3);
&mov ($key,$_key); # load key
&call ("_x86_AES_decrypt");
&mov ($key,$_ivp); # load ivp
&mov ($acc,$_out); # load out
&xor ($s0,&DWP(0,$key)); # xor iv
&xor ($s1,&DWP(4,$key));
&xor ($s2,&DWP(8,$key));
&xor ($s3,&DWP(12,$key));
&mov (&DWP(0,$acc),$s0); # write output
&mov (&DWP(4,$acc),$s1);
&mov (&DWP(8,$acc),$s2);
&mov (&DWP(12,$acc),$s3);
&lea ($acc,&DWP(16,$acc));
&mov ($_out,$acc); # save out
&lea ($acc,$ivec);
&mov ($s0,&DWP(0,$acc)); # read temp
&mov ($s1,&DWP(4,$acc));
&mov ($s2,&DWP(8,$acc));
&mov ($s3,&DWP(12,$acc));
&mov (&DWP(0,$key),$s0); # copy iv
&mov (&DWP(4,$key),$s1);
&mov (&DWP(8,$key),$s2);
&mov (&DWP(12,$key),$s3);
&mov ($acc,$_inp); # load inp
&lea ($acc,&DWP(16,$acc));
&mov ($_inp,$acc); # save inp
&mov ($s2,$_len); # load len
&sub ($s2,16);
&jc (&label("dec_in_place_partial"));
&mov ($_len,$s2); # save len
&jnz (&label("dec_in_place_loop"));
&jmp (&label("dec_out"));
&align (4);
&set_label("dec_in_place_partial");
# one can argue if this is actually required...
&mov ($key eq "edi" ? $key : "",$_out);
&lea ($acc eq "esi" ? $acc : "",$ivec);
&lea ($key,&DWP(0,$key,$s2));
&lea ($acc,&DWP(16,$acc,$s2));
&neg ($s2 eq "ecx" ? $s2 : "");
&data_word(0xA4F3F689); # rep movsb # restore tail
&align (4);
&set_label("dec_out");
&cmp ($mark,0); # was the key schedule copied?
&mov ("edi",$_key);
&je (&label("skip_dzero"));
# zero copy of key schedule
&mov ("ecx",240/4);
&xor ("eax","eax");
&align (4);
&data_word(0xABF3F689); # rep stosd
&set_label("skip_dzero")
&mov ("esp",$_esp);
&popf ();
&function_end("AES_cbc_encrypt");
}
#------------------------------------------------------------------#
sub enckey()
{
&movz ("esi",&LB("edx")); # rk[i]>>0
&mov ("ebx",&DWP(2,"ebp","esi",8));
&movz ("esi",&HB("edx")); # rk[i]>>8
&and ("ebx",0xFF000000);
&xor ("eax","ebx");
&mov ("ebx",&DWP(2,"ebp","esi",8));
&shr ("edx",16);
&and ("ebx",0x000000FF);
&movz ("esi",&LB("edx")); # rk[i]>>16
&xor ("eax","ebx");
&mov ("ebx",&DWP(0,"ebp","esi",8));
&movz ("esi",&HB("edx")); # rk[i]>>24
&and ("ebx",0x0000FF00);
&xor ("eax","ebx");
&mov ("ebx",&DWP(0,"ebp","esi",8));
&and ("ebx",0x00FF0000);
&xor ("eax","ebx");
&xor ("eax",&DWP(2048,"ebp","ecx",4)); # rcon
}
# int AES_set_encrypt_key(const unsigned char *userKey, const int bits,
# AES_KEY *key)
&public_label("AES_Te");
&function_begin("AES_set_encrypt_key");
&mov ("esi",&wparam(0)); # user supplied key
&mov ("edi",&wparam(2)); # private key schedule
&test ("esi",-1);
&jz (&label("badpointer"));
&test ("edi",-1);
&jz (&label("badpointer"));
&call (&label("pic_point"));
&set_label("pic_point");
&blindpop("ebp");
&lea ("ebp",&DWP(&label("AES_Te")."-".&label("pic_point"),"ebp"));
&mov ("ecx",&wparam(1)); # number of bits in key
&cmp ("ecx",128);
&je (&label("10rounds"));
&cmp ("ecx",192);
&je (&label("12rounds"));
&cmp ("ecx",256);
&je (&label("14rounds"));
&mov ("eax",-2); # invalid number of bits
&jmp (&label("exit"));
&set_label("10rounds");
&mov ("eax",&DWP(0,"esi")); # copy first 4 dwords
&mov ("ebx",&DWP(4,"esi"));
&mov ("ecx",&DWP(8,"esi"));
&mov ("edx",&DWP(12,"esi"));
&mov (&DWP(0,"edi"),"eax");
&mov (&DWP(4,"edi"),"ebx");
&mov (&DWP(8,"edi"),"ecx");
&mov (&DWP(12,"edi"),"edx");
&xor ("ecx","ecx");
&jmp (&label("10shortcut"));
&align (4);
&set_label("10loop");
&mov ("eax",&DWP(0,"edi")); # rk[0]
&mov ("edx",&DWP(12,"edi")); # rk[3]
&set_label("10shortcut");
&enckey ();
&mov (&DWP(16,"edi"),"eax"); # rk[4]
&xor ("eax",&DWP(4,"edi"));
&mov (&DWP(20,"edi"),"eax"); # rk[5]
&xor ("eax",&DWP(8,"edi"));
&mov (&DWP(24,"edi"),"eax"); # rk[6]
&xor ("eax",&DWP(12,"edi"));
&mov (&DWP(28,"edi"),"eax"); # rk[7]
&inc ("ecx");
&add ("edi",16);
&cmp ("ecx",10);
&jl (&label("10loop"));
&mov (&DWP(80,"edi"),10); # setup number of rounds
&xor ("eax","eax");
&jmp (&label("exit"));
&set_label("12rounds");
&mov ("eax",&DWP(0,"esi")); # copy first 6 dwords
&mov ("ebx",&DWP(4,"esi"));
&mov ("ecx",&DWP(8,"esi"));
&mov ("edx",&DWP(12,"esi"));
&mov (&DWP(0,"edi"),"eax");
&mov (&DWP(4,"edi"),"ebx");
&mov (&DWP(8,"edi"),"ecx");
&mov (&DWP(12,"edi"),"edx");
&mov ("ecx",&DWP(16,"esi"));
&mov ("edx",&DWP(20,"esi"));
&mov (&DWP(16,"edi"),"ecx");
&mov (&DWP(20,"edi"),"edx");
&xor ("ecx","ecx");
&jmp (&label("12shortcut"));
&align (4);
&set_label("12loop");
&mov ("eax",&DWP(0,"edi")); # rk[0]
&mov ("edx",&DWP(20,"edi")); # rk[5]
&set_label("12shortcut");
&enckey ();
&mov (&DWP(24,"edi"),"eax"); # rk[6]
&xor ("eax",&DWP(4,"edi"));
&mov (&DWP(28,"edi"),"eax"); # rk[7]
&xor ("eax",&DWP(8,"edi"));
&mov (&DWP(32,"edi"),"eax"); # rk[8]
&xor ("eax",&DWP(12,"edi"));
&mov (&DWP(36,"edi"),"eax"); # rk[9]
&cmp ("ecx",7);
&je (&label("12break"));
&inc ("ecx");
&xor ("eax",&DWP(16,"edi"));
&mov (&DWP(40,"edi"),"eax"); # rk[10]
&xor ("eax",&DWP(20,"edi"));
&mov (&DWP(44,"edi"),"eax"); # rk[11]
&add ("edi",24);
&jmp (&label("12loop"));
&set_label("12break");
&mov (&DWP(72,"edi"),12); # setup number of rounds
&xor ("eax","eax");
&jmp (&label("exit"));
&set_label("14rounds");
&mov ("eax",&DWP(0,"esi")); # copy first 8 dwords
&mov ("ebx",&DWP(4,"esi"));
&mov ("ecx",&DWP(8,"esi"));
&mov ("edx",&DWP(12,"esi"));
&mov (&DWP(0,"edi"),"eax");
&mov (&DWP(4,"edi"),"ebx");
&mov (&DWP(8,"edi"),"ecx");
&mov (&DWP(12,"edi"),"edx");
&mov ("eax",&DWP(16,"esi"));
&mov ("ebx",&DWP(20,"esi"));
&mov ("ecx",&DWP(24,"esi"));
&mov ("edx",&DWP(28,"esi"));
&mov (&DWP(16,"edi"),"eax");
&mov (&DWP(20,"edi"),"ebx");
&mov (&DWP(24,"edi"),"ecx");
&mov (&DWP(28,"edi"),"edx");
&xor ("ecx","ecx");
&jmp (&label("14shortcut"));
&align (4);
&set_label("14loop");
&mov ("edx",&DWP(28,"edi")); # rk[7]
&set_label("14shortcut");
&mov ("eax",&DWP(0,"edi")); # rk[0]
&enckey ();
&mov (&DWP(32,"edi"),"eax"); # rk[8]
&xor ("eax",&DWP(4,"edi"));
&mov (&DWP(36,"edi"),"eax"); # rk[9]
&xor ("eax",&DWP(8,"edi"));
&mov (&DWP(40,"edi"),"eax"); # rk[10]
&xor ("eax",&DWP(12,"edi"));
&mov (&DWP(44,"edi"),"eax"); # rk[11]
&cmp ("ecx",6);
&je (&label("14break"));
&inc ("ecx");
&mov ("edx","eax");
&mov ("eax",&DWP(16,"edi")); # rk[4]
&movz ("esi",&LB("edx")); # rk[11]>>0
&mov ("ebx",&DWP(2,"ebp","esi",8));
&movz ("esi",&HB("edx")); # rk[11]>>8
&and ("ebx",0x000000FF);
&xor ("eax","ebx");
&mov ("ebx",&DWP(0,"ebp","esi",8));
&shr ("edx",16);
&and ("ebx",0x0000FF00);
&movz ("esi",&LB("edx")); # rk[11]>>16
&xor ("eax","ebx");
&mov ("ebx",&DWP(0,"ebp","esi",8));
&movz ("esi",&HB("edx")); # rk[11]>>24
&and ("ebx",0x00FF0000);
&xor ("eax","ebx");
&mov ("ebx",&DWP(2,"ebp","esi",8));
&and ("ebx",0xFF000000);
&xor ("eax","ebx");
&mov (&DWP(48,"edi"),"eax"); # rk[12]
&xor ("eax",&DWP(20,"edi"));
&mov (&DWP(52,"edi"),"eax"); # rk[13]
&xor ("eax",&DWP(24,"edi"));
&mov (&DWP(56,"edi"),"eax"); # rk[14]
&xor ("eax",&DWP(28,"edi"));
&mov (&DWP(60,"edi"),"eax"); # rk[15]
&add ("edi",32);
&jmp (&label("14loop"));
&set_label("14break");
&mov (&DWP(48,"edi"),14); # setup number of rounds
&xor ("eax","eax");
&jmp (&label("exit"));
&set_label("badpointer");
&mov ("eax",-1);
&set_label("exit");
&function_end("AES_set_encrypt_key");
sub deckey()
{ my ($i,$ptr,$te,$td) = @_;
&mov ("eax",&DWP($i,$ptr));
&mov ("edx","eax");
&movz ("ebx",&HB("eax"));
&shr ("edx",16);
&and ("eax",0xFF);
&movz ("eax",&BP(2,$te,"eax",8));
&movz ("ebx",&BP(2,$te,"ebx",8));
&mov ("eax",&DWP(0,$td,"eax",8));
&xor ("eax",&DWP(3,$td,"ebx",8));
&movz ("ebx",&HB("edx"));
&and ("edx",0xFF);
&movz ("edx",&BP(2,$te,"edx",8));
&movz ("ebx",&BP(2,$te,"ebx",8));
&xor ("eax",&DWP(2,$td,"edx",8));
&xor ("eax",&DWP(1,$td,"ebx",8));
&mov (&DWP($i,$ptr),"eax");
}
# int AES_set_decrypt_key(const unsigned char *userKey, const int bits,
# AES_KEY *key)
&public_label("AES_Td");
&public_label("AES_Te");
&function_begin_B("AES_set_decrypt_key");
&mov ("eax",&wparam(0));
&mov ("ecx",&wparam(1));
&mov ("edx",&wparam(2));
&sub ("esp",12);
&mov (&DWP(0,"esp"),"eax");
&mov (&DWP(4,"esp"),"ecx");
&mov (&DWP(8,"esp"),"edx");
&call ("AES_set_encrypt_key");
&add ("esp",12);
&cmp ("eax",0);
&je (&label("proceed"));
&ret ();
&set_label("proceed");
&push ("ebp");
&push ("ebx");
&push ("esi");
&push ("edi");
&mov ("esi",&wparam(2));
&mov ("ecx",&DWP(240,"esi")); # pull number of rounds
&lea ("ecx",&DWP(0,"","ecx",4));
&lea ("edi",&DWP(0,"esi","ecx",4)); # pointer to last chunk
&align (4);
&set_label("invert"); # invert order of chunks
&mov ("eax",&DWP(0,"esi"));
&mov ("ebx",&DWP(4,"esi"));
&mov ("ecx",&DWP(0,"edi"));
&mov ("edx",&DWP(4,"edi"));
&mov (&DWP(0,"edi"),"eax");
&mov (&DWP(4,"edi"),"ebx");
&mov (&DWP(0,"esi"),"ecx");
&mov (&DWP(4,"esi"),"edx");
&mov ("eax",&DWP(8,"esi"));
&mov ("ebx",&DWP(12,"esi"));
&mov ("ecx",&DWP(8,"edi"));
&mov ("edx",&DWP(12,"edi"));
&mov (&DWP(8,"edi"),"eax");
&mov (&DWP(12,"edi"),"ebx");
&mov (&DWP(8,"esi"),"ecx");
&mov (&DWP(12,"esi"),"edx");
&add ("esi",16);
&sub ("edi",16);
&cmp ("esi","edi");
&jne (&label("invert"));
&call (&label("pic_point"));
&set_label("pic_point");
blindpop("ebp");
&lea ("edi",&DWP(&label("AES_Td")."-".&label("pic_point"),"ebp"));
&lea ("ebp",&DWP(&label("AES_Te")."-".&label("pic_point"),"ebp"));
&mov ("esi",&wparam(2));
&mov ("ecx",&DWP(240,"esi")); # pull number of rounds
&dec ("ecx");
&align (4);
&set_label("permute"); # permute the key schedule
&add ("esi",16);
&deckey (0,"esi","ebp","edi");
&deckey (4,"esi","ebp","edi");
&deckey (8,"esi","ebp","edi");
&deckey (12,"esi","ebp","edi");
&dec ("ecx");
&jnz (&label("permute"));
&xor ("eax","eax"); # return success
&function_end("AES_set_decrypt_key");
&asm_finish();