#! /usr/bin/env perl
# Copyright 2011-2020 The OpenSSL Project Authors. All Rights Reserved.
#
# Licensed under the OpenSSL license (the "License"). You may not use
# this file except in compliance with the License. You can obtain a copy
# in the file LICENSE in the source distribution or at
# https://www.openssl.org/source/license.html
#
# ====================================================================
# Written by Andy Polyakov <appro@openssl.org> for the OpenSSL
# project. The module is, however, dual licensed under OpenSSL and
# CRYPTOGAMS licenses depending on where you obtain it. For further
# details see http://www.openssl.org/~appro/cryptogams/.
# ====================================================================
# June 2011
#
# This is RC4+MD5 "stitch" implementation. The idea, as spelled in
# http://download.intel.com/design/intarch/papers/323686.pdf, is that
# since both algorithms exhibit instruction-level parallelism, ILP,
# below theoretical maximum, interleaving them would allow to utilize
# processor resources better and achieve better performance. RC4
# instruction sequence is virtually identical to rc4-x86_64.pl, which
# is heavily based on submission by Maxim Perminov, Maxim Locktyukhin
# and Jim Guilford of Intel. MD5 is fresh implementation aiming to
# minimize register usage, which was used as "main thread" with RC4
# weaved into it, one RC4 round per one MD5 round. In addition to the
# stiched subroutine the script can generate standalone replacement
# md5_block_asm_data_order and RC4. Below are performance numbers in
# cycles per processed byte, less is better, for these the standalone
# subroutines, sum of them, and stitched one:
#
# RC4 MD5 RC4+MD5 stitch gain
# Opteron 6.5(*) 5.4 11.9 7.0 +70%(*)
# Core2 6.5 5.8 12.3 7.7 +60%
# Westmere 4.3 5.2 9.5 7.0 +36%
# Sandy Bridge 4.2 5.5 9.7 6.8 +43%
# Ivy Bridge 4.1 5.2 9.3 6.0 +54%
# Haswell 4.0 5.0 9.0 5.7 +60%
# Skylake 6.3(**) 5.0 11.3 5.3 +110%
# Atom 9.3 6.5 15.8 11.1 +42%
# VIA Nano 6.3 5.4 11.7 8.6 +37%
# Bulldozer 4.5 5.4 9.9 7.7 +29%
#
# (*) rc4-x86_64.pl delivers 5.3 on Opteron, so real improvement
# is +53%...
# (**) unidentified anomaly;
my ($rc4,$md5)=(1,1); # what to generate?
my $D="#" if (!$md5); # if set to "#", MD5 is stitched into RC4(),
# but its result is discarded. Idea here is
# to be able to use 'openssl speed rc4' for
# benchmarking the stitched subroutine...
my $flavour = shift;
my $output = shift;
if ($flavour =~ /\./) { $output = $flavour; undef $flavour; }
my $win64=0; $win64=1 if ($flavour =~ /[nm]asm|mingw64/ || $output =~ /\.asm$/);
$0 =~ m/(.*[\/\\])[^\/\\]+$/; my $dir=$1; my $xlate;
( $xlate="${dir}x86_64-xlate.pl" and -f $xlate ) or
( $xlate="${dir}../../perlasm/x86_64-xlate.pl" and -f $xlate) or
die "can't locate x86_64-xlate.pl";
open OUT,"| \"$^X\" \"$xlate\" $flavour \"$output\"";
*STDOUT=*OUT;
my ($dat,$in0,$out,$ctx,$inp,$len, $func,$nargs);
if ($rc4 && !$md5) {
($dat,$len,$in0,$out) = ("%rdi","%rsi","%rdx","%rcx");
$func="RC4"; $nargs=4;
} elsif ($md5 && !$rc4) {
($ctx,$inp,$len) = ("%rdi","%rsi","%rdx");
$func="md5_block_asm_data_order"; $nargs=3;
} else {
($dat,$in0,$out,$ctx,$inp,$len) = ("%rdi","%rsi","%rdx","%rcx","%r8","%r9");
$func="rc4_md5_enc"; $nargs=6;
# void rc4_md5_enc(
# RC4_KEY *key, #
# const void *in0, # RC4 input
# void *out, # RC4 output
# MD5_CTX *ctx, #
# const void *inp, # MD5 input
# size_t len); # number of 64-byte blocks
}
my @K=( 0xd76aa478,0xe8c7b756,0x242070db,0xc1bdceee,
0xf57c0faf,0x4787c62a,0xa8304613,0xfd469501,
0x698098d8,0x8b44f7af,0xffff5bb1,0x895cd7be,
0x6b901122,0xfd987193,0xa679438e,0x49b40821,
0xf61e2562,0xc040b340,0x265e5a51,0xe9b6c7aa,
0xd62f105d,0x02441453,0xd8a1e681,0xe7d3fbc8,
0x21e1cde6,0xc33707d6,0xf4d50d87,0x455a14ed,
0xa9e3e905,0xfcefa3f8,0x676f02d9,0x8d2a4c8a,
0xfffa3942,0x8771f681,0x6d9d6122,0xfde5380c,
0xa4beea44,0x4bdecfa9,0xf6bb4b60,0xbebfbc70,
0x289b7ec6,0xeaa127fa,0xd4ef3085,0x04881d05,
0xd9d4d039,0xe6db99e5,0x1fa27cf8,0xc4ac5665,
0xf4292244,0x432aff97,0xab9423a7,0xfc93a039,
0x655b59c3,0x8f0ccc92,0xffeff47d,0x85845dd1,
0x6fa87e4f,0xfe2ce6e0,0xa3014314,0x4e0811a1,
0xf7537e82,0xbd3af235,0x2ad7d2bb,0xeb86d391 );
my @V=("%r8d","%r9d","%r10d","%r11d"); # MD5 registers
my $tmp="%r12d";
my @XX=("%rbp","%rsi"); # RC4 registers
my @TX=("%rax","%rbx");
my $YY="%rcx";
my $TY="%rdx";
my $MOD=32; # 16, 32 or 64
$code.=<<___;
.text
.align 16
.globl $func
.type $func,\@function,$nargs
$func:
.cfi_startproc
cmp \$0,$len
je .Labort
push %rbx
.cfi_push %rbx
push %rbp
.cfi_push %rbp
push %r12
.cfi_push %r12
push %r13
.cfi_push %r13
push %r14
.cfi_push %r14
push %r15
.cfi_push %r15
sub \$40,%rsp
.cfi_adjust_cfa_offset 40
.Lbody:
___
if ($rc4) {
$code.=<<___;
$D#md5# mov $ctx,%r11 # reassign arguments
mov $len,%r12
mov $in0,%r13
mov $out,%r14
$D#md5# mov $inp,%r15
___
$ctx="%r11" if ($md5); # reassign arguments
$len="%r12";
$in0="%r13";
$out="%r14";
$inp="%r15" if ($md5);
$inp=$in0 if (!$md5);
$code.=<<___;
xor $XX[0],$XX[0]
xor $YY,$YY
lea 8($dat),$dat
mov -8($dat),$XX[0]#b
mov -4($dat),$YY#b
inc $XX[0]#b
sub $in0,$out
movl ($dat,$XX[0],4),$TX[0]#d
___
$code.=<<___ if (!$md5);
xor $TX[1],$TX[1]
test \$-128,$len
jz .Loop1
sub $XX[0],$TX[1]
and \$`$MOD-1`,$TX[1]
jz .Loop${MOD}_is_hot
sub $TX[1],$len
.Loop${MOD}_warmup:
add $TX[0]#b,$YY#b
movl ($dat,$YY,4),$TY#d
movl $TX[0]#d,($dat,$YY,4)
movl $TY#d,($dat,$XX[0],4)
add $TY#b,$TX[0]#b
inc $XX[0]#b
movl ($dat,$TX[0],4),$TY#d
movl ($dat,$XX[0],4),$TX[0]#d
xorb ($in0),$TY#b
movb $TY#b,($out,$in0)
lea 1($in0),$in0
dec $TX[1]
jnz .Loop${MOD}_warmup
mov $YY,$TX[1]
xor $YY,$YY
mov $TX[1]#b,$YY#b
.Loop${MOD}_is_hot:
mov $len,32(%rsp) # save original $len
shr \$6,$len # number of 64-byte blocks
___
if ($D && !$md5) { # stitch in dummy MD5
$md5=1;
$ctx="%r11";
$inp="%r15";
$code.=<<___;
mov %rsp,$ctx
mov $in0,$inp
___
}
}
$code.=<<___;
#rc4# add $TX[0]#b,$YY#b
#rc4# lea ($dat,$XX[0],4),$XX[1]
shl \$6,$len
add $inp,$len # pointer to the end of input
mov $len,16(%rsp)
#md5# mov $ctx,24(%rsp) # save pointer to MD5_CTX
#md5# mov 0*4($ctx),$V[0] # load current hash value from MD5_CTX
#md5# mov 1*4($ctx),$V[1]
#md5# mov 2*4($ctx),$V[2]
#md5# mov 3*4($ctx),$V[3]
jmp .Loop
.align 16
.Loop:
#md5# mov $V[0],0*4(%rsp) # put aside current hash value
#md5# mov $V[1],1*4(%rsp)
#md5# mov $V[2],2*4(%rsp)
#md5# mov $V[3],$tmp # forward reference
#md5# mov $V[3],3*4(%rsp)
___
sub R0 {
my ($i,$a,$b,$c,$d)=@_;
my @rot0=(7,12,17,22);
my $j=$i%16;
my $k=$i%$MOD;
my $xmm="%xmm".($j&1);
$code.=" movdqu ($in0),%xmm2\n" if ($rc4 && $j==15);
$code.=" add \$$MOD,$XX[0]#b\n" if ($rc4 && $j==15 && $k==$MOD-1);
$code.=" pxor $xmm,$xmm\n" if ($rc4 && $j<=1);
$code.=<<___;
#rc4# movl ($dat,$YY,4),$TY#d
#md5# xor $c,$tmp
#rc4# movl $TX[0]#d,($dat,$YY,4)
#md5# and $b,$tmp
#md5# add 4*`$j`($inp),$a
#rc4# add $TY#b,$TX[0]#b
#rc4# movl `4*(($k+1)%$MOD)`(`$k==$MOD-1?"$dat,$XX[0],4":"$XX[1]"`),$TX[1]#d
#md5# add \$$K[$i],$a
#md5# xor $d,$tmp
#rc4# movz $TX[0]#b,$TX[0]#d
#rc4# movl $TY#d,4*$k($XX[1])
#md5# add $tmp,$a
#rc4# add $TX[1]#b,$YY#b
#md5# rol \$$rot0[$j%4],$a
#md5# mov `$j==15?"$b":"$c"`,$tmp # forward reference
#rc4# pinsrw \$`($j>>1)&7`,($dat,$TX[0],4),$xmm\n
#md5# add $b,$a
___
$code.=<<___ if ($rc4 && $j==15 && $k==$MOD-1);
mov $YY,$XX[1]
xor $YY,$YY # keyword to partial register
mov $XX[1]#b,$YY#b
lea ($dat,$XX[0],4),$XX[1]
___
$code.=<<___ if ($rc4 && $j==15);
psllq \$8,%xmm1
pxor %xmm0,%xmm2
pxor %xmm1,%xmm2
___
}
sub R1 {
my ($i,$a,$b,$c,$d)=@_;
my @rot1=(5,9,14,20);
my $j=$i%16;
my $k=$i%$MOD;
my $xmm="%xmm".($j&1);
$code.=" movdqu 16($in0),%xmm3\n" if ($rc4 && $j==15);
$code.=" add \$$MOD,$XX[0]#b\n" if ($rc4 && $j==15 && $k==$MOD-1);
$code.=" pxor $xmm,$xmm\n" if ($rc4 && $j<=1);
$code.=<<___;
#rc4# movl ($dat,$YY,4),$TY#d
#md5# xor $b,$tmp
#rc4# movl $TX[0]#d,($dat,$YY,4)
#md5# and $d,$tmp
#md5# add 4*`((1+5*$j)%16)`($inp),$a
#rc4# add $TY#b,$TX[0]#b
#rc4# movl `4*(($k+1)%$MOD)`(`$k==$MOD-1?"$dat,$XX[0],4":"$XX[1]"`),$TX[1]#d
#md5# add \$$K[$i],$a
#md5# xor $c,$tmp
#rc4# movz $TX[0]#b,$TX[0]#d
#rc4# movl $TY#d,4*$k($XX[1])
#md5# add $tmp,$a
#rc4# add $TX[1]#b,$YY#b
#md5# rol \$$rot1[$j%4],$a
#md5# mov `$j==15?"$c":"$b"`,$tmp # forward reference
#rc4# pinsrw \$`($j>>1)&7`,($dat,$TX[0],4),$xmm\n
#md5# add $b,$a
___
$code.=<<___ if ($rc4 && $j==15 && $k==$MOD-1);
mov $YY,$XX[1]
xor $YY,$YY # keyword to partial register
mov $XX[1]#b,$YY#b
lea ($dat,$XX[0],4),$XX[1]
___
$code.=<<___ if ($rc4 && $j==15);
psllq \$8,%xmm1
pxor %xmm0,%xmm3
pxor %xmm1,%xmm3
___
}
sub R2 {
my ($i,$a,$b,$c,$d)=@_;
my @rot2=(4,11,16,23);
my $j=$i%16;
my $k=$i%$MOD;
my $xmm="%xmm".($j&1);
$code.=" movdqu 32($in0),%xmm4\n" if ($rc4 && $j==15);
$code.=" add \$$MOD,$XX[0]#b\n" if ($rc4 && $j==15 && $k==$MOD-1);
$code.=" pxor $xmm,$xmm\n" if ($rc4 && $j<=1);
$code.=<<___;
#rc4# movl ($dat,$YY,4),$TY#d
#md5# xor $c,$tmp
#rc4# movl $TX[0]#d,($dat,$YY,4)
#md5# xor $b,$tmp
#md5# add 4*`((5+3*$j)%16)`($inp),$a
#rc4# add $TY#b,$TX[0]#b
#rc4# movl `4*(($k+1)%$MOD)`(`$k==$MOD-1?"$dat,$XX[0],4":"$XX[1]"`),$TX[1]#d
#md5# add \$$K[$i],$a
#rc4# movz $TX[0]#b,$TX[0]#d
#md5# add $tmp,$a
#rc4# movl $TY#d,4*$k($XX[1])
#rc4# add $TX[1]#b,$YY#b
#md5# rol \$$rot2[$j%4],$a
#md5# mov `$j==15?"\\\$-1":"$c"`,$tmp # forward reference
#rc4# pinsrw \$`($j>>1)&7`,($dat,$TX[0],4),$xmm\n
#md5# add $b,$a
___
$code.=<<___ if ($rc4 && $j==15 && $k==$MOD-1);
mov $YY,$XX[1]
xor $YY,$YY # keyword to partial register
mov $XX[1]#b,$YY#b
lea ($dat,$XX[0],4),$XX[1]
___
$code.=<<___ if ($rc4 && $j==15);
psllq \$8,%xmm1
pxor %xmm0,%xmm4
pxor %xmm1,%xmm4
___
}
sub R3 {
my ($i,$a,$b,$c,$d)=@_;
my @rot3=(6,10,15,21);
my $j=$i%16;
my $k=$i%$MOD;
my $xmm="%xmm".($j&1);
$code.=" movdqu 48($in0),%xmm5\n" if ($rc4 && $j==15);
$code.=" add \$$MOD,$XX[0]#b\n" if ($rc4 && $j==15 && $k==$MOD-1);
$code.=" pxor $xmm,$xmm\n" if ($rc4 && $j<=1);
$code.=<<___;
#rc4# movl ($dat,$YY,4),$TY#d
#md5# xor $d,$tmp
#rc4# movl $TX[0]#d,($dat,$YY,4)
#md5# or $b,$tmp
#md5# add 4*`((7*$j)%16)`($inp),$a
#rc4# add $TY#b,$TX[0]#b
#rc4# movl `4*(($k+1)%$MOD)`(`$k==$MOD-1?"$dat,$XX[0],4":"$XX[1]"`),$TX[1]#d
#md5# add \$$K[$i],$a
#rc4# movz $TX[0]#b,$TX[0]#d
#md5# xor $c,$tmp
#rc4# movl $TY#d,4*$k($XX[1])
#md5# add $tmp,$a
#rc4# add $TX[1]#b,$YY#b
#md5# rol \$$rot3[$j%4],$a
#md5# mov \$-1,$tmp # forward reference
#rc4# pinsrw \$`($j>>1)&7`,($dat,$TX[0],4),$xmm\n
#md5# add $b,$a
___
$code.=<<___ if ($rc4 && $j==15);
mov $XX[0],$XX[1]
xor $XX[0],$XX[0] # keyword to partial register
mov $XX[1]#b,$XX[0]#b
mov $YY,$XX[1]
xor $YY,$YY # keyword to partial register
mov $XX[1]#b,$YY#b
lea ($dat,$XX[0],4),$XX[1]
psllq \$8,%xmm1
pxor %xmm0,%xmm5
pxor %xmm1,%xmm5
___
}
my $i=0;
for(;$i<16;$i++) { R0($i,@V); unshift(@V,pop(@V)); push(@TX,shift(@TX)); }
for(;$i<32;$i++) { R1($i,@V); unshift(@V,pop(@V)); push(@TX,shift(@TX)); }
for(;$i<48;$i++) { R2($i,@V); unshift(@V,pop(@V)); push(@TX,shift(@TX)); }
for(;$i<64;$i++) { R3($i,@V); unshift(@V,pop(@V)); push(@TX,shift(@TX)); }
$code.=<<___;
#md5# add 0*4(%rsp),$V[0] # accumulate hash value
#md5# add 1*4(%rsp),$V[1]
#md5# add 2*4(%rsp),$V[2]
#md5# add 3*4(%rsp),$V[3]
#rc4# movdqu %xmm2,($out,$in0) # write RC4 output
#rc4# movdqu %xmm3,16($out,$in0)
#rc4# movdqu %xmm4,32($out,$in0)
#rc4# movdqu %xmm5,48($out,$in0)
#md5# lea 64($inp),$inp
#rc4# lea 64($in0),$in0
cmp 16(%rsp),$inp # are we done?
jb .Loop
#md5# mov 24(%rsp),$len # restore pointer to MD5_CTX
#rc4# sub $TX[0]#b,$YY#b # correct $YY
#md5# mov $V[0],0*4($len) # write MD5_CTX
#md5# mov $V[1],1*4($len)
#md5# mov $V[2],2*4($len)
#md5# mov $V[3],3*4($len)
___
$code.=<<___ if ($rc4 && (!$md5 || $D));
mov 32(%rsp),$len # restore original $len
and \$63,$len # remaining bytes
jnz .Loop1
jmp .Ldone
.align 16
.Loop1:
add $TX[0]#b,$YY#b
movl ($dat,$YY,4),$TY#d
movl $TX[0]#d,($dat,$YY,4)
movl $TY#d,($dat,$XX[0],4)
add $TY#b,$TX[0]#b
inc $XX[0]#b
movl ($dat,$TX[0],4),$TY#d
movl ($dat,$XX[0],4),$TX[0]#d
xorb ($in0),$TY#b
movb $TY#b,($out,$in0)
lea 1($in0),$in0
dec $len
jnz .Loop1
.Ldone:
___
$code.=<<___;
#rc4# sub \$1,$XX[0]#b
#rc4# movl $XX[0]#d,-8($dat)
#rc4# movl $YY#d,-4($dat)
mov 40(%rsp),%r15
.cfi_restore %r15
mov 48(%rsp),%r14
.cfi_restore %r14
mov 56(%rsp),%r13
.cfi_restore %r13
mov 64(%rsp),%r12
.cfi_restore %r12
mov 72(%rsp),%rbp
.cfi_restore %rbp
mov 80(%rsp),%rbx
.cfi_restore %rbx
lea 88(%rsp),%rsp
.cfi_adjust_cfa_offset -88
.Lepilogue:
.Labort:
ret
.cfi_endproc
.size $func,.-$func
___
if ($rc4 && $D) { # sole purpose of this section is to provide
# option to use the generated module as drop-in
# replacement for rc4-x86_64.pl for debugging
# and testing purposes...
my ($idx,$ido)=("%r8","%r9");
my ($dat,$len,$inp)=("%rdi","%rsi","%rdx");
$code.=<<___;
.globl RC4_set_key
.type RC4_set_key,\@function,3
.align 16
RC4_set_key:
.cfi_startproc
lea 8($dat),$dat
lea ($inp,$len),$inp
neg $len
mov $len,%rcx
xor %eax,%eax
xor $ido,$ido
xor %r10,%r10
xor %r11,%r11
jmp .Lw1stloop
.align 16
.Lw1stloop:
mov %eax,($dat,%rax,4)
add \$1,%al
jnc .Lw1stloop
xor $ido,$ido
xor $idx,$idx
.align 16
.Lw2ndloop:
mov ($dat,$ido,4),%r10d
add ($inp,$len,1),$idx#b
add %r10b,$idx#b
add \$1,$len
mov ($dat,$idx,4),%r11d
cmovz %rcx,$len
mov %r10d,($dat,$idx,4)
mov %r11d,($dat,$ido,4)
add \$1,$ido#b
jnc .Lw2ndloop
xor %eax,%eax
mov %eax,-8($dat)
mov %eax,-4($dat)
ret
.cfi_endproc
.size RC4_set_key,.-RC4_set_key
.globl RC4_options
.type RC4_options,\@abi-omnipotent
.align 16
RC4_options:
lea .Lopts(%rip),%rax
ret
.align 64
.Lopts:
.asciz "rc4(64x,int)"
.align 64
.size RC4_options,.-RC4_options
___
}
# EXCEPTION_DISPOSITION handler (EXCEPTION_RECORD *rec,ULONG64 frame,
# CONTEXT *context,DISPATCHER_CONTEXT *disp)
if ($win64) {
my $rec="%rcx";
my $frame="%rdx";
my $context="%r8";
my $disp="%r9";
$code.=<<___;
.extern __imp_RtlVirtualUnwind
.type se_handler,\@abi-omnipotent
.align 16
se_handler:
push %rsi
push %rdi
push %rbx
push %rbp
push %r12
push %r13
push %r14
push %r15
pushfq
sub \$64,%rsp
mov 120($context),%rax # pull context->Rax
mov 248($context),%rbx # pull context->Rip
lea .Lbody(%rip),%r10
cmp %r10,%rbx # context->Rip<.Lbody
jb .Lin_prologue
mov 152($context),%rax # pull context->Rsp
lea .Lepilogue(%rip),%r10
cmp %r10,%rbx # context->Rip>=.Lepilogue
jae .Lin_prologue
mov 40(%rax),%r15
mov 48(%rax),%r14
mov 56(%rax),%r13
mov 64(%rax),%r12
mov 72(%rax),%rbp
mov 80(%rax),%rbx
lea 88(%rax),%rax
mov %rbx,144($context) # restore context->Rbx
mov %rbp,160($context) # restore context->Rbp
mov %r12,216($context) # restore context->R12
mov %r13,224($context) # restore context->R12
mov %r14,232($context) # restore context->R14
mov %r15,240($context) # restore context->R15
.Lin_prologue:
mov 8(%rax),%rdi
mov 16(%rax),%rsi
mov %rax,152($context) # restore context->Rsp
mov %rsi,168($context) # restore context->Rsi
mov %rdi,176($context) # restore context->Rdi
mov 40($disp),%rdi # disp->ContextRecord
mov $context,%rsi # context
mov \$154,%ecx # sizeof(CONTEXT)
.long 0xa548f3fc # cld; rep movsq
mov $disp,%rsi
xor %rcx,%rcx # arg1, UNW_FLAG_NHANDLER
mov 8(%rsi),%rdx # arg2, disp->ImageBase
mov 0(%rsi),%r8 # arg3, disp->ControlPc
mov 16(%rsi),%r9 # arg4, disp->FunctionEntry
mov 40(%rsi),%r10 # disp->ContextRecord
lea 56(%rsi),%r11 # &disp->HandlerData
lea 24(%rsi),%r12 # &disp->EstablisherFrame
mov %r10,32(%rsp) # arg5
mov %r11,40(%rsp) # arg6
mov %r12,48(%rsp) # arg7
mov %rcx,56(%rsp) # arg8, (NULL)
call *__imp_RtlVirtualUnwind(%rip)
mov \$1,%eax # ExceptionContinueSearch
add \$64,%rsp
popfq
pop %r15
pop %r14
pop %r13
pop %r12
pop %rbp
pop %rbx
pop %rdi
pop %rsi
ret
.size se_handler,.-se_handler
.section .pdata
.align 4
.rva .LSEH_begin_$func
.rva .LSEH_end_$func
.rva .LSEH_info_$func
.section .xdata
.align 8
.LSEH_info_$func:
.byte 9,0,0,0
.rva se_handler
___
}
sub reg_part {
my ($reg,$conv)=@_;
if ($reg =~ /%r[0-9]+/) { $reg .= $conv; }
elsif ($conv eq "b") { $reg =~ s/%[er]([^x]+)x?/%$1l/; }
elsif ($conv eq "w") { $reg =~ s/%[er](.+)/%$1/; }
elsif ($conv eq "d") { $reg =~ s/%[er](.+)/%e$1/; }
return $reg;
}
$code =~ s/(%[a-z0-9]+)#([bwd])/reg_part($1,$2)/gem;
$code =~ s/\`([^\`]*)\`/eval $1/gem;
$code =~ s/pinsrw\s+\$0,/movd /gm;
$code =~ s/#md5#//gm if ($md5);
$code =~ s/#rc4#//gm if ($rc4);
print $code;
close STDOUT or die "error closing STDOUT: $!";