You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
137 lines
2.6 KiB
137 lines
2.6 KiB
#!/usr/local/bin/perl |
|
|
|
$0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1; |
|
push(@INC,"${dir}","${dir}../../perlasm"); |
|
require "x86asm.pl"; |
|
require "cbc.pl"; |
|
|
|
&asm_init($ARGV[0],"bf-586.pl",$ARGV[$#ARGV] eq "386"); |
|
|
|
$BF_ROUNDS=16; |
|
$BF_OFF=($BF_ROUNDS+2)*4; |
|
$L="edi"; |
|
$R="esi"; |
|
$P="ebp"; |
|
$tmp1="eax"; |
|
$tmp2="ebx"; |
|
$tmp3="ecx"; |
|
$tmp4="edx"; |
|
|
|
&BF_encrypt("BF_encrypt",1); |
|
&BF_encrypt("BF_decrypt",0); |
|
&cbc("BF_cbc_encrypt","BF_encrypt","BF_decrypt",1,4,5,3,-1,-1); |
|
&asm_finish(); |
|
|
|
sub BF_encrypt |
|
{ |
|
local($name,$enc)=@_; |
|
|
|
&function_begin_B($name,""); |
|
|
|
&comment(""); |
|
|
|
&push("ebp"); |
|
&push("ebx"); |
|
&mov($tmp2,&wparam(0)); |
|
&mov($P,&wparam(1)); |
|
&push("esi"); |
|
&push("edi"); |
|
|
|
&comment("Load the 2 words"); |
|
&mov($L,&DWP(0,$tmp2,"",0)); |
|
&mov($R,&DWP(4,$tmp2,"",0)); |
|
|
|
&xor( $tmp1, $tmp1); |
|
|
|
# encrypting part |
|
|
|
if ($enc) |
|
{ |
|
&mov($tmp2,&DWP(0,$P,"",0)); |
|
&xor( $tmp3, $tmp3); |
|
|
|
&xor($L,$tmp2); |
|
for ($i=0; $i<$BF_ROUNDS; $i+=2) |
|
{ |
|
&comment(""); |
|
&comment("Round $i"); |
|
&BF_ENCRYPT($i+1,$R,$L,$P,$tmp1,$tmp2,$tmp3,$tmp4,1); |
|
|
|
&comment(""); |
|
&comment("Round ".sprintf("%d",$i+1)); |
|
&BF_ENCRYPT($i+2,$L,$R,$P,$tmp1,$tmp2,$tmp3,$tmp4,1); |
|
} |
|
# &mov($tmp1,&wparam(0)); In last loop |
|
&mov($tmp4,&DWP(($BF_ROUNDS+1)*4,$P,"",0)); |
|
} |
|
else |
|
{ |
|
&mov($tmp2,&DWP(($BF_ROUNDS+1)*4,$P,"",0)); |
|
&xor( $tmp3, $tmp3); |
|
|
|
&xor($L,$tmp2); |
|
for ($i=$BF_ROUNDS; $i>0; $i-=2) |
|
{ |
|
&comment(""); |
|
&comment("Round $i"); |
|
&BF_ENCRYPT($i,$R,$L,$P,$tmp1,$tmp2,$tmp3,$tmp4,0); |
|
&comment(""); |
|
&comment("Round ".sprintf("%d",$i-1)); |
|
&BF_ENCRYPT($i-1,$L,$R,$P,$tmp1,$tmp2,$tmp3,$tmp4,0); |
|
} |
|
# &mov($tmp1,&wparam(0)); In last loop |
|
&mov($tmp4,&DWP(0,$P,"",0)); |
|
} |
|
|
|
&xor($R,$tmp4); |
|
&mov(&DWP(4,$tmp1,"",0),$L); |
|
|
|
&mov(&DWP(0,$tmp1,"",0),$R); |
|
&function_end($name); |
|
} |
|
|
|
sub BF_ENCRYPT |
|
{ |
|
local($i,$L,$R,$P,$tmp1,$tmp2,$tmp3,$tmp4,$enc)=@_; |
|
|
|
&mov( $tmp4, &DWP(&n2a($i*4),$P,"",0)); # for next round |
|
|
|
&mov( $tmp2, $R); |
|
&xor( $L, $tmp4); |
|
|
|
&shr( $tmp2, 16); |
|
&mov( $tmp4, $R); |
|
|
|
&movb( &LB($tmp1), &HB($tmp2)); # A |
|
&and( $tmp2, 0xff); # B |
|
|
|
&movb( &LB($tmp3), &HB($tmp4)); # C |
|
&and( $tmp4, 0xff); # D |
|
|
|
&mov( $tmp1, &DWP(&n2a($BF_OFF+0x0000),$P,$tmp1,4)); |
|
&mov( $tmp2, &DWP(&n2a($BF_OFF+0x0400),$P,$tmp2,4)); |
|
|
|
&add( $tmp2, $tmp1); |
|
&mov( $tmp1, &DWP(&n2a($BF_OFF+0x0800),$P,$tmp3,4)); |
|
|
|
&xor( $tmp2, $tmp1); |
|
&mov( $tmp4, &DWP(&n2a($BF_OFF+0x0C00),$P,$tmp4,4)); |
|
|
|
&add( $tmp2, $tmp4); |
|
if (($enc && ($i != 16)) || ((!$enc) && ($i != 1))) |
|
{ &xor( $tmp1, $tmp1); } |
|
else |
|
{ |
|
&comment("Load parameter 0 ($i) enc=$enc"); |
|
&mov($tmp1,&wparam(0)); |
|
} # In last loop |
|
|
|
&xor( $L, $tmp2); |
|
# delay |
|
} |
|
|
|
sub n2a |
|
{ |
|
sprintf("%d",$_[0]); |
|
} |
|
|
|
|