| #! /usr/bin/env perl |
| # Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved. |
| # |
| # Licensed under the Apache License 2.0 (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 |
| |
| |
| $0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1; |
| push(@INC,"${dir}","${dir}../../perlasm"); |
| require "x86asm.pl"; |
| require "cbc.pl"; |
| |
| $output = pop and open STDOUT,">$output"; |
| |
| &asm_init($ARGV[0],$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(); |
| |
| close STDOUT or die "error closing STDOUT: $!"; |
| |
| sub BF_encrypt |
| { |
| local($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]); |
| } |
| |