138 lines
2.6 KiB
Perl
138 lines
2.6 KiB
Perl
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#!/usr/local/bin/perl
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$0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
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push(@INC,"${dir}","${dir}../../perlasm");
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require "x86asm.pl";
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require "cbc.pl";
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&asm_init($ARGV[0],"bf-586.pl",$ARGV[$#ARGV] eq "386");
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$BF_ROUNDS=16;
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$BF_OFF=($BF_ROUNDS+2)*4;
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$L="edi";
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$R="esi";
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$P="ebp";
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$tmp1="eax";
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$tmp2="ebx";
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$tmp3="ecx";
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$tmp4="edx";
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&BF_encrypt("BF_encrypt",1);
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&BF_encrypt("BF_decrypt",0);
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&cbc("BF_cbc_encrypt","BF_encrypt","BF_decrypt",1,4,5,3,-1,-1);
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&asm_finish();
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sub BF_encrypt
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{
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local($name,$enc)=@_;
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&function_begin_B($name,"");
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&comment("");
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&push("ebp");
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&push("ebx");
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&mov($tmp2,&wparam(0));
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&mov($P,&wparam(1));
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&push("esi");
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&push("edi");
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&comment("Load the 2 words");
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&mov($L,&DWP(0,$tmp2,"",0));
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&mov($R,&DWP(4,$tmp2,"",0));
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&xor( $tmp1, $tmp1);
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# encrypting part
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if ($enc)
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{
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&mov($tmp2,&DWP(0,$P,"",0));
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&xor( $tmp3, $tmp3);
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&xor($L,$tmp2);
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for ($i=0; $i<$BF_ROUNDS; $i+=2)
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{
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&comment("");
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&comment("Round $i");
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&BF_ENCRYPT($i+1,$R,$L,$P,$tmp1,$tmp2,$tmp3,$tmp4,1);
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&comment("");
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&comment("Round ".sprintf("%d",$i+1));
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&BF_ENCRYPT($i+2,$L,$R,$P,$tmp1,$tmp2,$tmp3,$tmp4,1);
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}
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# &mov($tmp1,&wparam(0)); In last loop
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&mov($tmp4,&DWP(($BF_ROUNDS+1)*4,$P,"",0));
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}
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else
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{
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&mov($tmp2,&DWP(($BF_ROUNDS+1)*4,$P,"",0));
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&xor( $tmp3, $tmp3);
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&xor($L,$tmp2);
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for ($i=$BF_ROUNDS; $i>0; $i-=2)
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{
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&comment("");
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&comment("Round $i");
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&BF_ENCRYPT($i,$R,$L,$P,$tmp1,$tmp2,$tmp3,$tmp4,0);
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&comment("");
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&comment("Round ".sprintf("%d",$i-1));
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&BF_ENCRYPT($i-1,$L,$R,$P,$tmp1,$tmp2,$tmp3,$tmp4,0);
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}
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# &mov($tmp1,&wparam(0)); In last loop
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&mov($tmp4,&DWP(0,$P,"",0));
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}
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&xor($R,$tmp4);
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&mov(&DWP(4,$tmp1,"",0),$L);
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&mov(&DWP(0,$tmp1,"",0),$R);
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&function_end($name);
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}
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sub BF_ENCRYPT
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{
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local($i,$L,$R,$P,$tmp1,$tmp2,$tmp3,$tmp4,$enc)=@_;
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&mov( $tmp4, &DWP(&n2a($i*4),$P,"",0)); # for next round
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&mov( $tmp2, $R);
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&xor( $L, $tmp4);
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&shr( $tmp2, 16);
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&mov( $tmp4, $R);
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&movb( &LB($tmp1), &HB($tmp2)); # A
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&and( $tmp2, 0xff); # B
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&movb( &LB($tmp3), &HB($tmp4)); # C
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&and( $tmp4, 0xff); # D
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&mov( $tmp1, &DWP(&n2a($BF_OFF+0x0000),$P,$tmp1,4));
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&mov( $tmp2, &DWP(&n2a($BF_OFF+0x0400),$P,$tmp2,4));
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&add( $tmp2, $tmp1);
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&mov( $tmp1, &DWP(&n2a($BF_OFF+0x0800),$P,$tmp3,4));
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&xor( $tmp2, $tmp1);
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&mov( $tmp4, &DWP(&n2a($BF_OFF+0x0C00),$P,$tmp4,4));
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&add( $tmp2, $tmp4);
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if (($enc && ($i != 16)) || ((!$enc) && ($i != 1)))
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{ &xor( $tmp1, $tmp1); }
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else
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{
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&comment("Load parameter 0 ($i) enc=$enc");
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&mov($tmp1,&wparam(0));
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} # In last loop
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&xor( $L, $tmp2);
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# delay
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}
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sub n2a
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{
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sprintf("%d",$_[0]);
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}
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