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128 lines
2.3 KiB
128 lines
2.3 KiB
14 years ago
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#!/usr/local/bin/perl
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push(@INC,"perlasm","../../perlasm");
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require "x86asm.pl";
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require "cbc.pl";
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&asm_init($ARGV[0],"bf-686.pl");
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$BF_ROUNDS=16;
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$BF_OFF=($BF_ROUNDS+2)*4;
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$L="ecx";
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$R="edx";
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$P="edi";
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$tot="esi";
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$tmp1="eax";
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$tmp2="ebx";
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$tmp3="ebp";
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&des_encrypt("BF_encrypt",1);
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&des_encrypt("BF_decrypt",0);
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&cbc("BF_cbc_encrypt","BF_encrypt","BF_decrypt",1,4,5,3,-1,-1);
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&asm_finish();
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&file_end();
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sub des_encrypt
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{
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local($name,$enc)=@_;
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&function_begin($name,"");
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&comment("");
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&comment("Load the 2 words");
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&mov("eax",&wparam(0));
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&mov($L,&DWP(0,"eax","",0));
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&mov($R,&DWP(4,"eax","",0));
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&comment("");
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&comment("P pointer, s and enc flag");
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&mov($P,&wparam(1));
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&xor( $tmp1, $tmp1);
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&xor( $tmp2, $tmp2);
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# encrypting part
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if ($enc)
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{
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&xor($L,&DWP(0,$P,"",0));
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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,$P,$tot,$tmp1,$tmp2,$tmp3);
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&comment("");
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&comment("Round ".sprintf("%d",$i+1));
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&BF_ENCRYPT($i+2,$L,$R,$P,$tot,$tmp1,$tmp2,$tmp3);
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}
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&xor($R,&DWP(($BF_ROUNDS+1)*4,$P,"",0));
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&mov("eax",&wparam(0));
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&mov(&DWP(0,"eax","",0),$R);
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&mov(&DWP(4,"eax","",0),$L);
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&function_end_A($name);
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}
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else
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{
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&xor($L,&DWP(($BF_ROUNDS+1)*4,$P,"",0));
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for ($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,$P,$tot,$tmp1,$tmp2,$tmp3);
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&comment("");
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&comment("Round ".sprintf("%d",$i-1));
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&BF_ENCRYPT($i-1,$L,$R,$P,$tot,$tmp1,$tmp2,$tmp3);
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}
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&xor($R,&DWP(0,$P,"",0));
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&mov("eax",&wparam(0));
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&mov(&DWP(0,"eax","",0),$R);
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&mov(&DWP(4,"eax","",0),$L);
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&function_end_A($name);
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}
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&function_end_B($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,$tot,$tmp1,$tmp2,$tmp3)=@_;
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&rotr( $R, 16);
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&mov( $tot, &DWP(&n2a($i*4),$P,"",0));
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&movb( &LB($tmp1), &HB($R));
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&movb( &LB($tmp2), &LB($R));
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&rotr( $R, 16);
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&xor( $L, $tot);
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&mov( $tot, &DWP(&n2a($BF_OFF+0x0000),$P,$tmp1,4));
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&mov( $tmp3, &DWP(&n2a($BF_OFF+0x0400),$P,$tmp2,4));
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&movb( &LB($tmp1), &HB($R));
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&movb( &LB($tmp2), &LB($R));
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&add( $tot, $tmp3);
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&mov( $tmp1, &DWP(&n2a($BF_OFF+0x0800),$P,$tmp1,4)); # delay
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&xor( $tot, $tmp1);
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&mov( $tmp3, &DWP(&n2a($BF_OFF+0x0C00),$P,$tmp2,4));
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&add( $tot, $tmp3);
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&xor( $tmp1, $tmp1);
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&xor( $L, $tot);
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# delay
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}
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sub n2a
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{
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sprintf("%d",$_[0]);
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}
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