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127 lines
2.3 KiB
127 lines
2.3 KiB
#!/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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