1 #!/usr/local/bin/perl 2 3 $0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1; 4 push(@INC,"${dir}","${dir}../../perlasm"); 5 require "x86asm.pl"; 6 require "cbc.pl"; 7 8 &asm_init($ARGV[0],"bf-586.pl",$ARGV[$#ARGV] eq "386"); 9 10 $BF_ROUNDS=16; 11 $BF_OFF=($BF_ROUNDS+2)*4; 12 $L="edi"; 13 $R="esi"; 14 $P="ebp"; 15 $tmp1="eax"; 16 $tmp2="ebx"; 17 $tmp3="ecx"; 18 $tmp4="edx"; 19 20 &BF_encrypt("BF_encrypt",1); 21 &BF_encrypt("BF_decrypt",0); 22 &cbc("BF_cbc_encrypt","BF_encrypt","BF_decrypt",1,4,5,3,-1,-1); 23 &asm_finish(); 24 25 sub BF_encrypt 26 { 27 local($name,$enc)=@_; 28 29 &function_begin_B($name,""); 30 31 &comment(""); 32 33 &push("ebp"); 34 &push("ebx"); 35 &mov($tmp2,&wparam(0)); 36 &mov($P,&wparam(1)); 37 &push("esi"); 38 &push("edi"); 39 40 &comment("Load the 2 words"); 41 &mov($L,&DWP(0,$tmp2,"",0)); 42 &mov($R,&DWP(4,$tmp2,"",0)); 43 44 &xor( $tmp1, $tmp1); 45 46 # encrypting part 47 48 if ($enc) 49 { 50 &mov($tmp2,&DWP(0,$P,"",0)); 51 &xor( $tmp3, $tmp3); 52 53 &xor($L,$tmp2); 54 for ($i=0; $i<$BF_ROUNDS; $i+=2) 55 { 56 &comment(""); 57 &comment("Round $i"); 58 &BF_ENCRYPT($i+1,$R,$L,$P,$tmp1,$tmp2,$tmp3,$tmp4,1); 59 60 &comment(""); 61 &comment("Round ".sprintf("%d",$i+1)); 62 &BF_ENCRYPT($i+2,$L,$R,$P,$tmp1,$tmp2,$tmp3,$tmp4,1); 63 } 64 # &mov($tmp1,&wparam(0)); In last loop 65 &mov($tmp4,&DWP(($BF_ROUNDS+1)*4,$P,"",0)); 66 } 67 else 68 { 69 &mov($tmp2,&DWP(($BF_ROUNDS+1)*4,$P,"",0)); 70 &xor( $tmp3, $tmp3); 71 72 &xor($L,$tmp2); 73 for ($i=$BF_ROUNDS; $i>0; $i-=2) 74 { 75 &comment(""); 76 &comment("Round $i"); 77 &BF_ENCRYPT($i,$R,$L,$P,$tmp1,$tmp2,$tmp3,$tmp4,0); 78 &comment(""); 79 &comment("Round ".sprintf("%d",$i-1)); 80 &BF_ENCRYPT($i-1,$L,$R,$P,$tmp1,$tmp2,$tmp3,$tmp4,0); 81 } 82 # &mov($tmp1,&wparam(0)); In last loop 83 &mov($tmp4,&DWP(0,$P,"",0)); 84 } 85 86 &xor($R,$tmp4); 87 &mov(&DWP(4,$tmp1,"",0),$L); 88 89 &mov(&DWP(0,$tmp1,"",0),$R); 90 &function_end($name); 91 } 92 93 sub BF_ENCRYPT 94 { 95 local($i,$L,$R,$P,$tmp1,$tmp2,$tmp3,$tmp4,$enc)=@_; 96 97 &mov( $tmp4, &DWP(&n2a($i*4),$P,"",0)); # for next round 98 99 &mov( $tmp2, $R); 100 &xor( $L, $tmp4); 101 102 &shr( $tmp2, 16); 103 &mov( $tmp4, $R); 104 105 &movb( &LB($tmp1), &HB($tmp2)); # A 106 &and( $tmp2, 0xff); # B 107 108 &movb( &LB($tmp3), &HB($tmp4)); # C 109 &and( $tmp4, 0xff); # D 110 111 &mov( $tmp1, &DWP(&n2a($BF_OFF+0x0000),$P,$tmp1,4)); 112 &mov( $tmp2, &DWP(&n2a($BF_OFF+0x0400),$P,$tmp2,4)); 113 114 &add( $tmp2, $tmp1); 115 &mov( $tmp1, &DWP(&n2a($BF_OFF+0x0800),$P,$tmp3,4)); 116 117 &xor( $tmp2, $tmp1); 118 &mov( $tmp4, &DWP(&n2a($BF_OFF+0x0C00),$P,$tmp4,4)); 119 120 &add( $tmp2, $tmp4); 121 if (($enc && ($i != 16)) || ((!$enc) && ($i != 1))) 122 { &xor( $tmp1, $tmp1); } 123 else 124 { 125 &comment("Load parameter 0 ($i) enc=$enc"); 126 &mov($tmp1,&wparam(0)); 127 } # In last loop 128 129 &xor( $L, $tmp2); 130 # delay 131 } 132 133 sub n2a 134 { 135 sprintf("%d",$_[0]); 136 } 137 138
