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| 1 #!/usr/local/bin/perl | |
| 2 | |
| 3 push(@INC,"perlasm","../../perlasm"); | |
| 4 require "x86asm.pl"; | |
| 5 require "cbc.pl"; | |
| 6 | |
| 7 &asm_init($ARGV[0],"bf-686.pl"); | |
| 8 | |
| 9 $BF_ROUNDS=16; | |
| 10 $BF_OFF=($BF_ROUNDS+2)*4; | |
| 11 $L="ecx"; | |
| 12 $R="edx"; | |
| 13 $P="edi"; | |
| 14 $tot="esi"; | |
| 15 $tmp1="eax"; | |
| 16 $tmp2="ebx"; | |
| 17 $tmp3="ebp"; | |
| 18 | |
| 19 &des_encrypt("BF_encrypt",1); | |
| 20 &des_encrypt("BF_decrypt",0); | |
| 21 &cbc("BF_cbc_encrypt","BF_encrypt","BF_decrypt",1,4,5,3,-1,-1); | |
| 22 | |
| 23 &asm_finish(); | |
| 24 | |
| 25 &file_end(); | |
| 26 | |
| 27 sub des_encrypt | |
| 28 { | |
| 29 local($name,$enc)=@_; | |
| 30 | |
| 31 &function_begin($name,""); | |
| 32 | |
| 33 &comment(""); | |
| 34 &comment("Load the 2 words"); | |
| 35 &mov("eax",&wparam(0)); | |
| 36 &mov($L,&DWP(0,"eax","",0)); | |
| 37 &mov($R,&DWP(4,"eax","",0)); | |
| 38 | |
| 39 &comment(""); | |
| 40 &comment("P pointer, s and enc flag"); | |
| 41 &mov($P,&wparam(1)); | |
| 42 | |
| 43 &xor( $tmp1, $tmp1); | |
| 44 &xor( $tmp2, $tmp2); | |
| 45 | |
| 46 # encrypting part | |
| 47 | |
| 48 if ($enc) | |
| 49 { | |
| 50 &xor($L,&DWP(0,$P,"",0)); | |
| 51 for ($i=0; $i<$BF_ROUNDS; $i+=2) | |
| 52 { | |
| 53 &comment(""); | |
| 54 &comment("Round $i"); | |
| 55 &BF_ENCRYPT($i+1,$R,$L,$P,$tot,$tmp1,$tmp2,$tmp3); | |
| 56 | |
| 57 &comment(""); | |
| 58 &comment("Round ".sprintf("%d",$i+1)); | |
| 59 &BF_ENCRYPT($i+2,$L,$R,$P,$tot,$tmp1,$tmp2,$tmp3); | |
| 60 } | |
| 61 &xor($R,&DWP(($BF_ROUNDS+1)*4,$P,"",0)); | |
| 62 | |
| 63 &mov("eax",&wparam(0)); | |
| 64 &mov(&DWP(0,"eax","",0),$R); | |
| 65 &mov(&DWP(4,"eax","",0),$L); | |
| 66 &function_end_A($name); | |
| 67 } | |
| 68 else | |
| 69 { | |
| 70 &xor($L,&DWP(($BF_ROUNDS+1)*4,$P,"",0)); | |
| 71 for ($i=$BF_ROUNDS; $i>0; $i-=2) | |
| 72 { | |
| 73 &comment(""); | |
| 74 &comment("Round $i"); | |
| 75 &BF_ENCRYPT($i,$R,$L,$P,$tot,$tmp1,$tmp2,$tmp3); | |
| 76 &comment(""); | |
| 77 &comment("Round ".sprintf("%d",$i-1)); | |
| 78 &BF_ENCRYPT($i-1,$L,$R,$P,$tot,$tmp1,$tmp2,$tmp3); | |
| 79 } | |
| 80 &xor($R,&DWP(0,$P,"",0)); | |
| 81 | |
| 82 &mov("eax",&wparam(0)); | |
| 83 &mov(&DWP(0,"eax","",0),$R); | |
| 84 &mov(&DWP(4,"eax","",0),$L); | |
| 85 &function_end_A($name); | |
| 86 } | |
| 87 | |
| 88 &function_end_B($name); | |
| 89 } | |
| 90 | |
| 91 sub BF_ENCRYPT | |
| 92 { | |
| 93 local($i,$L,$R,$P,$tot,$tmp1,$tmp2,$tmp3)=@_; | |
| 94 | |
| 95 &rotr( $R, 16); | |
| 96 &mov( $tot, &DWP(&n2a($i*4),$P,"",0)); | |
| 97 | |
| 98 &movb( &LB($tmp1), &HB($R)); | |
| 99 &movb( &LB($tmp2), &LB($R)); | |
| 100 | |
| 101 &rotr( $R, 16); | |
| 102 &xor( $L, $tot); | |
| 103 | |
| 104 &mov( $tot, &DWP(&n2a($BF_OFF+0x0000),$P,$tmp1,4)); | |
| 105 &mov( $tmp3, &DWP(&n2a($BF_OFF+0x0400),$P,$tmp2,4)); | |
| 106 | |
| 107 &movb( &LB($tmp1), &HB($R)); | |
| 108 &movb( &LB($tmp2), &LB($R)); | |
| 109 | |
| 110 &add( $tot, $tmp3); | |
| 111 &mov( $tmp1, &DWP(&n2a($BF_OFF+0x0800),$P,$tmp1,4)); # delay | |
| 112 | |
| 113 &xor( $tot, $tmp1); | |
| 114 &mov( $tmp3, &DWP(&n2a($BF_OFF+0x0C00),$P,$tmp2,4)); | |
| 115 | |
| 116 &add( $tot, $tmp3); | |
| 117 &xor( $tmp1, $tmp1); | |
| 118 | |
| 119 &xor( $L, $tot); | |
| 120 # delay | |
| 121 } | |
| 122 | |
| 123 sub n2a | |
| 124 { | |
| 125 sprintf("%d",$_[0]); | |
| 126 } | |
| 127 | |
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Chromium Code Reviews
Issue 2072073002:
Delete bundled copy of OpenSSL and replace with README. (Closed)
Base URL: https://chromium.googlesource.com/chromium/deps/openssl@master