| 1 | #! /usr/bin/env perl
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| 2 | # Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | #
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| 4 | # Licensed under the Apache License 2.0 (the "License"). You may not use
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| 5 | # this file except in compliance with the License. You can obtain a copy
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| 6 | # in the file LICENSE in the source distribution or at
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| 7 | # https://www.openssl.org/source/license.html
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| 8 |
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| 9 |
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| 10 | $0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
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| 11 | push(@INC,"${dir}","${dir}../../perlasm");
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| 12 | require "x86asm.pl";
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| 13 | require "cbc.pl";
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| 14 |
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| 15 | $output = pop and open STDOUT,">$output";
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| 16 |
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| 17 | &asm_init($ARGV[0],$ARGV[$#ARGV] eq "386");
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| 18 |
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| 19 | $BF_ROUNDS=16;
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| 20 | $BF_OFF=($BF_ROUNDS+2)*4;
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| 21 | $L="edi";
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| 22 | $R="esi";
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| 23 | $P="ebp";
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| 24 | $tmp1="eax";
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| 25 | $tmp2="ebx";
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| 26 | $tmp3="ecx";
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| 27 | $tmp4="edx";
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| 28 |
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| 29 | &BF_encrypt("BF_encrypt",1);
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| 30 | &BF_encrypt("BF_decrypt",0);
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| 31 | &cbc("BF_cbc_encrypt","BF_encrypt","BF_decrypt",1,4,5,3,-1,-1);
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| 32 | &asm_finish();
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| 33 |
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| 34 | close STDOUT or die "error closing STDOUT: $!";
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| 35 |
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| 36 | sub BF_encrypt
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| 37 | {
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| 38 | local($name,$enc)=@_;
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| 39 |
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| 40 | &function_begin_B($name,"");
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| 41 |
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| 42 | &comment("");
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| 43 |
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| 44 | &push("ebp");
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| 45 | &push("ebx");
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| 46 | &mov($tmp2,&wparam(0));
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| 47 | &mov($P,&wparam(1));
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| 48 | &push("esi");
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| 49 | &push("edi");
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| 50 |
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| 51 | &comment("Load the 2 words");
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| 52 | &mov($L,&DWP(0,$tmp2,"",0));
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| 53 | &mov($R,&DWP(4,$tmp2,"",0));
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| 54 |
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| 55 | &xor( $tmp1, $tmp1);
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| 56 |
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| 57 | # encrypting part
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| 58 |
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| 59 | if ($enc)
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| 60 | {
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| 61 | &mov($tmp2,&DWP(0,$P,"",0));
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| 62 | &xor( $tmp3, $tmp3);
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| 63 |
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| 64 | &xor($L,$tmp2);
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| 65 | for ($i=0; $i<$BF_ROUNDS; $i+=2)
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| 66 | {
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| 67 | &comment("");
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| 68 | &comment("Round $i");
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| 69 | &BF_ENCRYPT($i+1,$R,$L,$P,$tmp1,$tmp2,$tmp3,$tmp4,1);
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| 70 |
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| 71 | &comment("");
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| 72 | &comment("Round ".sprintf("%d",$i+1));
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| 73 | &BF_ENCRYPT($i+2,$L,$R,$P,$tmp1,$tmp2,$tmp3,$tmp4,1);
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| 74 | }
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| 75 | # &mov($tmp1,&wparam(0)); In last loop
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| 76 | &mov($tmp4,&DWP(($BF_ROUNDS+1)*4,$P,"",0));
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| 77 | }
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| 78 | else
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| 79 | {
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| 80 | &mov($tmp2,&DWP(($BF_ROUNDS+1)*4,$P,"",0));
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| 81 | &xor( $tmp3, $tmp3);
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| 82 |
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| 83 | &xor($L,$tmp2);
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| 84 | for ($i=$BF_ROUNDS; $i>0; $i-=2)
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| 85 | {
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| 86 | &comment("");
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| 87 | &comment("Round $i");
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| 88 | &BF_ENCRYPT($i,$R,$L,$P,$tmp1,$tmp2,$tmp3,$tmp4,0);
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| 89 | &comment("");
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| 90 | &comment("Round ".sprintf("%d",$i-1));
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| 91 | &BF_ENCRYPT($i-1,$L,$R,$P,$tmp1,$tmp2,$tmp3,$tmp4,0);
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| 92 | }
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| 93 | # &mov($tmp1,&wparam(0)); In last loop
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| 94 | &mov($tmp4,&DWP(0,$P,"",0));
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| 95 | }
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| 96 |
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| 97 | &xor($R,$tmp4);
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| 98 | &mov(&DWP(4,$tmp1,"",0),$L);
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| 99 |
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| 100 | &mov(&DWP(0,$tmp1,"",0),$R);
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| 101 | &function_end($name);
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| 102 | }
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| 103 |
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| 104 | sub BF_ENCRYPT
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| 105 | {
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| 106 | local($i,$L,$R,$P,$tmp1,$tmp2,$tmp3,$tmp4,$enc)=@_;
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| 107 |
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| 108 | &mov( $tmp4, &DWP(&n2a($i*4),$P,"",0)); # for next round
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| 109 |
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| 110 | &mov( $tmp2, $R);
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| 111 | &xor( $L, $tmp4);
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| 112 |
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| 113 | &shr( $tmp2, 16);
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| 114 | &mov( $tmp4, $R);
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| 115 |
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| 116 | &movb( &LB($tmp1), &HB($tmp2)); # A
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| 117 | &and( $tmp2, 0xff); # B
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| 118 |
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| 119 | &movb( &LB($tmp3), &HB($tmp4)); # C
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| 120 | &and( $tmp4, 0xff); # D
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| 121 |
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| 122 | &mov( $tmp1, &DWP(&n2a($BF_OFF+0x0000),$P,$tmp1,4));
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| 123 | &mov( $tmp2, &DWP(&n2a($BF_OFF+0x0400),$P,$tmp2,4));
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| 124 |
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| 125 | &add( $tmp2, $tmp1);
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| 126 | &mov( $tmp1, &DWP(&n2a($BF_OFF+0x0800),$P,$tmp3,4));
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| 127 |
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| 128 | &xor( $tmp2, $tmp1);
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| 129 | &mov( $tmp4, &DWP(&n2a($BF_OFF+0x0C00),$P,$tmp4,4));
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| 130 |
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| 131 | &add( $tmp2, $tmp4);
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| 132 | if (($enc && ($i != 16)) || ((!$enc) && ($i != 1)))
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| 133 | { &xor( $tmp1, $tmp1); }
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| 134 | else
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| 135 | {
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| 136 | &comment("Load parameter 0 ($i) enc=$enc");
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| 137 | &mov($tmp1,&wparam(0));
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| 138 | } # In last loop
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| 139 |
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| 140 | &xor( $L, $tmp2);
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| 141 | # delay
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| 142 | }
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| 143 |
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| 144 | sub n2a
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| 145 | {
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| 146 | sprintf("%d",$_[0]);
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| 147 | }
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| 148 |
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