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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 | |
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