1#!/usr/local/bin/perl 2 3$prog="des686.pl"; 4 5# base code is in microsft 6# op dest, source 7# format. 8# 9 10# WILL NOT WORK ANYMORE WITH desboth.pl 11require "desboth.pl"; 12 13if ( ($ARGV[0] eq "elf")) 14 { require "x86unix.pl"; } 15elsif ( ($ARGV[0] eq "a.out")) 16 { $aout=1; require "x86unix.pl"; } 17elsif ( ($ARGV[0] eq "sol")) 18 { $sol=1; require "x86unix.pl"; } 19elsif ( ($ARGV[0] eq "cpp")) 20 { $cpp=1; require "x86unix.pl"; } 21elsif ( ($ARGV[0] eq "win32")) 22 { require "x86ms.pl"; } 23else 24 { 25 print STDERR <<"EOF"; 26Pick one target type from 27 elf - linux, FreeBSD etc 28 a.out - old linux 29 sol - x86 solaris 30 cpp - format so x86unix.cpp can be used 31 win32 - Windows 95/Windows NT 32EOF 33 exit(1); 34 } 35 36&comment("Don't even think of reading this code"); 37&comment("It was automatically generated by $prog"); 38&comment("Which is a perl program used to generate the x86 assember for"); 39&comment("any of elf, a.out, Win32, or Solaris"); 40&comment("It can be found in SSLeay 0.6.5+ or in libdes 3.26+"); 41&comment("eric <eay\@cryptsoft.com>"); 42&comment(""); 43 44&file("dx86xxxx"); 45 46$L="edi"; 47$R="esi"; 48 49&DES_encrypt("DES_encrypt1",1); 50&DES_encrypt("DES_encrypt2",0); 51 52&DES_encrypt3("DES_encrypt3",1); 53&DES_encrypt3("DES_decrypt3",0); 54 55&file_end(); 56 57sub DES_encrypt 58 { 59 local($name,$do_ip)=@_; 60 61 &function_begin($name,"EXTRN _DES_SPtrans:DWORD"); 62 63 &comment(""); 64 &comment("Load the 2 words"); 65 &mov("eax",&wparam(0)); 66 &mov($L,&DWP(0,"eax","",0)); 67 &mov($R,&DWP(4,"eax","",0)); 68 69 $ksp=&wparam(1); 70 71 if ($do_ip) 72 { 73 &comment(""); 74 &comment("IP"); 75 &IP_new($L,$R,"eax"); 76 } 77 78 &comment(""); 79 &comment("fixup rotate"); 80 &rotl($R,3); 81 &rotl($L,3); 82 &exch($L,$R); 83 84 &comment(""); 85 &comment("load counter, key_schedule and enc flag"); 86 &mov("eax",&wparam(2)); # get encrypt flag 87 &mov("ebp",&wparam(1)); # get ks 88 &cmp("eax","0"); 89 &je(&label("start_decrypt")); 90 91 # encrypting part 92 93 for ($i=0; $i<16; $i+=2) 94 { 95 &comment(""); 96 &comment("Round $i"); 97 &D_ENCRYPT($L,$R,$i*2,"ebp","DES_SPtrans","ecx","edx","eax","ebx"); 98 99 &comment(""); 100 &comment("Round ".sprintf("%d",$i+1)); 101 &D_ENCRYPT($R,$L,($i+1)*2,"ebp","DES_SPtrans","ecx","edx","eax","ebx"); 102 } 103 &jmp(&label("end")); 104 105 &set_label("start_decrypt"); 106 107 for ($i=15; $i>0; $i-=2) 108 { 109 &comment(""); 110 &comment("Round $i"); 111 &D_ENCRYPT($L,$R,$i*2,"ebp","DES_SPtrans","ecx","edx","eax","ebx"); 112 &comment(""); 113 &comment("Round ".sprintf("%d",$i-1)); 114 &D_ENCRYPT($R,$L,($i-1)*2,"ebp","DES_SPtrans","ecx","edx","eax","ebx"); 115 } 116 117 &set_label("end"); 118 119 &comment(""); 120 &comment("Fixup"); 121 &rotr($L,3); # r 122 &rotr($R,3); # l 123 124 if ($do_ip) 125 { 126 &comment(""); 127 &comment("FP"); 128 &FP_new($R,$L,"eax"); 129 } 130 131 &mov("eax",&wparam(0)); 132 &mov(&DWP(0,"eax","",0),$L); 133 &mov(&DWP(4,"eax","",0),$R); 134 135 &function_end($name); 136 } 137 138 139# The logic is to load R into 2 registers and operate on both at the same time. 140# We also load the 2 R's into 2 more registers so we can do the 'move word down a byte' 141# while also masking the other copy and doing a lookup. We then also accumulate the 142# L value in 2 registers then combine them at the end. 143sub D_ENCRYPT 144 { 145 local($L,$R,$S,$ks,$desSP,$u,$t,$tmp1,$tmp2,$tmp3)=@_; 146 147 &mov( $u, &DWP(&n2a($S*4),$ks,"",0)); 148 &mov( $t, &DWP(&n2a(($S+1)*4),$ks,"",0)); 149 &xor( $u, $R ); 150 &xor( $t, $R ); 151 &rotr( $t, 4 ); 152 153 # the numbers at the end of the line are origional instruction order 154 &mov( $tmp2, $u ); # 1 2 155 &mov( $tmp1, $t ); # 1 1 156 &and( $tmp2, "0xfc" ); # 1 4 157 &and( $tmp1, "0xfc" ); # 1 3 158 &shr( $t, 8 ); # 1 5 159 &xor( $L, &DWP("0x100+$desSP",$tmp1,"",0)); # 1 7 160 &shr( $u, 8 ); # 1 6 161 &mov( $tmp1, &DWP(" $desSP",$tmp2,"",0)); # 1 8 162 163 &mov( $tmp2, $u ); # 2 2 164 &xor( $L, $tmp1 ); # 1 9 165 &and( $tmp2, "0xfc" ); # 2 4 166 &mov( $tmp1, $t ); # 2 1 167 &and( $tmp1, "0xfc" ); # 2 3 168 &shr( $t, 8 ); # 2 5 169 &xor( $L, &DWP("0x300+$desSP",$tmp1,"",0)); # 2 7 170 &shr( $u, 8 ); # 2 6 171 &mov( $tmp1, &DWP("0x200+$desSP",$tmp2,"",0)); # 2 8 172 &mov( $tmp2, $u ); # 3 2 173 174 &xor( $L, $tmp1 ); # 2 9 175 &and( $tmp2, "0xfc" ); # 3 4 176 177 &mov( $tmp1, $t ); # 3 1 178 &shr( $u, 8 ); # 3 6 179 &and( $tmp1, "0xfc" ); # 3 3 180 &shr( $t, 8 ); # 3 5 181 &xor( $L, &DWP("0x500+$desSP",$tmp1,"",0)); # 3 7 182 &mov( $tmp1, &DWP("0x400+$desSP",$tmp2,"",0)); # 3 8 183 184 &and( $t, "0xfc" ); # 4 1 185 &xor( $L, $tmp1 ); # 3 9 186 187 &and( $u, "0xfc" ); # 4 2 188 &xor( $L, &DWP("0x700+$desSP",$t,"",0)); # 4 3 189 &xor( $L, &DWP("0x600+$desSP",$u,"",0)); # 4 4 190 } 191 192sub PERM_OP 193 { 194 local($a,$b,$tt,$shift,$mask)=@_; 195 196 &mov( $tt, $a ); 197 &shr( $tt, $shift ); 198 &xor( $tt, $b ); 199 &and( $tt, $mask ); 200 &xor( $b, $tt ); 201 &shl( $tt, $shift ); 202 &xor( $a, $tt ); 203 } 204 205sub IP_new 206 { 207 local($l,$r,$tt)=@_; 208 209 &PERM_OP($r,$l,$tt, 4,"0x0f0f0f0f"); 210 &PERM_OP($l,$r,$tt,16,"0x0000ffff"); 211 &PERM_OP($r,$l,$tt, 2,"0x33333333"); 212 &PERM_OP($l,$r,$tt, 8,"0x00ff00ff"); 213 &PERM_OP($r,$l,$tt, 1,"0x55555555"); 214 } 215 216sub FP_new 217 { 218 local($l,$r,$tt)=@_; 219 220 &PERM_OP($l,$r,$tt, 1,"0x55555555"); 221 &PERM_OP($r,$l,$tt, 8,"0x00ff00ff"); 222 &PERM_OP($l,$r,$tt, 2,"0x33333333"); 223 &PERM_OP($r,$l,$tt,16,"0x0000ffff"); 224 &PERM_OP($l,$r,$tt, 4,"0x0f0f0f0f"); 225 } 226 227sub n2a 228 { 229 sprintf("%d",$_[0]); 230 } 231