| 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 OpenSSL license (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 | # The inner loop instruction sequence and the IP/FP modifications are from
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| 10 | # Svend Olaf Mikkelsen
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| 11 |
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| 12 | $0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
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| 13 | push(@INC,"${dir}","${dir}../../perlasm");
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| 14 | require "x86asm.pl";
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| 15 |
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| 16 | $output=pop;
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| 17 | open STDOUT,">$output";
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| 18 |
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| 19 | &asm_init($ARGV[0]);
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| 20 |
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| 21 | $L="edi";
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| 22 | $R="esi";
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| 23 |
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| 24 | &external_label("DES_SPtrans");
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| 25 | &fcrypt_body("fcrypt_body");
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| 26 | &asm_finish();
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| 27 |
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| 28 | close STDOUT or die "error closing STDOUT: $!";
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| 29 |
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| 30 | sub fcrypt_body
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| 31 | {
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| 32 | local($name,$do_ip)=@_;
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| 33 |
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| 34 | &function_begin($name);
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| 35 |
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| 36 | &comment("");
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| 37 | &comment("Load the 2 words");
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| 38 | $trans="ebp";
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| 39 |
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| 40 | &xor( $L, $L);
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| 41 | &xor( $R, $R);
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| 42 |
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| 43 | # PIC-ification:-)
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| 44 | &picmeup("edx","DES_SPtrans");
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| 45 | #if ($cpp) { &picmeup("edx","DES_SPtrans"); }
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| 46 | #else { &lea("edx",&DWP("DES_SPtrans")); }
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| 47 | &push("edx"); # becomes &swtmp(1)
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| 48 | #
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| 49 | &mov($trans,&wparam(1)); # reloaded with DES_SPtrans in D_ENCRYPT
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| 50 |
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| 51 | &push(&DWC(25)); # add a variable
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| 52 |
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| 53 | &set_label("start");
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| 54 | for ($i=0; $i<16; $i+=2)
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| 55 | {
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| 56 | &comment("");
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| 57 | &comment("Round $i");
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| 58 | &D_ENCRYPT($i,$L,$R,$i*2,$trans,"eax","ebx","ecx","edx");
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| 59 |
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| 60 | &comment("");
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| 61 | &comment("Round ".sprintf("%d",$i+1));
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| 62 | &D_ENCRYPT($i+1,$R,$L,($i+1)*2,$trans,"eax","ebx","ecx","edx");
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| 63 | }
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| 64 | &mov("ebx", &swtmp(0));
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| 65 | &mov("eax", $L);
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| 66 | &dec("ebx");
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| 67 | &mov($L, $R);
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| 68 | &mov($R, "eax");
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| 69 | &mov(&swtmp(0), "ebx");
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| 70 | &jnz(&label("start"));
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| 71 |
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| 72 | &comment("");
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| 73 | &comment("FP");
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| 74 | &mov("edx",&wparam(0));
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| 75 |
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| 76 | &FP_new($R,$L,"eax",3);
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| 77 | &mov(&DWP(0,"edx","",0),"eax");
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| 78 | &mov(&DWP(4,"edx","",0),$L);
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| 79 |
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| 80 | &add("esp",8); # remove variables
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| 81 |
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| 82 | &function_end($name);
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| 83 | }
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| 84 |
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| 85 | sub D_ENCRYPT
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| 86 | {
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| 87 | local($r,$L,$R,$S,$trans,$u,$tmp1,$tmp2,$t)=@_;
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| 88 |
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| 89 | &mov( $u, &wparam(2)); # 2
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| 90 | &mov( $t, $R);
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| 91 | &shr( $t, 16); # 1
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| 92 | &mov( $tmp2, &wparam(3)); # 2
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| 93 | &xor( $t, $R); # 1
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| 94 |
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| 95 | &and( $u, $t); # 2
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| 96 | &and( $t, $tmp2); # 2
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| 97 |
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| 98 | &mov( $tmp1, $u);
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| 99 | &shl( $tmp1, 16); # 1
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| 100 | &mov( $tmp2, $t);
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| 101 | &shl( $tmp2, 16); # 1
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| 102 | &xor( $u, $tmp1); # 2
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| 103 | &xor( $t, $tmp2); # 2
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| 104 | &mov( $tmp1, &DWP(&n2a($S*4),$trans,"",0)); # 2
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| 105 | &xor( $u, $tmp1);
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| 106 | &mov( $tmp2, &DWP(&n2a(($S+1)*4),$trans,"",0)); # 2
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| 107 | &xor( $u, $R);
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| 108 | &xor( $t, $R);
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| 109 | &xor( $t, $tmp2);
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| 110 |
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| 111 | &and( $u, "0xfcfcfcfc" ); # 2
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| 112 | &xor( $tmp1, $tmp1); # 1
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| 113 | &and( $t, "0xcfcfcfcf" ); # 2
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| 114 | &xor( $tmp2, $tmp2);
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| 115 | &movb( &LB($tmp1), &LB($u) );
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| 116 | &movb( &LB($tmp2), &HB($u) );
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| 117 | &rotr( $t, 4 );
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| 118 | &mov( $trans, &swtmp(1));
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| 119 | &xor( $L, &DWP(" ",$trans,$tmp1,0));
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| 120 | &movb( &LB($tmp1), &LB($t) );
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| 121 | &xor( $L, &DWP("0x200",$trans,$tmp2,0));
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| 122 | &movb( &LB($tmp2), &HB($t) );
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| 123 | &shr( $u, 16);
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| 124 | &xor( $L, &DWP("0x100",$trans,$tmp1,0));
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| 125 | &movb( &LB($tmp1), &HB($u) );
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| 126 | &shr( $t, 16);
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| 127 | &xor( $L, &DWP("0x300",$trans,$tmp2,0));
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| 128 | &movb( &LB($tmp2), &HB($t) );
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| 129 | &and( $u, "0xff" );
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| 130 | &and( $t, "0xff" );
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| 131 | &mov( $tmp1, &DWP("0x600",$trans,$tmp1,0));
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| 132 | &xor( $L, $tmp1);
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| 133 | &mov( $tmp1, &DWP("0x700",$trans,$tmp2,0));
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| 134 | &xor( $L, $tmp1);
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| 135 | &mov( $tmp1, &DWP("0x400",$trans,$u,0));
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| 136 | &xor( $L, $tmp1);
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| 137 | &mov( $tmp1, &DWP("0x500",$trans,$t,0));
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| 138 | &xor( $L, $tmp1);
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| 139 | &mov( $trans, &wparam(1));
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| 140 | }
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| 141 |
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| 142 | sub n2a
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| 143 | {
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| 144 | sprintf("%d",$_[0]);
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| 145 | }
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| 146 |
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| 147 | # now has a side affect of rotating $a by $shift
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| 148 | sub R_PERM_OP
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| 149 | {
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| 150 | local($a,$b,$tt,$shift,$mask,$last)=@_;
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| 151 |
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| 152 | &rotl( $a, $shift ) if ($shift != 0);
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| 153 | &mov( $tt, $a );
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| 154 | &xor( $a, $b );
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| 155 | &and( $a, $mask );
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| 156 | if ($notlast eq $b)
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| 157 | {
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| 158 | &xor( $b, $a );
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| 159 | &xor( $tt, $a );
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| 160 | }
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| 161 | else
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| 162 | {
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| 163 | &xor( $tt, $a );
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| 164 | &xor( $b, $a );
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| 165 | }
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| 166 | &comment("");
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| 167 | }
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| 168 |
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| 169 | sub IP_new
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| 170 | {
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| 171 | local($l,$r,$tt,$lr)=@_;
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| 172 |
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| 173 | &R_PERM_OP($l,$r,$tt, 4,"0xf0f0f0f0",$l);
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| 174 | &R_PERM_OP($r,$tt,$l,20,"0xfff0000f",$l);
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| 175 | &R_PERM_OP($l,$tt,$r,14,"0x33333333",$r);
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| 176 | &R_PERM_OP($tt,$r,$l,22,"0x03fc03fc",$r);
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| 177 | &R_PERM_OP($l,$r,$tt, 9,"0xaaaaaaaa",$r);
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| 178 |
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| 179 | if ($lr != 3)
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| 180 | {
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| 181 | if (($lr-3) < 0)
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| 182 | { &rotr($tt, 3-$lr); }
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| 183 | else { &rotl($tt, $lr-3); }
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| 184 | }
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| 185 | if ($lr != 2)
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| 186 | {
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| 187 | if (($lr-2) < 0)
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| 188 | { &rotr($r, 2-$lr); }
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| 189 | else { &rotl($r, $lr-2); }
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| 190 | }
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| 191 | }
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| 192 |
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| 193 | sub FP_new
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| 194 | {
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| 195 | local($l,$r,$tt,$lr)=@_;
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| 196 |
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| 197 | if ($lr != 2)
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| 198 | {
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| 199 | if (($lr-2) < 0)
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| 200 | { &rotl($r, 2-$lr); }
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| 201 | else { &rotr($r, $lr-2); }
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| 202 | }
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| 203 | if ($lr != 3)
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| 204 | {
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| 205 | if (($lr-3) < 0)
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| 206 | { &rotl($l, 3-$lr); }
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| 207 | else { &rotr($l, $lr-3); }
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| 208 | }
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| 209 |
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| 210 | &R_PERM_OP($l,$r,$tt, 0,"0xaaaaaaaa",$r);
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| 211 | &R_PERM_OP($tt,$r,$l,23,"0x03fc03fc",$r);
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| 212 | &R_PERM_OP($l,$r,$tt,10,"0x33333333",$l);
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| 213 | &R_PERM_OP($r,$tt,$l,18,"0xfff0000f",$l);
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| 214 | &R_PERM_OP($l,$tt,$r,12,"0xf0f0f0f0",$r);
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| 215 | &rotr($tt , 4);
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| 216 | }
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| 217 |
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