crypto/rc5/asm/rc5-586.pl

   1 #! /usr/bin/env perl
   2 # Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
   3 #
   4 # Licensed under the OpenSSL license (the "License").  You may not use
   5 # this file except in compliance with the License.  You can obtain a copy
   6 # in the file LICENSE in the source distribution or at
   7 # https://www.openssl.org/source/license.html
   8
   9
  10 $0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
  11 push(@INC,"${dir}","${dir}../../perlasm");
  12 require "x86asm.pl";
  13 require "cbc.pl";
  14
  15 $output = pop;
  16 open STDOUT,">$output";
  17
  18 &asm_init($ARGV[0],"rc5-586.pl");
  19
  20 $RC5_MAX_ROUNDS=16;
  21 $RC5_32_OFF=($RC5_MAX_ROUNDS+2)*4;
  22 $A="edi";
  23 $B="esi";
  24 $S="ebp";
  25 $tmp1="eax";
  26 $r="ebx";
  27 $tmpc="ecx";
  28 $tmp4="edx";
  29
  30 &RC5_32_encrypt("RC5_32_encrypt",1);
  31 &RC5_32_encrypt("RC5_32_decrypt",0);
  32 &cbc("RC5_32_cbc_encrypt","RC5_32_encrypt","RC5_32_decrypt",0,4,5,3,-1,-1);
  33 &asm_finish();
  34
  35 close STDOUT;
  36
  37 sub RC5_32_encrypt
  38         {
  39         local($name,$enc)=@_;
  40
  41         &function_begin_B($name,"");
  42
  43         &comment("");
  44
  45         &push("ebp");
  46          &push("esi");
  47         &push("edi");
  48          &mov($tmp4,&wparam(0));
  49         &mov($S,&wparam(1));
  50
  51         &comment("Load the 2 words");
  52          &mov($A,&DWP(0,$tmp4,"",0));
  53         &mov($B,&DWP(4,$tmp4,"",0));
  54
  55         &push($r);
  56          &mov($r,       &DWP(0,$S,"",0));
  57
  58         # encrypting part
  59
  60         if ($enc)
  61                 {
  62                  &add($A,       &DWP(4+0,$S,"",0));
  63                 &add($B,        &DWP(4+4,$S,"",0));
  64
  65                 for ($i=0; $i<$RC5_MAX_ROUNDS; $i++)
  66                         {
  67                          &xor($A,       $B);
  68                         &mov($tmp1,     &DWP(12+$i*8,$S,"",0));
  69                          &mov($tmpc,    $B);
  70                         &rotl($A,       &LB("ecx"));
  71                         &add($A,        $tmp1);
  72
  73                          &xor($B,       $A);
  74                         &mov($tmp1,     &DWP(16+$i*8,$S,"",0));
  75                          &mov($tmpc,    $A);
  76                         &rotl($B,       &LB("ecx"));
  77                         &add($B,        $tmp1);
  78                         if (($i == 7) || ($i == 11))
  79                                 {
  80                          &cmp($r,       $i+1);
  81                         &je(&label("rc5_exit"));
  82                                 }
  83                         }
  84                 }
  85         else
  86                 {
  87                  &cmp($r,       12);
  88                 &je(&label("rc5_dec_12"));
  89                  &cmp($r,       8);
  90                 &je(&label("rc5_dec_8"));
  91                 for ($i=$RC5_MAX_ROUNDS; $i > 0; $i--)
  92                         {
  93                         &set_label("rc5_dec_$i") if ($i == 12) || ($i == 8);
  94                          &mov($tmp1,    &DWP($i*8+8,$S,"",0));
  95                         &sub($B,        $tmp1);
  96                          &mov($tmpc,    $A);
  97                         &rotr($B,       &LB("ecx"));
  98                         &xor($B,        $A);
  99
 100                          &mov($tmp1,    &DWP($i*8+4,$S,"",0));
 101                         &sub($A,        $tmp1);
 102                          &mov($tmpc,    $B);
 103                         &rotr($A,       &LB("ecx"));
 104                         &xor($A,        $B);
 105                         }
 106                  &sub($B,       &DWP(4+4,$S,"",0));
 107                 &sub($A,        &DWP(4+0,$S,"",0));
 108                 }
 109
 110         &set_label("rc5_exit");
 111          &mov(&DWP(0,$tmp4,"",0),$A);
 112         &mov(&DWP(4,$tmp4,"",0),$B);
 113
 114          &pop("ebx");
 115         &pop("edi");
 116          &pop("esi");
 117         &pop("ebp");
 118          &ret();
 119         &function_end_B($name);
 120         }
 121
 122