| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame] | 1 | #! /usr/bin/env perl |
| 2 | # Copyright 1995-2020 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]); |
| 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 or die "error closing 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 | |