| 1 | #! /usr/bin/env perl
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| 2 | # Copyright 2005-2020 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 |
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| 10 | # ====================================================================
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| 11 | # Written by Andy Polyakov <[email protected]> for the OpenSSL
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| 12 | # project. The module is, however, dual licensed under OpenSSL and
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| 13 | # CRYPTOGAMS licenses depending on where you obtain it. For further
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| 14 | # details see http://www.openssl.org/~appro/cryptogams/.
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| 15 | # ====================================================================
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| 16 |
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| 17 | # October 2005
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| 18 | #
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| 19 | # This is a "teaser" code, as it can be improved in several ways...
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| 20 | # First of all non-SSE2 path should be implemented (yes, for now it
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| 21 | # performs Montgomery multiplication/convolution only on SSE2-capable
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| 22 | # CPUs such as P4, others fall down to original code). Then inner loop
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| 23 | # can be unrolled and modulo-scheduled to improve ILP and possibly
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| 24 | # moved to 128-bit XMM register bank (though it would require input
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| 25 | # rearrangement and/or increase bus bandwidth utilization). Dedicated
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| 26 | # squaring procedure should give further performance improvement...
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| 27 | # Yet, for being draft, the code improves rsa512 *sign* benchmark by
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| 28 | # 110%(!), rsa1024 one - by 70% and rsa4096 - by 20%:-)
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| 29 |
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| 30 | # December 2006
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| 31 | #
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| 32 | # Modulo-scheduling SSE2 loops results in further 15-20% improvement.
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| 33 | # Integer-only code [being equipped with dedicated squaring procedure]
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| 34 | # gives ~40% on rsa512 sign benchmark...
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| 35 |
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| 36 | $0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
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| 37 | push(@INC,"${dir}","${dir}../../perlasm");
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| 38 | require "x86asm.pl";
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| 39 |
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| 40 | $output = pop;
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| 41 | open STDOUT,">$output";
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| 42 |
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| 43 | &asm_init($ARGV[0]);
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| 44 |
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| 45 | $sse2=0;
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| 46 | for (@ARGV) { $sse2=1 if (/-DOPENSSL_IA32_SSE2/); }
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| 47 |
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| 48 | &external_label("OPENSSL_ia32cap_P") if ($sse2);
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| 49 |
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| 50 | &function_begin("bn_mul_mont");
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| 51 |
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| 52 | $i="edx";
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| 53 | $j="ecx";
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| 54 | $ap="esi"; $tp="esi"; # overlapping variables!!!
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| 55 | $rp="edi"; $bp="edi"; # overlapping variables!!!
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| 56 | $np="ebp";
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| 57 | $num="ebx";
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| 58 |
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| 59 | $_num=&DWP(4*0,"esp"); # stack top layout
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| 60 | $_rp=&DWP(4*1,"esp");
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| 61 | $_ap=&DWP(4*2,"esp");
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| 62 | $_bp=&DWP(4*3,"esp");
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| 63 | $_np=&DWP(4*4,"esp");
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| 64 | $_n0=&DWP(4*5,"esp"); $_n0q=&QWP(4*5,"esp");
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| 65 | $_sp=&DWP(4*6,"esp");
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| 66 | $_bpend=&DWP(4*7,"esp");
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| 67 | $frame=32; # size of above frame rounded up to 16n
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| 68 |
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| 69 | &xor ("eax","eax");
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| 70 | &mov ("edi",&wparam(5)); # int num
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| 71 | &cmp ("edi",4);
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| 72 | &jl (&label("just_leave"));
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| 73 |
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| 74 | &lea ("esi",&wparam(0)); # put aside pointer to argument block
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| 75 | &lea ("edx",&wparam(1)); # load ap
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| 76 | &add ("edi",2); # extra two words on top of tp
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| 77 | &neg ("edi");
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| 78 | &lea ("ebp",&DWP(-$frame,"esp","edi",4)); # future alloca($frame+4*(num+2))
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| 79 | &neg ("edi");
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| 80 |
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| 81 | # minimize cache contention by arranging 2K window between stack
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| 82 | # pointer and ap argument [np is also position sensitive vector,
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| 83 | # but it's assumed to be near ap, as it's allocated at ~same
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| 84 | # time].
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| 85 | &mov ("eax","ebp");
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| 86 | &sub ("eax","edx");
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| 87 | &and ("eax",2047);
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| 88 | &sub ("ebp","eax"); # this aligns sp and ap modulo 2048
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| 89 |
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| 90 | &xor ("edx","ebp");
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| 91 | &and ("edx",2048);
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| 92 | &xor ("edx",2048);
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| 93 | &sub ("ebp","edx"); # this splits them apart modulo 4096
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| 94 |
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| 95 | &and ("ebp",-64); # align to cache line
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| 96 |
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| 97 | # An OS-agnostic version of __chkstk.
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| 98 | #
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| 99 | # Some OSes (Windows) insist on stack being "wired" to
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| 100 | # physical memory in strictly sequential manner, i.e. if stack
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| 101 | # allocation spans two pages, then reference to farmost one can
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| 102 | # be punishable by SEGV. But page walking can do good even on
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| 103 | # other OSes, because it guarantees that villain thread hits
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| 104 | # the guard page before it can make damage to innocent one...
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| 105 | &mov ("eax","esp");
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| 106 | &sub ("eax","ebp");
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| 107 | &and ("eax",-4096);
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| 108 | &mov ("edx","esp"); # saved stack pointer!
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| 109 | &lea ("esp",&DWP(0,"ebp","eax"));
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| 110 | &mov ("eax",&DWP(0,"esp"));
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| 111 | &cmp ("esp","ebp");
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| 112 | &ja (&label("page_walk"));
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| 113 | &jmp (&label("page_walk_done"));
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| 114 |
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| 115 | &set_label("page_walk",16);
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| 116 | &lea ("esp",&DWP(-4096,"esp"));
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| 117 | &mov ("eax",&DWP(0,"esp"));
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| 118 | &cmp ("esp","ebp");
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| 119 | &ja (&label("page_walk"));
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| 120 | &set_label("page_walk_done");
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| 121 |
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| 122 | ################################# load argument block...
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| 123 | &mov ("eax",&DWP(0*4,"esi"));# BN_ULONG *rp
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| 124 | &mov ("ebx",&DWP(1*4,"esi"));# const BN_ULONG *ap
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| 125 | &mov ("ecx",&DWP(2*4,"esi"));# const BN_ULONG *bp
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| 126 | &mov ("ebp",&DWP(3*4,"esi"));# const BN_ULONG *np
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| 127 | &mov ("esi",&DWP(4*4,"esi"));# const BN_ULONG *n0
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| 128 | #&mov ("edi",&DWP(5*4,"esi"));# int num
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| 129 |
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| 130 | &mov ("esi",&DWP(0,"esi")); # pull n0[0]
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| 131 | &mov ($_rp,"eax"); # ... save a copy of argument block
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| 132 | &mov ($_ap,"ebx");
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| 133 | &mov ($_bp,"ecx");
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| 134 | &mov ($_np,"ebp");
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| 135 | &mov ($_n0,"esi");
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| 136 | &lea ($num,&DWP(-3,"edi")); # num=num-1 to assist modulo-scheduling
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| 137 | #&mov ($_num,$num); # redundant as $num is not reused
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| 138 | &mov ($_sp,"edx"); # saved stack pointer!
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| 139 | |
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| 140 |
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| 141 | if($sse2) {
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| 142 | $acc0="mm0"; # mmx register bank layout
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| 143 | $acc1="mm1";
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| 144 | $car0="mm2";
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| 145 | $car1="mm3";
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| 146 | $mul0="mm4";
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| 147 | $mul1="mm5";
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| 148 | $temp="mm6";
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| 149 | $mask="mm7";
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| 150 |
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| 151 | &picmeup("eax","OPENSSL_ia32cap_P");
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| 152 | &bt (&DWP(0,"eax"),26);
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| 153 | &jnc (&label("non_sse2"));
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| 154 |
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| 155 | &mov ("eax",-1);
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| 156 | &movd ($mask,"eax"); # mask 32 lower bits
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| 157 |
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| 158 | &mov ($ap,$_ap); # load input pointers
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| 159 | &mov ($bp,$_bp);
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| 160 | &mov ($np,$_np);
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| 161 |
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| 162 | &xor ($i,$i); # i=0
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| 163 | &xor ($j,$j); # j=0
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| 164 |
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| 165 | &movd ($mul0,&DWP(0,$bp)); # bp[0]
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| 166 | &movd ($mul1,&DWP(0,$ap)); # ap[0]
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| 167 | &movd ($car1,&DWP(0,$np)); # np[0]
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| 168 |
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| 169 | &pmuludq($mul1,$mul0); # ap[0]*bp[0]
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| 170 | &movq ($car0,$mul1);
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| 171 | &movq ($acc0,$mul1); # I wish movd worked for
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| 172 | &pand ($acc0,$mask); # inter-register transfers
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| 173 |
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| 174 | &pmuludq($mul1,$_n0q); # *=n0
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| 175 |
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| 176 | &pmuludq($car1,$mul1); # "t[0]"*np[0]*n0
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| 177 | &paddq ($car1,$acc0);
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| 178 |
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| 179 | &movd ($acc1,&DWP(4,$np)); # np[1]
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| 180 | &movd ($acc0,&DWP(4,$ap)); # ap[1]
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| 181 |
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| 182 | &psrlq ($car0,32);
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| 183 | &psrlq ($car1,32);
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| 184 |
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| 185 | &inc ($j); # j++
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| 186 | &set_label("1st",16);
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| 187 | &pmuludq($acc0,$mul0); # ap[j]*bp[0]
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| 188 | &pmuludq($acc1,$mul1); # np[j]*m1
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| 189 | &paddq ($car0,$acc0); # +=c0
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| 190 | &paddq ($car1,$acc1); # +=c1
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| 191 |
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| 192 | &movq ($acc0,$car0);
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| 193 | &pand ($acc0,$mask);
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| 194 | &movd ($acc1,&DWP(4,$np,$j,4)); # np[j+1]
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| 195 | &paddq ($car1,$acc0); # +=ap[j]*bp[0];
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| 196 | &movd ($acc0,&DWP(4,$ap,$j,4)); # ap[j+1]
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| 197 | &psrlq ($car0,32);
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| 198 | &movd (&DWP($frame-4,"esp",$j,4),$car1); # tp[j-1]=
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| 199 | &psrlq ($car1,32);
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| 200 |
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| 201 | &lea ($j,&DWP(1,$j));
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| 202 | &cmp ($j,$num);
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| 203 | &jl (&label("1st"));
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| 204 |
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| 205 | &pmuludq($acc0,$mul0); # ap[num-1]*bp[0]
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| 206 | &pmuludq($acc1,$mul1); # np[num-1]*m1
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| 207 | &paddq ($car0,$acc0); # +=c0
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| 208 | &paddq ($car1,$acc1); # +=c1
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| 209 |
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| 210 | &movq ($acc0,$car0);
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| 211 | &pand ($acc0,$mask);
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| 212 | &paddq ($car1,$acc0); # +=ap[num-1]*bp[0];
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| 213 | &movd (&DWP($frame-4,"esp",$j,4),$car1); # tp[num-2]=
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| 214 |
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| 215 | &psrlq ($car0,32);
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| 216 | &psrlq ($car1,32);
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| 217 |
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| 218 | &paddq ($car1,$car0);
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| 219 | &movq (&QWP($frame,"esp",$num,4),$car1); # tp[num].tp[num-1]
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| 220 | |
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| 221 |
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| 222 | &inc ($i); # i++
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| 223 | &set_label("outer");
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| 224 | &xor ($j,$j); # j=0
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| 225 |
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| 226 | &movd ($mul0,&DWP(0,$bp,$i,4)); # bp[i]
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| 227 | &movd ($mul1,&DWP(0,$ap)); # ap[0]
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| 228 | &movd ($temp,&DWP($frame,"esp")); # tp[0]
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| 229 | &movd ($car1,&DWP(0,$np)); # np[0]
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| 230 | &pmuludq($mul1,$mul0); # ap[0]*bp[i]
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| 231 |
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| 232 | &paddq ($mul1,$temp); # +=tp[0]
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| 233 | &movq ($acc0,$mul1);
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| 234 | &movq ($car0,$mul1);
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| 235 | &pand ($acc0,$mask);
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| 236 |
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| 237 | &pmuludq($mul1,$_n0q); # *=n0
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| 238 |
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| 239 | &pmuludq($car1,$mul1);
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| 240 | &paddq ($car1,$acc0);
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| 241 |
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| 242 | &movd ($temp,&DWP($frame+4,"esp")); # tp[1]
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| 243 | &movd ($acc1,&DWP(4,$np)); # np[1]
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| 244 | &movd ($acc0,&DWP(4,$ap)); # ap[1]
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| 245 |
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| 246 | &psrlq ($car0,32);
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| 247 | &psrlq ($car1,32);
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| 248 | &paddq ($car0,$temp); # +=tp[1]
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| 249 |
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| 250 | &inc ($j); # j++
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| 251 | &dec ($num);
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| 252 | &set_label("inner");
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| 253 | &pmuludq($acc0,$mul0); # ap[j]*bp[i]
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| 254 | &pmuludq($acc1,$mul1); # np[j]*m1
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| 255 | &paddq ($car0,$acc0); # +=c0
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| 256 | &paddq ($car1,$acc1); # +=c1
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| 257 |
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| 258 | &movq ($acc0,$car0);
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| 259 | &movd ($temp,&DWP($frame+4,"esp",$j,4));# tp[j+1]
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| 260 | &pand ($acc0,$mask);
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| 261 | &movd ($acc1,&DWP(4,$np,$j,4)); # np[j+1]
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| 262 | &paddq ($car1,$acc0); # +=ap[j]*bp[i]+tp[j]
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| 263 | &movd ($acc0,&DWP(4,$ap,$j,4)); # ap[j+1]
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| 264 | &psrlq ($car0,32);
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| 265 | &movd (&DWP($frame-4,"esp",$j,4),$car1);# tp[j-1]=
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| 266 | &psrlq ($car1,32);
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| 267 | &paddq ($car0,$temp); # +=tp[j+1]
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| 268 |
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| 269 | &dec ($num);
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| 270 | &lea ($j,&DWP(1,$j)); # j++
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| 271 | &jnz (&label("inner"));
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| 272 |
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| 273 | &mov ($num,$j);
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| 274 | &pmuludq($acc0,$mul0); # ap[num-1]*bp[i]
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| 275 | &pmuludq($acc1,$mul1); # np[num-1]*m1
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| 276 | &paddq ($car0,$acc0); # +=c0
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| 277 | &paddq ($car1,$acc1); # +=c1
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| 278 |
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| 279 | &movq ($acc0,$car0);
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| 280 | &pand ($acc0,$mask);
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| 281 | &paddq ($car1,$acc0); # +=ap[num-1]*bp[i]+tp[num-1]
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| 282 | &movd (&DWP($frame-4,"esp",$j,4),$car1); # tp[num-2]=
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| 283 | &psrlq ($car0,32);
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| 284 | &psrlq ($car1,32);
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| 285 |
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| 286 | &movd ($temp,&DWP($frame+4,"esp",$num,4)); # += tp[num]
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| 287 | &paddq ($car1,$car0);
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| 288 | &paddq ($car1,$temp);
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| 289 | &movq (&QWP($frame,"esp",$num,4),$car1); # tp[num].tp[num-1]
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| 290 |
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| 291 | &lea ($i,&DWP(1,$i)); # i++
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| 292 | &cmp ($i,$num);
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| 293 | &jle (&label("outer"));
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| 294 |
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| 295 | &emms (); # done with mmx bank
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| 296 | &jmp (&label("common_tail"));
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| 297 |
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| 298 | &set_label("non_sse2",16);
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| 299 | }
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| 300 | |
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| 301 |
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| 302 | if (0) {
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| 303 | &mov ("esp",$_sp);
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| 304 | &xor ("eax","eax"); # signal "not fast enough [yet]"
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| 305 | &jmp (&label("just_leave"));
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| 306 | # While the below code provides competitive performance for
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| 307 | # all key lengths on modern Intel cores, it's still more
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| 308 | # than 10% slower for 4096-bit key elsewhere:-( "Competitive"
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| 309 | # means compared to the original integer-only assembler.
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| 310 | # 512-bit RSA sign is better by ~40%, but that's about all
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| 311 | # one can say about all CPUs...
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| 312 | } else {
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| 313 | $inp="esi"; # integer path uses these registers differently
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| 314 | $word="edi";
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| 315 | $carry="ebp";
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| 316 |
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| 317 | &mov ($inp,$_ap);
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| 318 | &lea ($carry,&DWP(1,$num));
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| 319 | &mov ($word,$_bp);
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| 320 | &xor ($j,$j); # j=0
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| 321 | &mov ("edx",$inp);
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| 322 | &and ($carry,1); # see if num is even
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| 323 | &sub ("edx",$word); # see if ap==bp
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| 324 | &lea ("eax",&DWP(4,$word,$num,4)); # &bp[num]
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| 325 | &or ($carry,"edx");
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| 326 | &mov ($word,&DWP(0,$word)); # bp[0]
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| 327 | &jz (&label("bn_sqr_mont"));
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| 328 | &mov ($_bpend,"eax");
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| 329 | &mov ("eax",&DWP(0,$inp));
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| 330 | &xor ("edx","edx");
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| 331 |
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| 332 | &set_label("mull",16);
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| 333 | &mov ($carry,"edx");
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| 334 | &mul ($word); # ap[j]*bp[0]
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| 335 | &add ($carry,"eax");
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| 336 | &lea ($j,&DWP(1,$j));
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| 337 | &adc ("edx",0);
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| 338 | &mov ("eax",&DWP(0,$inp,$j,4)); # ap[j+1]
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| 339 | &cmp ($j,$num);
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| 340 | &mov (&DWP($frame-4,"esp",$j,4),$carry); # tp[j]=
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| 341 | &jl (&label("mull"));
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| 342 |
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| 343 | &mov ($carry,"edx");
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| 344 | &mul ($word); # ap[num-1]*bp[0]
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| 345 | &mov ($word,$_n0);
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| 346 | &add ("eax",$carry);
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| 347 | &mov ($inp,$_np);
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| 348 | &adc ("edx",0);
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| 349 | &imul ($word,&DWP($frame,"esp")); # n0*tp[0]
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| 350 |
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| 351 | &mov (&DWP($frame,"esp",$num,4),"eax"); # tp[num-1]=
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| 352 | &xor ($j,$j);
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| 353 | &mov (&DWP($frame+4,"esp",$num,4),"edx"); # tp[num]=
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| 354 | &mov (&DWP($frame+8,"esp",$num,4),$j); # tp[num+1]=
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| 355 |
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| 356 | &mov ("eax",&DWP(0,$inp)); # np[0]
|
|---|
| 357 | &mul ($word); # np[0]*m
|
|---|
| 358 | &add ("eax",&DWP($frame,"esp")); # +=tp[0]
|
|---|
| 359 | &mov ("eax",&DWP(4,$inp)); # np[1]
|
|---|
| 360 | &adc ("edx",0);
|
|---|
| 361 | &inc ($j);
|
|---|
| 362 |
|
|---|
| 363 | &jmp (&label("2ndmadd"));
|
|---|
| 364 | |
|---|
| 365 | |
|---|
| 366 |
|
|---|
| 367 | &set_label("1stmadd",16);
|
|---|
| 368 | &mov ($carry,"edx");
|
|---|
| 369 | &mul ($word); # ap[j]*bp[i]
|
|---|
| 370 | &add ($carry,&DWP($frame,"esp",$j,4)); # +=tp[j]
|
|---|
| 371 | &lea ($j,&DWP(1,$j));
|
|---|
| 372 | &adc ("edx",0);
|
|---|
| 373 | &add ($carry,"eax");
|
|---|
| 374 | &mov ("eax",&DWP(0,$inp,$j,4)); # ap[j+1]
|
|---|
| 375 | &adc ("edx",0);
|
|---|
| 376 | &cmp ($j,$num);
|
|---|
| 377 | &mov (&DWP($frame-4,"esp",$j,4),$carry); # tp[j]=
|
|---|
| 378 | &jl (&label("1stmadd"));
|
|---|
| 379 |
|
|---|
| 380 | &mov ($carry,"edx");
|
|---|
| 381 | &mul ($word); # ap[num-1]*bp[i]
|
|---|
| 382 | &add ("eax",&DWP($frame,"esp",$num,4)); # +=tp[num-1]
|
|---|
| 383 | &mov ($word,$_n0);
|
|---|
| 384 | &adc ("edx",0);
|
|---|
| 385 | &mov ($inp,$_np);
|
|---|
| 386 | &add ($carry,"eax");
|
|---|
| 387 | &adc ("edx",0);
|
|---|
| 388 | &imul ($word,&DWP($frame,"esp")); # n0*tp[0]
|
|---|
| 389 |
|
|---|
| 390 | &xor ($j,$j);
|
|---|
| 391 | &add ("edx",&DWP($frame+4,"esp",$num,4)); # carry+=tp[num]
|
|---|
| 392 | &mov (&DWP($frame,"esp",$num,4),$carry); # tp[num-1]=
|
|---|
| 393 | &adc ($j,0);
|
|---|
| 394 | &mov ("eax",&DWP(0,$inp)); # np[0]
|
|---|
| 395 | &mov (&DWP($frame+4,"esp",$num,4),"edx"); # tp[num]=
|
|---|
| 396 | &mov (&DWP($frame+8,"esp",$num,4),$j); # tp[num+1]=
|
|---|
| 397 |
|
|---|
| 398 | &mul ($word); # np[0]*m
|
|---|
| 399 | &add ("eax",&DWP($frame,"esp")); # +=tp[0]
|
|---|
| 400 | &mov ("eax",&DWP(4,$inp)); # np[1]
|
|---|
| 401 | &adc ("edx",0);
|
|---|
| 402 | &mov ($j,1);
|
|---|
| 403 | |
|---|
| 404 |
|
|---|
| 405 | &set_label("2ndmadd",16);
|
|---|
| 406 | &mov ($carry,"edx");
|
|---|
| 407 | &mul ($word); # np[j]*m
|
|---|
| 408 | &add ($carry,&DWP($frame,"esp",$j,4)); # +=tp[j]
|
|---|
| 409 | &lea ($j,&DWP(1,$j));
|
|---|
| 410 | &adc ("edx",0);
|
|---|
| 411 | &add ($carry,"eax");
|
|---|
| 412 | &mov ("eax",&DWP(0,$inp,$j,4)); # np[j+1]
|
|---|
| 413 | &adc ("edx",0);
|
|---|
| 414 | &cmp ($j,$num);
|
|---|
| 415 | &mov (&DWP($frame-8,"esp",$j,4),$carry); # tp[j-1]=
|
|---|
| 416 | &jl (&label("2ndmadd"));
|
|---|
| 417 |
|
|---|
| 418 | &mov ($carry,"edx");
|
|---|
| 419 | &mul ($word); # np[j]*m
|
|---|
| 420 | &add ($carry,&DWP($frame,"esp",$num,4)); # +=tp[num-1]
|
|---|
| 421 | &adc ("edx",0);
|
|---|
| 422 | &add ($carry,"eax");
|
|---|
| 423 | &adc ("edx",0);
|
|---|
| 424 | &mov (&DWP($frame-4,"esp",$num,4),$carry); # tp[num-2]=
|
|---|
| 425 |
|
|---|
| 426 | &xor ("eax","eax");
|
|---|
| 427 | &mov ($j,$_bp); # &bp[i]
|
|---|
| 428 | &add ("edx",&DWP($frame+4,"esp",$num,4)); # carry+=tp[num]
|
|---|
| 429 | &adc ("eax",&DWP($frame+8,"esp",$num,4)); # +=tp[num+1]
|
|---|
| 430 | &lea ($j,&DWP(4,$j));
|
|---|
| 431 | &mov (&DWP($frame,"esp",$num,4),"edx"); # tp[num-1]=
|
|---|
| 432 | &cmp ($j,$_bpend);
|
|---|
| 433 | &mov (&DWP($frame+4,"esp",$num,4),"eax"); # tp[num]=
|
|---|
| 434 | &je (&label("common_tail"));
|
|---|
| 435 |
|
|---|
| 436 | &mov ($word,&DWP(0,$j)); # bp[i+1]
|
|---|
| 437 | &mov ($inp,$_ap);
|
|---|
| 438 | &mov ($_bp,$j); # &bp[++i]
|
|---|
| 439 | &xor ($j,$j);
|
|---|
| 440 | &xor ("edx","edx");
|
|---|
| 441 | &mov ("eax",&DWP(0,$inp));
|
|---|
| 442 | &jmp (&label("1stmadd"));
|
|---|
| 443 | |
|---|
| 444 |
|
|---|
| 445 | &set_label("bn_sqr_mont",16);
|
|---|
| 446 | $sbit=$num;
|
|---|
| 447 | &mov ($_num,$num);
|
|---|
| 448 | &mov ($_bp,$j); # i=0
|
|---|
| 449 |
|
|---|
| 450 | &mov ("eax",$word); # ap[0]
|
|---|
| 451 | &mul ($word); # ap[0]*ap[0]
|
|---|
| 452 | &mov (&DWP($frame,"esp"),"eax"); # tp[0]=
|
|---|
| 453 | &mov ($sbit,"edx");
|
|---|
| 454 | &shr ("edx",1);
|
|---|
| 455 | &and ($sbit,1);
|
|---|
| 456 | &inc ($j);
|
|---|
| 457 | &set_label("sqr",16);
|
|---|
| 458 | &mov ("eax",&DWP(0,$inp,$j,4)); # ap[j]
|
|---|
| 459 | &mov ($carry,"edx");
|
|---|
| 460 | &mul ($word); # ap[j]*ap[0]
|
|---|
| 461 | &add ("eax",$carry);
|
|---|
| 462 | &lea ($j,&DWP(1,$j));
|
|---|
| 463 | &adc ("edx",0);
|
|---|
| 464 | &lea ($carry,&DWP(0,$sbit,"eax",2));
|
|---|
| 465 | &shr ("eax",31);
|
|---|
| 466 | &cmp ($j,$_num);
|
|---|
| 467 | &mov ($sbit,"eax");
|
|---|
| 468 | &mov (&DWP($frame-4,"esp",$j,4),$carry); # tp[j]=
|
|---|
| 469 | &jl (&label("sqr"));
|
|---|
| 470 |
|
|---|
| 471 | &mov ("eax",&DWP(0,$inp,$j,4)); # ap[num-1]
|
|---|
| 472 | &mov ($carry,"edx");
|
|---|
| 473 | &mul ($word); # ap[num-1]*ap[0]
|
|---|
| 474 | &add ("eax",$carry);
|
|---|
| 475 | &mov ($word,$_n0);
|
|---|
| 476 | &adc ("edx",0);
|
|---|
| 477 | &mov ($inp,$_np);
|
|---|
| 478 | &lea ($carry,&DWP(0,$sbit,"eax",2));
|
|---|
| 479 | &imul ($word,&DWP($frame,"esp")); # n0*tp[0]
|
|---|
| 480 | &shr ("eax",31);
|
|---|
| 481 | &mov (&DWP($frame,"esp",$j,4),$carry); # tp[num-1]=
|
|---|
| 482 |
|
|---|
| 483 | &lea ($carry,&DWP(0,"eax","edx",2));
|
|---|
| 484 | &mov ("eax",&DWP(0,$inp)); # np[0]
|
|---|
| 485 | &shr ("edx",31);
|
|---|
| 486 | &mov (&DWP($frame+4,"esp",$j,4),$carry); # tp[num]=
|
|---|
| 487 | &mov (&DWP($frame+8,"esp",$j,4),"edx"); # tp[num+1]=
|
|---|
| 488 |
|
|---|
| 489 | &mul ($word); # np[0]*m
|
|---|
| 490 | &add ("eax",&DWP($frame,"esp")); # +=tp[0]
|
|---|
| 491 | &mov ($num,$j);
|
|---|
| 492 | &adc ("edx",0);
|
|---|
| 493 | &mov ("eax",&DWP(4,$inp)); # np[1]
|
|---|
| 494 | &mov ($j,1);
|
|---|
| 495 | |
|---|
| 496 | |
|---|
| 497 |
|
|---|
| 498 | &set_label("3rdmadd",16);
|
|---|
| 499 | &mov ($carry,"edx");
|
|---|
| 500 | &mul ($word); # np[j]*m
|
|---|
| 501 | &add ($carry,&DWP($frame,"esp",$j,4)); # +=tp[j]
|
|---|
| 502 | &adc ("edx",0);
|
|---|
| 503 | &add ($carry,"eax");
|
|---|
| 504 | &mov ("eax",&DWP(4,$inp,$j,4)); # np[j+1]
|
|---|
| 505 | &adc ("edx",0);
|
|---|
| 506 | &mov (&DWP($frame-4,"esp",$j,4),$carry); # tp[j-1]=
|
|---|
| 507 |
|
|---|
| 508 | &mov ($carry,"edx");
|
|---|
| 509 | &mul ($word); # np[j+1]*m
|
|---|
| 510 | &add ($carry,&DWP($frame+4,"esp",$j,4)); # +=tp[j+1]
|
|---|
| 511 | &lea ($j,&DWP(2,$j));
|
|---|
| 512 | &adc ("edx",0);
|
|---|
| 513 | &add ($carry,"eax");
|
|---|
| 514 | &mov ("eax",&DWP(0,$inp,$j,4)); # np[j+2]
|
|---|
| 515 | &adc ("edx",0);
|
|---|
| 516 | &cmp ($j,$num);
|
|---|
| 517 | &mov (&DWP($frame-8,"esp",$j,4),$carry); # tp[j]=
|
|---|
| 518 | &jl (&label("3rdmadd"));
|
|---|
| 519 |
|
|---|
| 520 | &mov ($carry,"edx");
|
|---|
| 521 | &mul ($word); # np[j]*m
|
|---|
| 522 | &add ($carry,&DWP($frame,"esp",$num,4)); # +=tp[num-1]
|
|---|
| 523 | &adc ("edx",0);
|
|---|
| 524 | &add ($carry,"eax");
|
|---|
| 525 | &adc ("edx",0);
|
|---|
| 526 | &mov (&DWP($frame-4,"esp",$num,4),$carry); # tp[num-2]=
|
|---|
| 527 |
|
|---|
| 528 | &mov ($j,$_bp); # i
|
|---|
| 529 | &xor ("eax","eax");
|
|---|
| 530 | &mov ($inp,$_ap);
|
|---|
| 531 | &add ("edx",&DWP($frame+4,"esp",$num,4)); # carry+=tp[num]
|
|---|
| 532 | &adc ("eax",&DWP($frame+8,"esp",$num,4)); # +=tp[num+1]
|
|---|
| 533 | &mov (&DWP($frame,"esp",$num,4),"edx"); # tp[num-1]=
|
|---|
| 534 | &cmp ($j,$num);
|
|---|
| 535 | &mov (&DWP($frame+4,"esp",$num,4),"eax"); # tp[num]=
|
|---|
| 536 | &je (&label("common_tail"));
|
|---|
| 537 | |
|---|
| 538 |
|
|---|
| 539 | &mov ($word,&DWP(4,$inp,$j,4)); # ap[i]
|
|---|
| 540 | &lea ($j,&DWP(1,$j));
|
|---|
| 541 | &mov ("eax",$word);
|
|---|
| 542 | &mov ($_bp,$j); # ++i
|
|---|
| 543 | &mul ($word); # ap[i]*ap[i]
|
|---|
| 544 | &add ("eax",&DWP($frame,"esp",$j,4)); # +=tp[i]
|
|---|
| 545 | &adc ("edx",0);
|
|---|
| 546 | &mov (&DWP($frame,"esp",$j,4),"eax"); # tp[i]=
|
|---|
| 547 | &xor ($carry,$carry);
|
|---|
| 548 | &cmp ($j,$num);
|
|---|
| 549 | &lea ($j,&DWP(1,$j));
|
|---|
| 550 | &je (&label("sqrlast"));
|
|---|
| 551 |
|
|---|
| 552 | &mov ($sbit,"edx"); # zaps $num
|
|---|
| 553 | &shr ("edx",1);
|
|---|
| 554 | &and ($sbit,1);
|
|---|
| 555 | &set_label("sqradd",16);
|
|---|
| 556 | &mov ("eax",&DWP(0,$inp,$j,4)); # ap[j]
|
|---|
| 557 | &mov ($carry,"edx");
|
|---|
| 558 | &mul ($word); # ap[j]*ap[i]
|
|---|
| 559 | &add ("eax",$carry);
|
|---|
| 560 | &lea ($carry,&DWP(0,"eax","eax"));
|
|---|
| 561 | &adc ("edx",0);
|
|---|
| 562 | &shr ("eax",31);
|
|---|
| 563 | &add ($carry,&DWP($frame,"esp",$j,4)); # +=tp[j]
|
|---|
| 564 | &lea ($j,&DWP(1,$j));
|
|---|
| 565 | &adc ("eax",0);
|
|---|
| 566 | &add ($carry,$sbit);
|
|---|
| 567 | &adc ("eax",0);
|
|---|
| 568 | &cmp ($j,$_num);
|
|---|
| 569 | &mov (&DWP($frame-4,"esp",$j,4),$carry); # tp[j]=
|
|---|
| 570 | &mov ($sbit,"eax");
|
|---|
| 571 | &jle (&label("sqradd"));
|
|---|
| 572 |
|
|---|
| 573 | &mov ($carry,"edx");
|
|---|
| 574 | &add ("edx","edx");
|
|---|
| 575 | &shr ($carry,31);
|
|---|
| 576 | &add ("edx",$sbit);
|
|---|
| 577 | &adc ($carry,0);
|
|---|
| 578 | &set_label("sqrlast");
|
|---|
| 579 | &mov ($word,$_n0);
|
|---|
| 580 | &mov ($inp,$_np);
|
|---|
| 581 | &imul ($word,&DWP($frame,"esp")); # n0*tp[0]
|
|---|
| 582 |
|
|---|
| 583 | &add ("edx",&DWP($frame,"esp",$j,4)); # +=tp[num]
|
|---|
| 584 | &mov ("eax",&DWP(0,$inp)); # np[0]
|
|---|
| 585 | &adc ($carry,0);
|
|---|
| 586 | &mov (&DWP($frame,"esp",$j,4),"edx"); # tp[num]=
|
|---|
| 587 | &mov (&DWP($frame+4,"esp",$j,4),$carry); # tp[num+1]=
|
|---|
| 588 |
|
|---|
| 589 | &mul ($word); # np[0]*m
|
|---|
| 590 | &add ("eax",&DWP($frame,"esp")); # +=tp[0]
|
|---|
| 591 | &lea ($num,&DWP(-1,$j));
|
|---|
| 592 | &adc ("edx",0);
|
|---|
| 593 | &mov ($j,1);
|
|---|
| 594 | &mov ("eax",&DWP(4,$inp)); # np[1]
|
|---|
| 595 |
|
|---|
| 596 | &jmp (&label("3rdmadd"));
|
|---|
| 597 | }
|
|---|
| 598 | |
|---|
| 599 |
|
|---|
| 600 | &set_label("common_tail",16);
|
|---|
| 601 | &mov ($np,$_np); # load modulus pointer
|
|---|
| 602 | &mov ($rp,$_rp); # load result pointer
|
|---|
| 603 | &lea ($tp,&DWP($frame,"esp")); # [$ap and $bp are zapped]
|
|---|
| 604 |
|
|---|
| 605 | &mov ("eax",&DWP(0,$tp)); # tp[0]
|
|---|
| 606 | &mov ($j,$num); # j=num-1
|
|---|
| 607 | &xor ($i,$i); # i=0 and clear CF!
|
|---|
| 608 |
|
|---|
| 609 | &set_label("sub",16);
|
|---|
| 610 | &sbb ("eax",&DWP(0,$np,$i,4));
|
|---|
| 611 | &mov (&DWP(0,$rp,$i,4),"eax"); # rp[i]=tp[i]-np[i]
|
|---|
| 612 | &dec ($j); # doesn't affect CF!
|
|---|
| 613 | &mov ("eax",&DWP(4,$tp,$i,4)); # tp[i+1]
|
|---|
| 614 | &lea ($i,&DWP(1,$i)); # i++
|
|---|
| 615 | &jge (&label("sub"));
|
|---|
| 616 |
|
|---|
| 617 | &sbb ("eax",0); # handle upmost overflow bit
|
|---|
| 618 | &mov ("edx",-1);
|
|---|
| 619 | &xor ("edx","eax");
|
|---|
| 620 | &jmp (&label("copy"));
|
|---|
| 621 |
|
|---|
| 622 | &set_label("copy",16); # conditional copy
|
|---|
| 623 | &mov ($tp,&DWP($frame,"esp",$num,4));
|
|---|
| 624 | &mov ($np,&DWP(0,$rp,$num,4));
|
|---|
| 625 | &mov (&DWP($frame,"esp",$num,4),$j); # zap temporary vector
|
|---|
| 626 | &and ($tp,"eax");
|
|---|
| 627 | &and ($np,"edx");
|
|---|
| 628 | &or ($np,$tp);
|
|---|
| 629 | &mov (&DWP(0,$rp,$num,4),$np);
|
|---|
| 630 | &dec ($num);
|
|---|
| 631 | &jge (&label("copy"));
|
|---|
| 632 |
|
|---|
| 633 | &mov ("esp",$_sp); # pull saved stack pointer
|
|---|
| 634 | &mov ("eax",1);
|
|---|
| 635 | &set_label("just_leave");
|
|---|
| 636 | &function_end("bn_mul_mont");
|
|---|
| 637 |
|
|---|
| 638 | &asciz("Montgomery Multiplication for x86, CRYPTOGAMS by <appro\@openssl.org>");
|
|---|
| 639 |
|
|---|
| 640 | &asm_finish();
|
|---|
| 641 |
|
|---|
| 642 | close STDOUT or die "error closing STDOUT: $!";
|
|---|
