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-#!/usr/bin/env perl
-#
-# ====================================================================
-# Written by Andy Polyakov <appro@fy.chalmers.se> for the OpenSSL
-# project. The module is, however, dual licensed under OpenSSL and
-# CRYPTOGAMS licenses depending on where you obtain it. For further
-# details see http://www.openssl.org/~appro/cryptogams/.
-# ====================================================================
-#
-# Wrapper around 'rep montmul', VIA-specific instruction accessing
-# PadLock Montgomery Multiplier. The wrapper is designed as drop-in
-# replacement for OpenSSL bn_mul_mont [first implemented in 0.9.9].
-#
-# Below are interleaved outputs from 'openssl speed rsa dsa' for 4
-# different software configurations on 1.5GHz VIA Esther processor.
-# Lines marked with "software integer" denote performance of hand-
-# coded integer-only assembler found in OpenSSL 0.9.7. "Software SSE2"
-# refers to hand-coded SSE2 Montgomery multiplication procedure found
-# OpenSSL 0.9.9. "Hardware VIA SDK" refers to padlock_pmm routine from
-# Padlock SDK 2.0.1 available for download from VIA, which naturally
-# utilizes the magic 'repz montmul' instruction. And finally "hardware
-# this" refers to *this* implementation which also uses 'repz montmul'
-#
-# sign verify sign/s verify/s
-# rsa 512 bits 0.001720s 0.000140s 581.4 7149.7 software integer
-# rsa 512 bits 0.000690s 0.000086s 1450.3 11606.0 software SSE2
-# rsa 512 bits 0.006136s 0.000201s 163.0 4974.5 hardware VIA SDK
-# rsa 512 bits 0.000712s 0.000050s 1404.9 19858.5 hardware this
-#
-# rsa 1024 bits 0.008518s 0.000413s 117.4 2420.8 software integer
-# rsa 1024 bits 0.004275s 0.000277s 233.9 3609.7 software SSE2
-# rsa 1024 bits 0.012136s 0.000260s 82.4 3844.5 hardware VIA SDK
-# rsa 1024 bits 0.002522s 0.000116s 396.5 8650.9 hardware this
-#
-# rsa 2048 bits 0.050101s 0.001371s 20.0 729.6 software integer
-# rsa 2048 bits 0.030273s 0.001008s 33.0 991.9 software SSE2
-# rsa 2048 bits 0.030833s 0.000976s 32.4 1025.1 hardware VIA SDK
-# rsa 2048 bits 0.011879s 0.000342s 84.2 2921.7 hardware this
-#
-# rsa 4096 bits 0.327097s 0.004859s 3.1 205.8 software integer
-# rsa 4096 bits 0.229318s 0.003859s 4.4 259.2 software SSE2
-# rsa 4096 bits 0.233953s 0.003274s 4.3 305.4 hardware VIA SDK
-# rsa 4096 bits 0.070493s 0.001166s 14.2 857.6 hardware this
-#
-# dsa 512 bits 0.001342s 0.001651s 745.2 605.7 software integer
-# dsa 512 bits 0.000844s 0.000987s 1185.3 1013.1 software SSE2
-# dsa 512 bits 0.001902s 0.002247s 525.6 444.9 hardware VIA SDK
-# dsa 512 bits 0.000458s 0.000524s 2182.2 1909.1 hardware this
-#
-# dsa 1024 bits 0.003964s 0.004926s 252.3 203.0 software integer
-# dsa 1024 bits 0.002686s 0.003166s 372.3 315.8 software SSE2
-# dsa 1024 bits 0.002397s 0.002823s 417.1 354.3 hardware VIA SDK
-# dsa 1024 bits 0.000978s 0.001170s 1022.2 855.0 hardware this
-#
-# dsa 2048 bits 0.013280s 0.016518s 75.3 60.5 software integer
-# dsa 2048 bits 0.009911s 0.011522s 100.9 86.8 software SSE2
-# dsa 2048 bits 0.009542s 0.011763s 104.8 85.0 hardware VIA SDK
-# dsa 2048 bits 0.002884s 0.003352s 346.8 298.3 hardware this
-#
-# To give you some other reference point here is output for 2.4GHz P4
-# running hand-coded SSE2 bn_mul_mont found in 0.9.9, i.e. "software
-# SSE2" in above terms.
-#
-# rsa 512 bits 0.000407s 0.000047s 2454.2 21137.0
-# rsa 1024 bits 0.002426s 0.000141s 412.1 7100.0
-# rsa 2048 bits 0.015046s 0.000491s 66.5 2034.9
-# rsa 4096 bits 0.109770s 0.002379s 9.1 420.3
-# dsa 512 bits 0.000438s 0.000525s 2281.1 1904.1
-# dsa 1024 bits 0.001346s 0.001595s 742.7 627.0
-# dsa 2048 bits 0.004745s 0.005582s 210.7 179.1
-#
-# Conclusions:
-# - VIA SDK leaves a *lot* of room for improvement (which this
-# implementation successfully fills:-);
-# - 'rep montmul' gives up to >3x performance improvement depending on
-# key length;
-# - in terms of absolute performance it delivers approximately as much
-# as modern out-of-order 32-bit cores [again, for longer keys].
-
-$0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
-push(@INC,"${dir}","${dir}../../perlasm");
-require "x86asm.pl";
-
-&asm_init($ARGV[0],"via-mont.pl");
-
-# int bn_mul_mont(BN_ULONG *rp, const BN_ULONG *ap, const BN_ULONG *bp, const BN_ULONG *np,const BN_ULONG *n0, int num);
-$func="bn_mul_mont_padlock";
-
-$pad=16*1; # amount of reserved bytes on top of every vector
-
-# stack layout
-$mZeroPrime=&DWP(0,"esp"); # these are specified by VIA
-$A=&DWP(4,"esp");
-$B=&DWP(8,"esp");
-$T=&DWP(12,"esp");
-$M=&DWP(16,"esp");
-$scratch=&DWP(20,"esp");
-$rp=&DWP(24,"esp"); # these are mine
-$sp=&DWP(28,"esp");
-# &DWP(32,"esp") # 32 byte scratch area
-# &DWP(64+(4*$num+$pad)*0,"esp") # padded tp[num]
-# &DWP(64+(4*$num+$pad)*1,"esp") # padded copy of ap[num]
-# &DWP(64+(4*$num+$pad)*2,"esp") # padded copy of bp[num]
-# &DWP(64+(4*$num+$pad)*3,"esp") # padded copy of np[num]
-# Note that SDK suggests to unconditionally allocate 2K per vector. This
-# has quite an impact on performance. It naturally depends on key length,
-# but to give an example 1024 bit private RSA key operations suffer >30%
-# penalty. I allocate only as much as actually required...
-
-&function_begin($func);
- &xor ("eax","eax");
- &mov ("ecx",&wparam(5)); # num
- # meet VIA's limitations for num [note that the specification
- # expresses them in bits, while we work with amount of 32-bit words]
- &test ("ecx",3);
- &jnz (&label("leave")); # num % 4 != 0
- &cmp ("ecx",8);
- &jb (&label("leave")); # num < 8
- &cmp ("ecx",1024);
- &ja (&label("leave")); # num > 1024
-
- &pushf ();
- &cld ();
-
- &mov ("edi",&wparam(0)); # rp
- &mov ("eax",&wparam(1)); # ap
- &mov ("ebx",&wparam(2)); # bp
- &mov ("edx",&wparam(3)); # np
- &mov ("esi",&wparam(4)); # n0
- &mov ("esi",&DWP(0,"esi")); # *n0
-
- &lea ("ecx",&DWP($pad,"","ecx",4)); # ecx becomes vector size in bytes
- &lea ("ebp",&DWP(64,"","ecx",4)); # allocate 4 vectors + 64 bytes
- &neg ("ebp");
- &add ("ebp","esp");
- &and ("ebp",-64); # align to cache-line
- &xchg ("ebp","esp"); # alloca
-
- &mov ($rp,"edi"); # save rp
- &mov ($sp,"ebp"); # save esp
-
- &mov ($mZeroPrime,"esi");
- &lea ("esi",&DWP(64,"esp")); # tp
- &mov ($T,"esi");
- &lea ("edi",&DWP(32,"esp")); # scratch area
- &mov ($scratch,"edi");
- &mov ("esi","eax");
-
- &lea ("ebp",&DWP(-$pad,"ecx"));
- &shr ("ebp",2); # restore original num value in ebp
-
- &xor ("eax","eax");
-
- &mov ("ecx","ebp");
- &lea ("ecx",&DWP((32+$pad)/4,"ecx"));# padded tp + scratch
- &data_byte(0xf3,0xab); # rep stosl, bzero
-
- &mov ("ecx","ebp");
- &lea ("edi",&DWP(64+$pad,"esp","ecx",4));# pointer to ap copy
- &mov ($A,"edi");
- &data_byte(0xf3,0xa5); # rep movsl, memcpy
- &mov ("ecx",$pad/4);
- &data_byte(0xf3,0xab); # rep stosl, bzero pad
- # edi points at the end of padded ap copy...
-
- &mov ("ecx","ebp");
- &mov ("esi","ebx");
- &mov ($B,"edi");
- &data_byte(0xf3,0xa5); # rep movsl, memcpy
- &mov ("ecx",$pad/4);
- &data_byte(0xf3,0xab); # rep stosl, bzero pad
- # edi points at the end of padded bp copy...
-
- &mov ("ecx","ebp");
- &mov ("esi","edx");
- &mov ($M,"edi");
- &data_byte(0xf3,0xa5); # rep movsl, memcpy
- &mov ("ecx",$pad/4);
- &data_byte(0xf3,0xab); # rep stosl, bzero pad
- # edi points at the end of padded np copy...
-
- # let magic happen...
- &mov ("ecx","ebp");
- &mov ("esi","esp");
- &shl ("ecx",5); # convert word counter to bit counter
- &align (4);
- &data_byte(0xf3,0x0f,0xa6,0xc0);# rep montmul
-
- &mov ("ecx","ebp");
- &lea ("esi",&DWP(64,"esp")); # tp
- # edi still points at the end of padded np copy...
- &neg ("ebp");
- &lea ("ebp",&DWP(-$pad,"edi","ebp",4)); # so just "rewind"
- &mov ("edi",$rp); # restore rp
- &xor ("edx","edx"); # i=0 and clear CF
-
-&set_label("sub",8);
- &mov ("eax",&DWP(0,"esi","edx",4));
- &sbb ("eax",&DWP(0,"ebp","edx",4));
- &mov (&DWP(0,"edi","edx",4),"eax"); # rp[i]=tp[i]-np[i]
- &lea ("edx",&DWP(1,"edx")); # i++
- &loop (&label("sub")); # doesn't affect CF!
-
- &mov ("eax",&DWP(0,"esi","edx",4)); # upmost overflow bit
- &sbb ("eax",0);
- &and ("esi","eax");
- &not ("eax");
- &mov ("ebp","edi");
- &and ("ebp","eax");
- &or ("esi","ebp"); # tp=carry?tp:rp
-
- &mov ("ecx","edx"); # num
- &xor ("edx","edx"); # i=0
-
-&set_label("copy",8);
- &mov ("eax",&DWP(0,"esi","edx",4));
- &mov (&DWP(64,"esp","edx",4),"ecx"); # zap tp
- &mov (&DWP(0,"edi","edx",4),"eax");
- &lea ("edx",&DWP(1,"edx")); # i++
- &loop (&label("copy"));
-
- &mov ("ebp",$sp);
- &xor ("eax","eax");
-
- &mov ("ecx",64/4);
- &mov ("edi","esp"); # zap frame including scratch area
- &data_byte(0xf3,0xab); # rep stosl, bzero
-
- # zap copies of ap, bp and np
- &lea ("edi",&DWP(64+$pad,"esp","edx",4));# pointer to ap
- &lea ("ecx",&DWP(3*$pad/4,"edx","edx",2));
- &data_byte(0xf3,0xab); # rep stosl, bzero
-
- &mov ("esp","ebp");
- &inc ("eax"); # signal "done"
- &popf ();
-&set_label("leave");
-&function_end($func);
-
-&asciz("Padlock Montgomery Multiplication, CRYPTOGAMS by <appro\@openssl.org>");
-
-&asm_finish();