2 # Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
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
10 # ====================================================================
11 # Written by Andy Polyakov <appro@fy.chalmers.se> for the OpenSSL
12 # project. The module is, however, dual licensed under OpenSSL and
13 # CRYPTOGAMS licenses depending on where you obtain it. For further
14 # details see http://www.openssl.org/~appro/cryptogams/.
15 # ====================================================================
17 # Wrapper around 'rep montmul', VIA-specific instruction accessing
18 # PadLock Montgomery Multiplier. The wrapper is designed as drop-in
19 # replacement for OpenSSL bn_mul_mont [first implemented in 0.9.9].
21 # Below are interleaved outputs from 'openssl speed rsa dsa' for 4
22 # different software configurations on 1.5GHz VIA Esther processor.
23 # Lines marked with "software integer" denote performance of hand-
24 # coded integer-only assembler found in OpenSSL 0.9.7. "Software SSE2"
25 # refers to hand-coded SSE2 Montgomery multiplication procedure found
26 # OpenSSL 0.9.9. "Hardware VIA SDK" refers to padlock_pmm routine from
27 # Padlock SDK 2.0.1 available for download from VIA, which naturally
28 # utilizes the magic 'repz montmul' instruction. And finally "hardware
29 # this" refers to *this* implementation which also uses 'repz montmul'
31 # sign verify sign/s verify/s
32 # rsa 512 bits 0.001720s 0.000140s 581.4 7149.7 software integer
33 # rsa 512 bits 0.000690s 0.000086s 1450.3 11606.0 software SSE2
34 # rsa 512 bits 0.006136s 0.000201s 163.0 4974.5 hardware VIA SDK
35 # rsa 512 bits 0.000712s 0.000050s 1404.9 19858.5 hardware this
37 # rsa 1024 bits 0.008518s 0.000413s 117.4 2420.8 software integer
38 # rsa 1024 bits 0.004275s 0.000277s 233.9 3609.7 software SSE2
39 # rsa 1024 bits 0.012136s 0.000260s 82.4 3844.5 hardware VIA SDK
40 # rsa 1024 bits 0.002522s 0.000116s 396.5 8650.9 hardware this
42 # rsa 2048 bits 0.050101s 0.001371s 20.0 729.6 software integer
43 # rsa 2048 bits 0.030273s 0.001008s 33.0 991.9 software SSE2
44 # rsa 2048 bits 0.030833s 0.000976s 32.4 1025.1 hardware VIA SDK
45 # rsa 2048 bits 0.011879s 0.000342s 84.2 2921.7 hardware this
47 # rsa 4096 bits 0.327097s 0.004859s 3.1 205.8 software integer
48 # rsa 4096 bits 0.229318s 0.003859s 4.4 259.2 software SSE2
49 # rsa 4096 bits 0.233953s 0.003274s 4.3 305.4 hardware VIA SDK
50 # rsa 4096 bits 0.070493s 0.001166s 14.2 857.6 hardware this
52 # dsa 512 bits 0.001342s 0.001651s 745.2 605.7 software integer
53 # dsa 512 bits 0.000844s 0.000987s 1185.3 1013.1 software SSE2
54 # dsa 512 bits 0.001902s 0.002247s 525.6 444.9 hardware VIA SDK
55 # dsa 512 bits 0.000458s 0.000524s 2182.2 1909.1 hardware this
57 # dsa 1024 bits 0.003964s 0.004926s 252.3 203.0 software integer
58 # dsa 1024 bits 0.002686s 0.003166s 372.3 315.8 software SSE2
59 # dsa 1024 bits 0.002397s 0.002823s 417.1 354.3 hardware VIA SDK
60 # dsa 1024 bits 0.000978s 0.001170s 1022.2 855.0 hardware this
62 # dsa 2048 bits 0.013280s 0.016518s 75.3 60.5 software integer
63 # dsa 2048 bits 0.009911s 0.011522s 100.9 86.8 software SSE2
64 # dsa 2048 bits 0.009542s 0.011763s 104.8 85.0 hardware VIA SDK
65 # dsa 2048 bits 0.002884s 0.003352s 346.8 298.3 hardware this
67 # To give you some other reference point here is output for 2.4GHz P4
68 # running hand-coded SSE2 bn_mul_mont found in 0.9.9, i.e. "software
69 # SSE2" in above terms.
71 # rsa 512 bits 0.000407s 0.000047s 2454.2 21137.0
72 # rsa 1024 bits 0.002426s 0.000141s 412.1 7100.0
73 # rsa 2048 bits 0.015046s 0.000491s 66.5 2034.9
74 # rsa 4096 bits 0.109770s 0.002379s 9.1 420.3
75 # dsa 512 bits 0.000438s 0.000525s 2281.1 1904.1
76 # dsa 1024 bits 0.001346s 0.001595s 742.7 627.0
77 # dsa 2048 bits 0.004745s 0.005582s 210.7 179.1
80 # - VIA SDK leaves a *lot* of room for improvement (which this
81 # implementation successfully fills:-);
82 # - 'rep montmul' gives up to >3x performance improvement depending on
84 # - in terms of absolute performance it delivers approximately as much
85 # as modern out-of-order 32-bit cores [again, for longer keys].
87 $0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
88 push(@INC,"${dir}","${dir}../../perlasm");
92 open STDOUT,">$output";
94 &asm_init($ARGV[0],"via-mont.pl");
96 # 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);
97 $func="bn_mul_mont_padlock";
99 $pad=16*1; # amount of reserved bytes on top of every vector
102 $mZeroPrime=&DWP(0,"esp"); # these are specified by VIA
107 $scratch=&DWP(20,"esp");
108 $rp=&DWP(24,"esp"); # these are mine
110 # &DWP(32,"esp") # 32 byte scratch area
111 # &DWP(64+(4*$num+$pad)*0,"esp") # padded tp[num]
112 # &DWP(64+(4*$num+$pad)*1,"esp") # padded copy of ap[num]
113 # &DWP(64+(4*$num+$pad)*2,"esp") # padded copy of bp[num]
114 # &DWP(64+(4*$num+$pad)*3,"esp") # padded copy of np[num]
115 # Note that SDK suggests to unconditionally allocate 2K per vector. This
116 # has quite an impact on performance. It naturally depends on key length,
117 # but to give an example 1024 bit private RSA key operations suffer >30%
118 # penalty. I allocate only as much as actually required...
120 &function_begin($func);
122 &mov ("ecx",&wparam(5)); # num
123 # meet VIA's limitations for num [note that the specification
124 # expresses them in bits, while we work with amount of 32-bit words]
126 &jnz (&label("leave")); # num % 4 != 0
128 &jb (&label("leave")); # num < 8
130 &ja (&label("leave")); # num > 1024
135 &mov ("edi",&wparam(0)); # rp
136 &mov ("eax",&wparam(1)); # ap
137 &mov ("ebx",&wparam(2)); # bp
138 &mov ("edx",&wparam(3)); # np
139 &mov ("esi",&wparam(4)); # n0
140 &mov ("esi",&DWP(0,"esi")); # *n0
142 &lea ("ecx",&DWP($pad,"","ecx",4)); # ecx becomes vector size in bytes
143 &lea ("ebp",&DWP(64,"","ecx",4)); # allocate 4 vectors + 64 bytes
146 &and ("ebp",-64); # align to cache-line
147 &xchg ("ebp","esp"); # alloca
149 &mov ($rp,"edi"); # save rp
150 &mov ($sp,"ebp"); # save esp
152 &mov ($mZeroPrime,"esi");
153 &lea ("esi",&DWP(64,"esp")); # tp
155 &lea ("edi",&DWP(32,"esp")); # scratch area
156 &mov ($scratch,"edi");
159 &lea ("ebp",&DWP(-$pad,"ecx"));
160 &shr ("ebp",2); # restore original num value in ebp
165 &lea ("ecx",&DWP((32+$pad)/4,"ecx"));# padded tp + scratch
166 &data_byte(0xf3,0xab); # rep stosl, bzero
169 &lea ("edi",&DWP(64+$pad,"esp","ecx",4));# pointer to ap copy
171 &data_byte(0xf3,0xa5); # rep movsl, memcpy
173 &data_byte(0xf3,0xab); # rep stosl, bzero pad
174 # edi points at the end of padded ap copy...
179 &data_byte(0xf3,0xa5); # rep movsl, memcpy
181 &data_byte(0xf3,0xab); # rep stosl, bzero pad
182 # edi points at the end of padded bp copy...
187 &data_byte(0xf3,0xa5); # rep movsl, memcpy
189 &data_byte(0xf3,0xab); # rep stosl, bzero pad
190 # edi points at the end of padded np copy...
192 # let magic happen...
195 &shl ("ecx",5); # convert word counter to bit counter
197 &data_byte(0xf3,0x0f,0xa6,0xc0);# rep montmul
200 &lea ("esi",&DWP(64,"esp")); # tp
201 # edi still points at the end of padded np copy...
203 &lea ("ebp",&DWP(-$pad,"edi","ebp",4)); # so just "rewind"
204 &mov ("edi",$rp); # restore rp
205 &xor ("edx","edx"); # i=0 and clear CF
208 &mov ("eax",&DWP(0,"esi","edx",4));
209 &sbb ("eax",&DWP(0,"ebp","edx",4));
210 &mov (&DWP(0,"edi","edx",4),"eax"); # rp[i]=tp[i]-np[i]
211 &lea ("edx",&DWP(1,"edx")); # i++
212 &loop (&label("sub")); # doesn't affect CF!
214 &mov ("eax",&DWP(0,"esi","edx",4)); # upmost overflow bit
220 &or ("esi","ebp"); # tp=carry?tp:rp
222 &mov ("ecx","edx"); # num
223 &xor ("edx","edx"); # i=0
225 &set_label("copy",8);
226 &mov ("eax",&DWP(0,"esi","edx",4));
227 &mov (&DWP(64,"esp","edx",4),"ecx"); # zap tp
228 &mov (&DWP(0,"edi","edx",4),"eax");
229 &lea ("edx",&DWP(1,"edx")); # i++
230 &loop (&label("copy"));
236 &mov ("edi","esp"); # zap frame including scratch area
237 &data_byte(0xf3,0xab); # rep stosl, bzero
239 # zap copies of ap, bp and np
240 &lea ("edi",&DWP(64+$pad,"esp","edx",4));# pointer to ap
241 &lea ("ecx",&DWP(3*$pad/4,"edx","edx",2));
242 &data_byte(0xf3,0xab); # rep stosl, bzero
245 &inc ("eax"); # signal "done"
248 &function_end($func);
250 &asciz("Padlock Montgomery Multiplication, CRYPTOGAMS by <appro\@openssl.org>");