1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
| #!/usr/bin/env perl
| # SPDX-License-Identifier: GPL-2.0
|
| # This code is taken from the OpenSSL project but the author (Andy Polyakov)
| # has relicensed it under the GPLv2. Therefore this program is free software;
| # you can redistribute it and/or modify it under the terms of the GNU General
| # Public License version 2 as published by the Free Software Foundation.
| #
| # The original headers, including the original license headers, are
| # included below for completeness.
|
| # ====================================================================
| # Written by Andy Polyakov <appro@openssl.org> 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 https://www.openssl.org/~appro/cryptogams/.
| # ====================================================================
| #
| # GHASH for for PowerISA v2.07.
| #
| # July 2014
| #
| # Accurate performance measurements are problematic, because it's
| # always virtualized setup with possibly throttled processor.
| # Relative comparison is therefore more informative. This initial
| # version is ~2.1x slower than hardware-assisted AES-128-CTR, ~12x
| # faster than "4-bit" integer-only compiler-generated 64-bit code.
| # "Initial version" means that there is room for futher improvement.
|
| $flavour=shift;
| $output =shift;
|
| if ($flavour =~ /64/) {
| $SIZE_T=8;
| $LRSAVE=2*$SIZE_T;
| $STU="stdu";
| $POP="ld";
| $PUSH="std";
| } elsif ($flavour =~ /32/) {
| $SIZE_T=4;
| $LRSAVE=$SIZE_T;
| $STU="stwu";
| $POP="lwz";
| $PUSH="stw";
| } else { die "nonsense $flavour"; }
|
| $0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
| ( $xlate="${dir}ppc-xlate.pl" and -f $xlate ) or
| ( $xlate="${dir}../../perlasm/ppc-xlate.pl" and -f $xlate) or
| die "can't locate ppc-xlate.pl";
|
| open STDOUT,"| $^X $xlate $flavour $output" || die "can't call $xlate: $!";
|
| my ($Xip,$Htbl,$inp,$len)=map("r$_",(3..6)); # argument block
|
| my ($Xl,$Xm,$Xh,$IN)=map("v$_",(0..3));
| my ($zero,$t0,$t1,$t2,$xC2,$H,$Hh,$Hl,$lemask)=map("v$_",(4..12));
| my $vrsave="r12";
|
| $code=<<___;
| .machine "any"
|
| .text
|
| .globl .gcm_init_p8
| lis r0,0xfff0
| li r8,0x10
| mfspr $vrsave,256
| li r9,0x20
| mtspr 256,r0
| li r10,0x30
| lvx_u $H,0,r4 # load H
| le?xor r7,r7,r7
| le?addi r7,r7,0x8 # need a vperm start with 08
| le?lvsr 5,0,r7
| le?vspltisb 6,0x0f
| le?vxor 5,5,6 # set a b-endian mask
| le?vperm $H,$H,$H,5
|
| vspltisb $xC2,-16 # 0xf0
| vspltisb $t0,1 # one
| vaddubm $xC2,$xC2,$xC2 # 0xe0
| vxor $zero,$zero,$zero
| vor $xC2,$xC2,$t0 # 0xe1
| vsldoi $xC2,$xC2,$zero,15 # 0xe1...
| vsldoi $t1,$zero,$t0,1 # ...1
| vaddubm $xC2,$xC2,$xC2 # 0xc2...
| vspltisb $t2,7
| vor $xC2,$xC2,$t1 # 0xc2....01
| vspltb $t1,$H,0 # most significant byte
| vsl $H,$H,$t0 # H<<=1
| vsrab $t1,$t1,$t2 # broadcast carry bit
| vand $t1,$t1,$xC2
| vxor $H,$H,$t1 # twisted H
|
| vsldoi $H,$H,$H,8 # twist even more ...
| vsldoi $xC2,$zero,$xC2,8 # 0xc2.0
| vsldoi $Hl,$zero,$H,8 # ... and split
| vsldoi $Hh,$H,$zero,8
|
| stvx_u $xC2,0,r3 # save pre-computed table
| stvx_u $Hl,r8,r3
| stvx_u $H, r9,r3
| stvx_u $Hh,r10,r3
|
| mtspr 256,$vrsave
| blr
| .long 0
| .byte 0,12,0x14,0,0,0,2,0
| .long 0
| .size .gcm_init_p8,.-.gcm_init_p8
|
| .globl .gcm_gmult_p8
| lis r0,0xfff8
| li r8,0x10
| mfspr $vrsave,256
| li r9,0x20
| mtspr 256,r0
| li r10,0x30
| lvx_u $IN,0,$Xip # load Xi
|
| lvx_u $Hl,r8,$Htbl # load pre-computed table
| le?lvsl $lemask,r0,r0
| lvx_u $H, r9,$Htbl
| le?vspltisb $t0,0x07
| lvx_u $Hh,r10,$Htbl
| le?vxor $lemask,$lemask,$t0
| lvx_u $xC2,0,$Htbl
| le?vperm $IN,$IN,$IN,$lemask
| vxor $zero,$zero,$zero
|
| vpmsumd $Xl,$IN,$Hl # H.lo·Xi.lo
| vpmsumd $Xm,$IN,$H # H.hi·Xi.lo+H.lo·Xi.hi
| vpmsumd $Xh,$IN,$Hh # H.hi·Xi.hi
|
| vpmsumd $t2,$Xl,$xC2 # 1st phase
|
| vsldoi $t0,$Xm,$zero,8
| vsldoi $t1,$zero,$Xm,8
| vxor $Xl,$Xl,$t0
| vxor $Xh,$Xh,$t1
|
| vsldoi $Xl,$Xl,$Xl,8
| vxor $Xl,$Xl,$t2
|
| vsldoi $t1,$Xl,$Xl,8 # 2nd phase
| vpmsumd $Xl,$Xl,$xC2
| vxor $t1,$t1,$Xh
| vxor $Xl,$Xl,$t1
|
| le?vperm $Xl,$Xl,$Xl,$lemask
| stvx_u $Xl,0,$Xip # write out Xi
|
| mtspr 256,$vrsave
| blr
| .long 0
| .byte 0,12,0x14,0,0,0,2,0
| .long 0
| .size .gcm_gmult_p8,.-.gcm_gmult_p8
|
| .globl .gcm_ghash_p8
| lis r0,0xfff8
| li r8,0x10
| mfspr $vrsave,256
| li r9,0x20
| mtspr 256,r0
| li r10,0x30
| lvx_u $Xl,0,$Xip # load Xi
|
| lvx_u $Hl,r8,$Htbl # load pre-computed table
| le?lvsl $lemask,r0,r0
| lvx_u $H, r9,$Htbl
| le?vspltisb $t0,0x07
| lvx_u $Hh,r10,$Htbl
| le?vxor $lemask,$lemask,$t0
| lvx_u $xC2,0,$Htbl
| le?vperm $Xl,$Xl,$Xl,$lemask
| vxor $zero,$zero,$zero
|
| lvx_u $IN,0,$inp
| addi $inp,$inp,16
| subi $len,$len,16
| le?vperm $IN,$IN,$IN,$lemask
| vxor $IN,$IN,$Xl
| b Loop
|
| .align 5
| Loop:
| subic $len,$len,16
| vpmsumd $Xl,$IN,$Hl # H.lo·Xi.lo
| subfe. r0,r0,r0 # borrow?-1:0
| vpmsumd $Xm,$IN,$H # H.hi·Xi.lo+H.lo·Xi.hi
| and r0,r0,$len
| vpmsumd $Xh,$IN,$Hh # H.hi·Xi.hi
| add $inp,$inp,r0
|
| vpmsumd $t2,$Xl,$xC2 # 1st phase
|
| vsldoi $t0,$Xm,$zero,8
| vsldoi $t1,$zero,$Xm,8
| vxor $Xl,$Xl,$t0
| vxor $Xh,$Xh,$t1
|
| vsldoi $Xl,$Xl,$Xl,8
| vxor $Xl,$Xl,$t2
| lvx_u $IN,0,$inp
| addi $inp,$inp,16
|
| vsldoi $t1,$Xl,$Xl,8 # 2nd phase
| vpmsumd $Xl,$Xl,$xC2
| le?vperm $IN,$IN,$IN,$lemask
| vxor $t1,$t1,$Xh
| vxor $IN,$IN,$t1
| vxor $IN,$IN,$Xl
| beq Loop # did $len-=16 borrow?
|
| vxor $Xl,$Xl,$t1
| le?vperm $Xl,$Xl,$Xl,$lemask
| stvx_u $Xl,0,$Xip # write out Xi
|
| mtspr 256,$vrsave
| blr
| .long 0
| .byte 0,12,0x14,0,0,0,4,0
| .long 0
| .size .gcm_ghash_p8,.-.gcm_ghash_p8
|
| .asciz "GHASH for PowerISA 2.07, CRYPTOGAMS by <appro\@openssl.org>"
| .align 2
| ___
|
| foreach (split("\n",$code)) {
| if ($flavour =~ /le$/o) { # little-endian
| s/le\?//o or
| s/be\?/#be#/o;
| } else {
| s/le\?/#le#/o or
| s/be\?//o;
| }
| print $_,"\n";
| }
|
| close STDOUT; # enforce flush
|
|
