aboutsummaryrefslogtreecommitdiffstats
path: root/crypto/modes/asm/ghashp8-ppc.pl
blob: 71457cf4fc59b10d48fd51cd757a53777dae1095 (plain) (blame)
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
#!/usr/bin/env perl
#
# ====================================================================
# 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 http://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
.align	5
.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

	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
.align	5
.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
.align	5
.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