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
|
/* crc-armv8-ce.c - ARMv8-CE PMULL accelerated CRC implementation
* Copyright (C) 2019 Jussi Kivilinna <jussi.kivilinna@iki.fi>
*
* This file is part of Libgcrypt.
*
* Libgcrypt is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* Libgcrypt is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "g10lib.h"
#include "bithelp.h"
#include "bufhelp.h"
#if defined(ENABLE_ARM_CRYPTO_SUPPORT) && defined(__AARCH64EL__) && \
defined(HAVE_COMPATIBLE_GCC_AARCH64_PLATFORM_AS) && \
defined(HAVE_GCC_INLINE_ASM_AARCH64_CRYPTO)
#define ALIGNED_16 __attribute__ ((aligned (16)))
struct u16_unaligned_s
{
u16 a;
} __attribute__((packed, aligned (1), may_alias));
struct u32_unaligned_s
{
u32 a;
} __attribute__((packed, aligned (1), may_alias));
/* Constants structure for generic reflected/non-reflected CRC32 PMULL
* functions. */
struct crc32_consts_s
{
/* k: { x^(32*17), x^(32*15), x^(32*5), x^(32*3), x^(32*2), 0 } mod P(x) */
u64 k[6];
/* my_p: { floor(x^64 / P(x)), P(x) } */
u64 my_p[2];
};
/* PMULL constants for CRC32 and CRC32RFC1510. */
static const struct crc32_consts_s crc32_consts ALIGNED_16 =
{
{ /* k[6] = reverse_33bits( x^(32*y) mod P(x) ) */
U64_C(0x154442bd4), U64_C(0x1c6e41596), /* y = { 17, 15 } */
U64_C(0x1751997d0), U64_C(0x0ccaa009e), /* y = { 5, 3 } */
U64_C(0x163cd6124), 0 /* y = 2 */
},
{ /* my_p[2] = reverse_33bits ( { floor(x^64 / P(x)), P(x) } ) */
U64_C(0x1f7011641), U64_C(0x1db710641)
}
};
/* PMULL constants for CRC24RFC2440 (polynomial multiplied with x⁸). */
static const struct crc32_consts_s crc24rfc2440_consts ALIGNED_16 =
{
{ /* k[6] = x^(32*y) mod P(x) << 32*/
U64_C(0x08289a00) << 32, U64_C(0x74b44a00) << 32, /* y = { 17, 15 } */
U64_C(0xc4b14d00) << 32, U64_C(0xfd7e0c00) << 32, /* y = { 5, 3 } */
U64_C(0xd9fe8c00) << 32, 0 /* y = 2 */
},
{ /* my_p[2] = { floor(x^64 / P(x)), P(x) } */
U64_C(0x1f845fe24), U64_C(0x1864cfb00)
}
};
u32 _gcry_crc32r_armv8_ce_reduction_4 (u32 data, u32 crc,
const struct crc32_consts_s *consts);
void _gcry_crc32r_armv8_ce_bulk (u32 *pcrc, const byte *inbuf, size_t inlen,
const struct crc32_consts_s *consts);
u32 _gcry_crc32_armv8_ce_reduction_4 (u32 data, u32 crc,
const struct crc32_consts_s *consts);
void _gcry_crc32_armv8_ce_bulk (u32 *pcrc, const byte *inbuf, size_t inlen,
const struct crc32_consts_s *consts);
static inline void
crc32r_less_than_16 (u32 *pcrc, const byte *inbuf, size_t inlen,
const struct crc32_consts_s *consts)
{
u32 crc = *pcrc;
u32 data;
while (inlen >= 4)
{
data = ((const struct u32_unaligned_s *)inbuf)->a;
data ^= crc;
inlen -= 4;
inbuf += 4;
crc = _gcry_crc32r_armv8_ce_reduction_4 (data, 0, consts);
}
switch (inlen)
{
case 0:
break;
case 1:
data = inbuf[0];
data ^= crc;
data <<= 24;
crc >>= 8;
crc = _gcry_crc32r_armv8_ce_reduction_4 (data, crc, consts);
break;
case 2:
data = ((const struct u16_unaligned_s *)inbuf)->a;
data ^= crc;
data <<= 16;
crc >>= 16;
crc = _gcry_crc32r_armv8_ce_reduction_4 (data, crc, consts);
break;
case 3:
data = ((const struct u16_unaligned_s *)inbuf)->a;
data |= inbuf[2] << 16;
data ^= crc;
data <<= 8;
crc >>= 24;
crc = _gcry_crc32r_armv8_ce_reduction_4 (data, crc, consts);
break;
}
*pcrc = crc;
}
static inline void
crc32_less_than_16 (u32 *pcrc, const byte *inbuf, size_t inlen,
const struct crc32_consts_s *consts)
{
u32 crc = *pcrc;
u32 data;
while (inlen >= 4)
{
data = ((const struct u32_unaligned_s *)inbuf)->a;
data ^= crc;
data = _gcry_bswap32(data);
inlen -= 4;
inbuf += 4;
crc = _gcry_crc32_armv8_ce_reduction_4 (data, 0, consts);
}
switch (inlen)
{
case 0:
break;
case 1:
data = inbuf[0];
data ^= crc;
data = data & 0xffU;
crc = _gcry_bswap32(crc >> 8);
crc = _gcry_crc32_armv8_ce_reduction_4 (data, crc, consts);
break;
case 2:
data = ((const struct u16_unaligned_s *)inbuf)->a;
data ^= crc;
data = _gcry_bswap32(data << 16);
crc = _gcry_bswap32(crc >> 16);
crc = _gcry_crc32_armv8_ce_reduction_4 (data, crc, consts);
break;
case 3:
data = ((const struct u16_unaligned_s *)inbuf)->a;
data |= inbuf[2] << 16;
data ^= crc;
data = _gcry_bswap32(data << 8);
crc = crc & 0xff000000U;
crc = _gcry_crc32_armv8_ce_reduction_4 (data, crc, consts);
break;
}
*pcrc = crc;
}
void
_gcry_crc32_armv8_ce_pmull (u32 *pcrc, const byte *inbuf, size_t inlen)
{
const struct crc32_consts_s *consts = &crc32_consts;
if (!inlen)
return;
if (inlen >= 16)
_gcry_crc32r_armv8_ce_bulk (pcrc, inbuf, inlen, consts);
else
crc32r_less_than_16 (pcrc, inbuf, inlen, consts);
}
void
_gcry_crc24rfc2440_armv8_ce_pmull (u32 *pcrc, const byte *inbuf, size_t inlen)
{
const struct crc32_consts_s *consts = &crc24rfc2440_consts;
if (!inlen)
return;
/* Note: *pcrc in input endian. */
if (inlen >= 16)
_gcry_crc32_armv8_ce_bulk (pcrc, inbuf, inlen, consts);
else
crc32_less_than_16 (pcrc, inbuf, inlen, consts);
}
#endif
|
