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
|
/*
* Copyright (c) 2017 Thomas Pornin <pornin@bolet.org>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#define BR_ENABLE_INTRINSICS 1
#include "inner.h"
/*
* This code contains the AES key schedule implementation using the
* AES-NI opcodes.
*/
#if BR_AES_X86NI
/* see inner.h */
int
br_aes_x86ni_supported(void)
{
/*
* Bit mask for features in ECX:
* 19 SSE4.1 (used for _mm_insert_epi32(), for AES-CTR)
* 25 AES-NI
*/
return br_cpuid(0, 0, 0x02080000, 0);
}
BR_TARGETS_X86_UP
BR_TARGET("sse2,aes")
static inline __m128i
expand_step128(__m128i k, __m128i k2)
{
k = _mm_xor_si128(k, _mm_slli_si128(k, 4));
k = _mm_xor_si128(k, _mm_slli_si128(k, 4));
k = _mm_xor_si128(k, _mm_slli_si128(k, 4));
k2 = _mm_shuffle_epi32(k2, 0xFF);
return _mm_xor_si128(k, k2);
}
BR_TARGET("sse2,aes")
static inline void
expand_step192(__m128i *t1, __m128i *t2, __m128i *t3)
{
__m128i t4;
*t2 = _mm_shuffle_epi32(*t2, 0x55);
t4 = _mm_slli_si128(*t1, 0x4);
*t1 = _mm_xor_si128(*t1, t4);
t4 = _mm_slli_si128(t4, 0x4);
*t1 = _mm_xor_si128(*t1, t4);
t4 = _mm_slli_si128(t4, 0x4);
*t1 = _mm_xor_si128(*t1, t4);
*t1 = _mm_xor_si128(*t1, *t2);
*t2 = _mm_shuffle_epi32(*t1, 0xFF);
t4 = _mm_slli_si128(*t3, 0x4);
*t3 = _mm_xor_si128(*t3, t4);
*t3 = _mm_xor_si128(*t3, *t2);
}
BR_TARGET("sse2,aes")
static inline void
expand_step256_1(__m128i *t1, __m128i *t2)
{
__m128i t4;
*t2 = _mm_shuffle_epi32(*t2, 0xFF);
t4 = _mm_slli_si128(*t1, 0x4);
*t1 = _mm_xor_si128(*t1, t4);
t4 = _mm_slli_si128(t4, 0x4);
*t1 = _mm_xor_si128(*t1, t4);
t4 = _mm_slli_si128(t4, 0x4);
*t1 = _mm_xor_si128(*t1, t4);
*t1 = _mm_xor_si128(*t1, *t2);
}
BR_TARGET("sse2,aes")
static inline void
expand_step256_2(__m128i *t1, __m128i *t3)
{
__m128i t2, t4;
t4 = _mm_aeskeygenassist_si128(*t1, 0x0);
t2 = _mm_shuffle_epi32(t4, 0xAA);
t4 = _mm_slli_si128(*t3, 0x4);
*t3 = _mm_xor_si128(*t3, t4);
t4 = _mm_slli_si128(t4, 0x4);
*t3 = _mm_xor_si128(*t3, t4);
t4 = _mm_slli_si128(t4, 0x4);
*t3 = _mm_xor_si128(*t3, t4);
*t3 = _mm_xor_si128(*t3, t2);
}
/*
* Perform key schedule for AES, encryption direction. Subkeys are written
* in sk[], and the number of rounds is returned. Key length MUST be 16,
* 24 or 32 bytes.
*/
BR_TARGET("sse2,aes")
static unsigned
x86ni_keysched(__m128i *sk, const void *key, size_t len)
{
const unsigned char *kb;
#define KEXP128(k, i, rcon) do { \
k = expand_step128(k, _mm_aeskeygenassist_si128(k, rcon)); \
sk[i] = k; \
} while (0)
#define KEXP192(i, rcon1, rcon2) do { \
sk[(i) + 0] = t1; \
sk[(i) + 1] = t3; \
t2 = _mm_aeskeygenassist_si128(t3, rcon1); \
expand_step192(&t1, &t2, &t3); \
sk[(i) + 1] = _mm_castpd_si128(_mm_shuffle_pd( \
_mm_castsi128_pd(sk[(i) + 1]), \
_mm_castsi128_pd(t1), 0)); \
sk[(i) + 2] = _mm_castpd_si128(_mm_shuffle_pd( \
_mm_castsi128_pd(t1), \
_mm_castsi128_pd(t3), 1)); \
t2 = _mm_aeskeygenassist_si128(t3, rcon2); \
expand_step192(&t1, &t2, &t3); \
} while (0)
#define KEXP256(i, rcon) do { \
sk[(i) + 0] = t3; \
t2 = _mm_aeskeygenassist_si128(t3, rcon); \
expand_step256_1(&t1, &t2); \
sk[(i) + 1] = t1; \
expand_step256_2(&t1, &t3); \
} while (0)
kb = key;
switch (len) {
__m128i t1, t2, t3;
case 16:
t1 = _mm_loadu_si128((const void *)kb);
sk[0] = t1;
KEXP128(t1, 1, 0x01);
KEXP128(t1, 2, 0x02);
KEXP128(t1, 3, 0x04);
KEXP128(t1, 4, 0x08);
KEXP128(t1, 5, 0x10);
KEXP128(t1, 6, 0x20);
KEXP128(t1, 7, 0x40);
KEXP128(t1, 8, 0x80);
KEXP128(t1, 9, 0x1B);
KEXP128(t1, 10, 0x36);
return 10;
case 24:
t1 = _mm_loadu_si128((const void *)kb);
t3 = _mm_loadu_si128((const void *)(kb + 8));
t3 = _mm_shuffle_epi32(t3, 0x4E);
KEXP192(0, 0x01, 0x02);
KEXP192(3, 0x04, 0x08);
KEXP192(6, 0x10, 0x20);
KEXP192(9, 0x40, 0x80);
sk[12] = t1;
return 12;
case 32:
t1 = _mm_loadu_si128((const void *)kb);
t3 = _mm_loadu_si128((const void *)(kb + 16));
sk[0] = t1;
KEXP256( 1, 0x01);
KEXP256( 3, 0x02);
KEXP256( 5, 0x04);
KEXP256( 7, 0x08);
KEXP256( 9, 0x10);
KEXP256(11, 0x20);
sk[13] = t3;
t2 = _mm_aeskeygenassist_si128(t3, 0x40);
expand_step256_1(&t1, &t2);
sk[14] = t1;
return 14;
default:
return 0;
}
#undef KEXP128
#undef KEXP192
#undef KEXP256
}
/* see inner.h */
BR_TARGET("sse2,aes")
unsigned
br_aes_x86ni_keysched_enc(unsigned char *skni, const void *key, size_t len)
{
__m128i sk[15];
unsigned num_rounds;
num_rounds = x86ni_keysched(sk, key, len);
memcpy(skni, sk, (num_rounds + 1) << 4);
return num_rounds;
}
/* see inner.h */
BR_TARGET("sse2,aes")
unsigned
br_aes_x86ni_keysched_dec(unsigned char *skni, const void *key, size_t len)
{
__m128i sk[15];
unsigned u, num_rounds;
num_rounds = x86ni_keysched(sk, key, len);
_mm_storeu_si128((void *)skni, sk[num_rounds]);
for (u = 1; u < num_rounds; u ++) {
_mm_storeu_si128((void *)(skni + (u << 4)),
_mm_aesimc_si128(sk[num_rounds - u]));
}
_mm_storeu_si128((void *)(skni + (num_rounds << 4)), sk[0]);
return num_rounds;
}
BR_TARGETS_X86_DOWN
#endif
|
