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
244
245
246
247
248
249
250
251
252
253
254
|
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#define ARCFOUR_LOOP_OPTIMIZED
#ifndef _KERNEL
#include <stdint.h>
#endif /* _KERNEL */
#include "arcfour.h"
#if defined(__amd64)
/* ARCFour_key.flag values */
#define ARCFOUR_ON_INTEL 1
#define ARCFOUR_ON_AMD64 0
#ifdef _KERNEL
#include <sys/x86_archext.h>
#include <sys/cpuvar.h>
#else
#include <sys/auxv.h>
#endif /* _KERNEL */
#endif /* __amd64 */
#ifndef __amd64
/*
* Initialize the key stream 'key' using the key value.
*
* Input:
* keyval User-provided key
* keyvallen Length, in bytes, of keyval
* Output:
* key Initialized ARCFOUR key schedule, based on keyval
*/
void
arcfour_key_init(ARCFour_key *key, uchar_t *keyval, int keyvallen)
{
uchar_t ext_keyval[256];
uchar_t tmp;
int i, j;
/* Normalize key length to 256 */
for (i = j = 0; i < 256; i++, j++) {
if (j == keyvallen)
j = 0;
ext_keyval[i] = keyval[j];
}
for (i = 0; i < 256; i++)
key->arr[i] = (uchar_t)i;
j = 0;
for (i = 0; i < 256; i++) {
j = (j + key->arr[i] + ext_keyval[i]) & 0xff;
tmp = key->arr[i];
key->arr[i] = key->arr[j];
key->arr[j] = tmp;
}
key->i = 0;
key->j = 0;
}
#endif /* !__amd64 */
/*
* Encipher 'in' using 'key'.
*
* Input:
* key ARCFOUR key, initialized by arcfour_key_init()
* in Input text
* out Buffer to contain output text
* len Length, in bytes, of the in and out buffers
*
* Output:
* out Buffer containing output text
*
* Note: in and out can point to the same location
*/
void
arcfour_crypt(ARCFour_key *key, uchar_t *in, uchar_t *out, size_t len)
{
#ifdef __amd64
if (key->flag == ARCFOUR_ON_AMD64) {
arcfour_crypt_asm(key, in, out, len);
} else { /* Intel EM64T */
#endif /* amd64 */
size_t ii;
uchar_t i, j, ti, tj;
#ifdef ARCFOUR_LOOP_OPTIMIZED
uchar_t arr_ij;
#endif
#ifdef __amd64
uint32_t *arr;
#else
uchar_t *arr;
#endif
#ifdef sun4u
/*
* The sun4u has a version of arcfour_crypt_aligned() hand-tuned for
* the cases where the input and output buffers are aligned on
* a multiple of 8-byte boundary.
*/
int index;
uchar_t tmp;
index = (((uint64_t)(uintptr_t)in) & 0x7);
/* Get the 'in' on an 8-byte alignment */
if (index > 0) {
i = key->i;
j = key->j;
for (index = 8 - (uint64_t)(uintptr_t)in & 0x7;
(index-- > 0) && len > 0;
len--, in++, out++) {
++i;
j = j + key->arr[i];
tmp = key->arr[i];
key->arr[i] = key->arr[j];
key->arr[j] = tmp;
tmp = key->arr[i] + key->arr[j];
*out = *in ^ key->arr[tmp];
}
key->i = i;
key->j = j;
}
if (len == 0)
return;
/* See if we're fortunate and 'out' got aligned as well */
if ((((uint64_t)(uintptr_t)out) & 7) != 0) {
#endif /* sun4u */
i = key->i;
j = key->j;
arr = key->arr;
#ifndef ARCFOUR_LOOP_OPTIMIZED
/*
* This loop is hasn't been reordered, but is kept for reference
* purposes as it's more readable
*/
for (ii = 0; ii < len; ++ii) {
++i;
ti = arr[i];
j = j + ti;
tj = arr[j];
arr[j] = ti;
arr[i] = tj;
out[ii] = in[ii] ^ arr[(ti + tj) & 0xff];
}
#else
/*
* This for loop is optimized by carefully spreading out
* memory access and storage to avoid conflicts,
* allowing the processor to process operations in parallel
*/
/* for loop setup */
++i;
ti = arr[i];
j = j + ti;
tj = arr[j];
arr[j] = ti;
arr[i] = tj;
arr_ij = arr[(ti + tj) & 0xff];
--len;
for (ii = 0; ii < len; ) {
++i;
ti = arr[i];
j = j + ti;
tj = arr[j];
arr[j] = ti;
arr[i] = tj;
/* save result from previous loop: */
out[ii] = in[ii] ^ arr_ij;
++ii;
arr_ij = arr[(ti + tj) & 0xff];
}
/* save result from last loop: */
out[ii] = in[ii] ^ arr_ij;
#endif
key->i = i;
key->j = j;
#ifdef sun4u
} else {
arcfour_crypt_aligned(key, len, in, out);
}
#endif /* sun4u */
#ifdef __amd64
}
#endif /* amd64 */
}
#ifdef __amd64
/*
* Return 1 if executing on Intel, otherwise 0 (e.g., AMD64).
* Cache the result, as the CPU can't change.
*
* Note: the userland version uses getisax() and checks for an AMD-64-only
* feature. The kernel version uses cpuid_getvendor().
*/
int
arcfour_crypt_on_intel(void)
{
static int cached_result = -1;
if (cached_result == -1) { /* first time */
#ifdef _KERNEL
cached_result = (cpuid_getvendor(CPU) == X86_VENDOR_Intel);
#else
uint_t ui;
(void) getisax(&ui, 1);
cached_result = ((ui & AV_386_AMD_MMX) == 0);
#endif /* _KERNEL */
}
return (cached_result);
}
#endif /* __amd64 */
|
