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
|
/*
* VIA PadLock support functions
*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
*/
/*
* This implementation is based on the VIA PadLock Programming Guide:
*
* http://www.via.com.tw/en/downloads/whitepapers/initiatives/padlock/
* programming_guide.pdf
*/
#include "common.h"
#if defined(MBEDTLS_PADLOCK_C)
#include "padlock.h"
#include <string.h>
#if defined(MBEDTLS_VIA_PADLOCK_HAVE_CODE)
/*
* PadLock detection routine
*/
int mbedtls_padlock_has_support(int feature)
{
static int flags = -1;
int ebx = 0, edx = 0;
if (flags == -1) {
asm ("movl %%ebx, %0 \n\t"
"movl $0xC0000000, %%eax \n\t"
"cpuid \n\t"
"cmpl $0xC0000001, %%eax \n\t"
"movl $0, %%edx \n\t"
"jb 1f \n\t"
"movl $0xC0000001, %%eax \n\t"
"cpuid \n\t"
"1: \n\t"
"movl %%edx, %1 \n\t"
"movl %2, %%ebx \n\t"
: "=m" (ebx), "=m" (edx)
: "m" (ebx)
: "eax", "ecx", "edx");
flags = edx;
}
return flags & feature;
}
/*
* PadLock AES-ECB block en(de)cryption
*/
int mbedtls_padlock_xcryptecb(mbedtls_aes_context *ctx,
int mode,
const unsigned char input[16],
unsigned char output[16])
{
int ebx = 0;
uint32_t *rk;
uint32_t *blk;
uint32_t *ctrl;
unsigned char buf[256];
rk = ctx->buf + ctx->rk_offset;
if (((long) rk & 15) != 0) {
return MBEDTLS_ERR_PADLOCK_DATA_MISALIGNED;
}
blk = MBEDTLS_PADLOCK_ALIGN16(buf);
memcpy(blk, input, 16);
ctrl = blk + 4;
*ctrl = 0x80 | ctx->nr | ((ctx->nr + (mode^1) - 10) << 9);
asm ("pushfl \n\t"
"popfl \n\t"
"movl %%ebx, %0 \n\t"
"movl $1, %%ecx \n\t"
"movl %2, %%edx \n\t"
"movl %3, %%ebx \n\t"
"movl %4, %%esi \n\t"
"movl %4, %%edi \n\t"
".byte 0xf3,0x0f,0xa7,0xc8 \n\t"
"movl %1, %%ebx \n\t"
: "=m" (ebx)
: "m" (ebx), "m" (ctrl), "m" (rk), "m" (blk)
: "memory", "ecx", "edx", "esi", "edi");
memcpy(output, blk, 16);
return 0;
}
#if defined(MBEDTLS_CIPHER_MODE_CBC)
/*
* PadLock AES-CBC buffer en(de)cryption
*/
int mbedtls_padlock_xcryptcbc(mbedtls_aes_context *ctx,
int mode,
size_t length,
unsigned char iv[16],
const unsigned char *input,
unsigned char *output)
{
int ebx = 0;
size_t count;
uint32_t *rk;
uint32_t *iw;
uint32_t *ctrl;
unsigned char buf[256];
rk = ctx->buf + ctx->rk_offset;
if (((long) input & 15) != 0 ||
((long) output & 15) != 0 ||
((long) rk & 15) != 0) {
return MBEDTLS_ERR_PADLOCK_DATA_MISALIGNED;
}
iw = MBEDTLS_PADLOCK_ALIGN16(buf);
memcpy(iw, iv, 16);
ctrl = iw + 4;
*ctrl = 0x80 | ctx->nr | ((ctx->nr + (mode ^ 1) - 10) << 9);
count = (length + 15) >> 4;
asm ("pushfl \n\t"
"popfl \n\t"
"movl %%ebx, %0 \n\t"
"movl %2, %%ecx \n\t"
"movl %3, %%edx \n\t"
"movl %4, %%ebx \n\t"
"movl %5, %%esi \n\t"
"movl %6, %%edi \n\t"
"movl %7, %%eax \n\t"
".byte 0xf3,0x0f,0xa7,0xd0 \n\t"
"movl %1, %%ebx \n\t"
: "=m" (ebx)
: "m" (ebx), "m" (count), "m" (ctrl),
"m" (rk), "m" (input), "m" (output), "m" (iw)
: "memory", "eax", "ecx", "edx", "esi", "edi");
memcpy(iv, iw, 16);
return 0;
}
#endif /* MBEDTLS_CIPHER_MODE_CBC */
#endif /* MBEDTLS_VIA_PADLOCK_HAVE_CODE */
#endif /* MBEDTLS_PADLOCK_C */
|
