1 /*
2 * VIA PadLock support functions
3 *
4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
5 * SPDX-License-Identifier: Apache-2.0
6 *
7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
8 * not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 *
19 * This file is part of mbed TLS (https://tls.mbed.org)
20 */
21 /*
22 * This implementation is based on the VIA PadLock Programming Guide:
23 *
24 * http://www.via.com.tw/en/downloads/whitepapers/initiatives/padlock/
25 * programming_guide.pdf
26 */
27
28 #if !defined(MBEDTLS_CONFIG_FILE)
29 #include "mbedtls/config.h"
30 #else
31 #include MBEDTLS_CONFIG_FILE
32 #endif
33
34 #if defined(MBEDTLS_PADLOCK_C)
35
36 #include "mbedtls/padlock.h"
37
38 #include <string.h>
39
40 #ifndef asm
41 #define asm __asm
42 #endif
43
44 #if defined(MBEDTLS_HAVE_X86)
45
46 /*
47 * PadLock detection routine
48 */
mbedtls_padlock_has_support(int feature)49 int mbedtls_padlock_has_support( int feature )
50 {
51 static int flags = -1;
52 int ebx = 0, edx = 0;
53
54 if( flags == -1 )
55 {
56 asm( "movl %%ebx, %0 \n\t"
57 "movl $0xC0000000, %%eax \n\t"
58 "cpuid \n\t"
59 "cmpl $0xC0000001, %%eax \n\t"
60 "movl $0, %%edx \n\t"
61 "jb unsupported \n\t"
62 "movl $0xC0000001, %%eax \n\t"
63 "cpuid \n\t"
64 "unsupported: \n\t"
65 "movl %%edx, %1 \n\t"
66 "movl %2, %%ebx \n\t"
67 : "=m" (ebx), "=m" (edx)
68 : "m" (ebx)
69 : "eax", "ecx", "edx" );
70
71 flags = edx;
72 }
73
74 return( flags & feature );
75 }
76
77 /*
78 * PadLock AES-ECB block en(de)cryption
79 */
mbedtls_padlock_xcryptecb(mbedtls_aes_context * ctx,int mode,const unsigned char input[16],unsigned char output[16])80 int mbedtls_padlock_xcryptecb( mbedtls_aes_context *ctx,
81 int mode,
82 const unsigned char input[16],
83 unsigned char output[16] )
84 {
85 int ebx = 0;
86 uint32_t *rk;
87 uint32_t *blk;
88 uint32_t *ctrl;
89 unsigned char buf[256];
90
91 rk = ctx->rk;
92 blk = MBEDTLS_PADLOCK_ALIGN16( buf );
93 memcpy( blk, input, 16 );
94
95 ctrl = blk + 4;
96 *ctrl = 0x80 | ctx->nr | ( ( ctx->nr + ( mode^1 ) - 10 ) << 9 );
97
98 asm( "pushfl \n\t"
99 "popfl \n\t"
100 "movl %%ebx, %0 \n\t"
101 "movl $1, %%ecx \n\t"
102 "movl %2, %%edx \n\t"
103 "movl %3, %%ebx \n\t"
104 "movl %4, %%esi \n\t"
105 "movl %4, %%edi \n\t"
106 ".byte 0xf3,0x0f,0xa7,0xc8 \n\t"
107 "movl %1, %%ebx \n\t"
108 : "=m" (ebx)
109 : "m" (ebx), "m" (ctrl), "m" (rk), "m" (blk)
110 : "memory", "ecx", "edx", "esi", "edi" );
111
112 memcpy( output, blk, 16 );
113
114 return( 0 );
115 }
116
117 /*
118 * PadLock AES-CBC buffer en(de)cryption
119 */
mbedtls_padlock_xcryptcbc(mbedtls_aes_context * ctx,int mode,size_t length,unsigned char iv[16],const unsigned char * input,unsigned char * output)120 int mbedtls_padlock_xcryptcbc( mbedtls_aes_context *ctx,
121 int mode,
122 size_t length,
123 unsigned char iv[16],
124 const unsigned char *input,
125 unsigned char *output )
126 {
127 int ebx = 0;
128 size_t count;
129 uint32_t *rk;
130 uint32_t *iw;
131 uint32_t *ctrl;
132 unsigned char buf[256];
133
134 if( ( (long) input & 15 ) != 0 ||
135 ( (long) output & 15 ) != 0 )
136 return( MBEDTLS_ERR_PADLOCK_DATA_MISALIGNED );
137
138 rk = ctx->rk;
139 iw = MBEDTLS_PADLOCK_ALIGN16( buf );
140 memcpy( iw, iv, 16 );
141
142 ctrl = iw + 4;
143 *ctrl = 0x80 | ctx->nr | ( ( ctx->nr + ( mode ^ 1 ) - 10 ) << 9 );
144
145 count = ( length + 15 ) >> 4;
146
147 asm( "pushfl \n\t"
148 "popfl \n\t"
149 "movl %%ebx, %0 \n\t"
150 "movl %2, %%ecx \n\t"
151 "movl %3, %%edx \n\t"
152 "movl %4, %%ebx \n\t"
153 "movl %5, %%esi \n\t"
154 "movl %6, %%edi \n\t"
155 "movl %7, %%eax \n\t"
156 ".byte 0xf3,0x0f,0xa7,0xd0 \n\t"
157 "movl %1, %%ebx \n\t"
158 : "=m" (ebx)
159 : "m" (ebx), "m" (count), "m" (ctrl),
160 "m" (rk), "m" (input), "m" (output), "m" (iw)
161 : "memory", "eax", "ecx", "edx", "esi", "edi" );
162
163 memcpy( iv, iw, 16 );
164
165 return( 0 );
166 }
167
168 #endif /* MBEDTLS_HAVE_X86 */
169
170 #endif /* MBEDTLS_PADLOCK_C */
171