1 /*
2 * VIA PadLock support functions
3 *
4 * Copyright The Mbed TLS Contributors
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 /*
20 * This implementation is based on the VIA PadLock Programming Guide:
21 *
22 * http://www.via.com.tw/en/downloads/whitepapers/initiatives/padlock/
23 * programming_guide.pdf
24 */
25
26 #include "common.h"
27
28 #if defined(MBEDTLS_PADLOCK_C)
29
30 #include "padlock.h"
31
32 #include <string.h>
33
34 #ifndef asm
35 #define asm __asm
36 #endif
37
38 #if defined(MBEDTLS_HAVE_X86)
39
40 /*
41 * PadLock detection routine
42 */
mbedtls_padlock_has_support(int feature)43 int mbedtls_padlock_has_support( int feature )
44 {
45 static int flags = -1;
46 int ebx = 0, edx = 0;
47
48 if( flags == -1 )
49 {
50 asm( "movl %%ebx, %0 \n\t"
51 "movl $0xC0000000, %%eax \n\t"
52 "cpuid \n\t"
53 "cmpl $0xC0000001, %%eax \n\t"
54 "movl $0, %%edx \n\t"
55 "jb 1f \n\t"
56 "movl $0xC0000001, %%eax \n\t"
57 "cpuid \n\t"
58 "1: \n\t"
59 "movl %%edx, %1 \n\t"
60 "movl %2, %%ebx \n\t"
61 : "=m" (ebx), "=m" (edx)
62 : "m" (ebx)
63 : "eax", "ecx", "edx" );
64
65 flags = edx;
66 }
67
68 return( flags & feature );
69 }
70
71 /*
72 * PadLock AES-ECB block en(de)cryption
73 */
mbedtls_padlock_xcryptecb(mbedtls_aes_context * ctx,int mode,const unsigned char input[16],unsigned char output[16])74 int mbedtls_padlock_xcryptecb( mbedtls_aes_context *ctx,
75 int mode,
76 const unsigned char input[16],
77 unsigned char output[16] )
78 {
79 int ebx = 0;
80 uint32_t *rk;
81 uint32_t *blk;
82 uint32_t *ctrl;
83 unsigned char buf[256];
84
85 rk = ctx->rk;
86 blk = MBEDTLS_PADLOCK_ALIGN16( buf );
87 memcpy( blk, input, 16 );
88
89 ctrl = blk + 4;
90 *ctrl = 0x80 | ctx->nr | ( ( ctx->nr + ( mode^1 ) - 10 ) << 9 );
91
92 asm( "pushfl \n\t"
93 "popfl \n\t"
94 "movl %%ebx, %0 \n\t"
95 "movl $1, %%ecx \n\t"
96 "movl %2, %%edx \n\t"
97 "movl %3, %%ebx \n\t"
98 "movl %4, %%esi \n\t"
99 "movl %4, %%edi \n\t"
100 ".byte 0xf3,0x0f,0xa7,0xc8 \n\t"
101 "movl %1, %%ebx \n\t"
102 : "=m" (ebx)
103 : "m" (ebx), "m" (ctrl), "m" (rk), "m" (blk)
104 : "memory", "ecx", "edx", "esi", "edi" );
105
106 memcpy( output, blk, 16 );
107
108 return( 0 );
109 }
110
111 /*
112 * PadLock AES-CBC buffer en(de)cryption
113 */
mbedtls_padlock_xcryptcbc(mbedtls_aes_context * ctx,int mode,size_t length,unsigned char iv[16],const unsigned char * input,unsigned char * output)114 int mbedtls_padlock_xcryptcbc( mbedtls_aes_context *ctx,
115 int mode,
116 size_t length,
117 unsigned char iv[16],
118 const unsigned char *input,
119 unsigned char *output )
120 {
121 int ebx = 0;
122 size_t count;
123 uint32_t *rk;
124 uint32_t *iw;
125 uint32_t *ctrl;
126 unsigned char buf[256];
127
128 if( ( (long) input & 15 ) != 0 ||
129 ( (long) output & 15 ) != 0 )
130 return( MBEDTLS_ERR_PADLOCK_DATA_MISALIGNED );
131
132 rk = ctx->rk;
133 iw = MBEDTLS_PADLOCK_ALIGN16( buf );
134 memcpy( iw, iv, 16 );
135
136 ctrl = iw + 4;
137 *ctrl = 0x80 | ctx->nr | ( ( ctx->nr + ( mode ^ 1 ) - 10 ) << 9 );
138
139 count = ( length + 15 ) >> 4;
140
141 asm( "pushfl \n\t"
142 "popfl \n\t"
143 "movl %%ebx, %0 \n\t"
144 "movl %2, %%ecx \n\t"
145 "movl %3, %%edx \n\t"
146 "movl %4, %%ebx \n\t"
147 "movl %5, %%esi \n\t"
148 "movl %6, %%edi \n\t"
149 "movl %7, %%eax \n\t"
150 ".byte 0xf3,0x0f,0xa7,0xd0 \n\t"
151 "movl %1, %%ebx \n\t"
152 : "=m" (ebx)
153 : "m" (ebx), "m" (count), "m" (ctrl),
154 "m" (rk), "m" (input), "m" (output), "m" (iw)
155 : "memory", "eax", "ecx", "edx", "esi", "edi" );
156
157 memcpy( iv, iw, 16 );
158
159 return( 0 );
160 }
161
162 #endif /* MBEDTLS_HAVE_X86 */
163
164 #endif /* MBEDTLS_PADLOCK_C */
165