1 /* 2 * VIA PadLock support functions 3 * 4 * Copyright The Mbed TLS Contributors 5 * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later 6 * 7 * This file is provided under the Apache License 2.0, or the 8 * GNU General Public License v2.0 or later. 9 * 10 * ********** 11 * Apache License 2.0: 12 * 13 * Licensed under the Apache License, Version 2.0 (the "License"); you may 14 * not use this file except in compliance with the License. 15 * You may obtain a copy of the License at 16 * 17 * http://www.apache.org/licenses/LICENSE-2.0 18 * 19 * Unless required by applicable law or agreed to in writing, software 20 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 21 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 22 * See the License for the specific language governing permissions and 23 * limitations under the License. 24 * 25 * ********** 26 * 27 * ********** 28 * GNU General Public License v2.0 or later: 29 * 30 * This program is free software; you can redistribute it and/or modify 31 * it under the terms of the GNU General Public License as published by 32 * the Free Software Foundation; either version 2 of the License, or 33 * (at your option) any later version. 34 * 35 * This program is distributed in the hope that it will be useful, 36 * but WITHOUT ANY WARRANTY; without even the implied warranty of 37 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 38 * GNU General Public License for more details. 39 * 40 * You should have received a copy of the GNU General Public License along 41 * with this program; if not, write to the Free Software Foundation, Inc., 42 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 43 * 44 * ********** 45 */ 46 /* 47 * This implementation is based on the VIA PadLock Programming Guide: 48 * 49 * http://www.via.com.tw/en/downloads/whitepapers/initiatives/padlock/ 50 * programming_guide.pdf 51 */ 52 53 #if !defined(MBEDTLS_CONFIG_FILE) 54 #include "mbedtls/config.h" 55 #else 56 #include MBEDTLS_CONFIG_FILE 57 #endif 58 59 #if defined(MBEDTLS_PADLOCK_C) 60 61 #include "mbedtls/padlock.h" 62 63 #include <string.h> 64 65 #ifndef asm 66 #define asm __asm 67 #endif 68 69 #if defined(MBEDTLS_HAVE_X86) 70 71 /* 72 * PadLock detection routine 73 */ 74 int mbedtls_padlock_has_support( int feature ) 75 { 76 static int flags = -1; 77 int ebx = 0, edx = 0; 78 79 if( flags == -1 ) 80 { 81 asm( "movl %%ebx, %0 \n\t" 82 "movl $0xC0000000, %%eax \n\t" 83 "cpuid \n\t" 84 "cmpl $0xC0000001, %%eax \n\t" 85 "movl $0, %%edx \n\t" 86 "jb unsupported \n\t" 87 "movl $0xC0000001, %%eax \n\t" 88 "cpuid \n\t" 89 "unsupported: \n\t" 90 "movl %%edx, %1 \n\t" 91 "movl %2, %%ebx \n\t" 92 : "=m" (ebx), "=m" (edx) 93 : "m" (ebx) 94 : "eax", "ecx", "edx" ); 95 96 flags = edx; 97 } 98 99 return( flags & feature ); 100 } 101 102 /* 103 * PadLock AES-ECB block en(de)cryption 104 */ 105 int mbedtls_padlock_xcryptecb( mbedtls_aes_context *ctx, 106 int mode, 107 const unsigned char input[16], 108 unsigned char output[16] ) 109 { 110 int ebx = 0; 111 uint32_t *rk; 112 uint32_t *blk; 113 uint32_t *ctrl; 114 unsigned char buf[256]; 115 116 rk = ctx->rk; 117 blk = MBEDTLS_PADLOCK_ALIGN16( buf ); 118 memcpy( blk, input, 16 ); 119 120 ctrl = blk + 4; 121 *ctrl = 0x80 | ctx->nr | ( ( ctx->nr + ( mode^1 ) - 10 ) << 9 ); 122 123 asm( "pushfl \n\t" 124 "popfl \n\t" 125 "movl %%ebx, %0 \n\t" 126 "movl $1, %%ecx \n\t" 127 "movl %2, %%edx \n\t" 128 "movl %3, %%ebx \n\t" 129 "movl %4, %%esi \n\t" 130 "movl %4, %%edi \n\t" 131 ".byte 0xf3,0x0f,0xa7,0xc8 \n\t" 132 "movl %1, %%ebx \n\t" 133 : "=m" (ebx) 134 : "m" (ebx), "m" (ctrl), "m" (rk), "m" (blk) 135 : "memory", "ecx", "edx", "esi", "edi" ); 136 137 memcpy( output, blk, 16 ); 138 139 return( 0 ); 140 } 141 142 /* 143 * PadLock AES-CBC buffer en(de)cryption 144 */ 145 int mbedtls_padlock_xcryptcbc( mbedtls_aes_context *ctx, 146 int mode, 147 size_t length, 148 unsigned char iv[16], 149 const unsigned char *input, 150 unsigned char *output ) 151 { 152 int ebx = 0; 153 size_t count; 154 uint32_t *rk; 155 uint32_t *iw; 156 uint32_t *ctrl; 157 unsigned char buf[256]; 158 159 if( ( (long) input & 15 ) != 0 || 160 ( (long) output & 15 ) != 0 ) 161 return( MBEDTLS_ERR_PADLOCK_DATA_MISALIGNED ); 162 163 rk = ctx->rk; 164 iw = MBEDTLS_PADLOCK_ALIGN16( buf ); 165 memcpy( iw, iv, 16 ); 166 167 ctrl = iw + 4; 168 *ctrl = 0x80 | ctx->nr | ( ( ctx->nr + ( mode ^ 1 ) - 10 ) << 9 ); 169 170 count = ( length + 15 ) >> 4; 171 172 asm( "pushfl \n\t" 173 "popfl \n\t" 174 "movl %%ebx, %0 \n\t" 175 "movl %2, %%ecx \n\t" 176 "movl %3, %%edx \n\t" 177 "movl %4, %%ebx \n\t" 178 "movl %5, %%esi \n\t" 179 "movl %6, %%edi \n\t" 180 "movl %7, %%eax \n\t" 181 ".byte 0xf3,0x0f,0xa7,0xd0 \n\t" 182 "movl %1, %%ebx \n\t" 183 : "=m" (ebx) 184 : "m" (ebx), "m" (count), "m" (ctrl), 185 "m" (rk), "m" (input), "m" (output), "m" (iw) 186 : "memory", "eax", "ecx", "edx", "esi", "edi" ); 187 188 memcpy( iv, iw, 16 ); 189 190 return( 0 ); 191 } 192 193 #endif /* MBEDTLS_HAVE_X86 */ 194 195 #endif /* MBEDTLS_PADLOCK_C */ 196