1 /* 2 * VIA PadLock support functions 3 * 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved 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 * This file is part of mbed TLS (https://tls.mbed.org) 47 */ 48 /* 49 * This implementation is based on the VIA PadLock Programming Guide: 50 * 51 * http://www.via.com.tw/en/downloads/whitepapers/initiatives/padlock/ 52 * programming_guide.pdf 53 */ 54 55 #if !defined(MBEDTLS_CONFIG_FILE) 56 #include "mbedtls/config.h" 57 #else 58 #include MBEDTLS_CONFIG_FILE 59 #endif 60 61 #if defined(MBEDTLS_PADLOCK_C) 62 63 #include "mbedtls/padlock.h" 64 65 #include <string.h> 66 67 #ifndef asm 68 #define asm __asm 69 #endif 70 71 #if defined(MBEDTLS_HAVE_X86) 72 73 /* 74 * PadLock detection routine 75 */ 76 int mbedtls_padlock_has_support( int feature ) 77 { 78 static int flags = -1; 79 int ebx = 0, edx = 0; 80 81 if( flags == -1 ) 82 { 83 asm( "movl %%ebx, %0 \n\t" 84 "movl $0xC0000000, %%eax \n\t" 85 "cpuid \n\t" 86 "cmpl $0xC0000001, %%eax \n\t" 87 "movl $0, %%edx \n\t" 88 "jb unsupported \n\t" 89 "movl $0xC0000001, %%eax \n\t" 90 "cpuid \n\t" 91 "unsupported: \n\t" 92 "movl %%edx, %1 \n\t" 93 "movl %2, %%ebx \n\t" 94 : "=m" (ebx), "=m" (edx) 95 : "m" (ebx) 96 : "eax", "ecx", "edx" ); 97 98 flags = edx; 99 } 100 101 return( flags & feature ); 102 } 103 104 /* 105 * PadLock AES-ECB block en(de)cryption 106 */ 107 int mbedtls_padlock_xcryptecb( mbedtls_aes_context *ctx, 108 int mode, 109 const unsigned char input[16], 110 unsigned char output[16] ) 111 { 112 int ebx = 0; 113 uint32_t *rk; 114 uint32_t *blk; 115 uint32_t *ctrl; 116 unsigned char buf[256]; 117 118 rk = ctx->rk; 119 blk = MBEDTLS_PADLOCK_ALIGN16( buf ); 120 memcpy( blk, input, 16 ); 121 122 ctrl = blk + 4; 123 *ctrl = 0x80 | ctx->nr | ( ( ctx->nr + ( mode^1 ) - 10 ) << 9 ); 124 125 asm( "pushfl \n\t" 126 "popfl \n\t" 127 "movl %%ebx, %0 \n\t" 128 "movl $1, %%ecx \n\t" 129 "movl %2, %%edx \n\t" 130 "movl %3, %%ebx \n\t" 131 "movl %4, %%esi \n\t" 132 "movl %4, %%edi \n\t" 133 ".byte 0xf3,0x0f,0xa7,0xc8 \n\t" 134 "movl %1, %%ebx \n\t" 135 : "=m" (ebx) 136 : "m" (ebx), "m" (ctrl), "m" (rk), "m" (blk) 137 : "memory", "ecx", "edx", "esi", "edi" ); 138 139 memcpy( output, blk, 16 ); 140 141 return( 0 ); 142 } 143 144 /* 145 * PadLock AES-CBC buffer en(de)cryption 146 */ 147 int mbedtls_padlock_xcryptcbc( mbedtls_aes_context *ctx, 148 int mode, 149 size_t length, 150 unsigned char iv[16], 151 const unsigned char *input, 152 unsigned char *output ) 153 { 154 int ebx = 0; 155 size_t count; 156 uint32_t *rk; 157 uint32_t *iw; 158 uint32_t *ctrl; 159 unsigned char buf[256]; 160 161 if( ( (long) input & 15 ) != 0 || 162 ( (long) output & 15 ) != 0 ) 163 return( MBEDTLS_ERR_PADLOCK_DATA_MISALIGNED ); 164 165 rk = ctx->rk; 166 iw = MBEDTLS_PADLOCK_ALIGN16( buf ); 167 memcpy( iw, iv, 16 ); 168 169 ctrl = iw + 4; 170 *ctrl = 0x80 | ctx->nr | ( ( ctx->nr + ( mode ^ 1 ) - 10 ) << 9 ); 171 172 count = ( length + 15 ) >> 4; 173 174 asm( "pushfl \n\t" 175 "popfl \n\t" 176 "movl %%ebx, %0 \n\t" 177 "movl %2, %%ecx \n\t" 178 "movl %3, %%edx \n\t" 179 "movl %4, %%ebx \n\t" 180 "movl %5, %%esi \n\t" 181 "movl %6, %%edi \n\t" 182 "movl %7, %%eax \n\t" 183 ".byte 0xf3,0x0f,0xa7,0xd0 \n\t" 184 "movl %1, %%ebx \n\t" 185 : "=m" (ebx) 186 : "m" (ebx), "m" (count), "m" (ctrl), 187 "m" (rk), "m" (input), "m" (output), "m" (iw) 188 : "memory", "eax", "ecx", "edx", "esi", "edi" ); 189 190 memcpy( iv, iw, 16 ); 191 192 return( 0 ); 193 } 194 195 #endif /* MBEDTLS_HAVE_X86 */ 196 197 #endif /* MBEDTLS_PADLOCK_C */ 198