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 "mbedtls/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 */ 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 */ 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 */ 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