[398] | 1 | /*
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| 2 | * VIA PadLock support functions
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| 3 | *
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| 4 | * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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| 5 | * SPDX-License-Identifier: Apache-2.0
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| 6 | *
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| 7 | * Licensed under the Apache License, Version 2.0 (the "License"); you may
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| 8 | * not use this file except in compliance with the License.
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| 9 | * You may obtain a copy of the License at
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| 10 | *
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| 11 | * http://www.apache.org/licenses/LICENSE-2.0
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| 12 | *
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| 13 | * Unless required by applicable law or agreed to in writing, software
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| 14 | * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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| 15 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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| 16 | * See the License for the specific language governing permissions and
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| 17 | * limitations under the License.
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| 18 | *
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| 19 | * This file is part of mbed TLS (https://tls.mbed.org)
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| 20 | */
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| 21 | /*
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| 22 | * This implementation is based on the VIA PadLock Programming Guide:
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| 23 | *
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| 24 | * http://www.via.com.tw/en/downloads/whitepapers/initiatives/padlock/
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| 25 | * programming_guide.pdf
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| 26 | */
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| 27 |
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| 28 | #if !defined(MBEDTLS_CONFIG_FILE)
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| 29 | #include "mbedtls/config.h"
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| 30 | #else
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| 31 | #include MBEDTLS_CONFIG_FILE
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| 32 | #endif
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| 33 |
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| 34 | #if defined(MBEDTLS_PADLOCK_C)
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| 35 |
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| 36 | #include "mbedtls/padlock.h"
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| 37 |
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| 38 | #include <string.h>
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| 39 |
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| 40 | #ifndef asm
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| 41 | #define asm __asm
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| 42 | #endif
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| 43 |
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| 44 | #if defined(MBEDTLS_HAVE_X86)
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| 45 |
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| 46 | /*
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| 47 | * PadLock detection routine
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| 48 | */
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| 49 | int mbedtls_padlock_has_support( int feature )
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| 50 | {
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| 51 | static int flags = -1;
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| 52 | int ebx = 0, edx = 0;
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| 53 |
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| 54 | if( flags == -1 )
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| 55 | {
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| 56 | asm( "movl %%ebx, %0 \n\t"
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| 57 | "movl $0xC0000000, %%eax \n\t"
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| 58 | "cpuid \n\t"
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| 59 | "cmpl $0xC0000001, %%eax \n\t"
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| 60 | "movl $0, %%edx \n\t"
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| 61 | "jb unsupported \n\t"
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| 62 | "movl $0xC0000001, %%eax \n\t"
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| 63 | "cpuid \n\t"
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| 64 | "unsupported: \n\t"
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| 65 | "movl %%edx, %1 \n\t"
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| 66 | "movl %2, %%ebx \n\t"
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| 67 | : "=m" (ebx), "=m" (edx)
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| 68 | : "m" (ebx)
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| 69 | : "eax", "ecx", "edx" );
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| 70 |
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| 71 | flags = edx;
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| 72 | }
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| 73 |
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| 74 | return( flags & feature );
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| 75 | }
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| 76 |
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| 77 | /*
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| 78 | * PadLock AES-ECB block en(de)cryption
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| 79 | */
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| 80 | int mbedtls_padlock_xcryptecb( mbedtls_aes_context *ctx,
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| 81 | int mode,
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| 82 | const unsigned char input[16],
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| 83 | unsigned char output[16] )
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| 84 | {
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| 85 | int ebx = 0;
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| 86 | uint32_t *rk;
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| 87 | uint32_t *blk;
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| 88 | uint32_t *ctrl;
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| 89 | unsigned char buf[256];
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| 90 |
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| 91 | rk = ctx->rk;
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| 92 | blk = MBEDTLS_PADLOCK_ALIGN16( buf );
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| 93 | memcpy( blk, input, 16 );
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| 94 |
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| 95 | ctrl = blk + 4;
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| 96 | *ctrl = 0x80 | ctx->nr | ( ( ctx->nr + ( mode^1 ) - 10 ) << 9 );
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| 97 |
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| 98 | asm( "pushfl \n\t"
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| 99 | "popfl \n\t"
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| 100 | "movl %%ebx, %0 \n\t"
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| 101 | "movl $1, %%ecx \n\t"
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| 102 | "movl %2, %%edx \n\t"
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| 103 | "movl %3, %%ebx \n\t"
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| 104 | "movl %4, %%esi \n\t"
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| 105 | "movl %4, %%edi \n\t"
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| 106 | ".byte 0xf3,0x0f,0xa7,0xc8 \n\t"
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| 107 | "movl %1, %%ebx \n\t"
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| 108 | : "=m" (ebx)
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| 109 | : "m" (ebx), "m" (ctrl), "m" (rk), "m" (blk)
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| 110 | : "memory", "ecx", "edx", "esi", "edi" );
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| 111 |
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| 112 | memcpy( output, blk, 16 );
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| 113 |
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| 114 | return( 0 );
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| 115 | }
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| 116 |
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| 117 | /*
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| 118 | * PadLock AES-CBC buffer en(de)cryption
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| 119 | */
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| 120 | int mbedtls_padlock_xcryptcbc( mbedtls_aes_context *ctx,
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| 121 | int mode,
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| 122 | size_t length,
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| 123 | unsigned char iv[16],
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| 124 | const unsigned char *input,
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| 125 | unsigned char *output )
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| 126 | {
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| 127 | int ebx = 0;
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| 128 | size_t count;
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| 129 | uint32_t *rk;
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| 130 | uint32_t *iw;
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| 131 | uint32_t *ctrl;
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| 132 | unsigned char buf[256];
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| 133 |
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| 134 | if( ( (long) input & 15 ) != 0 ||
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| 135 | ( (long) output & 15 ) != 0 )
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| 136 | return( MBEDTLS_ERR_PADLOCK_DATA_MISALIGNED );
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| 137 |
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| 138 | rk = ctx->rk;
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| 139 | iw = MBEDTLS_PADLOCK_ALIGN16( buf );
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| 140 | memcpy( iw, iv, 16 );
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| 141 |
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| 142 | ctrl = iw + 4;
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| 143 | *ctrl = 0x80 | ctx->nr | ( ( ctx->nr + ( mode ^ 1 ) - 10 ) << 9 );
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| 144 |
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| 145 | count = ( length + 15 ) >> 4;
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| 146 |
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| 147 | asm( "pushfl \n\t"
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| 148 | "popfl \n\t"
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| 149 | "movl %%ebx, %0 \n\t"
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| 150 | "movl %2, %%ecx \n\t"
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| 151 | "movl %3, %%edx \n\t"
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| 152 | "movl %4, %%ebx \n\t"
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| 153 | "movl %5, %%esi \n\t"
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| 154 | "movl %6, %%edi \n\t"
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| 155 | "movl %7, %%eax \n\t"
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| 156 | ".byte 0xf3,0x0f,0xa7,0xd0 \n\t"
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| 157 | "movl %1, %%ebx \n\t"
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| 158 | : "=m" (ebx)
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| 159 | : "m" (ebx), "m" (count), "m" (ctrl),
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| 160 | "m" (rk), "m" (input), "m" (output), "m" (iw)
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| 161 | : "memory", "eax", "ecx", "edx", "esi", "edi" );
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| 162 |
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| 163 | memcpy( iv, iw, 16 );
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| 164 |
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| 165 | return( 0 );
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| 166 | }
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| 167 |
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| 168 | #endif /* MBEDTLS_HAVE_X86 */
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| 169 |
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| 170 | #endif /* MBEDTLS_PADLOCK_C */
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