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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