2 * Platform abstraction layer
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4 * Copyright (C) 2006-2016, ARM Limited, All Rights Reserved
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5 * SPDX-License-Identifier: Apache-2.0
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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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11 * http://www.apache.org/licenses/LICENSE-2.0
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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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19 * This file is part of mbed TLS (https://tls.mbed.org)
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22 #if !defined(MBEDTLS_CONFIG_FILE)
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23 #include "mbedtls/config.h"
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25 #include MBEDTLS_CONFIG_FILE
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28 #if defined(MBEDTLS_PLATFORM_C)
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30 #include "mbedtls/platform.h"
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31 #include "mbedtls/platform_util.h"
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33 /* The compile time configuration of memory allocation via the macros
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34 * MBEDTLS_PLATFORM_{FREE/CALLOC}_MACRO takes precedence over the runtime
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35 * configuration via mbedtls_platform_set_calloc_free(). So, omit everything
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36 * related to the latter if MBEDTLS_PLATFORM_{FREE/CALLOC}_MACRO are defined. */
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37 #if defined(MBEDTLS_PLATFORM_MEMORY) && \
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38 !( defined(MBEDTLS_PLATFORM_CALLOC_MACRO) && \
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39 defined(MBEDTLS_PLATFORM_FREE_MACRO) )
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41 #if !defined(MBEDTLS_PLATFORM_STD_CALLOC)
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42 static void *platform_calloc_uninit( size_t n, size_t size )
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49 #define MBEDTLS_PLATFORM_STD_CALLOC platform_calloc_uninit
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50 #endif /* !MBEDTLS_PLATFORM_STD_CALLOC */
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52 #if !defined(MBEDTLS_PLATFORM_STD_FREE)
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53 static void platform_free_uninit( void *ptr )
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58 #define MBEDTLS_PLATFORM_STD_FREE platform_free_uninit
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59 #endif /* !MBEDTLS_PLATFORM_STD_FREE */
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61 static void * (*mbedtls_calloc_func)( size_t, size_t ) = MBEDTLS_PLATFORM_STD_CALLOC;
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62 static void (*mbedtls_free_func)( void * ) = MBEDTLS_PLATFORM_STD_FREE;
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64 void * mbedtls_calloc( size_t nmemb, size_t size )
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66 return (*mbedtls_calloc_func)( nmemb, size );
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69 void mbedtls_free( void * ptr )
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71 (*mbedtls_free_func)( ptr );
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74 int mbedtls_platform_set_calloc_free( void * (*calloc_func)( size_t, size_t ),
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75 void (*free_func)( void * ) )
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77 mbedtls_calloc_func = calloc_func;
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78 mbedtls_free_func = free_func;
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81 #endif /* MBEDTLS_PLATFORM_MEMORY &&
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82 !( defined(MBEDTLS_PLATFORM_CALLOC_MACRO) &&
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83 defined(MBEDTLS_PLATFORM_FREE_MACRO) ) */
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85 #if defined(MBEDTLS_PLATFORM_HAS_NON_CONFORMING_SNPRINTF)
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87 int mbedtls_platform_win32_snprintf( char *s, size_t n, const char *fmt, ... )
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92 va_start( argp, fmt );
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93 ret = mbedtls_vsnprintf( s, n, fmt, argp );
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100 #if defined(MBEDTLS_PLATFORM_SNPRINTF_ALT)
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101 #if !defined(MBEDTLS_PLATFORM_STD_SNPRINTF)
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103 * Make dummy function to prevent NULL pointer dereferences
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105 static int platform_snprintf_uninit( char * s, size_t n,
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106 const char * format, ... )
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114 #define MBEDTLS_PLATFORM_STD_SNPRINTF platform_snprintf_uninit
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115 #endif /* !MBEDTLS_PLATFORM_STD_SNPRINTF */
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117 int (*mbedtls_snprintf)( char * s, size_t n,
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118 const char * format,
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119 ... ) = MBEDTLS_PLATFORM_STD_SNPRINTF;
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121 int mbedtls_platform_set_snprintf( int (*snprintf_func)( char * s, size_t n,
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122 const char * format,
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125 mbedtls_snprintf = snprintf_func;
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128 #endif /* MBEDTLS_PLATFORM_SNPRINTF_ALT */
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130 #if defined(MBEDTLS_PLATFORM_HAS_NON_CONFORMING_VSNPRINTF)
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131 #include <stdarg.h>
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132 int mbedtls_platform_win32_vsnprintf( char *s, size_t n, const char *fmt, va_list arg )
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136 /* Avoid calling the invalid parameter handler by checking ourselves */
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137 if( s == NULL || n == 0 || fmt == NULL )
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140 #if defined(_TRUNCATE)
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141 ret = vsnprintf_s( s, n, _TRUNCATE, fmt, arg );
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143 ret = vsnprintf( s, n, fmt, arg );
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144 if( ret < 0 || (size_t) ret == n )
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155 #if defined(MBEDTLS_PLATFORM_VSNPRINTF_ALT)
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156 #if !defined(MBEDTLS_PLATFORM_STD_VSNPRINTF)
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158 * Make dummy function to prevent NULL pointer dereferences
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160 static int platform_vsnprintf_uninit( char * s, size_t n,
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161 const char * format, va_list arg )
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170 #define MBEDTLS_PLATFORM_STD_VSNPRINTF platform_vsnprintf_uninit
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171 #endif /* !MBEDTLS_PLATFORM_STD_VSNPRINTF */
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173 int (*mbedtls_vsnprintf)( char * s, size_t n,
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174 const char * format,
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175 va_list arg ) = MBEDTLS_PLATFORM_STD_VSNPRINTF;
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177 int mbedtls_platform_set_vsnprintf( int (*vsnprintf_func)( char * s, size_t n,
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178 const char * format,
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181 mbedtls_vsnprintf = vsnprintf_func;
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184 #endif /* MBEDTLS_PLATFORM_VSNPRINTF_ALT */
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186 #if defined(MBEDTLS_PLATFORM_PRINTF_ALT)
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187 #if !defined(MBEDTLS_PLATFORM_STD_PRINTF)
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189 * Make dummy function to prevent NULL pointer dereferences
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191 static int platform_printf_uninit( const char *format, ... )
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197 #define MBEDTLS_PLATFORM_STD_PRINTF platform_printf_uninit
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198 #endif /* !MBEDTLS_PLATFORM_STD_PRINTF */
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200 int (*mbedtls_printf)( const char *, ... ) = MBEDTLS_PLATFORM_STD_PRINTF;
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202 int mbedtls_platform_set_printf( int (*printf_func)( const char *, ... ) )
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204 mbedtls_printf = printf_func;
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207 #endif /* MBEDTLS_PLATFORM_PRINTF_ALT */
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209 #if defined(MBEDTLS_PLATFORM_FPRINTF_ALT)
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210 #if !defined(MBEDTLS_PLATFORM_STD_FPRINTF)
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212 * Make dummy function to prevent NULL pointer dereferences
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214 static int platform_fprintf_uninit( FILE *stream, const char *format, ... )
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221 #define MBEDTLS_PLATFORM_STD_FPRINTF platform_fprintf_uninit
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222 #endif /* !MBEDTLS_PLATFORM_STD_FPRINTF */
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224 int (*mbedtls_fprintf)( FILE *, const char *, ... ) =
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225 MBEDTLS_PLATFORM_STD_FPRINTF;
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227 int mbedtls_platform_set_fprintf( int (*fprintf_func)( FILE *, const char *, ... ) )
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229 mbedtls_fprintf = fprintf_func;
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232 #endif /* MBEDTLS_PLATFORM_FPRINTF_ALT */
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234 #if defined(MBEDTLS_PLATFORM_EXIT_ALT)
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235 #if !defined(MBEDTLS_PLATFORM_STD_EXIT)
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237 * Make dummy function to prevent NULL pointer dereferences
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239 static void platform_exit_uninit( int status )
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244 #define MBEDTLS_PLATFORM_STD_EXIT platform_exit_uninit
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245 #endif /* !MBEDTLS_PLATFORM_STD_EXIT */
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247 void (*mbedtls_exit)( int status ) = MBEDTLS_PLATFORM_STD_EXIT;
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249 int mbedtls_platform_set_exit( void (*exit_func)( int status ) )
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251 mbedtls_exit = exit_func;
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254 #endif /* MBEDTLS_PLATFORM_EXIT_ALT */
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256 #if defined(MBEDTLS_HAVE_TIME)
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258 #if defined(MBEDTLS_PLATFORM_TIME_ALT)
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259 #if !defined(MBEDTLS_PLATFORM_STD_TIME)
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261 * Make dummy function to prevent NULL pointer dereferences
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263 static mbedtls_time_t platform_time_uninit( mbedtls_time_t* timer )
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269 #define MBEDTLS_PLATFORM_STD_TIME platform_time_uninit
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270 #endif /* !MBEDTLS_PLATFORM_STD_TIME */
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272 mbedtls_time_t (*mbedtls_time)( mbedtls_time_t* timer ) = MBEDTLS_PLATFORM_STD_TIME;
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274 int mbedtls_platform_set_time( mbedtls_time_t (*time_func)( mbedtls_time_t* timer ) )
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276 mbedtls_time = time_func;
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279 #endif /* MBEDTLS_PLATFORM_TIME_ALT */
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281 #endif /* MBEDTLS_HAVE_TIME */
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283 #if defined(MBEDTLS_ENTROPY_NV_SEED)
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284 #if !defined(MBEDTLS_PLATFORM_NO_STD_FUNCTIONS) && defined(MBEDTLS_FS_IO)
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285 /* Default implementations for the platform independent seed functions use
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286 * standard libc file functions to read from and write to a pre-defined filename
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288 int mbedtls_platform_std_nv_seed_read( unsigned char *buf, size_t buf_len )
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293 if( ( file = fopen( MBEDTLS_PLATFORM_STD_NV_SEED_FILE, "rb" ) ) == NULL )
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296 if( ( n = fread( buf, 1, buf_len, file ) ) != buf_len )
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299 mbedtls_platform_zeroize( buf, buf_len );
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307 int mbedtls_platform_std_nv_seed_write( unsigned char *buf, size_t buf_len )
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312 if( ( file = fopen( MBEDTLS_PLATFORM_STD_NV_SEED_FILE, "w" ) ) == NULL )
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315 if( ( n = fwrite( buf, 1, buf_len, file ) ) != buf_len )
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324 #endif /* MBEDTLS_PLATFORM_NO_STD_FUNCTIONS */
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326 #if defined(MBEDTLS_PLATFORM_NV_SEED_ALT)
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327 #if !defined(MBEDTLS_PLATFORM_STD_NV_SEED_READ)
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329 * Make dummy function to prevent NULL pointer dereferences
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331 static int platform_nv_seed_read_uninit( unsigned char *buf, size_t buf_len )
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338 #define MBEDTLS_PLATFORM_STD_NV_SEED_READ platform_nv_seed_read_uninit
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339 #endif /* !MBEDTLS_PLATFORM_STD_NV_SEED_READ */
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341 #if !defined(MBEDTLS_PLATFORM_STD_NV_SEED_WRITE)
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343 * Make dummy function to prevent NULL pointer dereferences
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345 static int platform_nv_seed_write_uninit( unsigned char *buf, size_t buf_len )
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352 #define MBEDTLS_PLATFORM_STD_NV_SEED_WRITE platform_nv_seed_write_uninit
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353 #endif /* !MBEDTLS_PLATFORM_STD_NV_SEED_WRITE */
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355 int (*mbedtls_nv_seed_read)( unsigned char *buf, size_t buf_len ) =
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356 MBEDTLS_PLATFORM_STD_NV_SEED_READ;
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357 int (*mbedtls_nv_seed_write)( unsigned char *buf, size_t buf_len ) =
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358 MBEDTLS_PLATFORM_STD_NV_SEED_WRITE;
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360 int mbedtls_platform_set_nv_seed(
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361 int (*nv_seed_read_func)( unsigned char *buf, size_t buf_len ),
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362 int (*nv_seed_write_func)( unsigned char *buf, size_t buf_len ) )
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364 mbedtls_nv_seed_read = nv_seed_read_func;
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365 mbedtls_nv_seed_write = nv_seed_write_func;
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368 #endif /* MBEDTLS_PLATFORM_NV_SEED_ALT */
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369 #endif /* MBEDTLS_ENTROPY_NV_SEED */
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371 #if !defined(MBEDTLS_PLATFORM_SETUP_TEARDOWN_ALT)
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373 * Placeholder platform setup that does nothing by default
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375 int mbedtls_platform_setup( mbedtls_platform_context *ctx )
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383 * Placeholder platform teardown that does nothing by default
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385 void mbedtls_platform_teardown( mbedtls_platform_context *ctx )
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389 #endif /* MBEDTLS_PLATFORM_SETUP_TEARDOWN_ALT */
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391 #endif /* MBEDTLS_PLATFORM_C */
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