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Introduce platform-layer functions for reading/writing seed from NV

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Introduces mbedtls_nv_seed_read() and mbedtls_nv_seed_write().

The platform-layer functions are only available when
MBEDTLS_ENTROPY_NV_SEED is enabled.
This commit is contained in:
Paul Bakker 2016-06-01 11:25:44 +01:00 • committed by Simon Butcher
parent d2e7ff746d
commit cf0a9f96c5
4 changed files with 198 additions and 3 deletions
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25
include/mbedtls/config.h
View file

@ -156,6 +156,7 @@
//#define MBEDTLS_PLATFORM_FPRINTF_ALT
//#define MBEDTLS_PLATFORM_PRINTF_ALT
//#define MBEDTLS_PLATFORM_SNPRINTF_ALT
//#define MBEDTLS_PLATFORM_NV_SEED_ALT
/**
* \def MBEDTLS_DEPRECATED_WARNING
@ -824,6 +825,25 @@
*/
//#define MBEDTLS_ENTROPY_FORCE_SHA256
/**
* \def MBEDTLS_ENTROPY_NV_SEED
*
* Enable the non-volatile (NV) seed file-based entropy source.
* (Also enables the NV seed read/write functions in the platform layer)
*
* This is crucial (if not required) on systems that do not have a
* cryptographic entropy source (in hardware or kernel) available.
*
* Requires: MBEDTLS_ENTROPY_C, MBEDTLS_PLATFORM_C
*
* Note: If you use the default implementation functions that read a seedfile
* with regular fopen(), please make sure you make a seedfile with the
* proper name (defined in MBEDTLS_PLATFORM_STD_NV_SEED_FILE) and at
* least MBEDTLS_ENTROPY_BLOCK_SIZE bytes in size that can be read from
* and written to or you will get an entropy source error!
*/
//#define MBEDTLS_ENTROPY_NV_SEED
/**
* \def MBEDTLS_MEMORY_DEBUG
*
@ -2498,6 +2518,9 @@
//#define MBEDTLS_PLATFORM_STD_SNPRINTF snprintf /**< Default snprintf to use, can be undefined */
//#define MBEDTLS_PLATFORM_STD_EXIT_SUCCESS 0 /**< Default exit value to use, can be undefined */
//#define MBEDTLS_PLATFORM_STD_EXIT_FAILURE 1 /**< Default exit value to use, can be undefined */
//#define MBEDTLS_PLATFORM_STD_NV_SEED_READ mbedtls_platform_std_nv_seed_read /**< Default nv_seed_read function to use, can be undefined */
//#define MBEDTLS_PLATFORM_STD_NV_SEED_WRITE mbedtls_platform_std_nv_seed_write /**< Default nv_seed_write function to use, can be undefined */
//#define MBEDTLS_PLATFORM_STD_NV_SEED_FILE "seedfile" /**< Seed file to read/write with default implementation */
/* To Use Function Macros MBEDTLS_PLATFORM_C must be enabled */
/* MBEDTLS_PLATFORM_XXX_MACRO and MBEDTLS_PLATFORM_XXX_ALT cannot both be defined */
@ -2510,6 +2533,8 @@
//#define MBEDTLS_PLATFORM_PRINTF_MACRO printf /**< Default printf macro to use, can be undefined */
/* Note: your snprintf must correclty zero-terminate the buffer! */
//#define MBEDTLS_PLATFORM_SNPRINTF_MACRO snprintf /**< Default snprintf macro to use, can be undefined */
//#define MBEDTLS_PLATFORM_NV_SEED_READ_MACRO mbedtls_platform_std_nv_seed_read /**< Default nv_seed_read function to use, can be undefined */
//#define MBEDTLS_PLATFORM_NV_SEED_WRITE_MACRO mbedtls_platform_std_nv_seed_write /**< Default nv_seed_write function to use, can be undefined */
/* SSL Cache options */
//#define MBEDTLS_SSL_CACHE_DEFAULT_TIMEOUT 86400 /**< 1 day */