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Update docs for MBEDTLS_PLATFORM_ZEROIZE_ALT in config.h

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Andres Amaya Garcia 2018-04-17 10:21:45 -05:00
parent 3ea559ea6c
commit c58787f507
1 changed files with 16 additions and 15 deletions
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31
include/mbedtls/config.h
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@ -2853,25 +2853,26 @@
#define MBEDTLS_TLS_DEFAULT_ALLOW_SHA1_IN_KEY_EXCHANGE
/**
* \def MBEDTLS_UTILS_ZEROIZE_ALT
* \def MBEDTLS_PLATFORM_ZEROIZE_ALT
*
* Uncomment the macro to let mbed TLS use your alternate implementation of
* mbedtls_zeroize(). This replaces the default implementation in utils.c.
* mbedtls_platform_zeroize(). This replaces the default implementation in
* platform_util.c.
*
* mbedtls_zeroize() is a widely used function across the library to zero a
* block of memory. The implementation is expected to be secure in the sense
* that it has been written to prevent the compiler from removing calls to
* mbedtls_zeroize() as part of redundant code elimination optimizations.
* However, it is difficult to guarantee that calls to mbedtls_zeroize() will
* not be optimized by the compiler as older versions of the C language
* standards do not provide a secure implementation of memset(). Therefore,
* MBEDTLS_UTILS_ZEROIZE_ALT enables users to configure their own
* implementation of mbedtls_zeroize(), for example by using directives
* specific to their compiler, features from the C standard (e.g using
* memset_s() in C11) or calling a secure memset() from their system (e.g
* explicit_bzero() in BSD).
* mbedtls_platform_zeroize() is a widely used function across the library to
* zero a block of memory. The implementation is expected to be secure in the
* sense that it has been written to prevent the compiler from removing calls
* to mbedtls_platform_zeroize() as part of redundant code elimination
* optimizations. However, it is difficult to guarantee that calls to
* mbedtls_platform_zeroize() will not be optimized by the compiler as older
* versions of the C language standards do not provide a secure implementation
* of memset(). Therefore, MBEDTLS_PLATFORM_ZEROIZE_ALT enables users to
* configure their own implementation of mbedtls_platform_zeroize(), for
* example by using directives specific to their compiler, features from the C
* standard (e.g using memset_s() in C11) or calling a secure memset() from
* their system (e.g explicit_bzero() in BSD).
*/
//#define MBEDTLS_UTILS_ZEROIZE_ALT
//#define MBEDTLS_PLATFORM_ZEROIZE_ALT
/* \} name SECTION: Customisation configuration options */