platform_util.c File Reference

#include "config.h"
#include "platform_util.h"
#include "platform.h"
#include "threading.h"
#include <stddef.h>
#include <string.h>

Include dependency graph for platform_util.c:

Macros
#define	_POSIX_C_SOURCE   200112L

Functions
void	mbedtls_platform_zeroize (void *buf, size_t len)
	Securely zeroize a buffer. More...

Macro Definition Documentation

_POSIX_C_SOURCE

#define _POSIX_C_SOURCE   200112L

Function Documentation

mbedtls_platform_zeroize()

void mbedtls_platform_zeroize	(	void *	buf,
		size_t	len
	)

Securely zeroize a buffer.

         The function is meant to wipe the data contained in a buffer so
         that it can no longer be recovered even if the program memory
         is later compromised. Call this function on sensitive data
         stored on the stack before returning from a function, and on
         sensitive data stored on the heap before freeing the heap
         object.

         It is extremely difficult to guarantee that calls to
         mbedtls_platform_zeroize() are not removed by aggressive
         compiler optimizations in a portable way. For this reason, Mbed
         TLS provides the configuration option
         MBEDTLS_PLATFORM_ZEROIZE_ALT, which allows users to configure
         mbedtls_platform_zeroize() to use a suitable implementation for
         their platform and needs

Parameters

buf	Buffer to be zeroized
len	Length of the buffer in bytes