#include <libcanlock-3/canlock.h>
int cl_clear_secret(void *sec, size_t sec_size,
size_t buf_size);
The cl_clear_secret() function tries to overwrite sec_size bytes of memory starting at the address specified by the sec parameter.
The size buf_size must be set to the size of the whole buffer.
The C standard provides memset_explicit() since C23.
It is preferred, if available.
The C standard provides memset_s() since C11 in the optional Annex K.
It is called with both length values, if available.
Otherwise nonportable functions like NetBSD explicit_memset() are
used, if available.
If nothing better is available, a call to memset() is used instead.
Note that the compiler may translate this attempt to NOP.
A positive value is returned as warning in this case.
Upon successful completion zero is returned.
Negative values indicate an error.
Positive values indicate a warning.
The value -1 is returned if the parameter sec is NULL or if sec_size is greater than buf_size.
The value 1 indicates missing support for explicit memory access from the operating system.
RFC 5537, RFC 6234, RFC 8315