NAME¶
CRYPTO_set_ex_data, CRYPTO_get_ex_data - internal application specific data
functions
SYNOPSIS¶
#include <openssl/crypto.h>
int CRYPTO_set_ex_data(CRYPTO_EX_DATA *r, int idx, void *arg);
void *CRYPTO_get_ex_data(CRYPTO_EX_DATA *r, int idx);
DESCRIPTION¶
Several OpenSSL structures can have application specific data attached to them.
These functions are used internally by OpenSSL to manipulate application
specific data attached to a specific structure.
These functions should only be used by applications to manipulate
CRYPTO_EX_DATA structures passed to the
new_func(),
free_func() and
dup_func() callbacks: as passed to
RSA_get_ex_new_index() for example.
CRYPTO_set_ex_data() is used to set application
specific data, the data is supplied in the
arg parameter and its
precise meaning is up to the application.
CRYPTO_get_ex_data() is used to retrieve application
specific data. The data is returned to the application, this will be the same
value as supplied to a previous
CRYPTO_set_ex_data() call.
RETURN VALUES¶
CRYPTO_set_ex_data() returns 1 on success or 0 on
failure.
CRYPTO_get_ex_data() returns the application data or
0 on failure. 0 may also be valid application data but currently it can only
fail if given an invalid
idx parameter.
On failure an error code can be obtained from
ERR_get_error(3).
SEE ALSO¶
RSA_get_ex_new_index(3),
DSA_get_ex_new_index(3),
DH_get_ex_new_index(3)
HISTORY¶
CRYPTO_set_ex_data() and
CRYPTO_get_ex_data() have been available
since SSLeay 0.9.0.