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(3) 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
DH_get_ex_new_index(3), DSA_get_ex_new_index(3), RSA_get_ex_new_index(3)
HISTORY
CRYPTO_set_ex_data() and
CRYPTO_get_ex_data() have been available since
SSLeay 0.9.0.