CRYPTO_set_ex_data(3ssl)
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 nneeww__ffuunncc(()), ffrreeee__ffuunncc(()) and
dduupp__ffuunncc(()) callbacks: as passed to RRSSAA__ggeett__eexx__nneeww__iinnddeexx(()) for example.
CCRRYYPPTTOO__sseett__eexx__ddaattaa(()) is used to set application specific data, the data
is supplied in the arg parameter and its precise meaning is up to the
application.
CCRRYYPPTTOO__ggeett__eexx__ddaattaa(()) 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 CCRRYYPPTTOO__sseett__eexx__ddaattaa(()) call.
RETURN VALUES
CCRRYYPPTTOO__sseett__eexx__ddaattaa(()) returns 1 on success or 0 on failure.
CCRRYYPPTTOO__ggeett__eexx__ddaattaa(()) 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.