5 CRYPTO_set_ex_data, CRYPTO_get_ex_data - internal application specific data functions
9 int CRYPTO_set_ex_data(CRYPTO_EX_DATA *r, int idx, void *arg);
11 void *CRYPTO_get_ex_data(CRYPTO_EX_DATA *r, int idx);
15 Several OpenSSL structures can have application specific data attached to them.
16 These functions are used internally by OpenSSL to manipulate application
17 specific data attached to a specific structure.
19 These functions should only be used by applications to manipulate
20 B<CRYPTO_EX_DATA> structures passed to the B<new_func()>, B<free_func()> and
21 B<dup_func()> callbacks: as passed to B<RSA_get_ex_new_index()> for example.
23 B<CRYPTO_set_ex_data()> is used to set application specific data, the data is
24 supplied in the B<arg> parameter and its precise meaning is up to the
27 B<CRYPTO_get_ex_data()> is used to retrieve application specific data. The data
28 is returned to the application, this will be the same value as supplied to
29 a previous B<CRYPTO_set_ex_data()> call.
33 B<CRYPTO_set_ex_data()> returns 1 on success or 0 on failure.
35 B<CRYPTO_get_ex_data()> returns the application data or 0 on failure. 0 may also
36 be valid application data but currently it can only fail if given an invalid B<idx>
39 On failure an error code can be obtained from L<ERR_get_error(3)|ERR_get_error(3)>.
43 L<RSA_get_ex_new_index(3)|RSA_get_ex_new_index(3)>,
44 L<DSA_get_ex_new_index(3)|DSA_get_ex_new_index(3)>,
45 L<DH_get_ex_new_index(3)|DH_get_ex_new_index(3)>
49 CRYPTO_set_ex_data() and CRYPTO_get_ex_data() have been available since SSLeay 0.9.0.