5 CRYPTO_set_ex_data, CRYPTO_get_ex_data - internal application specific data functions
9 #include <openssl/crypto.h>
11 int CRYPTO_set_ex_data(CRYPTO_EX_DATA *r, int idx, void *arg);
13 void *CRYPTO_get_ex_data(CRYPTO_EX_DATA *r, int idx);
17 Several OpenSSL structures can have application specific data attached to them.
18 These functions are used internally by OpenSSL to manipulate application
19 specific data attached to a specific structure.
21 These functions should only be used by applications to manipulate
22 B<CRYPTO_EX_DATA> structures passed to the new_func(), free_func() and
23 dup_func() callbacks: as passed to RSA_get_ex_new_index() for example.
25 CRYPTO_set_ex_data() is used to set application specific data, the data is
26 supplied in the B<arg> parameter and its precise meaning is up to the
29 CRYPTO_get_ex_data() is used to retrieve application specific data. The data
30 is returned to the application, this will be the same value as supplied to
31 a previous CRYPTO_set_ex_data() call.
35 CRYPTO_set_ex_data() returns 1 on success or 0 on failure.
37 CRYPTO_get_ex_data() returns the application data or 0 on failure. 0 may also
38 be valid application data but currently it can only fail if given an invalid B<idx>
41 On failure an error code can be obtained from L<ERR_get_error(3)>.
45 L<RSA_get_ex_new_index(3)>,
46 L<DSA_get_ex_new_index(3)>,
47 L<DH_get_ex_new_index(3)>