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CRYPTO_set_ex_data(3)               OpenSSL              CRYPTO_set_ex_data(3)

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.

1.0.2k                            2017-01-26             CRYPTO_set_ex_data(3)