/usr/man2/cat.3/CRYPTO_set_ex_data.3.Z(/usr/man2/cat.3/CRYPTO_set_ex_data.3.Z)

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.

       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).

       RSA_get_ex_new_index(3), DSA_get_ex_new_index(3),
       DH_get_ex_new_index(3)

       CRYPTO_set_ex_data() and CRYPTO_get_ex_data() have been available since
       SSLeay 0.9.0.

1.0.2t                            2019-09-10             CRYPTO_set_ex_data(3)
See also CRYPTO_get_ex_data(3)