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            #include <openssl/rsa.h>
            int RSA_get_ex_new_index(long argl, void *argp,
                           CRYPTO_EX_new *new_func,
                           CRYPTO_EX_dup *dup_func,
                           CRYPTO_EX_free *free_func);
            int RSA_set_ex_data(RSA *r, int idx, void *arg);
            void *RSA_get_ex_data(RSA *r, int idx);
            typedef int CRYPTO_EX_new(void *parent, void *ptr, CRYPTO_EX_DATA *ad,
                                      int idx, long argl, void *argp);
            typedef void CRYPTO_EX_free(void *parent, void *ptr, CRYPTO_EX_DATA *ad,
                                        int idx, long argl, void *argp);
            typedef int CRYPTO_EX_dup(CRYPTO_EX_DATA *to, CRYPTO_EX_DATA *from, void *from_d,
                                      int idx, long argl, void *argp);


           Several OpenSSL structures can have application specific data attached
           to them.  This has several potential uses, it can be used to cache data
           associated with a structure (for example the hash of some part of the
           structure) or some additional data (for example a handle to the data in
           an external library).
           Since the application data can be anything at all it is passed and
           retrieved as a void * type.
           The RRSSAA_ggeett_eexx_nneeww_iinnddeexx(()) function is initially called to "register"
           some new application specific data. It takes three optional function
           pointers which are called when the parent structure (in this case an
           RSA structure) is initially created, when it is copied and when it is
           freed up. If any or all of these function pointer arguments are not
           used they should be set to NULL. The precise manner in which these
           function pointers are called is described in more detail below.
           RRSSAA_ggeett_eexx_nneeww_iinnddeexx(()) also takes additional long and pointer
           parameters which will be passed to the supplied functions but which
           otherwise have no special meaning. It returns an index which should be
           stored (typically in a static variable) and passed used in the idx
           parameter in the remaining functions. Each successful call to
           RRSSAA_ggeett_eexx_nneeww_iinnddeexx(()) will return an index greater than any previously
           returned, this is important because the optional functions are called
           in order of increasing index value.
           RRSSAA_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
           RRSSAA_ggeett_eexx_ddaattaa(()) is used to retrieve application specific data. The
           data is returned to the application, this will be the same value as
           CRYPTO_EX_DATA structure from the parent RSA structure: the functions
           CCRRYYPPTTOO_ggeett_eexx_ddaattaa(()) and CCRRYYPPTTOO_sseett_eexx_ddaattaa(()) can be called to
           manipulate it. The idx parameter is the index: this will be the same
           value returned by RRSSAA_ggeett_eexx_nneeww_iinnddeexx(()) when the functions were
           initially registered. Finally the argl and argp parameters are the
           values originally passed to the same corresponding parameters when
           RRSSAA_ggeett_eexx_nneeww_iinnddeexx(()) was called.
           dduupp_ffuunncc(()) is called when a structure is being copied. Pointers to the
           destination and source CRYPTO_EX_DATA structures are passed in the to
           and from parameters respectively. The from_d parameter is passed a
           pointer to the source application data when the function is called,
           when the function returns the value is copied to the destination: the
           application can thus modify the data pointed to by from_d and have
           different values in the source and destination.  The idx, argl and argp
           parameters are the same as those in nneeww_ffuunncc(()) and ffrreeee_ffuunncc(()).


           RRSSAA_ggeett_eexx_nneeww_iinnddeexx(()) returns a new index or -1 on failure (note 0 is
           a valid index value).
           RRSSAA_sseett_eexx_ddaattaa(()) returns 1 on success or 0 on failure.
           RRSSAA_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.
           nneeww_ffuunncc(()) and dduupp_ffuunncc(()) should return 0 for failure and 1 for
           On failure an error code can be obtained from ERR_get_error(3).


           dduupp_ffuunncc(()) is currently never called.
           The return value of nneeww_ffuunncc(()) is ignored.
           The nneeww_ffuunncc(()) function isn't very useful because no meaningful values
           are present in the parent RSA structure when it is called.


           rsa(3), CRYPTO_set_ex_data(3)


           RSA_get_ex_new_index(), RSA_set_ex_data() and RSA_get_ex_data() are
           available since SSLeay 0.9.0.

    1.0.1e 2013-02-11 RSA_get_ex_new_index(3)


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