CRYPTO_set_ex_data man page on DigitalUNIX

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CRYPTO_set_ex_data(3)					 CRYPTO_set_ex_data(3)

       CRYPTO_set_ex_data,  CRYPTO_get_ex_data - Internal application specific
       data functions

       int CRYPTO_set_ex_data(
	       CRYPTO_EX_DATA	*r,   int   idx,    void    *arg    );	  void
	       CRYPTO_EX_DATA *r, int idx );

       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 exam‐

       The CRYPTO_set_ex_data() function is used to set	 application  specific
       data. The data is supplied in the arg parameter and its precise meaning
       is up to the application.

       The CRYPTO_get_ex_data() function is used to retrieve application  spe‐
       cific  data.  The data is returned to the application. This will be the
       same value as supplied to a previous CRYPTO_set_ex_data() call.

       The CRYPTO_set_ex_data() function returns 1 on success or 0 on failure.

       The CRYPTO_get_ex_data() function returns the application data or 0  on
       failure.	 Zero  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().

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

       Functions:	RSA_get_ex_new_index(3),      DSA_get_ex_new_index(3),


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