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    Command:

    CRYPTO_set_ex_data

    
    
    
    

    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.
    
    
    

    RETURN VALUES

           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).
    
    
    

    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.
    
    
    

    1.0.1e 2013-02-11 CRYPTO_set_ex_data(3)

    
    
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