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CRYPTO_set_ex_data(3)               OpenSSL              CRYPTO_set_ex_data(3)


CRYPTO_set_ex_data, CRYPTO_get_ex_data - internal application specific data functions


#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);


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. 1.0.2h 2016-05-03 CRYPTO_set_ex_data(3)

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