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CRYPTO_set_ex_data(3) OpenSSL CRYPTO_set_ex_data(3) NAME CRYPTO_set_ex_data, CRYPTO_get_ex_data - internal application specific data functions LIBRARY libcrypto, -lcrypto 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 new_func(), free_func() and dup_func() callbacks: as passed to RSA_get_ex_new_index() for example. CRYPTO_set_ex_data() is used to set application specific data, the data is supplied in the arg parameter and its precise meaning is up to the application. CRYPTO_get_ex_data() 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 CRYPTO_set_ex_data() call. RETURN VALUES CRYPTO_set_ex_data() returns 1 on success or 0 on failure. CRYPTO_get_ex_data() 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. 1.0.1n 2009-07-19 CRYPTO_set_ex_data(3)