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RedHat 9 (Linux i386) - man page for crypto_get_ex_data (redhat section 3)

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
SYNOPSIS
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 manipu- late 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. 0.9.7a 2000-01-29 CRYPTO_set_ex_data(3)

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