NAME

RAND_DRBG_set_ex_data, RAND_DRBG_get_ex_data, RAND_DRBG_get_ex_new_index - store and retrieve extra data from the DRBG instance

SYNOPSIS

 #include <openssl/rand_drbg.h>

 int RAND_DRBG_set_ex_data(RAND_DRBG *drbg, int idx, void *data);

 void *RAND_DRBG_get_ex_data(const RAND_DRBG *drbg, int idx);

 int RAND_DRBG_get_ex_new_index(long argl, void *argp,
                                CRYPTO_EX_new *new_func,
                                CRYPTO_EX_dup *dup_func,
                                CRYPTO_EX_free *free_func);

DESCRIPTION

RAND_DRBG_set_ex_data() enables an application to store arbitrary application specific data data in a RAND_DRBG instance drbg. The index idx should be a value previously returned from a call to RAND_DRBG_get_ex_new_index().

RAND_DRBG_get_ex_data() retrieves application specific data previously stored in an RAND_DRBG instance drbg. The idx value should be the same as that used when originally storing the data.

For more detailed information see CRYPTO_get_ex_data(3) and CRYPTO_set_ex_data(3) which implement these functions and CRYPTO_get_ex_new_index(3) for generating a unique index.

RETURN VALUES

RAND_DRBG_set_ex_data() returns 1 for success or 0 for failure.

RAND_DRBG_get_ex_data() returns the previously stored value or NULL on failure. NULL may also be a valid value.

NOTES

RAND_DRBG_get_ex_new_index(...) is implemented as a macro and equivalent to CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DRBG,...).

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