OpenSC API Reference
sc_get_challenge
3
opensc
sc_get_challenge
Request a challenge from a card
Synopsis
#include <opensc.h>
int sc_get_challenge(struct sc_card *card, unsigned char *rnd, size_t len);
Description
This function requests a challenge (i.e. random bytes) from
card. The returned data will be stored in
rnd, and will be len bytes long.
Return value
Returns 0 if successful, or a negative value in case of error.