libkeccak_hmac_set_key3
Changes key for a the hmac-hashing state
Usage
#include <libkeccak.h> int libkeccak_hmac_set_key(struct libkeccak_hmac_state *state, const void *key, size_t key_length);
Link with -lkeccak.
Overview
The libkeccak_hmac_set_key() function sets the key for a HMAC-hashing state without reseting the state of the underlaying hashing-algorithm. key_length is the length of the key in bits.
Return values
The libkeccak_hmac_set_key() function returns 0 successful completion. On error -1 is returned and errno is set to describe the error.
Errors
The libkeccak_hmac_set_key() function may fail for any specified for the function realloc(3).