gnutls_hkdf_expand(3) gnutls gnutls_hkdf_expand(3)

gnutls_hkdf_expand - API function

#include <gnutls/crypto.h>

int gnutls_hkdf_expand(gnutls_mac_algorithm_t mac, const gnutls_datum_t * key, const gnutls_datum_t * info, void * output, size_t length);

the mac algorithm used internally
the pseudorandom key created with HKDF-Extract
the optional informational data
the output value of the expand operation
the desired length of the output key

This function will derive a variable length keying material from the pseudorandom key using the HKDF-Expand function as defined in RFC 5869.

Zero or a negative error code on error.


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3.8.5 gnutls