kdf_hkdf_free
kdf_hkdf_free(dest);
static OSSL_FUNC_kdf_freectx_fn kdf_hkdf_free;
{ OSSL_FUNC_KDF_FREECTX, (void (*)(void))kdf_hkdf_free },
{ OSSL_FUNC_KDF_FREECTX, (void (*)(void))kdf_hkdf_free },