Function compute_hmac

common/sphinx.c:263–274

Convenience function: s2/s2len can be NULL/0 if unwanted */

/* Convenience function: s2/s2len can be NULL/0 if unwanted */
static void compute_hmac(const struct secret *key,
			 const u8 *s1, size_t s1len,
			 const u8 *s2, size_t s2len,
			 struct hmac *hmac)
{
	crypto_auth_hmacsha256_state state;

	hmac_start(&state, key->data, sizeof(key->data));
	hmac_update(&state, s1, s1len);
	hmac_update(&state, s2, s2len);
	hmac_done(&state, hmac);
}

static void compute_packet_hmac(const struct onionpacket *packet,
				const u8 *assocdata, const size_t assocdatalen,