Function subkey_from_hmac

common/hmac.c:37–45

}

void subkey_from_hmac(const char *prefix,
		      const struct secret *base,
		      struct secret *key)
{
	struct hmac h;
	hmac(base->data, sizeof(base->data), prefix, strlen(prefix), &h);
	BUILD_ASSERT(sizeof(h.bytes) == sizeof(key->data));
	memcpy(key->data, h.bytes, sizeof(key->data));
}

void towire_hmac(u8 **pptr, const struct hmac *hmac)
{