Differential D544 Diff 1501 random/random-csprng.c

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random/random-csprng.c

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	/* --- Stuff pertaining to the random daemon support. --- */
	#ifdef USE_RANDOM_DAEMON

	/* If ALLOW_DAEMON is true, the module will try to use the random
	daemon first. If the daemon has failed, this variable is set to
	back to false and the code continues as normal. Note, we don't
	test this flag in a locked state because a wrong value does not
	harm and the trhead will find out itself that the daemon does not
	work and set it (again) to false. */
	static int allow_daemon;

	/* During initialization, the user may set a non-default socket name
	for accessing the random daemon. If this value is NULL, the
	default name will be used. */
	static char *daemon_socket_name;

	#endif /USE_RANDOM_DAEMON/



	/* --- Prototypes --- */	/* --- Prototypes --- */
	static void read_pool (byte *buffer, size_t length, int level );	static void read_pool (byte *buffer, size_t length, int level );
	static void add_randomness (const void *buffer, size_t length,	static void add_randomness (const void *buffer, size_t length,
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	}	}


	void
	_gcry_rngcsprng_set_daemon_socket (const char *socketname)
	{
	#ifdef USE_RANDOM_DAEMON
	if (daemon_socket_name)
	BUG ();

	daemon_socket_name = gcry_xstrdup (socketname);
	#else /!USE_RANDOM_DAEMON/
	(void)socketname;
	#endif /!USE_RANDOM_DAEMON/
	}

	/* With ONOFF set to 1, enable the use of the daemon. With ONOFF set
	to 0, disable the use of the daemon. With ONOF set to -1, return
	whether the daemon has been enabled. */
	int
	_gcry_rngcsprng_use_daemon (int onoff)
	{
	#ifdef USE_RANDOM_DAEMON
	int last;

	/* This is not really thread safe. However it is expected that this
	function is being called during initialization and at that point
	we are for other reasons not really thread safe. We do not want
	to lock it because we might eventually decide that this function
	may even be called prior to gcry_check_version. */
	last = allow_daemon;
	if (onoff != -1)
	allow_daemon = onoff;

	return last;
	#else /!USE_RANDOM_DAEMON/
	(void)onoff;
	return 0;
	#endif /!USE_RANDOM_DAEMON/
	}


	/* This function returns true if no real RNG is available or the	/* This function returns true if no real RNG is available or the
	quality of the RNG has been degraded for test purposes. */	quality of the RNG has been degraded for test purposes. */
	int	int
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	/* Make sure the level is okay. */	/* Make sure the level is okay. */
	level &= 3;	level &= 3;

	#ifdef USE_RANDOM_DAEMON
	if (allow_daemon
	&& !_gcry_daemon_randomize (daemon_socket_name, buffer, length, level))
	return; /* The daemon succeeded. */
	allow_daemon = 0; /* Daemon failed - switch off. */
	#endif /USE_RANDOM_DAEMON/

	/* Acquire the pool lock. */	/* Acquire the pool lock. */
	lock_pool ();	lock_pool ();

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