Example of taking data from an iOS accelerometer and using it to seed OpenSSL's RAND.

gistfile1.m

- (void)seedFromAcceleration:(UIAcceleration *)accel {
  UIAccelerationValue value = accel.x;
	RAND_add(&value, sizeof(value), sizeof(value));
	value = accel.y;
	RAND_add(&value, sizeof(value), sizeof(value));
	value = accel.z;
	RAND_add(&value, sizeof(value), sizeof(value));
	
	NSTimeInterval interval = accel.timestamp;
	RAND_add(&interval, sizeof(interval), sizeof(interval));
}