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var crypto = require('crypto')
  , rrange = 4294967296;

/**
 * Return an integer, pseudo-random number in the range [0, 2^32).
 */

var nextInt = function() {
  return crypto.randomBytes(4).readUInt32BE(0);
};

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- (CGImageRef)createMaskFromAlphaChannel:(UIImage *)image
{
	size_t width = image.size.width;
	size_t height = image.size.height; 

	NSMutableData *data = [NSMutableData dataWithLength:width*height];

	CGContextRef context = CGBitmapContextCreate(
		[data mutableBytes], width, height, 8, width, NULL, kCGImageAlphaOnly);