Convert a byte array to a word array and back in CryptoJS-compatible fashion

CryptoJS_byteArrayConversions.js

/**
 * EXAMPLE 
 *   var myhash = CryptoJS.HmacSHA1(mine[2], secret);
 *   myhash = byteArrayConversion(myhash);
 */
function wordArrayToByteArray(hash){
	return hash.words
		//map each word to an array of bytes
		.map(function(v){
			// create an array of 4 bytes (less if sigBytes says we have run out)
			var bytes = [0,0,0,0].slice(0,Math.min(4,hash.sigBytes))
				// grab that section of the 4 byte word
				.map(function(d,i){ return (v >>> (8*i)) % 256; })
				// flip that
				.reverse()
				;
			// remove the bytes we've processed 
			// from the bytes we need to process
			hash.sigBytes -= bytes.length;
			return bytes;
		})
		// concatinate all the arrays of bytes
		.reduce(function(a,d){ return a.concat(d);},[])
		// convert the 'bytes' to 'characters'
		.map(function(d){return String.fromCharCode(d);})
		// create a single block of memory
		.join('')
		;
}