code: function sigma1_64(x)
  	{
  		var rotr14 = rotr_64(x, 14), rotr18 = rotr_64(x, 18),
  			rotr41 = rotr_64(x, 41);
  
  		return new Int_64(
  				rotr14.highOrder ^ rotr18.highOrder ^ rotr41.highOrder,
  				rotr14.lowOrder ^ rotr18.lowOrder ^ rotr41.lowOrder);
  	}
docs: The 64-bit implementation of the NIST specified Sigma1 function
  
  @private
  @param {Int_64} x The 64-bit integer argument
  @return {Int_64} The NIST specified output of the function