code: function gamma1_64(x)
  	{
  		var rotr19 = rotr_64(x, 19), rotr61 = rotr_64(x, 61),
  			shr6 = shr_64(x, 6);
  
  		return new Int_64(
  				rotr19.highOrder ^ rotr61.highOrder ^ shr6.highOrder,
  				rotr19.lowOrder ^ rotr61.lowOrder ^ shr6.lowOrder
  			);
  	}
docs: The 64-bit implementation of the NIST specified Gamma1 function
  
  @private
  @param {Int_64} x The 64-bit integer argument
  @return {Int_64} The NIST specified output of the function