code: function ch_64(x, y, z)
  	{
  		return new Int_64(
  				(x.highOrder & y.highOrder) ^ (~x.highOrder & z.highOrder),
  				(x.lowOrder & y.lowOrder) ^ (~x.lowOrder & z.lowOrder)
  			);
  	}
docs: The 64-bit implementation of the NIST specified Ch function
  
  @private
  @param {Int_64} x The first 64-bit integer argument
  @param {Int_64} y The second 64-bit integer argument
  @param {Int_64} z The third 64-bit integer argument
  @return {Int_64} The NIST specified output of the function