DES Initial Permutation

forked from mbostock's block: Mergesort IV

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<script src="cubehelix.js"></script>
<script>
//using code from d3 examples by Matt Bostock 
// 
//des encryption routines by Eugene Styer
//https://people.eku.edu/styere/Encrypt/JS-DES.html
//

Array.prototype.extend = function (other_array) {
    other_array.forEach(function(v) {this.push(v)}, this);    
}
  
var n = 64
var array = d3.range(n)
var arrays = [array,array]

var elements = d3.range(n).map(function(i) { return {value: i, indexes: []}; });

array=(RSA_initial_permutation(array))
arrays.push(array)
arrays.push(array)
  
var color = d3.scale.cubehelix()
    .domain([0, n / 2, n - 1])
    .range([d3.hsl(-40, 1, .4), d3.hsl(60, 1, 1), d3.hsl(160, 1, .4)]);

arrays.forEach(function(array, t) {
  array.forEach(function(value, i) {
    elements[value].indexes.push({time: t, index: i});
  });
});

var margin = {top: 20, right: 20, bottom: 20, left: 20},
    strokeWidth = 6,
    width = 960 - margin.left - margin.right,
    height = 700 - margin.top - margin.bottom;

var x = d3.scale.ordinal()
    .domain(d3.range(n))
    .rangePoints([0, width]);

var y = d3.scale.ordinal()
    .domain(d3.range(arrays.length))
    .rangePoints([0, height]);

var line = d3.svg.line()
    .interpolate("basis")

.x(function(d) { return x(d.index); })
    .y(function(d) { return y(d.time); });

var svg = d3.select("body").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

svg.append("g")
    .attr("class", "line")
  .selectAll("path")
    .data(elements)
  .enter().append("path")
    .style("stroke", function(d) { return color(d.value); })
    .attr("d", function(d) { return line(d.indexes); })
  .select(function() { return this.parentNode.insertBefore(this.cloneNode(false), this); })
    .attr("class", "line-halo")
    .style("stroke", null);

function interpolateLine(points) {
  var p0 = points[0],
      x0 = p0[0],
      y0 = p0[1],
      path = [p0];
  for (var i = 1, n = points.length, p1, x1, y1; i < n; ++i) {
    p1 = points[i];
    x1 = p1[0];
    y1 = p1[1];
    path.push("V", (y1) / 10, "L", x1, ",", (y1 *9) /10, "V", y1);
    x0 = x1;
    y0 = y1;
  }
  return path.join("");
}

// initial permutation (split into left/right halves )
// since DES numbers bits starting at 1, we will ignore x[0]
var IP_perm = new Array( -1,
	58, 50, 42, 34, 26, 18, 10, 2,
	60, 52, 44, 36, 28, 20, 12, 4,
	62, 54, 46, 38, 30, 22, 14, 6,
	64, 56, 48, 40, 32, 24, 16, 8,
	57, 49, 41, 33, 25, 17, 9, 1,
	59, 51, 43, 35, 27, 19, 11, 3,
	61, 53, 45, 37, 29, 21, 13, 5,
	63, 55, 47, 39, 31, 23, 15, 7 );

// copy bits in a permutation
//   dest = where to copy the bits to
//   src  = Where to copy the bits from
//   perm = The order to copy/permute the bits
// note: since DES ingores x[0], we do also
  
 function permute( dest, src, perm )
{
  var i;
  var fromloc;

for( i=1; i<perm.length; i++ )
  {
    fromloc = perm[i];
    dest[i] = src[fromloc];
  }
}

function RSA_initial_permutation(array) {
var n = array.length,
      a =[array[0]],
      array1 = new Array(n+1);

a.extend(array)

// initial permutation (split into left/right halves )
// since DES numbers bits starting at 1, we will ignore x[0]
//array1 = [
//a[58],a[50],a[42],a[34],a[26],a[18],a[10],a[2],
//a[60],a[52],a[44],a[36],a[28],a[20],a[12],a[4],
//a[62],a[54],a[46],a[38],a[30],a[22],a[14],a[6],
//a[0],a[56],a[48],a[40],a[32],a[24],a[16],a[8],
//a[57],a[49],a[41],a[33],a[25],a[17],a[9],a[1],
//a[59],a[51],a[43],a[35],a[27],a[19],a[11],a[3],
//a[61],a[53],a[45],a[37],a[29],a[21],a[13],a[5],
//a[63],a[55],a[47],a[39],a[31],a[23],a[15],a[7]]
var IP_perm = new Array( -1,
	58, 50, 42, 34, 26, 18, 10, 2,
	60, 52, 44, 36, 28, 20, 12, 4,
	62, 54, 46, 38, 30, 22, 14, 6,
	64, 56, 48, 40, 32, 24, 16, 8,
	57, 49, 41, 33, 25, 17, 9, 1,
	59, 51, 43, 35, 27, 19, 11, 3,
	61, 53, 45, 37, 29, 21, 13, 5,
	63, 55, 47, 39, 31, 23, 15, 7 );
    // handle the initial permutation
permute( array1,a, IP_perm );
//var fromloc
//  var i=0
//    for( i=0; //i<array0.length; i++ )
//    {
      //fromloc=IP_perm[i];
//    fromloc = perm[i];
//    dest[i] = src[fromloc];
//array1[i]=array0[i]
//    }
  array1.shift()
  return array1;
}

d3.select(self.frameElement).style("height", height + margin.top + margin.bottom + "px");

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