dynatrace-cordova-outsystems-plugin/node_modules/ecc-jsbn/index.js

This plugin gives you the ability to use the Dynatrace instrumentation in your hybrid application (Cordova, Ionic, ..). It uses the Mobile Agent, the JavaScript Agent and the Javascript Bridge. The Mobile Agent will give you all device specific values con

var crypto = require("crypto");
var BigInteger = require("jsbn").BigInteger;
var ECPointFp = require("./lib/ec.js").ECPointFp;
var Buffer = require("safer-buffer").Buffer;
exports.ECCurves = require("./lib/sec.js");

// zero prepad
function unstupid(hex,len)
{
	return (hex.length >= len) ? hex : unstupid("0"+hex,len);
}

exports.ECKey = function(curve, key, isPublic)
{
  var priv;
	var c = curve();
	var n = c.getN();
  var bytes = Math.floor(n.bitLength()/8);

  if(key)
  {
    if(isPublic)
    {
      var curve = c.getCurve();
//      var x = key.slice(1,bytes+1); // skip the 04 for uncompressed format
//      var y = key.slice(bytes+1);
//      this.P = new ECPointFp(curve,
//        curve.fromBigInteger(new BigInteger(x.toString("hex"), 16)),
//        curve.fromBigInteger(new BigInteger(y.toString("hex"), 16)));      
      this.P = curve.decodePointHex(key.toString("hex"));
    }else{
      if(key.length != bytes) return false;
      priv = new BigInteger(key.toString("hex"), 16);      
    }
  }else{
    var n1 = n.subtract(BigInteger.ONE);
    var r = new BigInteger(crypto.randomBytes(n.bitLength()));
    priv = r.mod(n1).add(BigInteger.ONE);
    this.P = c.getG().multiply(priv);
  }
  if(this.P)
  {
//  var pubhex = unstupid(this.P.getX().toBigInteger().toString(16),bytes*2)+unstupid(this.P.getY().toBigInteger().toString(16),bytes*2);
//  this.PublicKey = Buffer.from("04"+pubhex,"hex");
    this.PublicKey = Buffer.from(c.getCurve().encodeCompressedPointHex(this.P),"hex");
  }
  if(priv)
  {
    this.PrivateKey = Buffer.from(unstupid(priv.toString(16),bytes*2),"hex");
    this.deriveSharedSecret = function(key)
    {
      if(!key || !key.P) return false;
      var S = key.P.multiply(priv);
      return Buffer.from(unstupid(S.getX().toBigInteger().toString(16),bytes*2),"hex");
   }     
  }
}