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");
 }     
}

}