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Edit File : index.js \| Size : 1.79 KB
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),bytes2)+unstupid(this.P.getY().toBigInteger().toString(16),bytes2); // 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),bytes2),"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),bytes2),"hex"); } } } Back

Edit File : index.js | Size : 1.79 KB

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");
   }     
  }
}

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