mirror of
https://github.com/musix-org/musix-oss
synced 2024-11-14 16:00:17 +00:00
59 lines
1.8 KiB
JavaScript
59 lines
1.8 KiB
JavaScript
|
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");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|