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- 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");
- 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();
- 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)
- {
- 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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