import BN from 'bn.js';
import { ec as EC } from 'elliptic';
import ECCKey from './ecc_key';
import ElGamal, { Point } from './elgamal';

export default class XmlKey {
  private _sharedPoint: ECCKey;
  public sharedKeyX: BN;
  public sharedKeyY: BN;
  public _shared_key_x_bytes: Uint8Array;
  public aesIv: Uint8Array;
  public aesKey: Uint8Array;

  constructor() {
    this._sharedPoint = ECCKey.generate();
    this.sharedKeyX = this._sharedPoint.keyPair.getPublic().getX();
    this.sharedKeyY = this._sharedPoint.keyPair.getPublic().getY();
    this._shared_key_x_bytes = ElGamal.toBytes(this.sharedKeyX);
    this.aesIv = this._shared_key_x_bytes.subarray(0, 16);
    this.aesKey = this._shared_key_x_bytes.subarray(16, 32);
  }

  getPoint(curve: EC): Point {
    return curve.curve.point(this.sharedKeyX, this.sharedKeyY);
  }
}

// Make it more undetectable (not working right now)
// import { randomBytes } from 'crypto'
// export default class XmlKey {
//     public aesIv: Uint8Array
//     public aesKey: Uint8Array
//     public bytes: Uint8Array

//     constructor() {
//         this.aesIv = randomBytes(16)
//         this.aesKey = randomBytes(16)
//         this.bytes = new Uint8Array([...this.aesIv, ...this.aesKey])

//         console.log('XML key (AES/CBC)')
//         console.log('iv:', Buffer.from(this.aesIv).toString('hex'))
//         console.log('key:', Buffer.from(this.aesKey).toString('hex'))
//         console.log('bytes:', this.bytes)
//     }
// }